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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 13 120/70 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 120/70 1 2 3 45 6 7 LINEOUT1 TAPEIN1 AUXIN1 PBOUT1 MSLPF PBEQ1 1 XO 2 OSC 3456 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 1 234 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 F unless otherwise noted. pF: F 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) - 21 - - 22 - 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 F unless otherwise noted. pF: F 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 - - 24 - 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 F unless otherwise noted. pF: F 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 - 27 - - 28 - 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) - 30 - |
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