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Kenwood KDC-237SA Service Manual
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Kenwood KDC-237SA Service Manual

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CD RECEIVER
KDC-237SA/237SAY
KDC-237SG/237SGY
SERVICE MANUAL
Panel assy
KDC-237SA/237SAY/237SG/237SGY (A64-4059-02)
B.BOOST
MENU
VOL
AUD
SET UP
TI
AME
ATT
Lever
(D10-4589-04) x2
Antenna adaptor
(T90-0523-05)
SPARE TDF PANEL
MAIN UNIT NAME
KDC-237SA/237SAY
KDC-237SG/237SGY
SCAN
RDM
REP
DC cord
(E30-6427-05)
Escutcheon
(B07-3122-01)
© 2006-12 PRINTED IN JAPAN
B53-0481-00 ( N ) 345
TDF PARTS No.
Y33-2660-62
Y33-2660-63
KDC-237
FM
SCRL
AM
Carrying case
(W01-1685-05)
Mounting hardware assy
(J21-9716-03)
This product uses Lead Free solder.
TDF NAME
TDF-237A
TDF-237G
/ PTY
DISP

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Summary of Contents for Kenwood KDC-237SA

  • Page 1 B53-0481-00 ( N ) 345 SPARE TDF PANEL MAIN UNIT NAME TDF PARTS No. TDF NAME KDC-237SA/237SAY Y33-2660-62 TDF-237A KDC-237SG/237SGY Y33-2660-63 TDF-237G Panel assy KDC-237SA/237SAY/237SG/237SGY (A64-4059-02) B.BOOST MENU / PTY DISP KDC-237 SCRL SET UP SCAN Lever DC cord Carrying case...

  • Page 2: Block Diagram

    KDC-237SA/237SAY KDC-237SG/237SGY BLOCK DIAGRAM ELECTRIC UNIT (X34- ) Q901-903 ANT. DME1 DC-DET AM+B LX-BUS R103 TUNER FRONT-END MECHA PHONE PHONE SERVO+B POWER Q101 ACC DET ACC-DET Q401 ANALOG Q103 CONT BU-DET BU DET IC2 or IC3 Q102 DC-CN Q701-704 CN4,J5...

  • Page 3: Components Description

    KDC-237SA/237SAY KDC-237SG/237SGY COMPONENTS DESCRIPTION ELECTRIC UNIT (X34-4672-78) Ref. No. Application / Function Operation / Condition / Compatibility System µ-COM Controls FM/AM tuner, the changer, CD mechanism, panel, volume and tone. E-VOL Controls the source, volume and tone. Power Supply IC Outputs 5Vx2, 8.1Vx2, 10.2V, P-CON and P-ANT.

  • Page 4: Microcomputer's Terminal Description

    KDC-237SA/237SAY KDC-237SG/237SGY COMPONENTS DESCRIPTION Ref. No. Application / Function Operation / Condition / Compatibility Q1 SW Q2 is ON when Q6 is ON. 5V-3.3V Level Shift Shifts 5V to 3.3V, or 3.3V to 5V. 5V-3.3V Level Shift Shifts 3.3V to 5V.
  • Page 5 KDC-237SA/237SAY KDC-237SG/237SGY MICROCOMPUTER’S TERMINAL DESCRIPTION Truth Value Pin No. Pin Name Application Processing Operation Description Table PON FL Key illumination power supply control ON: H, OFF: L Not used ON: L, Momentary power down/Panel detached PON PANEL Panel 5V control...
  • Page 6 KDC-237SA/237SAY KDC-237SG/237SGY MICROCOMPUTER’S TERMINAL DESCRIPTION Truth Value Pin No. Pin Name Application Processing Operation Description Table Not used Output L fixed RDS AFS M Noise detection time constant switching Refer to the truth value table TUN IFC OUT Front-end IFC-OUT input...
  • Page 7 KDC-237SA/237SAY KDC-237SG/237SGY MICROCOMPUTER’S TERMINAL DESCRIPTION Truth Value Pin No. Pin Name Application Processing Operation Description Table AVSS REF CON VREF control Connects to VREF VREF AVCC LX DATA S Data from slave unit Pull-down (GND) • Truth value table q CD motor control...

