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Technical Service Data
INDEX

ZENITH
Models SMS2549S SMS2549SM SMS2550S

Parts List Coils & Transformers Miscellaneous Controls & Resistors Capacitors & Electrolytics Cabinet Parts Semiconductors, 2 pages Schematics . . . . . . . . . . . . . . . . . . . Location Television . . . . . . . . . . . . . . . . . 2A, 2B Television . . . . . . . . . . . . . . . . . 2C, 2D Power Supply . . . . . . . . . . . . . . . . . . 2E System Control . . . . . . . . . . . . 1A, 1B Tuner . . . . . . . . . . . . . . . . . . . . . . 1C, 1D Placement Chart

SCHEMATIC NOTES
For SAFETY use only equivalent replacement part, see parts list. Circuitry not used in some versions. Circuitry used in some versions.

To purchase a complete paper version of this service manual, order PHOTOFACT ® set #3503 To place the order, contact your local Sams Distributor or call our Customer Service operation at 1-800-428-7267.

Ground Chassis ground Common tie point Taken from common tie point

3
A

Schematic voltage source tie point. Cabling: Heavy lines reduce use of multiple lines. Waveforms and voltages are taken from ground, unless noted otherwise. Waveforms taken with triggered scope and keyed rainbow generator. Waveform voltage is peak to peak. Timebase is per division. Waveforms shown at 10 divisions. Supply voltages maintained as seen at input. Voltages measured with digital meter and a 1000µV RF signal, with colorbar pattern, applied to antenna terminal. Controls adjusted for normal operation. Capacitors are 50 volts or less, 5% or greater unless noted. Electrolytic capacitors are 50 volts or less, 20% or greater unless noted. Resistors are 1/2W or less, 5% or greater unless noted. Value in ( ) used in some versions. Measurements with switching as shown, unless noted. Rated voltage shown on zener diodes.

For E:fact ordering or information, use the following web site link. http://www.hwsams.com/efact.html Product #083503 © Copyright 1999 Howard W. Sams & Co. All rights reserved.

PARTS LIST
COILS & TRANSFORMERS
Item No. DY1 Function/Rating Yoke 100° Horiz .79mH Vert 10mH 22µH AFT Video Detector Audio Detector .82µH 16µH 12µH Degaussing Horizontal Linearity Ferrite Bead 68µH Ferrite Bead Mfr. Part No. 95-3608-04

COILS & TRANSFORMERS continued
Item No. L3412 L3413 L3414, 15 L3499 L5500 L6000 L6001 L6012 L6090 # LX3401 # TX3200 (1) # TX3201 # TX3410 Function/Rating Ferrite Bead Ferrite Bead Ferrite Bead 120µH 1µH 10µH 68µH Line Choke Horizontal Output Horizontal Driver Horizontal Driver Regulator Mfr. Part No. 149-576-01 20-4201 149-576 20-3907-25A 20-4277-10A 20-3907-12A 20-3907-22A 95-3868-02 95-4430 95-4445 95-4442 95-4443

L1200 L1201 L1202 L1203 L1205 L2101 L2200 L2202 L2203 L3000 L3201 L3206 L3208 L3299

20-4277-26A 20-4172-12A 20-4172-05A 20-4278B 20-4277-09A 20-4277-24A 20-4277-40A 20-4330-19 20-4073-03 20-309-22A 149-576-01

TUNER
L3 L4 L5 L6 L7 L8 L9 L10 L13 L14 L15 L16 L17 L19 L22 L23 L30 L100 L101 L102 L103, 04 L106 L107 L108 L109 L111 L112 L113 L114 L117 L118 L149 .22µH 3.3µH 1.0µH 20-4470-03 20-4470-05 20-4470-06 20-4470-07 20-4470-08 20-4470-09 20-4470-10 20-4470-11 20-4470-02 20-4470 20-4470-13 20-4470-12 20-4470-02 20-4470-14 20-4470-15 20-4470-16 20-4470-17 20-4470-27 20-4325-01 20-4328-46 20-4470-18 20-4442 20-4470-01 20-4470-19 20-4470-20 20-4470-21 20-4470-22 20-4470-23 20-4470-24 20-4470-25 20-4277-60A 20-4470-26 20-4277-16A 20-4277-10A

