hit counter script
Kenwood RD-M23 Service Manual
  1. Manuals
  2. Brands
  3. Kenwood Manuals
  4. Stereo System
  5. RD-M23
  6. Service manual
Kenwood RD-M23 Service Manual

Kenwood RD-M23 Service Manual

Compact audio system
Hide thumbs Also See for RD-M23:

Advertisement

Table of Contents

COMPACT AUDIO SYSTEM
RD-M23
SERVICE MANUAL
(For M,X type)
Front cabinet
(A60-2147-08)
CD lid
(J19-6268-08)
Knob
(K29-8084-08)
Bottom cabinet
(A10-3564-08)
Digital out jack
(W02-2878-08)
In compliance with Federal Regulations, following are repro-
duction of labels on, or inside the product relating to laser prod-
uct safety.
Terminal
Headphone jack
(E70-0149-08)
(E11-0944-08)
KENWOOD-Corp. certifies this equipment conforms to DHHS
Regulations No.21 CFR 1040. 10, Chapter 1, subchapter J.
DANGER : Laser radiation when open and interlock defeated.
AVOID DIRECT EXPOSURE TO BEAM.
© 2001-9 PRINTED IN KOREA
B51-5756-00 (K/K) 547
Plate
(B03-3900-08)
Knob
(K29-8085-08)
Clear panel(DISK)
(B10-3764-08)
Socket
(E63-1228-08)
Rear panel
(A80-4203-08)
Socket
(E03-0384-08)
Terminal
(E21-0040-08)
70%

Advertisement

Table of Contents
loading

Related Manuals for Kenwood RD-M23

Summary of Contents for Kenwood RD-M23

  • Page 1 Headphone jack (E70-0149-08) (E11-0944-08) KENWOOD-Corp. certifies this equipment conforms to DHHS In compliance with Federal Regulations, following are repro- Regulations No.21 CFR 1040. 10, Chapter 1, subchapter J. duction of labels on, or inside the product relating to laser prod- uct safety.

  • Page 2: Table Of Contents

    SPECIFICATIONS ........Back cover WAVR FORM............15 Attention Please contact our KENWOOD Service Department in your side if you want the service information; Circuit Description. Full Described Parts list and so. Information is available to you by internet from us. Accessories AC power lead x1...
  • Page 3 STEP REMOVAL PROCEDURE FIGURE Caution on Disassembly Follow the below-mentioned notes when disassembling Rear panel/Terminal PWB 1. Screw ....(A1) x7 Power PWB Tuner PWB (D1) x1 the unit and reassembling it, to keep it safe and ensure 2. Socket ....(A2) x2 3.
  • Page 4 REMOVING AND REINSTALLING THE MAIN PARTS How to remove the CD lid (See Fig. 10-1.) Perform steps 1,2 and 8 of the disassembly method to remove the gear box.(See page 8,9) 1. Remove the switch PWB. 2. Remove the screws (A1) x 4 pcs., to remove the gear box lid.
  • Page 5 FROM FROM DISPLAY PWB DISPLAY PWB TUNER PWB 8 9 10 11 12 13 14 15 11 10 9 8 7 6 5 4 3 2 1 LED PWB CNP703 CNP702 CNP307 Q901 Q902 M_GND SWITCH PWB Q908 Q907 SW802 CD LID OPEN/CLOSE Q802...
  • Page 6 TUNER PWB SWITCHING Tracking fL Q351 FM MUTE T302 LEVEL X351 456kHz VD301 VR351 15 14 75ohms T306 AM Band SO301 Coverage fL ANTENNA TERMINAL IC301 BAND PASS TA7358AP FILTER FM FRONT END BF301 AM IF FM IF FM IF AM IF FM IF Q306...

