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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 o