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Sony XR-4950X Service Manual
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Sony XR-4950X Service Manual

Sony XR-4950X Service Manual

Fm/am cassette car stereo
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SERVICE MANUAL
Ver 1.0 2001.04
Cassette player section
Tape track
Wow and flutter
Frequency response
Signal-to-noise ratio
Tuner section
FM
Tuning range
Aerial terminal
Intermediate frequency
Usable sensitivity
Selectivity
Signal-to-noise ratio
Harmonic distortion at 1 kHz
Separation
Frequency response
AM
Tuning range
Aerial terminal
Intermediate frequency
Sensitivity
Power amplifier section
Outputs
Speaker impedance
Maximum power output 50 W × 4 (at 4 ohms)
Sony Corporation
9-873-510-11
2001D0500-1
e Vehicle Company
C 2001.4
Shinagawa Tec Service Manual Production Group
SPECIFICATIONS
4-track 2-channel stereo
0.08 % (WRMS)
30 – 18,000 Hz
58 dB
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)
0.6 % (stereo),
0.3 % (mono)
35 dB at 1 kHz
30 – 15,000 Hz
531 – 1,602 kHz
External aerial connector
10.7 MHz/450 kHz
30 µV
Speaker outputs
(sure seal connectors)
4 – 8 ohms
XR-4950X
Model Name Using Similar Mechanism
Tape Transport Mechanism Type
General
Outputs
Audio output
Power aerial relay control
lead
Power amplifier control
lead
Telephone ATT control
lead
Bass ±9 dB at 100 Hz
Tone controls
Treble ±9 dB at 10 kHz
Power requirements
12 V DC car battery
(negative earth)
Approx. 178 × 50 × 183 mm
Dimensions
(w/h/d)
Approx. 182 × 53 × 162 mm
Mounting dimensions
(w/h/d)
Mass
Approx. 1.2 kg
Supplied accessories
Parts for installation and
connections (1 set)
Front panel case (1)
Design and specifications are subject to change
without notice.
FM/AM CASSETTE CAR STEREO
AEP Model
NEW
MG-25F-136

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Summary of Contents for Sony XR-4950X

  • Page 1 XR-4950X SERVICE MANUAL AEP Model Ver 1.0 2001.04 Model Name Using Similar Mechanism Tape Transport Mechanism Type MG-25F-136 SPECIFICATIONS Cassette player section General Tape track 4-track 2-channel stereo Outputs Audio output Wow and flutter 0.08 % (WRMS) Power aerial relay control Frequency response 30 –...
  • Page 2 XR-4950X 6-3. SCHEMATIC DIAGRAM – MAIN Board (1/2) – • • See page 15 for Waveforms. See page 21 for IC Block Diagrams. (Page 19)
  • Page 3 XR-4950X 6-4. SCHEMATIC DIAGRAM – MAIN Board (2/2) – • See page 21 for IC Block Diagrams. (Page (Page 18)
  • Page 4 XR-4950X 6-5. PRINTED WIRING BOARD – SUB Board – 6-6. SCHEMATIC DIAGRAM – SUB Board – LED801 K1 S2 K2 A1 S1 A2 LSW801 (Page 23) (Page 19) (Page 17) (Page 22)
  • Page 5 XR-4950X • IC Block Diagrams – MAIN Board – IC301 CXA2509AQ-T4 IC351 LB1930M-TLM IC331 TDA7402TR BUFFER 33 32 31 24 23 OUT1 MOTOR CONTROL DRIVE CIRCUIT MIXER CIRCUIT 24dB OUT2 120µ/70µ BUFFER MONO- MONO- MONO- MONO- MONO- MONO- + –...
  • Page 6 XR-4950X 6-8. SCHEMATIC DIAGRAM – KEY Board – • See page 15 for Waveform. (Page...

  • Page 7: Ic Pin Function Description

    XR-4950X 6-9. IC PIN FUNCTION DESCRIPTION • MAIN BOARD IC501 MN101C49KTA2 (SYSTEM CONTROLLER) Pin No. Pin Name Description Pin No. Pin Name Description VREF Reference voltage (0V) input terminal (for A/D converter) ACC IN Accessory detection signal input “L”: accessory on...
  • Page 8 XR-4950X Pin No. Pin Name Description Rotation detection signal input from supply reel sensor and take-up reel sensor on the deck mechanism POS3 Tape position (EJECT/FF/REW/ POS0: “L”: EJECT mode, “H”: others mode POS2 REV/FWD mode) detection signal POS1: “L”: FF and FWD mode, “H”: others mode input from the tape operation switch POS2: “L”: REW mode, “H”: others mode...