Aiwa CDC-R237 Service Manual

Aiwa CDC-R237 Service Manual

Fm/mw/lw compact disc player

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SERVICE MANUAL
Ver 1.0 2003. 02
• The CD section have no adjustment.
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)
Sony Corporation
9-877-041-01
2003B0400-1
e Vehicle Company
© 2003. 02
Published by Sony Engineering Corporation
CDC-R237
Model Name Using Similar Mechanism
CD Drive Mechanism Type
Optical Pick-up Name
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)
FM/MW/LW COMPACT DISC PLAYER
AEP Model
UK Model
NEW
MG-930B-185
OPTIMA-752B2
– Continued on next page –
1

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Summary of Contents for Aiwa CDC-R237

  • Page 1 Frequency Range: 144 kHz – 288 kHz (1 kHz/9 kHz step) Intermediate frequency: 10.71 MHz/450 kHz Usable Sensitivity: 30 µV (30 dB) FM/MW/LW COMPACT DISC PLAYER Sony Corporation 9-877-041-01 2003B0400-1 e Vehicle Company © 2003. 02 Published by Sony Engineering Corporation...
  • Page 2 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.
  • Page 3: Table Of Contents

    CDC-R237 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.
  • Page 4 CDC-R237 SECTION 1 GENERAL This section is extracted from instruction manual.
  • Page 5 CDC-R237...
  • Page 6: Disassembly

    CDC-R237 SECTION 2 DISASSEMBLY Note : This set can be disassemble according to the following sequence. 2-1. SUB PANEL ASSY (Page 7) 2-2. CD MECHANISM BLOCK (Page 7) 2-3. MAIN BOARD SECTION 2-6. SUB BOARD (Page 8) (Page 9) 2-7.
  • Page 7: Sub Panel Assy

    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...
  • Page 8: Main Board Section

    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...
  • Page 9: Heat Sink (Ct)

    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...
  • Page 10: Servo Board

    CDC-R237 2-7. SERVO BOARD 5 PIC2 FLEXIBLE board 1 Removal the solders. 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...
  • Page 11: Lever Assy (Cd Up Holder)

    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...
  • Page 12: Lever Assy (Cd Holder)

    CDC-R237 2-11. LEVER ASSY (CD HOLDER) 4 lever assy (CD holder) 2 special screw 1 torsion spring 2-12. MOTOR (SLED) SUB ASSY 1 P 1.7x2 2 motor (sled) sub assy...
  • Page 13: Pick-Up Sub Assy

    CDC-R237 2-13. PICK-UP SUB ASSY 1 B 1.4x5 2 leaf spring 3 pick-up sub assy...
  • Page 14: Electrical Adjustment

    CDC-R237 SECTION 3 ELECTRICAL ADJUSTMENT RDS Adjustment Setting: 98 MHz 31 dBµV (EMF) 1 kHz (Modulation Frequency) 45 kHz DEV Check point: S.METER test point Adjustment location: SFR101 Specification: 2.0±0.1 V Procedure: Set to FM98.0 MHz and adjust SFR101 so that the test point is 2.0±0.2 V.
  • Page 15: Diagrams

    CDC-R237 SECTION 4 DIAGRAMS 4-1. IC PIN DESCRIPTIONS • IC241 TC94A09F-303 (DIGITAL SIGNAL SERVO PROCESSOR) (SERVO BOARD) Pin No. Pin Name Pin Description 1 – 9 S1 – 9 (OT5 – 13) LCD segment signal output/Output port Not used. (Open) S10 (OT14/ZDET) LCD segment signal output/Output port/CD signal Not used.
  • Page 16 CDC-R237 Pin No. Pin Name Pin Description RFZI RFRP zero-closs signal input RFRP RFRP ripple signal input Focus error signal input SBAD Sub beam addition signal input Tracking error signal input TEZI Tracking error zero-closs signal input Focus equalizer signal output...
  • Page 17 CDC-R237 • IC901 µPD178078GF-589-3BA (SYSTEM CONTROL) (MAIN BOARD) Pin No. Pin Name Pin Description BATT IN Battery signal input DFP IN Front panel with/without detect signal input LCD DI LCD serial data signal input LCD DO LCD serial data signal output...
  • Page 18 CDC-R237 Pin No. Pin Name Pin Description AF MUTE Audio mute control signal output 61 – 63 Not used. (Open) RDS MODE RDS mode signal output “H”: RDS AF POWER MUTE Mute control signal output to power IC Band (FM) select signal output Band (AM) select signal output 68 –...
  • Page 19: Block Diagram -Cd Section

