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XR-4880
SERVICE MANUAL
AEP Model UK Model

Photo: XR-4880

Model Name Using Similar Mechanism Tape Transport Mechanism Type

XR-C6100R MG-25F-136

SPECIFICATIONS

FM/MW/LW CASSETTE CAR STEREO
MICROFILM

SECTION 6 DIAGRAMS
· IC Block Diagrams ­ MAIN Board ­

IC301 IC351 LB1930M-TLM

CXA2509AQ-T4
LINEOUT2 TAPEIN2 PBOUT2 AUXIN2 PBEQ2 MSSW DIREF

IC21 TB2118F (EL)
AM CP OUT FM CP OUT A-GND D-GND AM IN FM IN

GND

NC
24dB

VCC 1 NC 2 IN1 3 IN2 4

VDD

REG

VCC

IFC

VT

10 NC BUFFER CONTROL CIRCUIT BUFFER MOTOR DRIVE CIRCUIT 9 OUT1 8 NC 7 OUT2 6 P-GND

XI

30

29

28 27

26

25

24

23 22 21

24 23

22 21

20

19

18

17 AMP

16 15 14 13

120µ/70µ T2 ­ + PBFB2 31 PBRIN2 32 PBREF2 33 F2 TAPE EQ FWD/RVS NR BIAS X1 TAPE/AUX + ­

+
VCC 4BIT SWALLOW COUNTER SEEK/RECP PRESCALLER 12BIT PROGRAMMABLE COUNTER ­ + + ­

VDD AMP

NC

20 MSMODE MS MODE 19 DRSW 18 TAPESW 17 INSW 16 NC

S-GND 5

REGULATOR SEEK/RECP

AMP

+

PBFIN2 34

PHASE COMPARATOR
REF

SIG

VCT 35 PBGND 36

VCT + LPF

VCC + ­ F3 X1

20BIT IF COUNTER 40BIT SHIFT REGISTER 18BIT 22BIT
PBFIN1 37 PBREF1 38 PBRIN1 39 PBFB1 40 F1

MS ON/ 15 NC OFF DETECT 14 MSOUT 13 DGND

OSCILLATOR

REFERENCE DIVIDER

T1

BUFFER
VDD2

SERIAL INTERFACE

I/O PORT

OUTPUT PORT

120µ/70µ 1 2 3 4 5 6 7

LINEOUT1

TAPEIN1 AUXIN1

PBOUT1

MSLPF

PBEQ1

1
XO

2
OSC

3 4 5 6
CE DIN CK DOUT

7
SR

8
I/O-1

9
I/O-2

10 11
OUT-1 OUT-2

12
VDD2

IC661 IC331 TDA7462D
28 27 26 25 24 23 SE3L SE3R MUTE SDA SCL PAUSE

BA3918-V2

REGULATOR

PAUSE DETECT INPUT GAIN & AUTO ZERO TREBLE/ BASS CONTROL CIRCUIT FRONT FADER

HP

LP FRONT FADER 21 OUT FR

INPUT MULTIPLEXER & MIXING STAGE

COMPANDER
1 2 3 4 MODE2 MODE1 STB 5 VDD 6 AMP 7 VCC 8 ANT 9 COM 10 AM 11 FM 12 GND

REAR SIDE SELECTOR

REAR FADER LOUDNESS CONTROL CIRCUIT

20 OUT RL

INPUT GAIN

REAR FADER

19 OUT RR

IC751

NC

TDA7385

BEEP

SUBWOOFER LP

FADER 18 SUBOUT+ 17 SUBOUT­ SDA

SUBWOOFER OUT IIC BUS

DIGITAL CONTROL CIRCUIT

SCL 16 VDD 15 GND

­ 17 ­

TAB PW-GND OUT2­ ST-BY OUT2+ Vcc1 OUT1­ PW-GND1 OUT1+ SVR IN1 IN2 S-GND IN4 IN3 AC-GND OUT3+ PW-GND3 OUT3­ Vcc2 OUT4+ MUTE OUT4­ PW-GND4 DIAGNOSTICS OUT

