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SD-125

SERVICE MANUAL

Maxon Electronics Australia Pty. Ltd. 36a Gibson Ave, Padstow, NSW 2211, Australia. Phone: (61) 2 9707-2000; Fax: (61) 2 9707 -3328 October 1998

MAXON SD-125 RF LINK MODULE
TABLE OF CONTENTS
TABLE OF CONTENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . i SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 UNPACKING. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 FEATURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 THEORY OF OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 DIGITAL CIRCUITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 RF CIRCUITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 RF CIRCUITS PLL SYNTHESIZER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 RECEIVER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 MAINTENANCE AND REPAIR. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 GENERAL. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 REMOVING & REPLACING THE UPPER COVER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 REMOVING & REPLACING THE DIGITAL BOARD & SHIELD PLATE . . . . . . . . . . . . . . . 12 REMOVING & REPLACING THE RF BOARD. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 PROGRAMMING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 ALIGNMENT PROCEDURE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 RECEIVER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 TRANSMITTER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 TEST EQUIPMENT SETUP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 ALIGNMENT POINTS DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 COMPONENT REPLACEMENT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 TROUBLESHOOTING GUIDE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 VOLTAGE CHART . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 SD-125 DIGITAL BOARD (COMMON) PARTS LIST (650-010-0029) . . . . . . . . . . . . . . . . . . . . 25 SD-125 (U1 400-430MHz) RF BOARD PARTS LIST (650-020-0027) . . . . . . . . . . . . . . . . . . . . . . 27 SD-125 (U2 440-470MHz) RF BOARD PARTS LIST (650-020-0026) . . . . . . . . . . . . . . . . . . . . . . 30 SD-125 (V2 148-174MHz) RF BOARD PARTS LIST (650-020-0029) . . . . . . . . . . . . . . . . . . . . . . 33 COMPONENT PINOUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37 WIRING DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41 SCHEMATICS, BLOCK DIAGRAM & PCB's. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43 BLOCK DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43 DIGITAL BOARD SCHEMATIC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44 RF BOARD (148-174MHz) SCHEMATIC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45 RF BOARD (400-430MHz) SCHEMATIC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46 RF BOARD (440-470MHz) SCHEMATIC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47 TCXO SCHEMATIC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48 VCO (148-174MHz) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
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MAXON SD-125 RF LINK MODULE
VCO (400-430MHz) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49 VCO (440-470MHz) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49 FRONT-END (148-174MHz) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50 FRONT-END (400-430MHz) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50 FRONT-END (440-470MHz) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50 POWER AMPLIFIER (148-174MHz) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51 POWER AMPLIFIER (400-430MHz) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51 POWER AMPLIFIER (440-470MHz) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51 DIGITAL PCB ASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52 RF PCB ASSEMBLY (148-174MHz) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53 RF PCB ASSEMBLY (400-430MHz) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54 RF PCB ASSEMBLY (440-470MHz) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54 EXPLODED VIEW & PARTS LIST. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55

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MAXON SD-125 RF LINK MODULE
SPECIFICATIONS
GENERAL
Equipment Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Data radio Performance Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . TIA / EIA-603 & ETS 300-113 Band . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . UHF / VHF Channel Spacings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 kHz, 12.5 kHz programmable RF Output Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5/1 watt Modulation Type. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . F3D, F3E Intermediate Frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45.1 MHz & 455 kHz Number of Channels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 Frequency Source . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Synthesizer Operation Rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Intermittent 90 : 5 : 5 (Standby: RX: TX) Power Supply. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Ext. Power Supply(12 VDC Nominal Voltage) 9.0V - 15.0V DC EXTREME Temperature Range Storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . from - 40°C to + 80°C Operating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . from - 30°C to + 60°C Current Consumption Standby (Muted). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . < 65 mA Transmit 5 Watts RF Power . . . . . . . . . . . . . . . . . . . . . . . . . < 2.0 A Transmit 1 Watt RF power . . . . . . . . . . . . . . . . . . . . . . . . . < 1.0 A

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MAXON SD-125 RF LINK MODULE
Frequency Bands: RX VHF: V1 V2 UHF: U2 U1 U5 U3 U4 136.000 - 162.000 MHz 148.000 - 174.000 MHz 440.000 - 470.000 MHz 400.000 - 430.000 420.000 - 450.000 470.000 - 490.000 490.000 - 512.000 TX 136.000 - 162.000 MHz 148.000 - 174.000 MHz 440.000 - 470.000 MHz 400.000 - 430.000 420.000 - 450.000 470.000 - 490.000 490.000 - 512.000

Dimensions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . (30 mm)H x (62 mm)W x (118 mm)D Weight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 253 grams

TRANSMITTER
Carrier Power: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Nom. Hi . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5W Low . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1W Max < 6W < 1.5W Min > 4.5W > 0.8W

Sustained Transmission . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Nominal conditions Time: Power: 5 >90% 10 >85% 30 Sec. >80%

Frequency Error . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . < 0.5 kHz Nominal condition for VHF < 0.75 kHz Nominal condition for UHF ±3.0 ppm Extreme condition for UHF ±5.0 ppm Extreme condition for VHF Frequency Deviation: 25 kHz Channel Spacing . . . . . . . . . . . . . . . . . . . . . . . . . . . . Peak ±5.0, Min. ±3.8 12.5 kHz Channel Spacing. . . . . . . . . . . . . . . . . . . . . . . . . . . Peak ±2.5, Min. ±1.9 Audio Frequency Response . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Within +1/-3dB of 6dB octave @ 300 Hz to 2.55 kHz for 12.5 kHz C.S. @ 300 Hz to 3.0 kHz for 25 kHz C.S. Adjacent Channel Power 25 kHz . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . < 70 dBc @ Nominal Condition < 65 dBc @ Extreme Condition 12.5 kHz. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . < 60 dBc @ Nominal Condition < 55 dBc @ Extreme Condition Conducted Spurious Emission . . . . . . . . . . . . . . . . . . . . . . . . . . . . < -57 dBc

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MAXON SD-125 RF LINK MODULE
Modulation Sensitivity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100mV RMS @ 60 % Peak Dev. Hum & Noise: 25 kHz Channel Spacing . . . . . . . . . . . . . . . . . . . . . . . . . . . . > 40 dB (with no PSOPH) 12.5 kHz Channel Spacing. . . . . . . . . . . . . . . . . . . . . . . . . . . > 40 dB (with PSOPH) Modulation Symmetry . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . < 10 % Peak Dev @ 1 kHz input for nominal dev +20dB Load Stability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . No osc at ł 10:1 VSWR all phase angles and suitable antenna No destroy at ł 20:1 all phase angle Peak Deviation Range Adjustment @ 1 kHz, Nom. Dev +20dB: 25 kHz Channel Spacing . . . . . . . . . . . . . . . . . . . . . . . . . . . . Min. 3.5, 12.5 kHz Channel Spacing. . . . . . . . . . . . . . . . . . . . . . . . . . . . in. 1.5, M

Max. 6.0 Max. 4.0

RECEIVER
Sensitivity (12dB Sinad) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . UHF < -117 dBm, VHF <-118 dBm @ Nom. Condition UHF < -115 dBm, VHF <-116 dBm @ Extreme Condition Amplitude Characteristic. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . < ±3 dB Adjacent Channel Selectivity: 25 kHz Channel Spacing . . . . . . . . . . . . . . . . . . . . . . . . . . . . > 60 dB @ Nom., > 55 dB @ Extreme Condition 12.5 kHz Channel Spacing. . . . . . . . . . . . . . . . . . . . . . . . . . . > 50 dB @ Nom., > 45 dB @ Extreme Condition Spurious Response Rejection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70 dB (100 kHz - 4 GHz) Image Response. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . > 70 IF Response . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . > 70 Others. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . > 70 Intermodulation Response Rejection: ±25 kHz/ 50 kHz . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65 dB ±50 kHz/ 100 kHz . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65 dB Conducted Spurious Emission @ Nominal Conditions: 9 kHz - 1 GHz . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . < -57 dBm 1 GHz - 4 GHz. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . < -47 dBm RX Spurious Emissions (Radiated) @ Nominal Conditions 9 kHz - 1 GHz . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . < -57 dBm 1 GHz - 12.75 GHz . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . < -47 dBm

PAGE-3October 98

MAXON SD-125 RF LINK MODULE
AF Distortion. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . < 5% @ Nom., < 10 % @ Extreme condition RX Hum & Noise: 25.0 kHz CP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . < 40 dB No PSOPH 12.5 kHz CP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . < 40 dB with PSOPH Receiver Response Time. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . < 16 mS Squelch Opening Range: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . RF level for 6 to 14 dB Sinad Squelch Closing Range (Hysteresis):. . . . . . . . . . . . . . . . . . . . . . . 0 - 6 dB Sinad @ Nominal Condition Squelch Attack Time: RF Level at Threshold . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . < 40 mS RF Level at Threshold + 20 dB . . . . . . . . . . . . . . . . . . . . . . . < 30 mS Squelch Decay Time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 mS Min., 20 mS Max. Antenna Socket Input Match. . . . . . . . . . . . . . . . . . . . . . . . . . . . . > 10 dB Return Loss L.O. Frequency Temperature Stability . . . . . . . . . . . . . . . . . . . . 1st < 5 ppm, 2nd < 15 ppm from -30° to + 60° C L.O. Frequency Aging Rate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±2 ppm/ year

REFERENCE CRYSTAL
Frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12.8 MHz Holder Type. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . HC-18 Temperature Characteristic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±5.0 ppm from -30° C to +60° C Aging Rate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . < 2 ppm/ year in 1st year < 1 ppm/ year thereafter Lock Time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . < 10 mS TX to RX . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . < 20 (No Power Saving) RX to TX . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . < 20

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MAXON SD-125 RF LINK MODULE
ENVIRONMENTAL (performance without degradation unless stated)
Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . deg C Operating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -30° to +60° C Degradation Specified @ Extreme Storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -40° to +80° C Recharging. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -10° to +55° C ESD. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 kV (C-MIC ł 15 kV) Vibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . MIL STD 810 C Procedures I, II, V and IEC68 26

PROGRAMMER
Programmer (Interface Module) . . . . . . . . . . . . . . . . . . . . . . . . . . ACC-2000 Programmer (Interface Cable) . . . . . . . . . . . . . . . . . . . . . . . . . . . QPA-4000 Programmer (Software) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ACC-900

·

Due to continuing research and development the company reserves the right to alter these specifications without prior notice.