  • Page 8: Test Mode

    KDC-237SA/237SAY KDC-237SG/237SGY TEST MODE Example Description of display Description Disc EJECT times display Disc EJECT times display. MAX 65535 (times) While disc EJECT times is displayed, press and hold for 2 seconds or longer to clear disc EJECT times. A symbol “ ” in the key column indicates that the key should be pressed and held for 1 second or longer.
  • Page 9 KDC-237SA/237SAY KDC-237SG/237SGY TEST MODE Special displays when all lights are on in STANDBY source Description of display Description Common All lights ON. All lights ON. “TYPE” indicates system µ-com (IC1) destination, and shows Destination terminal E : 1 condition indication real-time condition of the destination terminal.
  • Page 10 KDC-237SA/237SAY KDC-237SG/237SGY TEST MODE • CD information display mode Description of display Description I2C com- I2C communication OK (forward munication rotation) status I2C communication NG (reverse CD mecha- Mechanism error log 1 (Latest) 1 : X rotation) nism error XX: Error number. “– –” is displayed in case there is no error.
  • Page 11 KDC-237SA/237SAY KDC-237SG/237SGY TEST MODE Test mode specifications in TUNER source Error is found in front-end (A1), etc. if indications below is displayed while in tuner source. Status Display Description Front-end (A1) E2PROM data error Front-end (A1) E2PROM is still the default (unspecified) value.
  • Page 12 KDC-237SA/237SAY KDC-237SG/237SGY TEST MODE Test mode specifications in CD source Display mode default: P-Time • Procedure in CD-DA media (KTD-02A) Description of display Description Track up procedure Every time pressed, jumps to the track shown below. No.9 → No.15 → No.10 → No.11 → No.12 → No.13 →...
  • Page 13 KDC-237SA/237SAY KDC-237SG/237SGY TEST MODE MENU-related test mode Procedure Note Press the [B.BOOST] key (main unit) Continuous forwarding by remote control is prohibited Press the [DNPP/SBF] and [DIRECT] keys (Remote control) Backup current measurement Procedure Note While ACC OFF (Back Up ON), Reset MUTE terminal is OFF after 2 seconds, not after 15 seconds.
  • Page 14 KDC-237SA/237SAY KDC-237SG/237SGY TEST MODE Procedure Display Description Press and hold the [3] and When DC offset error is detected (when either one of capacitors is [6] keys, and reset-start leaking, or an improper connection or another error is detected) When DC offset error is not detected (when none of capacitors leak, no improper connection or other error is detected) When improper connection or other DC offset errors are detected.

