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CDC-R237 |
SERVICE MANUAL |
AEP Model |
Ver 1.0 2003. 02 |
UK Model |
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• The CD section have no adjustment. |
Model Name Using Similar Mechanism |
NEW |
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CD Drive Mechanism Type |
MG-930B-185 |
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Optical Pick-up Name |
OPTIMA-752B2 |
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RADIO SECTION
(FM)
Frequency Range: 87.5 MHz – 108 MHz Intermediate frequency: 10.7 MHz Usable Sensitivity: 12.7 dBf
50 dB Quieting Sensitivity: 17.2 dBf IF Rejection: 100 dB
Frequency Response: 30 Hz – 15,000 Hz S/N Ratio: 67 dB
Stereo Separation: 35 dB at 1 kHz Alternate Channel Selectivity: 98 dB Capture Ratio: 3 dB
(MW)
Frequency Range: 531 kHz – 1,602 kHz Intermediate frequency: 10.71 MHz/450 kHz Usable Sensitivity: 30 µV (30 dB)
(LW)
Frequency Range: 144 kHz – 288 kHz (1 kHz/9 kHz step) Intermediate frequency: 10.71 MHz/450 kHz
Usable Sensitivity: 30 µV (30 dB)
SPECIFICATIONS
CD SECTION
Frequency Response: 17 Hz – 20 kHz +0/–3 dB
Dynamic Range: More than 92 dB
Channel Separation: More than 60 dB
S/N Ratio: More than 92 dB
Wow/Flutter: Unmeasurable
AUDIO SECTION
Max. Power Output: 45 W × 4 channels
AUX Input
Input sensitivity (load impedance) AUX: 300 mV (10 kΩ)
– Continued on next page –
FM/MW/LW COMPACT DISC PLAYER
9-877-041-01 Sony Corporation
2003B0400-1 e Vehicle Company
© 2003. 02 |
Published by Sony Engineering Corporation |
1
CDC-R237
GENERAL
Power-Supply Voltage: 14.4 V (11 to 16 V allowable), DC, negative ground
Load Impedance: 4 Ω
Tone Control: Bass ±10 dB at 100 Hz, Treble ±10 dB at 10 kHz
Preamp Output Voltage (load impedance): 2.2 V (10 kΩ) Installed size: 182 (W) × 53 (H) × 155 (D) mm Supplied Accessory: Carrying case (1)
•Specifications and external appearance are subject to change without notice due to product improvement.
SERVICE NOTES
NOTES ON HANDLING THE OPTICAL PICK-UP BLOCK OR BASE UNIT
The laser diode in the optical pick-up block may suffer electrostatic breakdown because of the potential difference generated by the charged electrostatic load, etc. on clothing and the human body.
During repair, pay attention to electrostatic breakdown and also use the procedure in the printed matter which is included in the repair parts.
The flexible board is easily damaged and should be handled with care.
NOTES ON LASER DIODE EMISSION CHECK
The laser beam on this model is concentrated so as to be focused on the disc reflective surface by the objective lens in the optical pickup block. Therefore, when checking the laser diode emission, observe from more than 30 cm away from the objective lens.
Notes on Chip Component Replacement
•Never reuse a disconnected chip component.
•Notice that the minus side of a tantalum capacitor may be damaged by heat.
CAUTION
Use of controls or adjustments or performance of procedures other than those specified herein may result in hazardous radiation exposure.
This compact disc player is classified as a CLASS 1 LASER product. The CLASS 1 LASER PRODUCT label is located on the exterior.
SAFETY-RELATED COMPONENT WARNING!!
COMPONENTS IDENTIFIED BY MARK 0 OR DOTTED LINE WITH MARK 0 ON THE SCHEMATIC DIAGRAMS AND IN
THE PARTS LIST ARE CRITICAL TO SAFE OPERATION. REPLACE THESE COMPONENTS WITH SONY PARTS WHOSE PART NUMBERS APPEAR AS SHOWN IN THIS MANUAL OR IN SUPPLEMENTS PUBLISHED BY SONY.