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MAXON SD-125 RF LINK MODULE

Intentionally Left Blank

PAGE-6October 98

MAXON SD-125 RF LINK MODULE
UNPACKING
The SD-125 RF Link Module is the only item included in the shipping container.

PAGE-7October 98

MAXON SD-125 RF LINK MODULE
INTRODUCTION
The Maxon SD-125 Series of RF Link Modules from Maxon utilizes the latest technology in its design and manufacturing. Both the UHF and VHF models are PLL (Phase Lock Loop Synthesizer) / microprocessor controlled, and offer one to five watts of power with 16 channel capability. Multiple functions including 1200 to 9600 baud rates, AC and/or DC audio coupling, GMSK and FSK modulation are standard in these fully programmable wide bandwidth RF Link Module units. The radio is programmed using a IBM® Personal Computer, DOS® based software, an interface module and a programming cable. This allows the radio to be tailored to meet the requirements of the individual user and of the System(s) it is operating within.

FEATURES

· · · · · ·

Busy Channel Lockout 16 Channels TX Time-out Power Save 1 / 5 Watt Programmable Output 12.5 / 25 kHz Programmable Channel Spacing

Busy Channel Lockout The Busy Channel Lockout feature, when enabled, disables the transmitter when the receiving channel is busy and the user attempts to transmit. 16 Channels The SD-125 Series radio can store up to 16 channels within the same band. TX Time-out The TX Time-out feature, when enabled, limits the amount of time that the user can continuously transmit. This time can be set in increments of 10 seconds from 10 seconds to 990 seconds. Power Save The Power Save feature is used when an external battery is used as the power source. When Power Save is enabled, the receiver "ON" and "OFF" time can be programmed into the radio and allows the operator to set the length of time the receiver is asleep.

Maxon's SD-125

.

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MAXON SD-125 RF LINK MODULE
THEORY OF OPERATION
INTRODUCTION
The VHF and UHF radios are comprised of two PCB's (an RF PCB and a digital PCB). These boards are connected with an 18 pin female and male connector . The digital board is interfaced with external data equipment through the 9 pin d-sub male connector, which controls the radio and data receiving and sending . CHANNEL SELECTOR One of 16 channels may be selected using the Dip Switch (SW401). SW401 encodes the channel number, selected into 4-bit binary code. The binary code plus one equals the channel number. The binary code is decoded by the CPU enabling the appropriate RX or TX frequency and associated data to be selected from the EEPROM. DC TO DC CONVERTER The main DC power is injected to the DC to DC converter . The DC to DC converter regulates the various input power supply voltage and outputs a constant voltage of 7.5 Volts. It is a source for all of the RF and digital circuits. The DC to DC converter is formed by U801, Q801, Q802, L801 and R804. U801 is a switch mode DC to DC Converter IC. Input DC various appears as a voltage various through R804. U801 detects the voltage and controls the switching pulse. As the switching pulses, Q801and Q802 switches the input DC of various supply voltages and generates the constant DC of supply voltage.

DIGITAL CIRCUITS
The Digital circuit contains the CPU, the channel select switch, and associated digital circuits. TX-SIGNAL CIRCUIT The TX data signal comes from Pin 2 of Con 401, and goes through U404D. The TX-signal is amplified by U406C. The TX-signal is filtered by U405A & B which is a 4'th order low pass filter, the output of U405A is then fed to the RF board for TX modulation. RX-SIGNAL CIRCUIT The RX- data signal comes from the RF board, which is connected with pin 10 of Con 403. The RX-signal is switched by U404A and adjusted by RV403 and amplified by U407. The amplified signal goes to pin10 of Con 401. RSSI DETECTOR From the RF board, the RSSI (Received Signal Strength Indicator ) signal flows to U403A & B through R461. The pulse is injected from pin 5 of U403B every 1 mS and C451 is discharged. It is then charged by R464. The RSSI signal is simultaneously input to pin 7 of U403A and those signals are compared. The compared signal is output from U403A. Pin 1 of U403A and the CPU detects the pulse width. The pulse width is varied by RSSI DC voltage, therefore, the carrier detection is controlled by the CPU. EEPROM RX / TX channel and RSSI detection level as well as other data from the programmer are stored in the EEPROM. The data stored is retained without power supplied. This is a non-volatile memory. The EEPROM may have information re-programmed or erased. U402 is an EEPROM with 2048 (8 x 256) capacity and data is written and read serially.

RF CIRCUITS
TRANSMITTER The transmitter is comprised of: 1. 2. 3. 4. 5. Buffer P.A. Module Low Pass Filter Antenna Switch A.P.C. Circuits

BUFFER VCO output level is -6dBm and amplified to +10dBm (UHF), +6dBm (VHF). The buffer consists of Q16 and Q17 for isolation and gain. P.A. MODULE The P.A. Module contains Q501, Q502, and Q503. Three stage amplifier Q501 amplifies the TX signal from +10 dBm to 100 mW. Q502 is amplified to 0.5W. Q503 amplifies to 3W and then matched to 50 Ohms using the L.C. network, thereby reducing the harmonics by -30 dB. LOW PASS FILTER L7, L8, L11, C72, C73, C74 and C75 are the 7th order Chebyshev low pass filter. Unwanted harmonics are reduced by -70 dBc.

PAGE-9October 98

MAXON SD-125 RF LINK MODULE
ANTENNA SWITCH When transmitting, the diodes D5 and D6 are forward biased enabling the RF signal passage to the antenna. D6 is shorted to ground inhibiting the RF signal to front end. In receive the diodes D5 and D6 are reversed biased passing the signal from the antenna through L13 and C83 to the front end without signal loss. AUTOMATIC CURRENT CONTROL (ACC) CIRCUITS The ACC circuit consists of R109, variable resistor RV1, IC3(B) and transistors Q21 and Q22. The supply current is monitored by the difference voltage on R109 (0.1 Ohm). If the current varies by RF power output or other reasons, it produces some bias voltage by IC3A and Q19. The differential signal at the output of IC3 is passed to Q21 and Q22 that produces a constant power output to the antenna. RV1 is used to adjust the RF power level. LEVEL SHIFTER & CHARGE PUMP The charge pump is used for changing output signals Fr, Fv at PLL IC from 0-5v to 0-12v necessary for controlling the VCO. REFERENCE FREQUENCY LPF The Loop Filter contains R12, C21 and C22. LPF settling time is 12mS with 1 kHz frequency. This also reduces the residual side-band noise for the best signal-to-noise ratio. DC TO DC CONVERTER The DC to DC converter convert the 5v to 14-16v to supply the necessary voltage for wide range frequency in the VCO. VCO The VCO consist of an RX VCO and a TX VCO. It is switched TX/RX by the power source. It is configured as a colpits oscillator and connected to the buffer as a cascade bias in order to save power. The varicap diode D201/D301 are low-resistance elements and produce a change in frequency with a change in reverse bias voltage (2-11v). L203/L303 are resonant coils, which changes the control voltage by the tuning core. D202 modulation diode, modulates the audio signal. C204 compensates for the non-linearity of the VCO due to modulation diode, and maintains a constant modulation regardless of frequency.

RF CIRCUITS PLL SYNTHESIZER
12.8 MHz TCXO The TCXO contains the 3-stage thermistor network compensation and crystal oscillator and modulation ports. Compensation is ±5 PPM or less from -30c to +60c. PLL IC DUAL MODULES PRESCALER Input frequency of 12.8 MHz to IC2 MC14519 pin 20 is divided to 6.25 kHz or 5 kHz by the reference counter, and then supplied to the comparator. RF signal input from VCO is divided to 1/64 at the prescaler in IC2, divided by A and N counter in IC2 to determine frequency steps, and then supplied to the comparator. PLL comparison frequency is 6.25/5kHz so that minimum programmable frequency step is 5/6.25 kHz. The A and N counter is programmed to obtain the desired frequency by serial data in the CPU. In the comparator, the phase difference between reference and VCO signal is compared. When the phase of the reference frequency is leading , Fv is the output, but when VCO frequency is leading, Fr is the output. When Fv=Fr, phase detector out is a very small pulse. 64/65 modulus prescaler is comprised in IC2, and has two output ports:

RECEIVER
FRONT-END The receive signal is routed backward through the low pass filter, then onward to Pin 1 of the Hybrid Receiver Front End Module to a bandpass filter consisting of (VHF C622 through C608, L607 through L604 ) and (UHF C601through C610, L601 through L603 ) is coupled to the base of Q601 which serves as an RF amplifier. Diode D601 serves as protection from static RF overload from nearby transmitters. The output of Q601 is then coupled to a second bandpass filter consisting of (VHF C607 through C623 and L604 through L607).The output of Pin 6 is then coupled to the doubly balanced mixer D9. The receiver front end module is factory pre-tuned and requires no adjustment. Repair is effected by replacement of the entire module of the proper banded module. These are VHF 148MHz to 174 MHz and UHF 440 MHz to 470 MHz. The receiver front end module signal pins are as follows: 1. RF Input 2. Input Ground 3. N/A 4. Receive +5V 5. Ground 6. Output

· ·

Port A pin 16: TX enable 2 Port B pin 15: prescaler power save control in PLL IC Pin 13 labeled test2 allows the technician to see the output of the dual modulus prescaler for trouble shooting purposes, no connection should be made to this pin.