  • Page 15: Rom Data Transfer Processes

    KDC-237SA/237SAY KDC-237SG/237SGY ROM DATA TRANSFER PROCESSES When replacing front-end (A1) of mother unit (X34-), or when Operation procedure adding or replacing ROM correction (program correction with Operation procedure is different depending on the conditions. ROM IC (IC10)), the following activities are required.
  • Page 16 KDC-237SA/237SAY KDC-237SG/237SGY ROM DATA TRANSFER PROCESSES Turn power on. Install new front-end (A1). Press and hold the [1] and [3] keys and press reset button. No ROM correction or other data status. (Enter the system in the test mode.) Press [B.BOOST] key. (ROM data System enters data trans- fer mode.)
  • Page 17 KDC-237SA/237SAY KDC-237SG/237SGY ROM DATA TRANSFER PROCESSES 4. In case of applying a new ROM correction when front-end Turn power on. (A1) is replaced (There is ROM correction data.) Press and hold the [1] and [3] keys, press reset button. (Enter 5.
  • Page 18 KDC-237SA/237SAY KDC-237SG/237SGY ROM DATA TRANSFER PROCESSES Press [ ] key. (Exit ROM data transfer mode.) Turn power on. Turn power off. Press and hold the [1] and [3] keys press reset button. (Enter the system in the test mode.) Remove front-end (A1).
  • Page 19 KDC-237SA/237SAY KDC-237SG/237SGY PC BOARD (COMPONENT SIDE VIEW) (FOIL SIDE VIEW) SWITCH UNIT SWITCH UNIT X16-386x-xx (J76-0360-02) X16-386x-xx (J76-0360-02) TDF DET FL+B AUX L AUX G AUX R GUARD VFD DATAS VFD CLK VFD DATAF VFD RST REMO PAN5V FL SW11 25V...
  • Page 20 KDC-237SA/237SAY KDC-237SG/237SGY PC BOARD (FOIL SIDE VIEW) ELECTRIC UNIT X34-4672-78 (J76-0358-02) W100 W807 W806 W805 R101 W102 W803 R102 W902 R910 R908 D103 R106 Q901 R905 R903 R801 R110 R107 R901 Q102 D105 D106 W812 C102 D901 D803 DC-DET R108...
  • Page 21 KDC-237SA/237SAY KDC-237SG/237SGY X34-4672-78 Ref. No. Address C703 2 3 4 8 12 11 13 R604 C604 Q701 Q702 C603 R959 R710 R712 R803 C706 Q704 Q101 R807 Q703 Q102 Q103 C705 W701 Q104 R492 Q105 Q301 R791 Q302 Q401 R793...
  • Page 22 KDC-237SA/237SAY KDC-237SG/237SGY PC BOARD (COMPONENT SIDE VIEW) CD PLAYER UNIT X32-5980-00 (J76-0377-02) R28 R27 X32-5980-00 Ref. No. Address Refer to the schematic diagram for the values of resistors and capacitors.
  • Page 23 KDC-237SA/237SAY KDC-237SG/237SGY PC BOARD (FOIL SIDE VIEW) CD PLAYER UNIT X32-5980-00 (J76-0377-02) P-ON2 P-ON1 IOP+ R105 R101 R100 FCS+ R103 FCS- A3.3V NPWDOWN R129 R128 C15 R13 TP24 CP11 R132 OCDSEL R102 TESTIN0 /MRST /MUTE FCLK /MSTOP LO/EJ MOTOR BU5V...
  • Page 24 KDC-237SA/237SAY KDC-237SG/237SGY ELECTRIC UNIT (X34-46xx-xx) ∗ R606 1K REQ S TP98 R609 100 MUTE TP95 R607 1K DATA S TP97 2SB1565 R605 100 TP99 R608 100 DATA M TP96 R610 4.7K TP94 LX BUS TP102 R601 C601 GND2 0.47 CH-L...
  • Page 25 KDC-237SA/237SAY KDC-237SG/237SGY TP315 C808 1u50 R807 4.3K ∗ POWER DC OFFSET TP903 TP316 Q903 R904 TP902 Q902 GND2 CH-L Q901 CH-R R598 W803 R892 R599 Q901 Q902,903 CH-G DC OFFSET DC OFFSET DET SW AUDIO+B-1 ∗ D801 ROM CORRECTION (NOT USED)
  • Page 26 KDC-237SA/237SAY KDC-237SG/237SGY BU5V-1 BU5V-1 BU5V-2 ∗ R229 TP432 100K 5.0V 5.0V P ANT D104 TP502 5.0V RESET IC ∗ ∗ R201 BU DET LX DATA M P CON D102 0 or 1.6 or 2.5 or LX CLK ∗ ACC DET 3.4 or 5.0V...
  • Page 27 KDC-237SA/237SAY KDC-237SG/237SGY DC CN F1 10A TP16 (F52-0023-05) FUSE CAUTION : For continued safety, replace safety critical components only with manufacturer’s recom- mended parts (refer to parts list). Indicates safety critical components. To reduce the risk of electric shock, leakage-current or resis-...
  • Page 28 KDC-237SA/237SAY KDC-237SG/237SGY ANODE CONNECTION 3GA,3GB 1GA,1GB NAME (3GB/1GB/3GA/2G) (1GA) col (Downside) SWITCH UNIT (X16-386x-xx) R80 47 1/2W R81 47 1/2W R82 47 1/2W Upside Downside col (Upside) ∗ REMOTE CONTROL SENSOR TP56 KEY MATRIX ∗ 100K AUTO BASS BOOST TP57...
  • Page 29 EJECT TP51 TP52 TP53 TP54 TP55 ∗ VOL ILL ∗ TP170 TP174 SUB ILL TP172 ∗ ∗ ∗ ∗ ∗ 2.2K 2.2K GREEN LED SW LED SW AUX IN KDC-237SA/237SAY/237SG/237SGY (2/2) X16-386x-xx (2/2)
  • Page 30 KDC-237SA/237SAY KDC-237SG/237SGY CD PLAYER UNIT (X32-598x-xx) A3.3V 3.3V A8V SW ∗ ∗ ∗ D.GND A3.3V A.GND 1.5V ∗ 16.934MHz Q1 SW ASEL OCDSEL ∗ 5V-3.3V 4.00pp LEVEL BCLK SHIFT 3.3V LRCK ∗ 3.3V 0-3.3V SRDATA 0-3.2V 3.3V R106 MUTE R MUTE L N.C.
  • Page 31 KDC-237SA/237SAY KDC-237SG/237SGY A3.3V A.GND CAUTION : For continued safety, re- ∗ place safety critical components only ∗ C71 10 with manufacturer’s recommended ∗ ∗ C72 0.1 parts (refer to parts list). ∗ Indicates safety critical components. C73 10 16.934MHz ∗...
  • Page 32 KDC-237SA/237SAY KDC-237SG/237SGY EXPLODED VIEW (CD MECHANISM) DPU1 DFPC1 (X32) φ : N09-4460-15 M1.6x6.0 : N09-6317-05 M1.7x2.5 : N09-6004-15 M2x2 : N09-6007-15 φ 2x5(BLK) : N09-6051-15 1.6 WASHER : N19-2163-04 M2x2 : N39-2020-48 φ 2x3.5 : N09-6108-15 φ : N09-6155-15 Parts with the exploded numbers larger than 700 are not supplied.