# For SAFETY use only equivalent replacement part. (1) Focus and screen (G-2) controls are part of TX3200.

PARTS LIST continued
MISCELLANEOUS
Item No. CR2200 CR2212 CR6000 CRT1 # FX3499 IR1 # KX3401 P3400 SP1 SW1 SW2 SW3 SW4 SW5 SW6 SW7 SW8 SW9 SW10 TU6000 U1200 U1201 U2200 U2201 V1 Description Crystal Resonator Crystal Socket Fuse Receiver Relay Line Cord Speaker Switch Switch Switch Switch Switch Switch Switch Switch Switch Switch Tuner (1) Filter Trap Delay Line Filter CRT Balun Fuse Holder Magnet PC Board (1) PC Board (1) Transmitter Transmitter Wedge Mfr. Part No. 224-27A 224-131 224-157A 78-3394 136-113-23A 162-35 195-158 A-17339 49-1368-03 85-1691A 85-1691A 85-1691A 85-1691A 85-1691A 85-1691A 85-1691A 85-1691A 85-1691A 85-1691A 175-2402 224-54A 224-160 105-218 224-23 A-14323 19-840-02 A-7690-05 A-17931 9-1458-01 124-185-06 124-157-37 152-338 Notes 3.58MHz 503kHz 12.083916MHz CRT 4Amp, 250V, Normal Lag Remote Degaussing AC, Polarized 2" X 5", 8 Ohms, 5W Off/On Channel Up Channel Down Volume Up Volume Down Menu Select Adjust Right Adjust Left Enter UHF/VHF 4.5MHz SAW 4.5MHz A63ADG31X Antenna For FX3499 (2 Used) Purity/Convergence Keyboard Main Remote Remote, Used in model SMS2550S Yoke Positioning (3 Used)

TUNER
XT1 Crystal 224-138 4MHz

# For SAFETY use only equivalent replacement part. (1) Contact PTS Electronics Corporation for replacement; order by manufacturer's part number.

PARTS LIST continued
CONTROLS & RESISTORS
Item No. R1208 R2106 R3201 R3419 R5509 R5510 R5511 R6068 R6069, 70 RX806 RX807 RX809 RX810 RX2260 RX2261 RX2263 RX2264 Function/Rating 5000 RF AGC 10K Vertical Size 2200 5% 2W 4700 5% 3W 1000 5% 10W Wirewound 820 5% 7W Wirewound 1000 Blue Gain 2000 Blue Gain 1000 Red Gain 2000 Red Gain 1000 Green Gain 2000 Green Gain 5100 2% 1/4W 1000 2% 1/4W 1000 5% 1/4W 1 5% 1/4W 10 5% 1/2W 1 5% 1/4W 820 5% 1/8W 3300 5% 1/8W 5.6 5% 1/8W 4700 5% 1/8W 2200 5% 1/8W 3900 5% 1/8W 2400 5% 1/8W 3300 5% 1/8W 2.2M 10% 1/2W 5.6M 20% 1/2W 1000 5% 1/4W 56K 5% 1/2W 56K 5% 1/4W 680 5% 1/4W 100 5% 1/4W 56K 5% 1/2W 56.2K 1% 1/2W 3730 1% 1/4W 3400 1% 1/4W 1.8 5% 2W 1.2 5% 2W 1 5% 5W Wirewound 220K 5% 1/2W 1 5% 1/2W 250 B+ 1.5 5% 5W Wirewound 12.8 Cold PTC Mfr. Part No. 63-11007-25 63-11007-27 63-11164-88A 63-10458-96 63-10449-94A 63-10857-31 63-10857-11 63-10857-32 63-10233-89 63-10233-72 63-10559 63-10565-24C 63-10559 63-10979-45 63-10979-59 63-10980-35 63-10979-55 63-10979-56 63-10979-59 63-11182 63-10235-72 63-11088-14 63-10236-14 63-10235-68 63-10235-48 63-11088-14 63-11082-72 63-10936-59 63-10420-26 63-10442-24A 63-11088-28 63-10565 63-10857-34 63-10442-28A 63-10710A NTE Part No. 2W222 3W247 10W210 QW251 QW210 QW210 QW1D0 HW010 QW1D0 EW182 EW233 EW5D6 EW233 HW522 HW556 QW210 HW356 QW356 QW168 QW110 HW356 2W1D8 2W1D2 5W1D0 HW422 HW1D0 5W1D5 -