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MAXON SD-125 RF LINK MODULE
FIRST MIXER D9, T2 and T3 are double balanced mixers which provide the 45.1 MHz intermediate frequency output. The filtered frequency from the front end module is coupled to T2 . The 45.1 MHz IF output is matched to the input of the 2-pole monolithic filter by L14, L31, C69 and C97. The crystal filter provides a bandwidth of ±7.2 kHz from the operating frequency providing a high degree of spurious and intermodulation protection. Additionally, a 90 MHz trap (XF1) is also placed at the filter output to provide additional attenuation of the second order IMD. The output of the filter is impedance matched by C97 and C69 to the base of the post of filter IF amplifier Q25. SECOND OSCILLATOR MIXER LIMITER AND FM DETECTOR The output of the post filter amplifier, Q25, is coupled via C98 to the input of IC5 ( MC3371). IC5 is a monolithic single conversion FM transceiver, containing a mixer, the second local oscillator, limiter and quadrature detector. Crystal X1 44.645 MHz is used to provide resultant 455kHz signal from the output of the second mixer. The mixer output is then routed to CF1 (455F). These ceramic filters provide the adjacent channel selectivity of 25 kHz bandwidth . RSSI ( RECEIVER SIGNAL STRENGTH INDICATOR ) The RSSI signal is output from IC5 on pin 13. As the receiver signals the output, DC voltage is varied as much as receiver signal strength. Also, the DC signal is temperature compensated with a thermistor (TH1).

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MAXON SD-125 RF LINK MODULE
MAINTENANCE AND REPAIR
GENERAL
When removing or fitting, use the Exploded View and Parts List, located on page 55 in conjunction with the following procedures:

·

WARNING: Disconnect the SD-125 from all external equipment at the D-Sub connector prior to disassembly.

REMOVING & REPLACING THE UPPER COVER
Removing the Upper Cover: 1. Unscrew the four upper cover mounting screws located on the upper cover of the radio. To replace the Upper Cover: 1. Reverse the steps taken to remove the Upper Cover. Figure 1-Upper Cover Removal

REMOVING & REPLACING THE DIGITAL BOARD & SHIELD PLATE
Removing the Digital Board Assembly & Shield Plate: 1. Remove the Upper Cover (refer to Removing & Replacing the Upper Cover). 2. Disconnect the DB9 pin connector on CON401. 3. Unscrew the 4 mounting screws. 4. Remove the Digital Board Assembly. 5. Remove the Shield Plate. To replace the Digital Board Assembly: 1. Reverse the steps taken to remove the Digital Board Assembly & Shield Plate.

Figure 2-Digital Board Assembly Removal

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MAXON SD-125 RF LINK MODULE

Figure 3-Shield Plate Removal

REMOVING & REPLACING THE RF BOARD
Removing the RF Board Assembly: 1. Remove the Upper Cover (refer to Removing & Replacing the Upper Cover). 2. Remove the Digital Board Assembly and Shield Plate (refer to Removing & Replacing the Digital Board Assembly & Shield Plate). 3. Unscrew the 4 mounting standoffs. 4. Unsolder the antenna connector cable. 5. Remove the RF Board Assembly. To replace the RF Board Assembly: 1. Reverse the steps taken to remove the RF Board Assembly. Figure 4-RF Board Removal

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MAXON SD-125 RF LINK MODULE
PROGRAMMING
The SD-125 Series radio requires the ACC-900 Programming Software, ACC-2000 Interface Module, 9-15 VDC 200mA Power Supply and QPA-4000 Programmer Interface Cable. Refer to the ACC-900 Programming Manual (P/N: 680-110-0032) for detailed information on programming the SD-125 Series radio.

ALIGNMENT PROCEDURE
The SD-125 UHF/VHF Receiver is by design, broad band covering UHF(400-430 MHz & 440-470 MHz) and VHF(148-174 MHz) and should require no special alignment, unless repairs are performed on the receiver portion. Should repairs be necessary, use the "Test Equipment Diagram" on page 17 & the "Alignment Points Diagram" on page 18, in conjunction with the following procedures:

·

An Extender Board (P/N: 650-060-0016) is required in order to separate the Digital and RF PCB's to allow access to the alignment points. Installation instructions are provided with the Extender Board Assembly.

RECEIVER
1. Apply a standard test signal to the receiver antenna terminals. 2. Adjust T1 for maximum sensitivity and audio output with minimum audio distortion. 3. Adjust RV403 for the specific audio output level. RX VCO 1. Set the unit to the highest receive frequency, 470MHz(UHF), 174MHz(VHF) and adjust the VCO L303 to 8 volts. 2. Set the unit to the lowest receive frequency 440MHz(UHF), 148(VHF) and check that the VCO voltage is above 2.0 volts. If voltage is below 2.0 volts, adjust L303 for 2.0 volts or more.

·

Note: Use TP1 to measure the voltage.

TRANSMITTER
Connect the unit to a Service Monitor with the power meter setting to the 10 W scale (or autorange) TCXO Set the channel selector to the mid-range frequency 460 MHz, adjust TCX01 for a reading of 460 MHz ±200Hz (155 MHz VHF models).

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MAXON SD-125 RF LINK MODULE
TX VCO 1. Set the unit to the highest transmit frequency, 470MHz(UHF), 174MHz(VHF) key the transmitter and adjust the VCO L203 to 8 volts. 2. Set the unit to the lowest transmit frequency 440 MHz(UHF), 148(VHF) key the transmitter and check that the VCO voltage is above 2.0 volts. If voltage is below 2.0 volts, adjust L203 for 2.0 volts or more. 1. Squelch open (unmute) at -114dBm to -113dBm (0.45 - 0.5mV of the RX signal strength) 2. Squelch close (mute) at -117dBm to -116dBm (0.3 0.35mV of the RX signal strength) Changing the default squelch settings requires use of the programming adaptor box. This box is designed for use not only as part of the programming kit but also as a tool of squelch level setting. The minimum equipment required for squelch level setting is a RF signal generator. Radio communication test equipment is recommended. 1. Power up the programming adaptor box (use the DC supply of 9 - 15 Volts 200mA). 2. Hook up the SD-125 unit to the programming adaptor box, and its antenna connector to the RF input port of the RF signal generator. 3. With the adaptor box turned "off", simultaneously press and hold both "ON/OFF" and "WRITE" buttons down. 4. Release the "ON/OFF" button first then the "WRITE" button next. (LED indicator on the box will flash twice after that it may stay on / off, this is of no concern , because depending on the signal strength of the RF generator as well as the pre-set level of squelch the SD125 may be in standby mode (LED OFF) or in receiving mode (LED ON) 5. Adjust the RF signal generator for the desired signal strength to OPEN squelch (e.g. default setting is -113dBm, that is equivalent to 0.5mV) 6. Press and release "READ" button, LED indicator will flash 3 times then it will be ON. 7. Adjust the RF signal generator for the desired signal strength to CLOSE squelch (e.g. default setting is -116dBm, that is equivalent to 0.35mV) 8. Press and release "READ" button, LED indicator will flash 1 time then it will be OFF. 9. Press and release "WRITE" button, LED indicator will flash twice. 10. Squelch level is now set. Test for desired level by increasing or decreasing the RF signal to levels set

·

Note: use TP1 to measure the voltage.

TX Deviation and Balance Adjustment 1. Set the unit to a mid-frequency and input the TX data with 400 Hz standard audio level. 2. Increase the signal level to 20 dB from standard level. 3. Monitor the demodulated signal from service monitor. Adjust RV3 to make the monitored signal to be a balanced square wave. 4. Reduce input signal to the standard level and adjust RV2 for the standard deviation. APC 1. Adjust RV1 for High Power (5W) 2. Adjust RV6 for Low Power (1W) 3. This completes the transmitter alignment procedures. SD-125 Squelch setting using the ACC-2000 Interface Module Maxon's wide range of data radio products since the crystal control module (DM-0500 series) had their squelch level setting by hardware touch up. With the new SD-125 series, the squelch level to open or close (unmute or mute) is set up by software control. The RSSI utilizes the A/D conversion that will be fed to the microprocessor, which in turn will use this input to determine the squelch level setting to control the mute and unmute of the receiver. Default setting of squelch level for all the SD-125 from our manufacture and workshop is approximately set at:

PAGE-15October 98

MAXON SD-125 RF LINK MODULE
for open and close squelch (mute LED will be OFF & unmute LED will be ON).

·

NOTE: The difference of RF signal strength between the unmute and mute levels must be greater than or at least equal to 0.15mV (i.e. at least -123.5dBm) for the squelch setting to work properly. If they are too close to one another, RSSI through the A/D conversion can not differentiate between the mute and unmute level properly. As a result, it would cause the CD (Carrier Detect) to act intermittently.