CREF 14

POWER SUPPLY

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25

­ 18 ­

+ ­

+ ­

+ ­

+ ­

SE1L SE1R MD+ MD­ CDL+ CDL­ CDR­ CDR+ PDR PDGND PDL SE2L SE2R

1 2 3 4 5 6 7 8 9 10 11 12 13

FRONT SIDE SELECTOR

LOUDNESS CONTROL CIRCUIT

VOLUME CONTROL CIRCUIT

SOFT MUTE

VOICE BANDPASS

22 OUT FL

OVER VOLTAGE PROTECT

G2FB

VCC

NC

NC

­ + 24dB 8 9 10

+ ­

ON/OFF

18BIT

12 MSTC 11 G1FB

XR-4880
6-2. SCHEMATIC DIAGRAM -- MAIN (1/2) SECTION -- · Refer to page 17 for IC Block Diagrams. · Refer to page 29 for IC Pin Function Description.

FAE342-E01

· Waveforms

1
2.8Vp-p

18.432MHz

(FL)

IC501 !TM OSC2

2
5.0Vp-p
A (OFF) B (ON)

32.768MHz

IC501 !§ XO

Note on Schematic Diagram: · All capacitors are in µF unless otherwise noted. pF: µµF 50 WV or less are not indicated except for electrolytics and tantalums. · All resistors are in and 1/4 W or less unless otherwise specified. ˘ · : internal component. · C : panel designation. · U : B+ Line. · Power voltage is dc 14.4V and fed with regulated dc power supply from ACC and BATT cords. · Voltage and waveforms are dc with respect to ground under no-signal conditions. no mark : FM < > : TAPE PLAYBACK : Impossible to measure · Voltages are taken with a VOM (Input impedance 10 M). Voltage variations may be noted due to normal production tolerances. · Waveforms are taken with a oscilloscope. Voltage variations may be noted due to normal production tolerances. · Circled numbers refer to waveforms. · Signal path. F : FM f : AM (MW) E : TAPE PLAYBACK

(Page 23, 24)

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XR-4880
6-3. SCHEMATIC DIAGRAM -- MAIN (2/2) SECTION -- · Refer to page 17 for IC Block Diagrams. · Refer to page 19 for Printed Wiring Board.

(Page 21, 22)

(Page 27)

Note on Schematic Diagram: · All capacitors are in µF unless otherwise noted. pF: µµF 50 WV or less are not indicated except for electrolytics and tantalums. · All resistors are in and 1/4 W or less unless otherwise specified. ˘ : internal component. · · C : panel designation. · U : B+ Line. · Power voltage is dc 14.4V and fed with regulated dc power supply from ACC and BATT cords. · Voltage and waveforms are dc with respect to ground under no-signal conditions. no mark : FM < > : TAPE PLAYBACK : Impossible to measure · Voltages are taken with a VOM (Input impedance 10 M). Voltage variations may be noted due to normal production tolerances. · Waveforms are taken with a oscilloscope. Voltage variations may be noted due to normal production tolerances. · Circled numbers refer to waveforms. · Signal path. F : FM f : AM (MW) E : TAPE PLAYBACK

­ 23 ­

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XR-4880
6-5. SCHEMATIC DIAGRAM -- PANEL SECTION -- · Refer to page 25 for Printed Wiring Board.

(Page 23)

Note on Schematic Diagram: · All capacitors are in µF unless otherwise noted. pF: µµF 50 WV or less are not indicated except for electrolytics and tantalums. · All resistors are in and 1/4 W or less unless otherwise specified. ˘ · : internal component. · C : panel designation. · U : B+ Line.