    CDC-R237 4-2. BLOCK DIAGRAM — CD SECTION — RF AMP DIGITAL SIGNAL SERVO PROCESSOR IC221 IC241 OPTICAL PICK-UP RFGO BLOCK CD L RFRPIN RFZI RFCT RFCT CD R RFRP 61 RFRP SBAD SBAD TEZI RESET RESET TEBC CDS CS CLOCK...
  • Page 20: Block Diagram -Main Section

    CDC-R237 4-3. BLOCK DIAGRAM — MAIN SECTION — ELECTRONIC VOLUME AUX-RCH J601 IC401 J401 AUX(L) LROUT ANT101 TUN(L) AUDIO OUT VOL/ FADER (ANTENNA) LFOUT AMANT REAR CD(L) TONE R-CH POWER AMP 2 FMANT TUN-RCH MUTE MUTE IC501 CON851 Q403 Q401...
  • Page 21: Block Diagram -Front Section

    CDC-R237 4-4. BLOCK DIAGRAM — FRONT SECTION — 4-5. CIRCUIT BOARDS LOCATION LCD DRIVER SERVO board IC601 SUB board VDD(+5V) DFP IN KS1/S40 • LCD DI LCD601 KS1/S41 LCD CLO LIQUID CRYSTAL LCD CE COM1-4 DISPLAY LCD DO EJECT MAIN...
  • Page 22: Printed Wiring Boards -Cd Mechanism Section

    CDC-R237 4-6. PRINTED WIRING BOARDS — CD MECHANISM SECTION — • Refer to page 21 for Circuit Boards Location. THIS NOTE IS COMMON FOR PRINTED WIRING BOARDS AND SCHEMATIC DIAGRAMS. (In addition to this, the necessary note is printed in each block.) for schematic diagram: •...
  • Page 23 CDC-R237 • Semiconductor Location Ref. No. Location IC201 IC221 F-10 IC241 Q201 Q202 Q221 (Page 25)
  • Page 24: Schematic Diagram -Cd Mechanism Section

    CDC-R237 • Refer to page 21 for Waveforms. 4-7. SCHEMATIC DIAGRAM — CD MECHANISM SECTION — • Refer to page 30 for IC Block Diagrams. TPG3 TPG5 R281 C283 TP40 IC B/D C203 C281 R201 R282 C282 C284 TP41 TP8V...
  • Page 25: Printed Wiring Board -Main Section

    CDC-R237 4-8. PRINTED WIRING BOARD — MAIN SECTION — • Refer to page 21 for Circuit Boards Location. • Semiconductor Location Ref. No. Location Ref. No. Location D101 IC151 D151 IC401 D401 IC501 D402 IC901 D451 IC902 D501 D502 Q101...
  • Page 26: Schematic Diagram -Main Section (1/2)

    CDC-R237 • Refer to page 21 for Waveforms. 4-9. SCHEMATIC DIAGRAM — MAIN SECTION (1/2) — • Refer to page 30 for IC Block Diagrams. IC B/D TU101 R431 C431 R403 R405 IC151 R401 TP151 C411 C433 R433 C451 JR523...
  • Page 27: Schematic Diagram -Main Section (2/2)

    CDC-R237 4-10. SCHEMATIC DIAGRAM — MAIN SECTION (2/2) — • Refer to page 30 for IC Block Diagram. Note: • Voltage is dc with respect to ground under no-signal conditions. R439 Q401 no mark : FM ) : MW/LW JR107 JR106 <...
  • Page 28: Printed Wiring Boards -Front Section

    CDC-R237 4-11. PRINTED WIRING BOARDS — FRONT SECTION — • Refer to page 21 for Circuit Boards Location. D641 D642 (Page 25) JR643 • Semiconductor Location Ref. No. Location Ref. No. Location Ref. No. Location D601 D652 IC601 D602 D653...
  • Page 29: Schematic Diagram -Front Section

    CDC-R237 4-12. SCHEMATIC DIAGRAM — FRONT SECTION — J601 R609 CON601 R608 S602 S604 R607 S605 S606 R606 S601 R605 D601 D602 S611 S608 S612 S610 R610 (Page 27) S613 S614 S615 S616 S617 S618 R621 R622 C605 C923 C621...
  • Page 30: Ic Block Diagrams

    CDC-R237 4-13. IC BLOCK DIAGRAMS IC221 TA2153FN (SERVO Board) IC401 LC75421M-TLM-E (MAIN Board) RFN2 AGCIN GVSW RFGO RFRPIN RFCT RFRP LROUT RROUT LFOUT RFOUT PEAK BOTTOM INTERFACE LFIN 32 RFIN LOUT ROUT LBASS2 RBASS2 CONTROL LOGIC CONTROL CIRCUIT CIRCUIT CIRCUIT...
  • Page 31 CDC-R237 IC151 SAA6579T-T (MAIN Board) XOUT TEST MODE TEST LOGIC AND OUTPUT SELECTOR SWITCH OSCILLATOR 57kHz ANTI- QUALITY BIT RECONSTRUCTION BANDPASS ALIASING GENERATOR FILTER DIVIDER (8TH ORDER) FILTER BIPHASE COSTAS LCOP DIFFERENTIAL CLOKED SYMBOL VARIABLE AND DECODER COMPARATOR DECODER FIXED DIVIDER...
  • Page 32: Exploded Views