PAGE-16October 98

MAXON SD-125 RF LINK MODULE
TEST EQUIPMENT SETUP

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MAXON SD-125 RF LINK MODULE
ALIGNMENT POINTS DIAGRAM

T1

1 2 3 4

RV6 RV1

TC701

RV403 L203 L303

RV3 RV2

TP1

RF BOARD ALIGNMENT POINTS
1 CHANNEL NO.
1 2 3 4 1 2 3 4 1 2 3 4

DIGITAL BOARD ALIGNMENT POINTS
2 3 4
1 2 3 4

SWITCH POSITION 5
1 2 3 4

6
1 2 3 4

7
1 2 3 4

8
1 2 3 4

9
1 2 3 4

10
1 2 3 4

11
1 2 3 4

12
1 2 3 4

13
1 2 3 4

14
1 2 3 4

15
1 2 3 4

16
1 2 3 4

SW401 CHANNEL SELECT SWITCH
PAGE-18October 98

MAXON SD-125 RF LINK MODULE
COMPONENT REPLACEMENT
Surface Mount Components Surface mount components should always be replaced using a temperature controlled soldering system. The soldering tools may be either a temperature controlled soldering iron or a temperature controlled hot-air soldering station. A hot-air system is recommended for the removal of components on these boards. With either soldering system, a temperature of 700° F (371° C) should be maintained. The following procedures outline the removal and replacement of surface mount components. If a hot-air soldering system is employed, see the manufacturer's operating instructions for detailed information on the use of your system. surface mount component and any flux on the printed circuit board. Surface Mount Component Replacement 1. "Tin" one terminal end of the new component and the corresponding pad of the PCB. Use as little solder as possible. 2. Place the component on the PCB pads, observing proper polarity for capacitors, diodes, transistors, etc. 3. Simultaneously touch the "tinned" terminal end and the "tinned" pad with the soldering iron. Slightly press the component down on the board as the solder liquefies. Solder all terminals, allowing the component time to cool between each application of heat. Do not apply heat for an excessive length of time and do not use excessive solder. With a hot-air system, apply hot air until all "tinned" areas are melted and the component is seated in place. It may be necessary to slightly press the component down on the board. Touch up the soldered connections with a standard soldering iron if needed. Do not use excessive solder.

·

CAUTION: Avoid applying heat to the body of any surface mount component using standard soldering methods. Heat should be applied only to the metalized terminals of the components. Hot-air systems do not damage the components since the heat is quickly and evenly distributed to the external surface of the component. CAUTION: The CMOS Integrated Circuit devices used in this equipment can be destroyed by static discharges. Before handling one of these devices, service technicians should discharge themselves by touching the case of a bench test instrument that has a 3-prong power cord connected to an outlet with a known good earth ground. When soldering or desoldering a CMOS device, the soldering equipment should have a known good earth ground.

·

·

CAUTION: Some chemicals may damage the internal and external plastic parts of the radio.

4. Allow the component and the board to cool and then remove all flux from the area using alcohol or another approved flux remover. Surface Mounted Integrated Circuit Replacement Soldering and de-soldering techniques of the surface mounted IC's are similar to the above outlined procedures for the surface mounted chip components. Use extreme care and observe static precautions when removing or replacing the defective (or suspect) IC's. This will prevent any damage to the printed circuit board or the surrounding circuitry. The hot-air soldering system is the best method of replacing surface mount IC's. The IC's can easily be removed and installed using the hot-air system. See the manufacturer's instructions for complete details on tip selection and other operating instructions unique to your system. If a hot-air system is not available, the service technician may wish to clip the pins near the body of the defective IC and remove it. The pins can then be removed from the PCB with a standard soldering iron and tweezers, and the new IC installed following the Surface Mount Component Replacement procedures. it may not be necessary to "tin" all (or any) of the IC pins before the installation process.

Surface Mount Removal 1. Grip the component with tweezers or small needle nose pliers. 2. Alternately heat the metalized terminal ends of the surface mount component with the soldering iron. If a hot-air system is used, direct the heat to the terminals of the component. Use extreme care with the soldering equipment to prevent damage to the printed circuit board (PCB) and the surrounding components. 3. When the solder on all terminals is liquefied, gently remove the component. Excessive force may cause the PCB pads to separate from the board if all solder is not completely liquefied. 4. It may be necessary to remove excess solder using a vacuum de-soldering tool or Solder wick . Again, use great care when de-soldering or soldering on the printed circuit boards. It may also be necessary to remove the epoxy adhesive that was under the

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MAXON SD-125 RF LINK MODULE
TROUBLESHOOTING GUIDE
SYMPTOMS COUNTERMEASURES 1. Check CON401 connection 2. Check U801 3. IC1 (5v ±0.2v) 4. Check TCXO/VCO/PLL IC 5. Check LPF (IC407) 6. Re-programming 1. Check D5, D6 2. Check Q601 3. Check D9, T2, T3 4. Replace IC5 5. RX VCO level .2dBm 6. Re-Tune TCXO 1. Repair RX VCO 2. Defective IF IC (IC5) 3. IC1, Q1, Q3 1. Replace TCXO 1. Defective 12.8 MHz TCXO 2. Voltage source for RX VCP/TX VCO 2. Check RX VCO/TX VCO 3. Replace IC2 3. Defective PLL IC 1. APC 1. Re-adjust RV1 1. Check Q16, 17 1. TX Buffer 2. Check Q501, 502, 503 2. Power Module 3. Check Q22, D4 3. APC control 1. SW IC & Mic Amp IC 1. Check U404, 405, 406 1. Short protector VCC 1. Defective programming lead CAUSES 1. Incomplete connection 2. Defective DC/DC VCC 3. 5v voltage source 4. PLL error 5. Filtering error 6. EEPROM fail 1. Defective ANT Switch 2. Defective Front-End 3. Defective dBm 4. IF IC 5. VCO level drop 6. Change of 1st local frequency 1. VCO frequency change or level drop 2. Defective voltage source

Unit does not work

Bad RX Sensitivity (-10 to -60dB)

Defective RX

PLL Error Low TX Power No TX Power No Modulation No Programming

·

An Extender Board, P/N: 650-060-0016, is required in order to separate the Digital and RF PCB's for troubleshooting purposes.

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MAXON SD-125 RF LINK MODULE
VOLTAGE CHART

CONTROL CIRCUIT TRANSISTOR RX
REF# Q401 Q402 Q403 Q404 Q405 Q406 Q407 Q408 B 5.0 5.0 4.7 4.8 4.6 4.8 7.5 0.0 C 0.0 GND 0.0 0.0 1.8 0.0 4.0 7.5 E 5.0 5.0 5.0 GND 1.8 0.0 7.5 0.0 B 5.0 5.0 4.7 4.6 0.0 7.5 0.0

TX
C 0.0 0.0 0.0 0.0 1.8 5.0 4.0 7.5 E 5.0 5.0 5.0 GND 1.8 0.0 7.5 0.0

RF BOARD TRANSISTOR RX
REF # Q2 Q3 Q4 Q5 Q6 Q7 Q8 Q11 Q12 Q13 Q14 Q16 Q17 Q18 Q19 Q21 Q22 Q25 B 4.7 0.0 0.0 5.0 4.0 18.0 5.0 0.0 2.0 4.6 0.0 0.0 0.0 0.0 1.0 0.0 7.5 0.7 C 0.0 4.7 5.0 0.0 18.0 6.3 0.0 6.3 4.7 4.6 0.0 0.0 0.0 0.0 7.5 7.5 0.0 4.0 E 5.0 5.0 5.0 5.0 5.0 18.0 5.0 0.0 1.2 4.0 0.0 0.0 0.0 0.0 0.5 0.0 7.5 GND B 0.0 4.7 0.0 5.0 4.2 18.0 5.0 0.0 0.0 0.0 4.6 1.6 0.6 5.0 1.6 1.6 6.8 0.0

TX
C 4.7 0.0 5.0 0.0 18.0 6.3 0.0 6.3 0.0 0.0 4.6 4.8 3.0 0.2 7.5 6.6 5.0 0.0 E 5.0 5.0 5.0 5.0 5.0 18.0 5.0 0.0 0.0 0.0 4.0 0.8 GND GND 1.0 1.2 7.5 GND

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MAXON SD-125 RF LINK MODULE
RF BOARD IC'S RECEIVE MODE
PIN # 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 IC1 GND GND GND 5.0 GND 7.5 IC2 NC 5.0 5.0 5.0 5.0 NC GND NC NC AUDIO AUDIO 5.0 NC 5.0 0.0 0.0 4.6 0.0 4.7 OSC1 IC3 (OFF) IC5 OSC1 OSC2 4.7 3.3 3.3 3.3 4.7 AUDIO NC NC NC NC GND 1.8 IC7 (OFF) IC8 (OFF) -

RF BOARD IC'S TRANSMIT MODE
PIN # 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 IC1 GND GND GND 5.0 GND 7.5 IC2 NC 5.0 5.0 5.0 5.0 NC GND NC NC AUDIO AUDIO 5.0 NC 5.0 0.0 5.0 4.6 0.0 4.7 OSC1 IC3 1.6 3.0 3.0 GND 0.8 0.3 4.0 5.0 PAGE-22October 98