# # # # # # # #

# RX2265 # RX2266 # RX3401 # # # # # # # # RX3402 RX3410 RX3411 RX3412 RX3413 RX3414 RX3415 RX3417

# RX3421 # # # # # # RX3425 RX3449 RX3450 RX3475 RX3480 RX3497

# For SAFETY use only equivalent replacement part.

PARTS LIST continued

CAPACITORS & ELECTROLYTICS
Item No. C1218 C1219 C1220 C1221 C2205 C3209 C3221 C3416 C3472 C5503 C5504 C6093 C9717 CX804 CX2223 CX2224 CX3203 CX3210 CX3402 CX3410 CX3411 Rating 18pF 5% 50V NPO 68pF 5% 50V NPO 30pF 5% 50V N150 7pF ±.5pF 50V NPO 1µF 20% 50V NP 470pF 10% 500V NPO 220pF 3kV .001 10% 1kV .001 10% 500V .001 10% 1kV .001 10% 2kV .01 +80% -20% 1.5kV .01 10% 50V N075 1µF 50V NP 1000µF 20% 25V 4.7µF 20% 50V 47µF 20% 25V .019 3% 1.6kV 530pF 10% 3kV .47 5% 250V .001 10% 1kV 1µF 20% 100V 1µF 20% 50V 330µF 20% 25V 220µF 20% 160V 47µF 20% 160V .001 10% 1kV .001 10% 500V .0047 20% 470µF 20% 200V 2200µF 20% 16V .0047 20% Mfr. Part No. 22-8241-16A 22-8241-30A 22-8245-21A 22-8241-07A 22-8190-01A 22-7786-10C 22-7786C 22-7811A 22-7523 22-7755 22-8257-24A 22-8310-16 22-8312-07A 22-8310-11A 22-8229-41 22-8063 22-7876-20 22-7811A 22-8312-04A 22-8310-14 22-8315-11 22-7786C 22-7786C 22-7431-06 22-7819-10 22-8309-17 22-7431-06

# # # # # # # #

# CX3412 # CX3413, 14 # CX3418 # # # # CX3425 CX3449 CX3474 CX3499

TUNER
C2, 4, 7 C9 C10, 11 C13, 14 .001 +130% -0% 50V Feedthru 82pF 10% 50V Feedthru .001 +80% -20% 50V Feedthru 43pF 10% 50V Feedthru 22-7894-06 22-7993-06 22-8304-02 22-8303-03

# For SAFETY use only equivalent replacement part.

PARTS LIST continued

CABINET PARTS
Item Model SMS2549S
Cabinet Front Cabinet Rear Cabinet Tray Jack Panel - Antenna Lens - Primary Controls and Remote Receiver Pushbutton Knob 14-12142-19 14-12181 14-12143-01 12-10156-17 192-858-01 46-10554

Part No.

SEMICONDUCTORS
(Select the replacement that gives the best results.) Item No. C3483 CR800, 01 CR1201 CR2100 CR2201 CR2202 CR2206 CR2207 Thru CR2211 CR2213 Thru CR2218 CR3200, 01 CR3203 CR3488, 90 CR3492 CR3493 CR6002 CR6090 CRX2203, 04 CRX2205 CRX3204 CRX3410 CRX3411 CRX3412 CRX3471 Thru CRX3474 IC2100 IC3200 IC6000 IC6001 ICX1200 Q800 Q801 Q802 Q1201 Q1202 Q2200 Q2201, 09 Q2210 Q2212 Q3201 Q3420 Q3422 Q3423 Q5500, 01, 02 Q5503 Q6000, 01, 02 Q6003 Q6004 Q6020 QX3200 Type No. LA7833 TA8879N MPS4250 Mfr. Part No. 103-398 103-279-18A 103-326A 103-279-18A 103-398 103-279-18A 103-398 103-398 103-284A 103-279-36A 103-295A 103-279-10A 103-398 103-279-18A 103-398 103-279-18A 103-326A 103-326A 103-315-06A 221-903 221-166 221-898 221-745-04 221-806 121-975A 121-1300-01A 121-1301-01A 121-1261A 121-975A 121-1019A 121-975A 121-1256A 121-1019A 121-1290 121-973A 121-1145A 121-1146A 121-1291-01 121-1140 121-975A 121-975A 121-978-03A 121-1167-01 NTE Part No. NTE552 NTE552 NTE5085A NTE177 NTE5010A NTE552 NTE552 NTE116 NTE960 NTE123AP NTE123AP NTE159 NTE123AP NTE159 NTE159 NTE290A NTE123AP NTE399 NTE123AP NTE159 NTE123AP NTE159 ECG Part No. ECG552 ECG552 ECG5085A ECG177 ECG5010A ECG552 ECG552 ECG116 ECG960 ECG123AP ECG123AP ECG159 ECG123AP ECG159 ECG159 ECG290A ECG123AP ECG399 ECG123AP ECG159 ECG123AP ECG159 TCE Part No. SK9000 SK9000 SK36V SK9091 SK5A1 SK9000 SK9000 SK3313 SK3591 SK3854 SK3854 SK3466 SK3854 SK3466 SK3466 SK3114A SK3854 SK9352 SK3854 SK3466 SK3854 SK3466 -

# # # # # # # #

#

#

# For SAFETY use only equivalent replacement part.

SEMICONDUCTORS continued
(Select the replacement that gives the best results.) Item No. # QX3410 # QX3412 Type No. Mfr. Part No. 121-1146A 121-1299 NTE Part No. NTE123AP ECG Part No. ECG123AP TCE Part No. SK3854 -

TUNER
CR1, 2 CR3 CR4, 5 CR7, 8 CR10 CR11 CR12 CR14, 15 CR101 Thru CR106 IC1 IC2 Q1 Q3, 04, 05 Q7 Q101 103-488A 103-487A 103-488A 103-487A 103-488A 103-487A 103-488A 103-487A 221-748 221-760 121-1216A 121-1282A 121-1130A 121-1162A -

# For SAFETY use only equivalent replacement part.