Sony MDX-CA680 User Manual

SERVICE MANUAL
FM/AM (MW/LW) MINIDISC PLAYER
US Model
MDX-CA680X
AEP Model
UK Model
MDX-CA680/CA680X
SPECIFICATIONS
MDX-CA680/CA680X
Photo: MDX-CA680X (US model)
Ver 1.1 2001.05
9-870-242-12 Sony Corporation
2001E0500-1 e Vehicle Company
C 2001.5 Shinagawa Tec Service Manual Production Group
U.S. and foreign patents licensed from Dolby laboratories
Licensing Corporation.
AUDIO POWER SPECIFICATIONS (US model)
POWER OUTPUT AND TOTAL HARMONIC DISTORTION
23 watts per channel minimum continuous average power into 4 ohms,
4 channels driven from 20 Hz to 20 kHz with no more than 5% total
harmonic distortion.
MD Player section
Signal-to-noise ratio 90 dB
Frequency response 10 – 20,000 Hz
Wow and flutter Below measurable limit
Laser Diode Properties (US model)
Material GaAlAs
Wavelength 780 nm
Emission Duration Continuous
Laser output power Less than 44.6 µW*
* This output is the value measured at a distance of
200 mm from the objective lens surface on the
Optical Pick-up Block.
Tuner section
FM
T
US model:
AEP, UK models:
uning range
87.5 – 107.9 MHz
87.5 – 108.0 MHz
Antenna terminal External antenna connector
Intermediate frequency 10.7 MHz/450 kHz
Usable sensitivity 8 dBf
Selectivity 75 dB at 400 kHz
Signal-to-noise ratio 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
AM (US model)
Tuning range 530 – 1,710 kHz
Antenna terminal External antenna connector
Intermediate frequency 10.7 MHz/450 kHz
Sensitivity 30 µV
Power amplifier section
Outputs Speaker outputs
(sure seal connectors)
Speaker impedance 4 – 8 ohms
Maximum power output 50 W
× 4 (at 4 ohms)
General
Outputs Audio outputs (front/rear)
Power antenna relay control
lead
Power amplifier control lead
Inputs Telephone ATT control lead
BUS control input
connector
BUS audio input connector
Remote controller input
connector
Antenna input connectorT
US model:
one controls
Bass
±10 dB at 100 Hz
Treble ±10 dB at 15 kHz
AEP, UK models: Bass ±9 dB at 100 Hz
Treble ±9 dB at 10 kHz
Power requirements 12 V DC car battery
(negative ground)
Dimensions Approx. 178
× 50 × 177 mm
(7
1
/
8 ×
2
×
7 in.)
(w/h/d)
Mounting dimensions Approx. 182
× 53 × 161 mm
(7
1
/4 × 2
1
/8 × 6
3
/8 in.)
(w/h/d)
Mass Approx. 1.2 kg
(2 lb 10 oz)
Supplied accessories Parts for installation and
connections (1 set)
Front panel case (1)
Note
This unit cannot be connected to a digital preamplifier
or an equalizer.
Design and specifications are subject to change
without notice.
MW/LW (AEP, UK models)
Tuning range MW: 531 – 1,602 kHz
LW: 153 – 279 kHz
Aerial terminal External aerial connector
Intermediate frequency 10.7 MHz/450 kHz
Sensitivity MW: 30 µV
LW: 40 µV
Model Name Using Similar Mechanism NEW
Base Mechanism Type MG-164MA-138
Optical Pick-up Name KMS-241C

Sony MDX-CA680 Specifications

General

CD Playback	Yes
CD-R/RW Playback	Yes
MP3 Playback	Yes
USB Port	No
Bluetooth	No
Equalizer	Yes
Built-in DSP	No
Display Type	LCD
Remote Control	Yes
Channels	4
Tuner	AM/FM
Playback Media	CD, CD-R, CD-RW

Summary

SPECIFICATIONS

AUDIO POWER SPECIFICATIONS (US model)

Details power output and total harmonic distortion for US models.

GENERAL SAFETY AND HANDLING NOTES

Handling the Optical Pick-up Block

Precautions for preventing electrostatic breakdown of the optical pick-up.

Laser Diode Emission Check

Safety warning regarding direct viewing of the laser diode emission.

Flexible Circuit Board Repair

Cautionary Notes

General caution against using controls or procedures other than specified.

Safety-Related Component Warning

Warning to use specific SONY parts for safety-critical components.

SECTION 2 DISASSEMBLY

2-1. DISASSEMBLY FLOW

Overview of the disassembly sequence and notes on process order.

SECTION 3 ELECTRICAL ADJUSTMENTS

TEST MODE

Procedure for setting and releasing the unit's test mode function.

SECTION 4 DIAGRAMS

SERVO Board IC Block Diagrams

4-1. BLOCK DIAGRAM – SERVO Section –

Overall block diagram of the servo signal path.

4-2. BLOCK DIAGRAM – TUNER Section –

Block diagram illustrating the tuner signal processing.

4-3. BLOCK DIAGRAM – MAIN Section –

Block diagram showing the main functional blocks of the unit.

4-4. BLOCK DIAGRAM – BUS CONTROL/POWER SUPPLY Section –

Block diagram of the bus control and power supply systems.

4-5. NOTE FOR PRINTED WIRING BOARDS AND SCHEMATIC DIAGRAMS

4-6. PRINTED WIRING BOARDS SERVO Section –

4-7. SCHEMATIC DIAGRAM – SERVO Section (1/2) –

Schematic diagram for the servo section, part one.

4-8. SCHEMATIC DIAGRAM – SERVO Section (2/2) –

Schematic diagram for the servo section, part two.

4-9. PRINTED WIRING BOARD – MAIN Board –

4-10. SCHEMATIC DIAGRAM – MAIN Board (1/3) –

Schematic diagram for the main board, part one.

4-11. SCHEMATIC DIAGRAM – MAIN Board (2/3) –

Schematic diagram for the main board, part two.

4-12. SCHEMATIC DIAGRAM – MAIN Board (3/3) –

Schematic diagram for the main board, part three.

4-13. PRINTED WIRING BOARD – SUB Board –

4-14. SCHEMATIC DIAGRAM – SUB Board –

4-15. PRINTED WIRING BOARD – KEY Board –

4-16. SCHEMATIC DIAGRAM – KEY Board –

Waveforms

Illustrations and descriptions of key waveforms for testing.

4-17. IC PIN FUNCTION DESCRIPTION

Detailed pin function descriptions for various ICs on the servo board.

SECTION 5 EXPLODED VIEWS

5-1. GENERAL SECTION

5-2. FRONT PANEL SECTION

5-3. MECHANISM DECK SECTION-1 (MG-164MA-138)

5-4. MECHANISM DECK SECTION-2 (MG-164MA-138)

SECTION 6 ELECTRICAL PARTS LIST