IC5 (OFF) -

IC7 1.8 1.8 1.8 GND 1.8 1.8 1.8 5.0 -

IC8 0.7 0.3 0.3 GND 1.88 1.88 1.88 5.0 -

MAXON SD-125 RF LINK MODULE
CONTROL CIRCUIT IC'S RECEIVE MODE
PIN # 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 PIN # 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 IC402 0.0 0.0 0.7 5.0 GND 4.7 4.7 4.7 IC401 4.63 4.63 0.0 5.0 0.0 0.0 2.0 4.6 4.6 4.6 0.0 0.0 0.0 4.6 4.7 NC GND 5.0 0.0 0.0 0.0 NC IC403 1.3 0.0 5.0 1.8 2.0 5.0 0.3 0.0 1.8 AUDIO AUDIO GND IC404 GND 0.0 GND 0.0 1.8 1.8 0.0 0.0 5.0 PIN # 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 IC405 AUDIO AUDIO 1.8 GND 1.8 AUDIO AUDIO IC401 4.7 4.7 4.7 0.0 5.0 4.6 GND 4.6 0.0 4.6 0.0 0.0 0.9 OSC2 OSC1 7.5 NC NC 4.6 4.6 GND 0.0 IC406 1.8 1.8 1.8 5.0 AUDIO 1.8 AUDIO IC407 AUDIO GND AUDIO GND AUDIO 7.5 4.0 AUDIO IC408

PAGE-23October 98

MAXON SD-125 RF LINK MODULE
CONTROL CIRCUIT IC'S TRANSMIT MODE
PIN # 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 PIN # 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 IC402 0.0 0.0 4.7 5.0 GND 4.7 4.7 4.7 IC401 0.0 0.0 4.6 5.0 0.0 0.0 4.6 4.6 4.6 0.0 0.0 0.0 4.6 0.4 0.4 NC GND 5.0 0.0 0.0 4.7 0.0 IC403 IC404 AUDIO AUDIO 0.0 GND AUDIO AUDIO 4.6 PIN # 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 IC405 AUDIO AUDIO AUDIO 5.0 AUDIO AUDIO AUDIO 1.8 1.8 1.8 GND 0.0 1.8 1.8 IC401 4.7 4.7 4.7 0.0 5.0 4.6 GND 4.6 0.0 4.6 0.0 0.0 0.0 OSC2 OSC1 4.6 NC NC 4.6 4.6 GND 0.0 IC406 1.8 1.8 1.8 5.0 AUDIO AUDIO 1.8 GND 1.8 AUDIO AUDIO IC407 IC408

PAGE-24October 98

MAXON SD-125 RF LINK MODULE
SD-125 DIGITAL BOARD (COMMON) PARTS LIST (650-010-0029)
REF # C401 C402 C403 C404 C405 C406 C407 C408 C409 C410 C411 C412 C413 C414 C415 C416 C417 C422 C423 C424 C425 C426 C427 C428 C429 C430 C431 C432 C433 C434 C435 C436 C437 C438 C439 C440 C441 C442 C443 C444 C445 C446 C447 C449 C450 C451 C452 C453 C454 C455 C456 C457 C458 C459 C460 C461 DESCRIPTION CAP, CER,1UF,+80-20%,16V,Y5V,0805 CAP, CER,0.001UF,10%,50V,X7R,0603 CAP, CER,0.022UF,10%,50V,X7R,0603 CAP, CER,0.1UF,+80-20%,25V,Y5V,0603 CAP, CER,47PF,5%,50V,COG,0603 CAP, CER,0.022UF,10%,50V,X7R,0603 CAP, CER,0.1UF,+80-20%,25V,Y5V,0603 CAP, CER,47PF,5%,50V,COG,0603 CAP, CER,0.047UF,+20-80%,25V,Y5V,0603 CAP, CER,0.0056UF,10%,50V,X7R,0603 CAP, CER,0.0027UF,5%,50V,X7R,0603 CAP, CER,0.0047UF,10%,50V,X7R,0603 CAP, CER,150PF,10%,50V,X7R,0603 CAP, CER,0.0039UF,10%,50V,X7R,0603 CAP, CER,47PF,5%,50V,COG,0603 CAP, CER,0.1UF,+80-20%,25V,Y5V,0603 CAP, CER,0.1UF,+80-20%,25V,Y5V,0603 CAP, CER,0.1UF,+80-20%,25V,Y5V,0603 CAP, CER,0.047UF,+20-80%,25V,Y5V,0603 CAP, CER,470PF,10%,50V,X7R,0603 CAP, TA,10UF,20%,6.3V,3216,A CAP, CER,0.047UF,+20-80%,25V,Y5V,0603 CAP, TA,100UF,20%,6.3V,D CAP, TA,47UF,20%,16V,7343H CAP, CER,0.001UF,10%,50V,X7R,0603 CAP, CER,0.001UF,10%,50V,X7R,0603 CAP, CER,0.001UF,10%,50V,X7R,0603 CAP, CER,0.001UF,10%,50V,X7R,0603 CAP, CER,0.001UF,10%,50V,X7R,0603 CAP, CER,0.001UF,10%,50V,X7R,0603 CAP, TA,4.7UF,20%,10V,A CAP, CER,0.1UF,+80-20%,25V,Y5V,0603 CAP, CER,39PF,5%,50V,COG,0603 CAP, CER,39PF,5%,50V,COG,0603 CAP, TA,1UF,20%,25V,3216 CAP, TA,10UF,20%,6.3V,3216,A CAP, CER,0.001UF,10%,50V,X7R,0603 CAP, CER,0.001UF,10%,50V,X7R,0603 CAP, CER,0.001UF,10%,50V,X7R,0603 CAP, CER,0.001UF,10%,50V,X7R,0603 CAP, CER,0.001UF,10%,50V,X7R,0603 CAP, CER,0.001UF,10%,50V,X7R,0603 CAP, TA, 22UF,20%,35V,7343 CAP, CER,0.001UF,10%,50V,X7R,0603 CAP, CER,0.1UF,+80-20%,25V,Y5V,0603 CAP, CER,0.01UF,10%,25V,X7R,0603 CAP, CER,0.001UF,10%,50V,X7R,0603 CAP, CER,0.1UF,+80-20%,25V,Y5V,0603 CAP, TA,4.7UF,20%,10V,A CAP, TA,4.7UF,20%,10V,A CAP, TA,4.7UF,20%,10V,A CAP, TA,4.7UF,20%,10V,A CAP, CER,47PF,5%,50V,COG,0603 CAP, CER,47PF,5%,50V,COG,0603 CAP, TA,10UF,20%,6.3V,3216,A CAP, TA,1UF,20%,25V,3216 PART # 100-803-2105 100-621-1102 100-621-1223 100-813-1104 100-520-1470 100-621-1223 100-813-1104 100-520-1470 100-813-1473 100-621-1562 100-521-1272 100-621-1472 100-621-1151 100-621-1392 100-520-1470 100-813-1104 100-813-1104 100-813-1104 100-813-1473 100-621-1471 102-013-0106 100-813-1473 102-013-3107 102-033-5476 100-621-1102 100-621-1102 100-621-1102 100-621-1102 100-621-1102 100-621-1102 102-023-0475 100-813-1104 100-520-1390 100-520-1390 102-053-0105 102-013-0106 100-621-1102 100-621-1102 100-621-1102 100-621-1102 100-621-1102 100-621-1102 102-063-3226 100-621-1102 100-813-1104 100-611-1103 100-621-1102 100-813-1104 102-023-0475 102-023-0475 102-023-0475 102-023-0475 100-520-1470 100-520-1470 102-013-0106 102-053-0105 REF # C463 C464 C465 C466 C801 C802 C803 C804 C805 C806 C807 C808 C810 C811 C812 C813 C815 CON401 CON403 D401 D402 D403 D404 D405 D406 D407 D408 D409 D410 D801 D802 L801 L802 Q401 Q402 Q403 Q404 Q405 Q406 Q407 Q408 Q801 Q802 R403 R404 R406 R407 R409 R410 R411 R412 R413 R414 R415 R416 R417 DESCRIPTION CAP, CER,0.1UF,+80-20%,25V,Y5V,0603 CAP, CER,0.1UF,+80-20%,25V,Y5V,0603 CAP, CER,0.0033UF,10%,50V,X7R,0603 CAP, CER,0.0027UF,5%,50V,X7R,0603 CAP, CER,51PF,5%,50V,COG,0603 CAP, CER,0.1UF,+80-20%,25V,Y5V,0603 CAP, CER,330PF,5%,50V,COG,0603 CAP, CER,51PF,5%,50V,COG,0603 CAP, CER,100PF,+/-5%,50V,COG,0603 CAP, CER,100PF,+/-5%,50V,COG,0603 CAP, TA, 22UF,20%,35V,7343 CAP, CER,0.1UF,+80-20%,25V,Y5V,0603 CAP, CER,0.01UF,10%,25V,X7R,0603 CAP, TA,100UF,20%,16V,E,7343 CAP, CER,100PF,+/-5%,50V,COG,0603 CAP, TA,4.7UF,20%,10V,A CAP, TA,100UF,20%,16V,E,7343 CONN,PLUG,15P,1.25MM,RT,SMT CONN, SKT,18P/DIP,2.0MMST,SMT DIODE, ZNR,Z02W5.6V-Y,5.6V,0.2W,SOT-23 DIODE, ZNR,Z02W5.6V-Y,5.6V,0.2W,SOT-23 DIODE, ZNR,Z02W5.6V-Y,5.6V,0.2W,SOT-23 DIODE, ZNR,Z02W5.6V-Y,5.6V,0.2W,SOT-23 DIODE, ZNR,Z02W5.6V-Y,5.6V,0.2W,SOT-23 DIODE, SW,KDS193,SOT-23 DIODE, ZNR,Z02W5.6V-Y,5.6V,0.2W,SOT-23 DIODE, ZNR,Z02W5.6V-Y,5.6V,0.2W,SOT-23 DIODE, ZNR,Z02W5.6V-Y,5.6V,0.2W,SOT-23 DIODE, ZNR,Z02W5.6V-Y,5.6V,0.2W,SOT-23 DIODE, SW,KDS160,6V,2PIN USC DIODE, SCHOTTKY,MBRS140T3,SMB COIL, CHIP,12UH, A814AY-120M=P3 COIL, CHIP,3.3UH, 636CY-3R3M=P3 TRANS, PNP,KRA104S,SOT-23,SW,(PD) TRANS, PNP,KRA104S,SOT-23,SW,(PD) TRANS, PNP,KRA104S,SOT-23,SW,(PD) TRANS, NPN,KRC104SND,SOT-23,SW,ND TRANS, PNP,KRA104S,SOT-23,SW,(PD) TRANS, NPN,KRC104SND,SOT-23,SW,ND TRANS, PNP,KTA1504(Y),SOT-23,SW TRANS, NPN,KRC104SND,SOT-23,SW,ND TRANS, SI4412DY,SO-8,MOSFET,N-CH TRANS, SI4412DY,SO-8,MOSFET,N-CH RES, TF,10K,5%,1/16W,+/-200,0603 RES, TF,47K,5%,1/16W,+/-200,0603 RES, TF,22K,5%,1/16W,+/-200,0603 RES, TF,10K,5%,1/16W,+/-200,0603 RES, TF,100K,5%,1/16W,+/-200,0603 RES, TF,220K,5%,1/16W,+/-200,0603 RES, TF,100K,5%,1/16W,+/-200,0603 RES, TF,3.3K,5%,1/16W,+/-200,0603 RES, TF,180K,5%,1/16W,+/-200,0603 RES, TF,100K,5%,1/16W,+/-200,0603 RES, TF,10K,5%,1/16W,+/-200,0603 RES, TF,10K,5%,1/16W,+/-200,0603 RES, TF,10K,5%,1/16W,+/-200,0603 PART # 100-813-1104 100-813-1104 100-621-1332 100-521-1272 100-520-1510 100-813-1104 100-520-1331 100-520-1510 100-520-1101 100-520-1101 102-063-3226 100-813-1104 100-611-1103 102-033-3107 100-520-1101 102-023-0475 102-033-3107 140-081-0015 140-020-0056 221-020-0056 221-020-0056 221-020-0056 221-020-0056 221-020-0056 220-010-0003 221-020-0056 221-020-0056 221-020-0056 221-020-0056 220-010-0017 220-040-0012 355-010-0120 355-010-0335 870-010-0005 870-010-0005 870-010-0005 870-020-0001 870-010-0005 870-020-0001 870-100-0004 870-020-0001 870-070-0006 870-070-0006 741-102-1103 741-102-1473 741-102-1223 741-102-1103 741-102-1104 741-102-1224 741-102-1104 741-102-1332 741-102-1184 741-102-1104 741-102-1103 741-102-1103 741-102-1103