  • Page 7: Trouble Shooting

    When the CD does not function Make sure that the disc is normal, and set the CD TEST MODE (STEP 1). When the CD section does not operate when the objective lens of the optical pickup is dirty, this section may not operate. Clean the objective lens, and check the playback operation.
  • Page 8 • Focus servo sawtooth wave failure. • Laser failure. Is +6.2V applied to the emiter of Q861 ? Check the PWB pattern between emiter of Q607 and emiter of IC802 is faulty. Is sawtooh wave output to the pin 48 (FOO) of IC802 ? Q861.
  • Page 9 • Track search failure • HF error. Does the sled motor run in FF/REW state when the SERVO Check as stated in item "SLED MOTOR OPERATION FAILURE". Is output (tracking error signal) obtained at the pins 46 (TEI) Optical pickup failure. Is output obtained at the pins 3 and TEST MODE "STEP1"...
  • Page 10 The test mode applied to this microcomputer has three modes, namely the ordinary test mode for adjustment or measurement, 2. Step 2 Mode the aging test mode, and the self-diagnosis test mode for self-judgment in case of final product inspection. Press the "CD PLAY"...
  • Page 11 5. Step 5 Mode When the CD initialization operation flow is completed, the mute is turned off, and playback is started. Even if playback 7. Step 7 Mode reaches the outermost periphery of disc, the operation does not stop. The LCD display indicates the playback passage time Press "MEMORY"...
  • Page 12 4. Electronic volume Test Mode (TEST 3) When this test mode is obtained, the following display lights for one second. 3. Tuner Test Mode (TEST 2) 1. Outline of tuner (radio) test mode The tuner test mode is intended to store the adjustment and measurement frequencies in the preset memory CH. When adjusting the tuner section in the production line, adjusting personnel are not required to set frequency.

  • Page 13: Test Mode

    ADJUSTMENT TEST MODE 7. Button input diagnosis Test Mode (TEST 6) TUNER SECTION When the test mode is obtained, the following is displayed. fL: Low-range frequency fH: High-range frequency • AM IF/RF • FM Mute Level Signal generator: 400 Hz, 30%, AM modulated Signal generator: 1 kHz, 40 kHz dev., FM modulated Frequency Frequency Display...

  • Page 14: Notes On Schematic Diagram

    RD-M23 NOTES ON SCHEMATIC DIAGRAM • Resistor: • The indicated voltage in each section is the one measured To differentiate the units of resistors, such symbol as K and by Digital Multimeter between such a section and the chas- M are used: the symbol K means 1000 ohm and the symbol sis with no signal given.

  • Page 15: Wave Form

    RD-M23 WAVE FORM NO DISC FOCUS SEARCH STOP PLAY TMAX IC802 30pin IC802 48pin SBOK IC804 26pin IC802 12pin IC804 25pin IC802 55pin FOCUS SEARCH TOC IL STOP PLAY IC802 57pin IC802 46pin IC802 43pin IC802 49pin IC802 46pin IC802 53pin...

  • Page 16: Parts Descriptions

    RD-M23 PARTS DESCRIPTIONS CAPACITORS • Capacitor value CC 45 TH 1H 220 J Color* CC45 010 = 1pF 0 = 22pF 100 = 10pF 1 = Type ... ceramic, electrolytic, etc. 4 = Voltage rating Multiplier 2 = Shape ... round, square, ect.

  • Page 17: Pc Board

    PC BOARD (Component side view) CNS804 TERMINAL PWB-A4 CNW804 C412 MAIN PWB-A1 R408 LEFT R406 M801 SO401 CD LID VIDEO/ OPEN/CLOSE AUX IN MOTOR RIGHT R407 L401 R405 C413 R436 CFW451 C416 SWITCH PWB-A5 C418 C411 CNS607 R438 R440 SO601 FROM SPEAKER CNP607...