· Power voltage is dc 14.4V and fed with regulated dc power supply from ACC and BATT cords. · Voltage and waveforms are dc with respect to ground under no-signal conditions. no mark : FM < > : TAPE PLAYBACK : Impossible to measure · Voltages are taken with a VOM (Input impedance 10 M). Voltage variations may be noted due to normal production tolerances.

· Waveforms are taken with a oscilloscope. Voltage variations may be noted due to normal production tolerances. · Circled numbers refer to waveforms. · Signal path. F : FM f : AM (MW) E : TAPE PLAYBACK

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6-6. IC PIN FUNCTION DESCRIPTION
· IC501 MASTER U-COM (MN101C12GTC1) Pin No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 Pin Name VREFVSM KEYIN1 KEYIN0 DBASS IN DSTSEL FUNC-SEL ­ RC-IN0 VREF+ VDD OSC2 OSC1 VSS XI XO MMOD GND RC-IN1 SYSRST BUSON UNISO UNISI UNICKO UNICKI ­ KEYACK NOSESW BU-IN SIRCS TELMUT TEST-IN RAMBU RESET VOL-MUT BEEP AMPMUT AMPON PLL-CKD PLL-CE PLL-SO PLL-SI LCD-SO LCD-CE LCD-CKO VOL-SIO ­ VOL-CKD ACC-IN MUT I/O ­ I I I I I I O I I ­ ­ ­ ­ ­ ­ ­ I O O O I O I O I I I I I I I I O O O O O O O I O O O O O O I O Function Basic voltage (- side) of AD conversion input FM/AM common signal meter A/D conversion input terminal KEY (AD conversion) input Position detecting AD input terminal of D-BASS Terminal for setting to select the value of destination Function selecting (AD conversion) input Not used Rotary commander (AD conversion) input Basic voltage (+side) of AD conversion input Power supply Radiator (18.432 MHz) connecting terminal Ground Sub clock (for clock) radiator (32 kHz) connecting terminal Ground Rotary commander shift input SYSTEM RESET control output BUS ON control output Serial data output Serial data input Serial clock output Serial clock input Not used Key input acknowledge Removing/attaching front panel detection input BACK-UP detection input terminal Remote control input TELEPHONE MUTE detection input Test mode setting input terminal Reset detection input of RAM Reset input terminal Electrical volume mute control output Control output for buzzer Power amplifier mute control output terminal Power amplifier STANDBY control terminal PLL CLK output terminal PLL CE output terminal PLL DATA output terminal PLL DATA input terminal LCD serial data output LCD chip enable output terminal LCD serial clock output Electrical volume serial data output Not used Electrical volume serial data output Accessory power supply detection input System MUTE control output

­ 29 ­

Pin No. 50 51 52 53 54 55 56 57 to 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 to 99 100 NCO

Pin Name AMSON N/R-OUT MTLON TAPMUT DOLON AMSIN NCO ST SD-IN REIN 1 REIN 0 AD ON PW SEL ILLON REL POS3 POS2 POS0 POS1 LM LOD LM EJ TAPON CM ON PW ON FM ON TUNON DAVSS NCO DAVDD

I/O O O O I/O O I/O I O I/O I I I O I O I I I I I O O O O O O O ­ O ­ Tape position signal detection input Not used "L" is output in AMS mode FWD/REV control output Metal control input/output Tape mute control output Dolby control input/output

Function

Input to detect existence of song during AMS mode Not used Combination stereo input and monaural output SIGNAL DETECTOR input terminal Rotary encoder input terminal Power supply control output of AD conversion Power selection initialise Illumination power supply control output Input to detect rotation of reel table

Loading motor control output (to a direction of loading) Loading motor control output (to a direction of ejection) TAPE power supply control output When `on' is output, "H" is output, otherwise when `off' is output, "L" is output. Capstan motor control signal output terminal of TAPE System power supply control output FM power supply control output terminal TUNER power supply control output terminal Ground Not used Not used (Power supply for DA converter)

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