PAGE-25October 98

MAXON SD-125 RF LINK MODULE
REF # R418 R419 R420 R421 R422 R423 R424 R425 R426 R428 R429 R430 R431 R432 R433 R434 R435 R436 R437 R438 R439 R440 R441 R442 R443 R444 R445 R446 R447 R448 R449 R450 R451 R452 R454 R455 R456 R457 R458 R460 R461 R463 R464 R465 R466 R467 R468 R469 R470 R471 R472 R473 R474 R475 R476 R477 R478 R480 R481 DESCRIPTION RES, TF,10K,5%,1/16W,+/-200,0603 RES, TF,10K,5%,1/16W,+/-200,0603 RES, TF,9.1K,5%,1/16W,+/-200,0603 RES, TF,10K,5%,1/16W,+/-200,0603 RES, TF,10K,5%,1/16W,+/-200,0603 RES, TF,1K,5%,1/16W,+/-200,0603 RES, TF,10K,5%,1/16W,+/-200,0603 RES, TF,10K,5%,1/16W,+/-200,0603 RES, TF,10K,5%,1/16W,+/-200,0603 RES, TF,10K,5%,1/16W,+/-200,0603 RES, TF,47K,5%,1/16W,+/-200,0603 RES, TF,1M,5%,1/16W,+/-200,0603 RES, TF,47K,5%,1/16W,+/-200,0603 RES, TF,47K,5%,1/16W,+/-200,0603 RES, TF,4.7K,5%,1/16W,+/-200,0603 RES, TF,4.7K,5%,1/16W,+/-200,0603 RES, TF,10K,5%,1/16W,+/-200,0603 RES, TF,4.7K,5%,1/16W,+/-200,0603 RES, TF,10K,5%,1/16W,+/-200,0603 RES, TF,2.2K,5%,1/16W,+/-200,0603 RES, TF,4.7K,5%,1/16W,+/-200,0603 RES, TF,10K,5%,1/16W,+/-200,0603 RES, TF,47K,5%,1/16W,+/-200,0603 RES, TF,47K,5%,1/16W,+/-200,0603 RES, TF,47K,5%,1/16W,+/-200,0603 RES, TF,47K,5%,1/16W,+/-200,0603 RES, TF,100K,5%,1/16W,+/-200,0603 RES, TF,100,5%,1/16W,+/-200,0603 RES, TF,10K,5%,1/16W,+/-200,0603 RES, TF,1M,5%,1/16W,+/-200,0603 RES, TF,20K,5%,1/16W,+/-200,0603 RES, TF,33K,5%,1/16W,+/-200,0603 RES, TF,100K,5%,1/16W,+/-200,0603 RES, TF,100K,5%,1/16W,+/-200,0603 RES, TF,10K,5%,1/16W,+/-200,0603 RES, TF,22K,5%,1/16W,+/-200,0603 RES, TF,470,5%,1/16W,+/-200,0603 RES, TF,22K,5%,1/16W,+/-200,0603 RES, TF,100K,5%,1/16W,+/-200,0603 RES, TF,10K,5%,1/16W,+/-200,0603 RES, TF,10K,5%,1/16W,+/-200,0603 RES, TF,1.8M,5%,1/10W,+/-200,0805 RES, TF,47K,5%,1/16W,+/-200,0603 RES, TF,10K,5%,1/16W,+/-200,0603 RES, TF,47K,5%,1/16W,+/-200,0603 RES, TF,47K,5%,1/16W,+/-200,0603 RES, TF,10K,5%,1/16W,+/-200,0603 RES, TF,100K,5%,1/16W,+/-200,0603 RES, TF,100K,5%,1/16W,+/-200,0603 RES, TF,220K,5%,1/16W,+/-200,0603 RES, TF,120K,5%,1/16W,+/-200,0603 RES., TF,68K, 5%, 1/16W,+/-200, 0603 RES, TF,100,5%,1/16W,+/-200,0603 RES, TF,100,5%,1/16W,+/-200,0603 RES, TF,100,5%,1/16W,+/-200,0603 RES, TF,100,5%,1/16W,+/-200,0603 RES, TF,10K,5%,1/16W,+/-200,0603 RES, TF,100K,5%,1/16W,+/-200,0603 RES, TF,1K,5%,1/16W,+/-200,0603 PART # 741-102-1103 741-102-1103 741-102-1912 741-102-1103 741-102-1103 741-102-1102 741-102-1103 741-102-1103 741-102-1103 741-102-1103 741-102-1473 741-102-1105 741-102-1473 741-102-1473 741-102-1472 741-102-1472 741-102-1103 741-102-1472 741-102-1103 741-102-1222 741-102-1472 741-102-1103 741-102-1473 741-102-1473 741-102-1473 741-102-1473 741-102-1104 741-102-1101 741-102-1103 741-102-1105 741-102-1203 741-102-1333 741-102-1104 741-102-1104 741-102-1103 741-102-1223 741-102-1471 741-102-1223 741-102-1104 741-102-1103 741-102-1103 741-112-2185 741-102-1473 741-102-1103 741-102-1473 741-102-1473 741-102-1103 741-102-1104 741-102-1104 741-102-1224 741-102-1124 741-102-1683 741-102-1101 741-102-1101 741-102-1101 741-102-1101 741-102-1103 741-102-1104 741-102-1102 REF # R482 R483 R484 R486 R487 R488 R489 R490 R491 R492 R493 R494 R495 R496 R801 R802 R804 R805 R806 RV402 RV403 RV404 SW401 U401 U402 U403 U404 U405 U406 U407 U408 U801 X401 DESCRIPTION RES, TF,1K,5%,1/16W,+/-200,0603 RES, TF,1K,5%,1/16W,+/-200,0603 RES, TF,1K,5%,1/16W,+/-200,0603 RES., TF,68K, 5%, 1/16W,+/-200, 0603 RES, TF,10K,5%,1/16W,+/-200,0603 RES, TF,10K,5%,1/16W,+/-200,0603 RES, TF,10K,5%,1/16W,+/-200,0603 RES, TF,10,5%,1/16W,+/-200,0603 RES, TF,56K,5%,1/16W,+/-200,0603 RES, TF,100K,5%,1/16W,+/-200,0603 RES, TF,100K,5%,1/16W,+/-200,0603 RES, TF,100K,5%,1/16W,+/-200,0603 RES, TF,100K,5%,1/16W,+/-200,0603 RES, TF,0,5%,1/8W,TC250,1206 RES, TF,10K,5%,1/16W,+/-200,0603 RES, TF,36K,5%,1/16W,+/-200,0603 RES, TF,0.033,1%,1/10W,+/-100, 0805 RES, TF,68K,1%,1/16W,+/-100,0603 RES, TF,20K,5%,1/16W,+/-200,0603 RES, TF,0, +/-5%,1/10W,+/-250,0805 POT, VRES,22K,+/-25%,TOP ADJ RES, TF,0, +/-5%,1/10W,+/-250,0805 SW, DIP8P,4 POS,KSD-04,SPST IC, CPU, OPT, MC68HC705C8FB,44-QFP IC, EEPROM,AT93C56-10SI,SO-8,2K,2-5V IC, QUAD CMPTR,LM339,SO14 IC, SW/MUX,MC14066BDR2,SO-14,A-SW IC, OP AMP,KIA324F,SO-14,QUAD IC, OP AMP,KIA324F,SO-14,QUAD IC, AUDIO AMP,LM386M-1,0.33W,SO-8 IC, V DET,KIA7042P,4.2V,SOT-89 IC, DC/DC CONV, LTC1435CS,SO-16 RESONATOR, CER,CSAC3.58MGC PART # 741-102-1102 741-102-1102 741-102-1102 741-102-1000 741-102-1683 741-102-1103 741-102-1103 741-102-1103 741-102-1100 741-102-1563 741-102-1104 741-102-1104 741-102-1104 741-102-1104 741-127-3000 741-102-1103 741-102-1363 740-112-R033 740-211-1683 741-102-1203 741-117-2000 901-120-0223 741-117-2000 830-130-0004 443-100-0010 442-010-0003 441-110-0003 444-050-0001 441-030-0002 441-030-0002 441-040-0002 441-020-0005 441-011-0005 310-020-0004

