XR-4950X

SERVICE MANUAL

Ver 1.0 2001.04

AEP Model
Model Name Using Similar Mechanism Tape Transport Mechanism Type

NEW MG-25F-136

SPECIFICATIONS

Cassette player section

Tape track Wow and flutter Frequency response Signal-to-noise ratio 4-track 2-channel stereo 0.08 % (WRMS) 30 18,000 Hz 58 dB

General

Outputs Audio output Power aerial relay control lead Power amplifier control lead Telephone ATT control lead Bass 9 dB at 100 Hz Treble 9 dB at 10 kHz 12 V DC car battery (negative earth) Approx. 183 mm (w/h/d) Approx. 162 mm (w/h/d) Approx. 1.2 kg Parts for installation and connections (1 set) Front panel case (1)

Tuner section

Tuning range Aerial terminal Intermediate frequency Usable sensitivity Selectivity Signal-to-noise ratio 87.5 108.0 MHz External aerial connector 10.7 MHz/450kHz 8 dBf 75 dB at 400 kHz 66 dB (stereo), 72 dB (mono) Harmonic distortion at 1 kHz 0.6 % (stereo), 0.3 % (mono) Separation 35 dB at 1 kHz Frequency response 30 15,000 Hz
Tone controls Power requirements Dimensions Mounting dimensions Mass Supplied accessories
Tuning range Aerial terminal Intermediate frequency Sensitivity 531 1,602 kHz External aerial connector 10.7 MHz/450 kHz 30 V
Design and specifications are subject to change without notice.

Power amplifier section

Outputs Speaker outputs (sure seal connectors) Speaker impedance ohms Maximum power output 50 W 4 (at 4 ohms)
FM/AM CASSETTE CAR STEREO

9-873-510-11

2001D0500-1 C 2001.4

Sony Corporation

e Vehicle Company Shinagawa Tec Service Manual Production Group
SCHEMATIC DIAGRAM MAIN Board (1/2)
See page 15 for Waveforms.
See page 21 for IC Block Diagrams.

(Page 19)

SCHEMATIC DIAGRAM MAIN Board (2/2)

(Page 18)

(Page 20)
6-5. PRINTED WIRING BOARD SUB Board 6-6. SCHEMATIC DIAGRAM SUB Board

LED801

K1 S2 K2

LSW801

A1 S1 A2

(Page 23)

(Page 17)

(Page 22)

IC Block Diagrams MAIN Board IC331 TDA7402TR
OUTSWR OUTSWL OUTSSL OUTSSR ACINLR ACINRF ACINRR OUTRR OUTLR OUTRF OUTLF

CXA2509AQ-T4

LINEOUT2 TAPEIN2

LB1930M-TLM

PBOUT2

AUXIN2

29 MIXER

VCC 1 NC 2 ININ2 4

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

21 24dB

120/70
MONO- MONOFADER FADER ACINLF 34 SWINR 35 SWINL 36 ACOUTR 37 ACOUTL 38 CREF 39 FRONT ACIN OUTPUT SELECTOR MAIN SECOND REAR SW MONO- MONOFADER FADER MONO- MONOFADER FADER