    CDC-R237 SECTION 5 EXPLODED VIEWS NOTE: • The mechanical parts with no reference • Color Indication of Appearance Parts The components identified by mark 0 or dotted line with mark number in the exploded views are not supplied. Example : 0 are critical for safety.
  • Page 33: Front Panel Section

    CDC-R237 5-2. FRONT PANEL SECTION not supplied (FRONT board) not supplied (AUX board) supplied not supplied supplied supplied not supplied not supplied supplied not supplied Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark X-3383-724-1 PANEL (SVX) ASSY...
  • Page 34: Cd Mechanism Section (1)

    CDC-R237 5-3. CD MECHANISM SECTION (1) (MG-930B-185) not supplied Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark X-3383-095-1 CHASSIS ASSY, HOLDER CNF 3-250-987-01 SCREW (CD HLDR), SPECIAL 1-687-801-11 FF-CABLE BOARD 3-251-005-01 SPRING (CLAMP), LEAF 1-687-802-11 PIC2 FLEXIBLE BOARD...
  • Page 35: Cd Mechanism Section (2)

    CDC-R237 5-4. CD MECHANISM SECTION (2) (MG-930B-185) supplied supplied The components identified by mark 0 or dotted line with mark 0 are critical for safety. Replace only with part number specified. Ref. No. Part No. Description Remark Ref. No. Part No.
  • Page 36: Electrical Parts List

    CDC-R237 SECTION 6 FRONT ELECTRICAL PARTS LIST NOTE: • Due to standardization, replacements in • Items marked “*” are not stocked since The components identified by mark 0 or dotted line with mark the parts list may be different from the they are seldom required for routine service.
  • Page 37 CDC-R237 FRONT MAIN Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark S606 1-762-365-21 SWITCH, TACTILE (DSPL) C404 1-162-965-11 CERAMIC CHIP 0.0015uF 10% S608 1-762-365-21 SWITCH, TACTILE (SEL) C405 1-164-505-11 CERAMIC CHIP 2.2uF S610 1-762-365-21 SWITCH, TACTILE (AF)
  • Page 38 CDC-R237 MAIN Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark C807 1-164-156-11 CERAMIC CHIP 0.1uF D808 6-500-522-01 DIODE 10EDB40-TA1B2 C808 1-164-227-11 CERAMIC CHIP 0.022uF D851 8-719-049-38 DIODE 1N5404TU C809 1-164-156-11 CERAMIC CHIP 0.1uF D902 8-719-991-33 DIODE 1SS133T-77...
  • Page 39 CDC-R237 MAIN Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark JR516 1-216-296-11 SHORT CHIP < RESISTOR > JR517 1-216-296-11 SHORT CHIP JR518 1-216-296-11 SHORT CHIP R101 1-216-857-11 METAL CHIP 1/10W JR520 1-216-296-11 SHORT CHIP R102 1-216-821-11 METAL CHIP...
  • Page 40 CDC-R237 MAIN SERVO Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark R504 1-216-835-11 METAL CHIP 1/10W R931 1-249-421-11 CARBON 2.2K 1/4W R505 1-216-835-11 METAL CHIP 1/10W R932 1-249-421-11 CARBON 2.2K 1/4W R506 1-216-835-11 METAL CHIP 1/10W...
  • Page 41 CDC-R237 SERVO Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark C247 1-165-176-11 CERAMIC CHIP 0.047uF R204 1-218-867-11 METAL CHIP 6.8K 1/10W C248 1-162-970-11 CERAMIC CHIP 0.01uF R205 1-216-864-11 METAL CHIP 1/10W C250 1-124-584-00 ELECT 100uF R206...
  • Page 42: Connections

    CDC-R237 Ref. No. Part No. Description Remark MISCELLANEOUS *************** 1-776-527-82 CORD (WITH CONNECTOR) (ISO) (POWER) 1-687-801-11 FF-CABLE BOARD 1-687-802-11 PIC2 FLEXIBLE BOARD A-3337-427-A CHASSIS ASSY (including M2) 0 160 X-3383-509-1 PICK-UP SUB ASSY (including OPTICAL PICK-UP) F901 1-532-982-11 FUSE (BLADE TYPE) (AUTO FUSE) 15A...

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