Aiwa CDC-R237 Service manual
CDC-R237
SERVICE MANUAL
Ver 1.0 2003. 02
• The CD section have no adjustment.
SPECIFICATIONS
AEP Model
UK Model
Model Name Using Similar Mechanism NEW
CD Drive Mechanism Type MG-930B-185
Optical Pick-up Name OPTIMA-752B2
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)
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 –
9-877-041-01
2003B0400-1
© 2003. 02
FM/MW/LW COMPACT DISC PLAYER
Sony Corporation
e Vehicle Company
Published by Sony Engineering Corporation
1
CDC-R237
GENERAL
Power-Supply Voltage: 14.4 V (11 to 16 V allowable),
Load Impedance: 4 Ω
Tone Control: Bass ±10 dB at 100 Hz,
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.
DC, negative ground
Treble ±10 dB at 10 kHz
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 dam-
aged 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 P ARTS WHOSE
PART NUMBERS APPEAR AS SHOWN IN THIS MANUAL OR
IN SUPPLEMENTS PUBLISHED BY SONY.
2
TABLE OF CONTENTS
1. GENERAL
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
CDC-R237
4. DIAGRAMS
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
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
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.
SET
2-1. SUB PANEL ASSY
(Page 7)
2-2. CD MECHANISM BLOCK
(Page 7)
2-3. MAIN BOARD SECTION
(Page 8)
2-4. MAIN BOARD
(Page 8)
2-5. HEAT SINK (CT)
(Page 9)
2-6. SUB BOARD
(Page 9)
2-7. SERVO BOARD
(Page 10)
2-8. FLOATING BLOCK ASSY
(Page 10)
2-9. LEVER ASSY (CD UP HOLDER)
(Page 11)
2-10. LEVER (CD ROLLER) SUB SSY
(Page 11)
2-13. PICK-UP SUB ASSY
(Page 13)
2-11. LEVER ASSY (CD HOLDER)
(Page 12)
2-12. MOTOR (SLED) SUB ASSY
(Page 12)
6
Note : Follow the disassembly procedure in the numerical order given.
)
2-1. SUB PANEL ASSY
3
claws
2
CDC-R237
claws
1
B 2.6x6
2-2. CD MECHANISM BLOCK
6
CD mechanism block
2
PTT 2.6x6
4
sub panel assy
4
P 2.6x4
1
PTT 2.6x6
5
holder (CD mecha
3
CON701
7
CDC-R237
6
2-3. MAIN BOARD SECTION
6
Removal the solder.
7
MAIN board section
4
Removal the solder.
5
Removal the solder.
2-4. MAIN BOARD
5
PTT 2.6x6
4
PTT 2.6x6
6
side chassis (L)
1
PTT 2.6x6
1
PTP 2.6x4
3
2
cover
0
MAIN board
insulation sheet
2
PTT 2.6x
9
front chassis
7
PTT 2.6x6
3
PTT 2.6x6
8
side chassis (R)
8
2-5. HEAT SINK (CT)
8
1
screw (2.6x8)
2
P 3x12
3
4
heat sink (CT)
CDC-R237
PTT 2.6x
2-6. SUB BOARD
1
Removal the solders.
green
yellow
orange
2
P 1.4x2
3
SUB board
9
CDC-R237
2-7. SERVO BOARD
5
PIC2 FLEXIBLE board
1
Removal the solders.
orange
blue
brawn
red
2
PTT 2x3
2-8. FLOATING BLOCK ASSY
1
tension spring
4
SERVO board
3
screws (M1.7x5)
2
tension spring
red
yellow
qd
floating block aasy
black
green
3
tension spring
10
8
qs
oil damper
claw
0
9
7
claw
qa
4
tension spring
5
tension spring
oil damper
6
claw
2-9. LEVER ASSY (CD UP HOLDER)
w
1
P 1.4x2
2
leaf spring (roller)
5
lever assy (CD up holder)
4
tension spring
3
special scre
CDC-R237
2-10. LEVER (CD ROLLER) SUB ASSY
1
2
3
lever (CD roller) sub assy
11
CDC-R237
y
2-11. LEVER ASSY (CD HOLDER)
3
4
lever assy (CD holder)
2
special screw
2-12. MOTOR (SLED) SUB ASSY
1
torsion spring
1
P 1.7x2
12
2
motor (sled) sub ass
2-13. PICK-UP SUB ASSY
1
B 1.4x5
2
leaf spring
3
pick-up sub assy
CDC-R237
13
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