+ 20 MSMODE NR BIAS

S-GND 5

MS MODE

SUBWOOFER +PHASE CONTROL

PBFBPBRINPBREFPBFINF2

X1 TAPE/AUX TAPE EQ FWD/RVS
19 DRSW 18 TAPESW 17 INSW 16 NC

VCT 35 PBGND 36

LP VOICE BANDPASS HP 22 VDD

IIC-BUS

VCT + LPF

VCC + F3 X1

MS ON/ 15 NC OFF DETECT 14 MSOUT

21 SCL 20 SDA

PBFINPBREFPBRINPBFBT1 + F1

13 DGND

BASS SUPPLY TREBLE

DIGITAL CONTROL

12 MSTC + 120/70 24dB 6

19 GND 18 SM

11 G1FB

HIGH-CUT

VOLUME

S&H

PULSE FORMER QUAL 17 QUAL

PBOUT1

TAPEIN1 AUXIN1

LINEOUT1

SOFTMUTE COMPANDER LOUDNESS LOUDNESS

25kHz LP

MUX 40

IN-GAIN +AUTO ZERO

IN-GAIN BEEP MUTE
DEMODULATOR +STEREO ADJUST +STEREO BLAND

MULTIPATH DETECTOR

16 MPOUT 15 MPIN
PILOT CANCELATION PIL DET

D/A CONVERTER

14 LEVEL

BA4908-V3

MAIN SOURCE SELECTOR MDMD1G 42 MDMD2G 44 MAIN

MIXING SELECTOR

SECOND SOURCE SELECTOR PLL 80kHz LP
INPUT MULTIPLEXER PHONO MAIN 1 2

SEL SER

13 MPX

REGULATOR

FM AUX AM 11

FD1L+ FD1L FD1R+ FD1R

AM/FM NOISE BLANKER

12 AMIF

FD2L+ FD2L FD2R+ FD2R
OVER VOLTAGE PROTECT + 11

TUNER8.7V

TUNER8.7 ANT SW TUNER5.6 SW STB

VDD5.6V

COM8.7V

TUNER5.6V

SCHEMATIC DIAGRAM KEY Board
See page 15 for Waveform.
6-9. IC PIN FUNCTION DESCRIPTION
MAIN BOARD IC501 MN101C49KTA2 (SYSTEM CONTROLLER) Pin No. Pin Name VREF VSM FMAGC KEYIN1 I/O I I I I Description 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) FM AGC level detection signal input from the FM/AM tuner unit (TU1) (A/D input) Key input terminal (A/D input) (LSW801, LSW909, LSW912 to LSW917) Z, D-BASS, 6, 5, 4, 3, 2, REP 1 keys input Key input terminal (A/D input) (LSW901 to LSW907, S901 to S904) OFF, SOURCE, SOUND, MENU, MODE o, ENTER, SEEK/AMS . m,PRST +, SEEK/AMS + > M, PRST keys input Destination setting terminal (fixed at H in this set) Rotary remote commander key input terminal (A/D input) Noise level detection signal input at SEEK mode (A/D input) Not used (open) Reference voltage (+5V) input terminal (for A/D converter) Power supply terminal (+5V) (for A/D converter) Main system clock output terminal (18.432 MHz) Main system clock input terminal (18.432 MHz) Ground terminal (for A/D converter) Sub system clock input terminal (32.768 kHz) Sub system clock output terminal (32.768 kHz) Not used (fixed at L) Front panel block remove/attach detection signal input L: front panel is attached, H: front panel is removed Bus on/off control signal output terminal Reset signal output terminal L: reset L: bus on Not used (fixed at H) 55 H active 56 DOLON I/O TAPATT O Not used (fixed at H) 54 MTLON I/O 53 NROUT O 52 AMSON O 51 AMPATT ATT TU ATT O O O Not used (open) Pin No. 48 Pin Name ACC IN TESTIN TELATT UNICLI UNISO UNISI UNICKO I2C SIO VOLATT I2C CKO AMPON I/O I I I I O I O I/O O O O Description Accessory detection signal input L: accessory on Setting terminal for the test mode H: test mode, Normally: fixed at L Telephone muting signal input terminal At input of H, the signal is attenuated by 20 dB Serial data transfer clock signal input terminal Not used (fixed at L) Serial data output terminal Not used (fixed at L) Serial data input terminal Not used (fixed at L) Serial data transfer clock signal output terminal Not used (fixed at L) Two-way data bus with the electrical volume (IC331) and FM/AM tuner unit (TU1) Muting on/off control signal output to the electrical volume (IC331) L: muting on Clock signal output to the electrical volume (IC331) and FM/AM tuner unit (TU1) Standby on/off control signal output to the power amplifier (IC751) L: standby mode, H: amplifier on Muting on/off control signal output to the power amplifier (IC751) L: muting on Audio line muting on/off control signal output H: muting on Muting on/off control signal output of the FM and AM tuner signal H: muting on 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: auto/manual mode selection input of METAL function (manual at L input) At manual mode: METAL on/off control signal output terminal (METAL on at H output) At auto mode: input at MTLIN (pin es) Tape muting on/off control signal output to the CXA2509AQ (IC301) H: muting on Active at ATA, FF/REW mode 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 4VPREOUT model setting terminal L: 4VPREOUT model Fixed at H in this set Not used (open) Two-way data bus with the FM/AM tuner unit (TU1) Clock signal output to the FM/AM tuner unit (TU1) Not used (open) AM filter control signal output to the FM/AM tuner unit (TU1) L: SW mode Front panel open/close detection signal input L is input when the front panel is closed LED drive signal output of the tape window and Z indicator (LED801, LSW801) H: LED on H is output to turn on LED when front panel is opened Dial pulse input of the rotary encoder (RE901) (for volume control) A/D converter power control signal output When the KEYACK (pin wh) that controls reference voltage power for key A/D conversion input is active, L is output from this terminal to enable the input Power on/off control signal output of the illumination LED and liquid crystal display driver (IC901) H: power on