R485(LK2.10) RES, TF, 0, 5%,1/16W, +/-200,0603

PAGE-26October 98

MAXON SD-125 RF LINK MODULE
SD-125 (U1 400-430MHz) RF BOARD PARTS LIST (650-020-0027)
REF # DESCRIPTION REPLACEMENT MODULES ASSY, PCB,FRONT END,UHF,400-430MHZ ASSY, PCB,PWR AMP,UHF,400-430MHZ ASSY, PCB,TCXO ASSY, PCB,VCO TX/RX,UHF,400-430MHZ C1 C2 C3 C4 C5 C6 C7 C8 C9 C11 C12 C13 C14 C15 C16 C17 C18 C19 C21 C22 C23 C24 C25 C26 C34 C35 C36 C37 C38 C39 C41 C42 C43 C44 C45 C46 C47 C49 C50 C51 C53 C54 C55 C56 C57 C58 C59 CAP, CER,470PF,10%,50V,X7R,0603 CAP, TA,10UF,20%,6.3V,3216,A CAP, CER,470PF,10%,50V,X7R,0603 CAP, CER,470PF,10%,50V,X7R,0603 CAP, CER,470PF,10%,50V,X7R,0603 CAP, TA,4.7UF,20%,10V,A CAP, CER,470PF,10%,50V,X7R,0603 CAP, CER,470PF,10%,50V,X7R,0603 CAP, CER,470PF,10%,50V,X7R,0603 CAP, CER,0.1UF,+80-20%,25V,Y5V,0603 CAP, TA,10UF,20%,6.3V,3216,A CAP, CER,0.01UF,10%,25V,X7R,0603 CAP, CER,470PF,10%,50V,X7R,0603 CAP, CER,0.1UF,+80-20%,25V,Y5V,0603 CAP, CER,2PF,0.25PF,50V,COG,0603 CAP, CER,0.1UF,+80-20%,25V,Y5V,0603 CAP, CER,0.001UF,10%,50V,X7R,0603 CAP, CER,220PF,5%,50V,COG,0603 CAP, METAL,POLY,0.33UF,63V BOX CAP, METAL POLY,0.022UF,10%,63V BOX CAP, METAL POLY,0.01UF,10%,63V KBOX CAP, METAL POLY,0.01UF,10%,63V KBOX CAP, CER,1UF,+80-20%,16V,Y5V,0805 CAP, CER,0.1UF,+80-20%,25V,Y5V,0603 CAP, CER,220PF,5%,50V,COG,0603 CAP, CER,470PF,10%,50V,X7R,0603 CAP, CER,7PF,0.5PF,50V,COG,0805 CAP, CER,5.6PF,0.25PF,50V,COG,0603 CAP, CER,15PF,5%,50V,COG,0805 CAP, CER,470PF,10%,50V,X7R,0603 CAP, CER,6PF,0.5PF,50V,COG,0805 CAP, CER,27PF,5%,50V,COG,0805 CAP, CER,5PF,0.25PF,50V,COG,0603 CAP, CER,1UF,+80-20%,16V,Y5V,0805 CAP, CER,220PF,5%,50V,COG,0603 CAP, CER,3PF,0.25PF,50V,COG,0603 CAP, CER,220PF,5%,50V,COG,0603 CAP, CER,4.7PF,0.5PF,50V,COG,0805 CAP, CER,12PF,5%,50V,COG,0603 CAP, CER,6.8PF,0.5PF,50V,COG,0603 CAP, CER,1UF,+80-20%,16V,Y5V,0805 CAP, CER,220PF,5%,50V,COG,0603 CAP, CER,470PF,10%,50V,X7R,0603 CAP, CER,6.8PF,0.5PF,50V,COG,0603 CAP, CER,470PF,10%,50V,X7R,0603 CAP, CER,470PF,10%,50V,X7R,0603 CAP, CER,0.47UF,+20-80%,16V,Y5V,0805 650-110-0019 650-230-0017 650-100-0002 650-030-0026 100-621-1471 102-013-0106 100-621-1471 100-621-1471 100-621-1471 102-023-0475 100-621-1471 100-621-1471 100-621-1471 100-813-1104 102-013-0106 100-611-1103 100-621-1471 100-813-1104 100-020-1020 100-813-1104 100-621-1102 100-520-1221 083-013-2334 083-013-2223 083-014-2103 083-014-2103 100-803-2105 100-813-1104 100-520-1221 100-621-1471 100-110-2070 100-020-15R6 100-520-2150 100-621-1471 100-120-2060 100-520-2270 100-020-1050 100-803-2105 100-520-1221 100-020-1030 100-520-1221 100-120-24R7 100-520-1120 100-120-16R8 100-803-2105 100-520-1221 100-621-1471 100-120-16R8 100-621-1471 100-621-1471 100-803-2474 PART # REF # C60 C61 C62 C63 C64 C65 C66 C67 C68 C73 C74 C75 C76 C77 C78 C79 C80 C81 C82 C83 C84 C87 C88 C90 C92 C93 C94 C96 C97 C98 C100 C101 C102 C103 C104 C111 C117 C118 C121 C122 C123 C124 C125 C126 C127 C128 C129 C131 C133 C152 C901 C902 C904 C905 C906 C907 DESCRIPTION Cap, TA,4.7uF,20%,10V,A CAP, TA,10UF,20%,6.3V,3216,A CAP, CER,470PF,10%,50V,X7R,0603 CAP, CER,0.01UF,10%,25V,X7R,0603 CAP, CER,470PF,10%,50V,X7R,0603 CAP, TA,10UF,20%,10V,B,3528 CAP, CER,470PF,10%,50V,X7R,0603 CAP, CER,470PF,10%,50V,X7R,0603 CAP, CER,470PF,10%,50V,X7R,0805 CAP, CER,9PF,0.25PF,50V,COG,0805 CAP, CER,18PF,5%,50V,COG,0805 CAP, CER,4PF,0.25PF,50V,COG,0805 CAP, CER,1PF,0.25PF,50V,COG,0805 CAP, CER,470PF,10%,50V,X7R,0805 CAP, CER,470PF,10%,50V,X7R,0603 CAP, CER,0.1UF,10%,25V,X7R,0805 CAP, CER,470PF,10%,50V,X7R,0603 CAP, CER,470PF,10%,50V,X7R,0603 CAP, CER,470PF,10%,50V,X7R,0603 CAP, CER,7PF,0.5PF,50V,COG,0603 CAP, CER,470PF,10%,50V,X7R,0603 CAP, CER,9PF,0.5PF,50V,COG,0603 CAP, CER,0.1UF,+80-20%,25V,Y5V,0603 CAP, CER,7PF,0.5PF,50V,COG,0603 CAP, CER,24PF,5%,50V,COG,0603 CAP, CER,82PF,5%,50V,COG,0603 CAP, CER,1UF,+80-20%,16V,Y5V,0805 CAP, CER,0.01UF,10%,25V,X7R,0603 CAP, CER,30PF,5%,50V,COG,0603 CAP, CER,0.001UF,10%,50V,X7R,0603 CAP, TA,10UF,20%,6.3V,3216,A CAP, TA,10UF,20%,6.3V,3216,A CAP, CER,0.001UF,10%,50V,X7R,0603 CAP, CER,470PF,10%,50V,X7R,0603 CAP, TA,1UF,20%,25V,3216 CAP, CER,470PF,10%,50V,X7R,0603 CAP, CER,47PF,5%,50V,COG,0603 CAP, CER,33PF,5%,50V,COG,0603 CAP, CER,20PF,5%,50V,COG,0603 CAP, CER,0.01UF,10%,25V,X7R,0603 CAP, CER,0.01UF,10%,25V,X7R,0603 CAP, CER,0.1UF,10%,25V,X7R,0805 CAP, CER,0.1UF,10%,25V,X7R,0805 CAP, CER,0.01UF,10%,25V,X7R,0603 CAP, CER,0.01UF,10%,25V,X7R,0603 CAP, TA,4.7UF,20%,10V,A CAP, ELE,10UF,16V,20%,3X5,5.0PT CAP, CER,0.001UF,10%,50V,X7R,0603 CAP, CER,0.1UF,+80-20%,25V,Y5V,0603 CAP, CER,470PF,10%,50V,X7R,0603 CAP, CER,0.01UF,10%,25V,X7R,0603 CAP, CER,0.01UF,10%,25V,X7R,0603 CAP, CER,0.01UF,10%,25V,X7R,0603 CAP, CER,68PF,5%,50V,COG,0603 CAP, CER,220PF,5%,50V,COG,0603 CAP, CER,0.01UF,10%,25V,X7R,0603 PART # 102-023-0475 102-013-0106 100-621-1471 100-611-1103 100-621-1471 102-023-1106 100-621-1471 100-621-1471 100-621-2471 100-020-2090 100-520-2180 100-020-2040 100-020-2010 100-621-2471 100-621-1471 100-611-2104 100-621-1471 100-621-1471 100-621-1471 100-120-1070 100-621-1471 100-120-1090 100-813-1104 100-120-1070 100-520-1240 100-520-1820 100-803-2105 100-611-1103 100-520-1300 100-621-1102 102-013-0106 102-013-0106 100-621-1102 100-621-1471 102-053-0105 100-621-1471 100-520-1470 100-520-1330 100-520-1200 100-611-1103 100-611-1103 100-611-2104 100-611-2104 100-611-1103 100-611-1103 102-023-0475 081-032-3106 100-621-1102 100-813-1104 100-621-1471 100-611-1103 100-611-1103 100-611-1103 100-520-1680 100-520-1221 100-611-1103

