XR-C5120

SERVICE MANUAL

US Model Canadian Model

Model Name Using Similar Mechanism Tape Transport Mechanism Type

XR-C5100 MG-25F-136

SPECIFICATIONS
FM/AM CASSETTE CAR STEREO

MICROFILM

SCHEMATIC DIAGRAM MAIN Board (1/2)
See page 16 for Waveforms.
See page 27 for IC Block Diagrams.
SCHEMATIC DIAGRAM MAIN Board (2/2)
See page 28 for IC Block Diagrams.

(Page 25)

SCHEMATIC DIAGRAM KEY Board
See page 16 for Waveform.

(Page 22)

IC Block Diagrams MAIN Board IC21 TB2118F-EL-S
AM CP OUT FM CP OUT A-GND D-GND

TDA7462D

17 AMP
PAUSE DETECT INPUT GAIN & AUTO ZERO TREBLE/ BASS CONTROL CIRCUIT FRONT FADER
SE3L SE3R MUTE SDA SCL PAUSE
VCC 4BIT SWALLOW COUNTER SEEK/RECP PRESCALLER 12BIT PROGRAMMABLE COUNTER 20BIT IF COUNTER 40BIT SHIFT REGISTER 18BIT ON/OFF BUFFER SERIAL INTERFACE I/O PORT OUTPUT PORT

VDD2 AMP

INPUT MULTIPLEXER & MIXING STAGE

REGULATOR SEEK/RECP

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

FRONT SIDE SELECTOR

LOUDNESS CONTROL CIRCUIT

VOLUME CONTROL CIRCUIT

SOFT MUTE

VOICE BANDPASS HP LP

22 OUT FL
FRONT FADER COMPANDER REAR FADER LOUDNESS CONTROL CIRCUIT

21 OUT FR

REAR SIDE SELECTOR

20 OUT RL

INPUT GAIN

OSCILLATOR

REFERENCE DIVIDER

REAR FADER

19 OUT RR
BEEP SUBWOOFER LP FADER 18 SUBOUT+ 17 SUBOUT SDA DIGITAL CONTROL CIRCUIT IIC BUS SCL 16 VDD 15 GND

SUBWOOFER OUT

CE DIN CK DOUT

OUT-1 OUT-2

VDD2 CREF 14 POWER SUPPLY

IC351 IC301 CXA2509AQ-T4

LINEOUT2 TAPEIN2 PBOUT2 AUXIN2 PBEQ2 MSSW DIREF

LB1930M-TLM

10 NC BUFFER CONTROL CIRCUIT BUFFER MOTOR DRIVE CIRCUIT 9 OUTNC 7 OUTP-GND

BA3918-V2

VCC 1 NC 2 ININS-GND 5

REGULATOR

21 24dB
120/70 T2 + PBFBPBRINPBREFPBFINF2 TAPE EQ FWD/RVS VCT 35 PBGND 36 VCT + PBFINPBREFPBRINPBFBT1 120/70 1

+ 20 MSMODE NR BIAS

OVER VOLTAGE PROTECT + 11 FM 12 GND + 10 AM + 5 VDD 6 AMP 7 VCC 8 ANT 9 COM +

X1 TAPE/AUX

MS MODE
19 DRSW 18 TAPESW 17 INSW 16 NC

14 MSOUT F1 XDGND

BUS ON 1
BUS ON SWITCH RESET SWITCH BATTERY SWITCH

14 VCC

12 MSTC + + 11 G1FB

BATT 3

RST BUS ON CLK IN BU IN

24dB 6

PBOUT1

TAPEIN1 AUXIN1

LINEOUT1
CLK 4 VREF 5 DATA 6 GND 7

9 DATA IN 8 DATA OUT

MODE2 MODE1 STB

MS ON/ 15 NC OFF DETECT

BA8270F-E2
6-7. IC PIN FUNCTION DESCRIPTION
MAIN BOARD IC501 MN101C12GTA1 (SYSTEM CONTROLLER) Pin No. 3 Pin Name AVREF VSM KEYIN1 I/O I I I Function Reference voltage (0V) input terminal (for A/D converter) FM and AM signal meter voltage detection input from the FM/AM tuner unit (TU1) (A/D input) Key input terminal (A/D input) (LSW921 to LSW923, LSW927 to LSW933) 6, PRESET DISC /+, DSPL, 6, 5, 4 n, 3 PLAY MODE, 2 SET UP, 1 N keys input Key input terminal (A/D input) (LSW901 to LSW903, S901, LSW905, LSW906) OFF, SOURCE, MODE *, SEEK/AMS = 0 + ) +, SOUND, SHIFT keys input D-BASS switch (S981) input terminal (A/D input) Destination setting terminal (fixed at center voltage in this set) Setting terminal for the function select (fixed at H in this set) Not used (open) Rotary remote commander key input terminal (A/D input) Reference voltage (+5V) input terminal (for A/D converter) Power supply terminal (+5V) Main system clock output terminal (18.432 MHz) Main system clock input terminal (18.432 MHz) Ground terminal Sub system clock input terminal (32.768 kHz) Sub system clock output terminal (32.768 kHz) Ground terminal Rotary remote commander shift key input terminal L: shift L: reset L: bus on Reset signal output to the SONY bus interface (IC581) Serial data output to the SONY bus interface (IC581) Serial data input from the SONY bus interface (IC581) Serial data transfer clock signal output to the SONY bus interface (IC581) Serial data reading clock signal input for the SONY bus interface Not used (open) Input of acknowledge signal for the key entry Acknowledge signal is input to accept function and eject keys in the power off status On at input of H Front panel block remove/attach detection signal input terminal L: front panel is attached Battery detect signal input from the SONY bus interface (IC581) and battery detect circuit L is input at low voltage Sircs remote control signal input terminal Telephone muting signal input terminal Not used (fixed at L) Setting terminal for the test mode Not used (fixed at L) At input of H, the signal is attenuated by 20 dB Not used (open)