KEYIN0 DSTSEL RCIN0 QUALITY VREF VDD OSCOUT OSCIN VSS XIN XOUT MMOD NOSESW BUSON SYSRST LCDSO LCDCE LCDCKO RCIN1 RAMBU
I I I I O I O I I O I I O O O O O I I
Serial data output to the liquid crystal display driver (IC901) Chip enable signal output to the liquid crystal display driver (IC901) Rotary remote commander shift key input terminal L: shift 59 to 75 L is input at low voltage 78 H: auto metal Not used (fixed at L) DOORIND REIN1 REIN0 AD ON O I I O Not used (fixed at L) AMSIN 4VPRE E2P SIO E2P CKO SWSHIFT DOORSW I I O I/O O O O I Serial data transfer clock signal output to the liquid crystal display driver (IC901) 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 50 msec after reset Not used (fixed at L) 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 Not used (open) Battery detect signal input from the battery detect circuit Sircs remote control signal input terminal Not used (open) Auto metal detection signal input terminal 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 Tuner system power supply on/off control signal output to the BA4908 (IC611) H: tuner power on Beep sound drive signal output to the power amplifier (IC751) Main system power supply on/off control signal output to the BA4908 (IC611) H: power on Setting terminal for the illumination color L: amber, H: green Fixed at L in this set 83 ILLON O

30, 37

KEYACK BUIN SIRCS MTLIN RESET TUNON BEEP PW ON COLSEL

I O I I O I I O O O I

Pin No. 92 93, to 99 100
Pin Name REL POS3 POS2 POS0 POS1 LMLOD LMEJ TAPON CMON DAVSS NS MASK DAVDD
I/O I I I I I O O O O O O O
Description Rotation detection signal input from supply reel sensor and take-up reel sensor on the deck mechanism Tape position (EJECT/FF/REW/ REV/FWD mode) detection signal input from the tape operation switch on the deck mechanism POS0: L: EJECT mode, H: others mode POS1: L: FF and FWD mode, H: others mode POS2: L: REW mode, H: others mode POS3: L: REV and EJECT mode, H: others mode
Motor drive signal output to the loading/tape operation motor driver (IC351) H active (For the loading direction and forward side operation) *1 Motor drive signal output to the loading/tape operation motor driver (IC351) H active (For the eject direction and reverse side operation) *1 Tape system power supply on/off control signal output H: tape on Capstan/reel motor (M901) drive signal output H: motor on Not used (open) Ground terminal (for D/A converter) Not used (open) Discharge control signal output terminal H: discharge Not used (open) Not used (open) Power supply terminal (+5V) (for D/A converter) Not used (open)

*1 Loading/tape operation motor control Mode Terminal LMLOD (pin il) LMEJ (pin o;) STOP L L LOADING/ FORWARD H L EJECT/ REVERSE L H BRAKE H H