NOTES: 1. Components are not available, assembly is non-repairable.

PAGE-27October 98

MAXON SD-125 RF LINK MODULE
REF # C909 CF1 CF2 CON1 D5 D6 D9 D12 D13 D14 D903 D904 H3 H4 IC1 IC2 IC3 IC5 IC7 IC8 L1 L2 L3 L4 L5 L6 L7 L8 L11 L12 L13 L14 L15 L18 L19 Q2 Q3 Q4 Q5 Q6 Q7 Q8 Q11 Q12 Q13 Q14 Q16 Q17 Q18 Q19 Q21 Q22 Q25 Q31 Q32 Q34 Q901 Q902 Q903 DESCRIPTION CAP, CER,0.01UF,10%,25V,X7R,0603 FILTER, CER, LT-455FW,455KHZ FILTER, CER,CF455HT,455KHZ CONN, SKT,18P/DIP,2.0MMST,SMT DIODE, PIN,UPP9401,(T&R)50V,2.5W DIODE, PIN,UPP9401,(T&R)50V,2.5W DIODE, SCHOTTKY,CHIP,HSMS-2817#L31 DIODE, SW,KDS193,SOT-23 DIODE, SW,KDS181S,SOT-23 DIODE, SW,KDS181S,SOT-23 DIODE, SW,KDS226,SOT-23 DIODE, SW,KDS226,SOT-23 SCRW, MACH,STL,M2X6,FLH,PHL,ZN SCRW, MACH,STL,M2X6,FLH,PHL,ZN IC, VREG,TK11450MTR,+5V,SOT-23L,(R5) IC, PLL,MC145191FR2,SO-20,RS-440 IC, OP AMP,LM358MX,SO-8,DUAL IC, VHF RCVR,MC3371D,SO-16,NWRBAND IC, OP AMP,LM358MX,SO-8,DUAL IC, OP AMP,DUAL,TL062CDR,SO-8 COIL, CHIP,18NH,20%,LL2012-F18NM COIL, CHIP,18NH,20%,LL2012-F18NM COIL, CHIP,18NH,20%,LL2012-F18NM COIL, CHIP,18NH,20%,LL2012-F18NM COIL, CHIP,18NH,20%,LL2012-F18NM COIL, CHIP,0.82UH:NL252018T-R82J COIL, SPRG, 2X0.75X3T:L SMD COIL, SPRG, 2X0.75X3T:L SMD COIL, SPRG, 2X0.75X3T:L SMD COIL, CHIP,1.2UH,5%,NL252018T-1R2J COIL, SPRG, 1.0X0.35X7T;R, COIL, CHIP,0.47UH:NL252018T-R47J COIL, CHIP,0.15UH,5%,NL252018T-R15J COIL, CHIP,1UH,5%,NL252018T-1R0J COIL CHIP,10UH,CYLNDRCL,+/-10%,1206 TRANS, PNP,KRA110SPK,SOT-23,SW,PK TRANS, PNP,KRA110SPK,SOT-23,SW,PK TRANS, PNP,KRA110SPK,SOT-23,SW,PK TRANS, PNP,KRA104S,SOT-23,SW,(PD) TRANS, NPN,KTC3875(BL),SOT-23, TRANS, PNP,KTA1504(Y),SOT-23,SW TRANS, PNP,KTA1504(Y),SOT-23,SW TRANS, NPN,KTC3875(BL),SOT-23, TRANS, NPN,BFR92A,SOT-23 TRANS, NPN,KTC3875(BL),SOT-23, TRANS, NPN,KTC3875(BL),SOT-23, TRANS, NPN,BFR92A,SOT-23 TRANS, 900MHZ AMP,MMBR951,SOT-23 TRANS, NPN,KRC104SND,SOT-23,SW,ND Trans, NPN,KTC3875(BL),SOT-23, TRANS, NPN,KTC3875(BL),SOT-23, TRANS, NPN,BFR92A,SOT-23 TRANS, NPN,KRC104SND,SOT-23,SW,ND TRANS, NPN,KRC104SND,SOT-23,SW,ND TRANS, NPN,KRC104SND,SOT-23,SW,ND TRANS, NPN,KTC4075,UMT3 TRANS, PNP,KTA2014, USM TRANS, NPN,KTC4075,UMT3 PART # 100-611-1103 310-101-0010 310-010-0013 140-020-0056 220-020-0001 220-020-0001 220-040-0009 220-010-0003 220-010-0004 220-010-0004 220-010-0005 220-010-0005 330-110-0142 330-110-0142 441-010-0002 440-050-0011 441-030-0006 441-060-0007 441-030-0006 441-030-0012 371-010-5180 371-010-5180 371-010-5180 371-010-5180 371-010-5180 371-804-3R82 350-000-0103 350-000-0103 350-000-0103 371-004-31R2 350-000-0095 371-804-3R47 371-004-3R15 371-017-3102 371-005-3103 870-010-0010 870-010-0010 870-010-0010 870-010-0005 870-200-0006 870-100-0004 870-100-0004 870-200-0006 870-200-0020 870-200-0006 870-200-0006 870-200-0020 870-200-0026 870-020-0001 870-200-0006 870-200-0006 870-200-0020 870-020-0001 870-020-0001 870-020-0001 870-200-0031 870-100-0018 870-200-0031 REF # Q904 Q905 R1 R2 R3 R4 R5 R6 R7 R8 R11 R12 R13 R14 R15 R16 R17 R21 R22 R23 R24 R25 R26 R27 R28 R31 R32 R33 R34 R35 R36 R37 R41 R42 R43 R45 R46 R47 R48 R49 R50 R51 R52 R53 R54 R55 R56 R57 R58 R59 R61 R64 R65 R66 R68 R69 R70 R71 R72 DESCRIPTION TRANS, NPN,KTC4075,UMT3 TRANS, NPN,KTC4075,UMT3 RES, TF,10K,5%,1/16W,+/-200,0603 RES, TF,100K,5%,1/16W,+/-200,0603 RES, TF,2.2K,5%,1/16W,+/-200,0603 RES, TF,1.8K,5%,1/16W,+/-200,0603 RES, TF,1.8K,5%,1/16W,+/-200,0603 RES, TF,2K,5%,1/16W,+/-200,0603 RES, TF,1.8K,5%,1/16W,+/-200,0603 RES, TF,910,5%,1/10W,TC250,0805 RES, TF,100,5%,1/16W,+/-200,0603 RES, TF,5.6K,5%,1/16W,+/-200,0603 RES, TF,2.7K,5%,1/16W,+/-200,0603 RES, TF,2.7K,5%,1/16W,+/-200,0603 RES, TF,100,5%,1/16W,+/-200,0603 RES, TF,910,5%,1/10W,TC250,0805 RES, TF,12K,5%,1/16W,+/-200,0603 RES, TF,33,5%,1/16W,+/-200,0603 RES, TF,4.7K,5%,1/16W,+/-200,0603 RES, TF,100,5%,1/16W,+/-200,0603 RES, TF,5.6K,5%,1/16W,+/-200,0603 RES, TF,4.7K,5%,1/16W,+/-200,0603 RES, TF,18,5%,1/16W,+/-200,0603 RES, TF,4.7K,5%,1/16W,+/-200,0603 RES, TF,220,5%,1/16W,+/-200,0603 RES, TF,300,5%,1/16W,+/-200,0603 RES, TF,300,5%,1/16W,+/-200,0603 RES., TF,6.8K, 5%, 1/16W,+/-200, 0603 RES, TF,18,5%,1/16W,+/-200,0603 RES, TF,5.6K,5%,1/16W,+/-200,0603 RES, TF, 0, 5%,1/16W, +/-200,0603 RES, TF,1.2K,5%,1/16W, +/-200,0603 RES, TF,100,5%,1/16W,+/-200,0603 RES, TF,12K,5%,1/16W,+/-200,0603 RES, TF,10K,5%,1/16W,+/-200,0603 RES, TF,12K,5%,1/16W,+/-200,0603 RES, T