KEYIN0 D-BASS IN DSTSEL FUNC-SEL NCO RC-IN0 AVREF+ VDD OSC OUT OSC IN GND XT IN XT OUT GND RC-IN1 SYSRST BUS-ON UNISO UNISI UNICKO UNICKI NCO KEYACK NOSESW BU-IN SIRCS TEL-ATT TEST-IN RAMBU
I I I I O I I O I I O I O O O I O I O I I I I I I I
Bus on/off control signal output to the SONY bus interface (IC581)
L: test mode, Normally: fixed at H
Internal RAM reset detection signal input terminal Input terminal to check that RAM data are not destroyed due to low voltage This checking is made within 100 msec after reset Fixed at L in this set System reset signal input from the reset signal generator (IC551) and reset switch (S551) L: reset L is input for several 100 msec after power on, then it changes to H Muting control signal output to the electrical volume (IC331) Volume minimum: output (H active) Beep sound drive signal output terminal

RESET VOL-MUT BEEP

Pin No. 52
Pin Name AMP-MUT AMP ON PLL-CKO PLL-CE PLL-SO PLL-SI LCD-SO LCD-CE LCD-CKO VOL-SIO NCO VOL-CKO ACC-IN MUT NCO AMSON N/R-OUT
I/O O O O O O I O O O I/O O O I O O O O
Function Muting on/off control signal output to the power amplifier (IC751) Standby on/off control signal output to the power amplifier (IC751) L: standby mode, H: amp on PLL serial data transfer clock signal output to the FM/AM PLL (IC21) PLL chip enable signal output to the FM/AM PLL (IC21) PLL serial data output to the FM/AM PLL (IC21) PLL serial data input from the FM/AM PLL (IC21) Serial data output to the liquid crystal display driver (IC901) Chip enable signal output to the liquid crystal display driver (IC901) Two-way data bus with the electrical volume (IC331) Not used (open) Bus clock signal output to the electrical volume (IC331) Accessory detect signal input terminal Not used (open) Tape auto music sensor control signal output to the CXA2509AQ (IC301) L is output to lower the gain for audio level at FF/REW mode Forward/reverse direction control signal output to the CXA2509AQ (IC301) L: forward direction, H: reverse direction METAL control in/out terminal At initial mode: valid/invalid selection input of METAL function (valid at L input) At normal mode: METAL on/off control signal output terminal (METAL on at H output) Not used this function (fixed at H) Tape muting on/off control signal output to the CXA2509AQ (IC301) Active at ATA, FF/REW mode H: muting on L: accessory on H: muting on Audio line muting on/off control signal output terminal H active Serial data transfer clock signal output to the liquid crystal display driver (IC901) H active L: muting on

TAPE-MUT

Dolby control in/out terminal At initial mode: valid/invalid selection input of dolby function (valid at L input) At normal mode: dolby on/off control signal output terminal (dolby on at H output) Not used this function (fixed at H) Whether a music is present or not from CXA2509AQ (IC301) is detected at auto music sensor L: music is present, H: music is not present Not used (open) FM stereo broadcasting detection signal input from the FM/AM tuner unit (TU1), or forced monaural control signal output to the FM/AM tuner unit (TU1) L is input in the FM stereo mode, or L is output in the forced monaural mode Station detector detect input from the FM/AM tuner unit (TU1) Stop level for SEEK, BTM, etc. is determined SD is present at input of H Dial pulse input of the rotary encoder (RE900) (for VOLUME/BASS/TREBLE/BALANCE/FADER control) A/D converter power control signal output terminal When the KEYACK (pin @) that controls reference voltage power for key A/D conversion input is active, L is output from this terminal to enable the input Power select switch (S501) input terminal L: off (halt mode), H: on (operation mode) Power on/off control signal output of the illumination LED and liquid crystal display driver (IC901) H: power on Depends on initial setting of power select switch (S501) Power select switch (S501) on: H output at the accessory on Power select switch (S501) off: H output at the power on Rotation detect signal input from supply reel sensor and take-up reel sensor on the deck mechanism

to 75 76

AMSIN NCO ST-MONO

I O I/O

SD-IN RE-IN0 RE-IN1 AD-ON POWSEL

I I I O I

ILL-ON

Pin No. to 100

Pin Name POS3 POS2 POS0 POS1 LM-LOD LM-EJ TAPEON CM-ON POWON FM-ON TU-ON NCO
I/O I I I I O O O O O O O O Tape position (EJECT/FF/REW/ REV/FWD mode) detect input from the tape operation switch on the deck mechanism
Function POS3: L: REV and EJECT mode, H: others mode POS2: L: REW mode, H: others mode POS0: L: EJECT mode, H: others mode POS1: L: FF and FWD mode, H: others mode
Motor drive signal output to the loading/tape operation motor drive (IC351) H active (For the loading direction and forward side operation) *1 Motor drive signal output to the loading/tape operation motor drive (IC351) H active (For the eject direction and reverse side operation) *1 Tape system power supply on/off control signal output terminal H: tape on Capstan/reel motor (M901) drive signal output terminal H: motor on Main system power supply on/off control signal output to the BA3918 (IC611) H: power on FM system power supply on/off control signal output to the BA3918 (IC611) L: AM power on, H: FM power on Tuner system power supply on/off control signal output to the BA3918 (IC611) H: tuner power on Not used (open)

*1 Loading/tape operation motor control Mode Terminal LM-LOD (pin *) LM-EJ (pin *) STOP L L LOADING/ FORWARD H L EJECT/ REVERSE L H BRAKE H H