  • Page 33: Exploded View (Unit)

    KDC-237SA/237SAY KDC-237SG/237SGY EXPLODED VIEW (UNIT) DME1 : N24-3015-48 : N80-2006-48 : N80-2008-43 : N83-3005-48 : N86-2610-48 : N80-3010-48 : N83-3005-48 : N83-3020-48 : N86-2606-48 (X34) (X34) (X16-) (X34-) Parts with the exploded numbers larger than 700 are not supplied.

  • Page 34: Parts List

    1000PF B30-1566-05 LED (1608,RED) C36,37 CK73GB1H682K CHIP C 6800PF E1 : KDC-237SA E2 : KDC-237SG E3 : KDC-237SAY E4 : KDC-237SGY Indicates safety critical components. (E : Europe K : North America M : Other Areas W : Without Europe)
  • Page 35 RK73GB2A910J CHIP R J 1/10W C306,307 CK73FB1E474K CHIP C 0.47UF E1 : KDC-237SA E2 : KDC-237SG E3 : KDC-237SAY E4 : KDC-237SGY Indicates safety critical components. (E : Europe K : North America M : Other Areas W : Without Europe)
  • Page 36 100K J 1/10W R807 RK73GB2A432J CHIP R 4.3K J 1/10W E1 : KDC-237SA E2 : KDC-237SG E3 : KDC-237SAY E4 : KDC-237SGY Indicates safety critical components. (E : Europe K : North America M : Other Areas W : Without Europe)
  • Page 37 2SC4081 TRANSISTOR N09-6051-15 TAPTITE SCREW (PT2X5) Q902,903 2SA1576A TRANSISTOR E1 : KDC-237SA E2 : KDC-237SG E3 : KDC-237SAY E4 : KDC-237SGY Indicates safety critical components. (E : Europe K : North America M : Other Areas W : Without Europe)

  • Page 38: Specifications

    Digital filter (D/A) ......8 Times Over Sampling D/A Converter ..............1Bit Spindle speed ......... 500~200rpm (CLV) KENWOOD follows a policy of continuous advancements in development. For this reason specifications may be Wow & Flutter ........Below Measurable Limit changed without notice.

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