2
CDC-R237
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TABLE OF CONTENTS |
1. GENERAL |
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Connections ............................................................................. |
4 |
2. DISASSEMBLY
2-1. |
Sub Panel Assy .................................................................... |
7 |
2-2. |
CD Mechanism Block ......................................................... |
7 |
2-3. |
Main Board Section ............................................................ |
8 |
2-4. |
Main Board ......................................................................... |
8 |
2-5. |
Heat Sink (CT) .................................................................... |
9 |
2-6. |
Sub Board ............................................................................ |
9 |
2-7. |
Servo Board ....................................................................... |
10 |
2-8. |
Floating Block Assy .......................................................... |
10 |
2-9. |
Lever Assy (CD Up Holder) .............................................. |
11 |
2-10. |
Lever (CD Roller) Sub Assy ............................................. |
11 |
2-11. |
Lever Assy (CD Holder) ................................................... |
12 |
2-12. |
Motor (Sled) Sub Assy ...................................................... |
12 |
2-13. |
Pick-up Sub Assy .............................................................. |
13 |
3. ELECTRICAL ADJUSTMENT .................................... |
14 |
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4. DIAGRAMS |
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4-1. |
IC Pin Descriptions ........................................................... |
15 |
4-2. |
Block Diagram –CD Section– ........................................... |
19 |
4-3. |
Block Diagram –Main Section– ........................................ |
20 |
4-4. |
Block Diagram –Front Section– ........................................ |
21 |
4-5. |
Circuit Boards Location .................................................... |
21 |
4-6. |
Printed Wiring Boards –CD Mechanism Section– ............ |
22 |
4-7. |
Schematic Diagram –CD Mechanism Section– ................ |
24 |
4-8. |
Printed Wiring Board –Main Section– .............................. |
25 |
4-9. |
Schematic Diagram –Main Section (1/2)– ........................ |
26 |
4-10. |
Schematic Diagram –Main Section (2/2)– ........................ |
27 |
4-11. |
Printed Wiring Boards –Front Section– ............................ |
28 |
4-12. |
Schematic Diagram –Front Section– ................................ |
29 |
4-13. |
IC Block Diagrams ............................................................ |
30 |
5. EXPLODED VIEWS |
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5-1. |
Chassis Section ................................................................. |
32 |
5-2. |
Front panel Section ........................................................... |
33 |
5-3. |
CD Mechanism Section (1) ............................................... |
34 |
5-4. |
CD Mechanism Section (2) ............................................... |
35 |
6. ELECTRICAL PARTS LIST ........................................ |
36 |
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3
CDC-R237
SECTION 1
GENERAL
This section is extracted from instruction manual.
4
CDC-R237
5
CDC-R237
SECTION 2
DISASSEMBLY
Note : This set can be disassemble according to the following sequence.
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2-1. SUB PANEL ASSY |
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(Page 7) |
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2-2. CD MECHANISM BLOCK |
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(Page 7) |
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2-3. |
MAIN BOARD SECTION |
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2-6. |
SUB BOARD |
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(Page 8) |
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(Page 9) |
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2-4. |
MAIN BOARD |
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2-7. |
SERVO BOARD |
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2-13. PICK-UP SUB ASSY |
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(Page 8) |
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(Page 10) |
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(Page 13) |
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2-5. |
HEAT SINK (CT) |
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(Page 9) |
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2-8. |
FLOATING BLOCK ASSY |
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(Page 10) |
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2-9. LEVER ASSY (CD UP HOLDER) (Page 11)
2-10. LEVER (CD ROLLER) SUB SSY (Page 11)
2-11. LEVER ASSY (CD HOLDER) (Page 12)
2-12. MOTOR (SLED) SUB ASSY (Page 12)
6
CDC-R237
Note : Follow the disassembly procedure in the numerical order given.
2-1. SUB PANEL ASSY
3 claws
2 claws
1 B 2.6x6
4 sub panel assy
2-2. CD MECHANISM BLOCK
2 PTT 2.6x6
4 P 2.6x4
6 CD mechanism block
1 PTT 2.6x6
5 holder (CD mecha)
3 CON701
7
CDC-R237
2-3. MAIN BOARD SECTION
6 Removal the solder.
7 MAIN board section
4 Removal the solder.
5 Removal the solder.
1 PTP 2.6x4
3 insulation sheet
2 cover
2-4. MAIN BOARD
6 side chassis (L)
1 PTT 2.6x6
4 PTT 2.6x6
5 PTT 2.6x6 |
0 MAIN board |
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2 PTT 2.6x6
9 front chassis
7 PTT 2.6x6
3 PTT 2.6x6
8 side chassis (R)
8
CDC-R237
2-5. HEAT SINK (CT)
1 screw (2.6x8)
2 P 3x12
3 PTT 2.6x8
4 heat sink (CT)
2-6. SUB BOARD
2 P 1.4x2
3 SUB board
1 Removal the solders.
green yellow orange
9
CDC-R237
2-7. SERVO BOARD
5 PIC2 FLEXIBLE board
1
blue
Removal the solders. orange brawn red
red
black
green
yellow
4 SERVO board
2 PTT 2x3
3 screws (M1.7x5)
2-8. FLOATING BLOCK ASSY
2 tension spring
qd floating block aasy
1 tension spring
3 tension spring
8 claw
4 tension spring
qs oil damper
9
0
5 tension spring
7 claw
qa oil damper
6 claw
10
CDC-R237
2-9. LEVER ASSY (CD UP HOLDER)
1 P 1.4x2
5 lever assy (CD up holder)
2 leaf spring (roller)
4 tension spring
3 special screw
2-10. LEVER (CD ROLLER) SUB ASSY
3 lever (CD roller) sub assy
2
1
11
CDC-R237
2-11. LEVER ASSY (CD HOLDER)
4 lever assy (CD holder)
3
2 special screw
1 torsion spring
2-12. MOTOR (SLED) SUB ASSY
1 P 1.7x2
2 motor (sled) sub assy
12
CDC-R237
2-13. PICK-UP SUB ASSY
1 B 1.4x5
2 leaf spring
3 pick-up sub assy
13
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