  • Page 18: Schematic Diagram

    PC BOARD (Component side view) TO MAIN CNP703 TUNER PWB-A2 CNP307 TO MAIN PWB-A1 P17 6-E PWB-A1 R701 P24,25 6,7-G TP301 X352 2 3 4 5 6 7 8 1011 LED PWB-A7 R374 CNS307 CNS652 C397 R373 Q360 R379 SO301 D308 C391 C384...
  • Page 19 The value shown in ( ) is actual reading measured in the AM mode. MODULATION MODE CARRIER ANT INPUT FREQUENCY DEVIATION RD-M23 98MHz 1kHz STEREO 67.5kHz 7.5kHz(Pilot) 60dB 1000(999)kHz 400Hz MONO 30% MOD 60dB...
  • Page 20 1N4004 1N4004 R617 T681 POWER SW651 ZD601 TRANSFORMER VOLTAGE DZ130BSA (SUB) POWER PWB-B SELECTOR C621 SO655 CNP652 100/25 AC INPUT SOCKET AC 110/127/220/ RD-M23 230~240V, 50/60Hz AC 110/127/220/ FROM 230~240V, 50/60Hz AE-5 CNS652 AC POWER SUPPLY CORD DISPLAY PWB-A3 Y39-4120-21...
  • Page 21 C829 100/10 CNS805 CNW805 RD-M23 CAUTION: For continued safety, replace safety critical components only with manufacturer's recommended parts (refer to parts The DC voltage is an actual reading measured with a high list). indicates safety critical components. For continued protection against risk of fire, replace only with same type and rating impedance type voltmeter with no signal input.
  • Page 22 The DC voltage is an actual reading measured with a high impedance CAUTION: For continued safety, replace safety critical components only with manufacturer's recommended parts (refer to RD-M23 type voltmeter with no signal input. The measurement value may vary parts list).

  • Page 23: Exploded View

    RD-M23 EXPLODED VIEW (MECHANISM) A : 1.5x3.8x0.25 : N19-1527-08 B : ø 2x3 : N09-5339-08 NSW801 C : ø 2.6x6 : N09-5340-08 D : 2x5 : N09-5341-08 PWB-C Parts with exploded numbers larger than 700 are not supplied.
  • Page 24 RD-M23 EXPLODED VIEW (UNIT) M801 φ 2.5x10 N09-5360-08 Washer N19-1528-08 φ PWB-A6 2.5x8 N09-5361-08 φ 2.5x10 N09-5362-08 PWB-A5 φ 2.5x12 N09-5363-08 φ 2.5x8 N09-5364-08 φ N09-5365-08 : N09-5345-08 N09-5348-08 φ N09-5366-08 φ N09-3567-08 φ PWB-A3 3x10 N09-5331-08 φ 3x14 N09-5347-08 φ...
  • Page 25 Ref. No Description Parts No. Parts No. Description Ref. No Parts nation marks ress ress Parts nation marks ✽ N09-5363-08 SCREW,2.5X12mm,XEBSD25P12000 RD-M23 ✽ N09-5364-08 SCREW,2.5X8mm,6XEBSF25P08000 ✽ N09-5365-08 SCREW,2X5mm,607XHBSD20P05000 ✽ A60-2147-08 FRONT CABINET GCABA1071SJSA ✽ N09-5345-08 SCREW,3X6mm,608XHBSD30P06000 ✽ A10-3564-08 BOTTOM CABINET GCABB1066SJSA...
  • Page 26 ✽ New Parts ✽ New Parts Parts without Parts No. are not supplied. Parts without Parts No. are not supplied. Les articles non mentionnes dans le Parts No. ne sont pas fournis. Les articles non mentionnes dans le Parts No. ne sont pas fournis. Teile ohne Parts No.
  • Page 27 ✽ New Parts ✽ New Parts Parts without Parts No. are not supplied. Parts without Parts No. are not supplied. Les articles non mentionnes dans le Parts No. ne sont pas fournis. Les articles non mentionnes dans le Parts No. ne sont pas fournis. Teile ohne Parts No.
  • Page 28 ✽ New Parts ✽ New Parts Parts without Parts No. are not supplied. Parts without Parts No. are not supplied. Les articles non mentionnes dans le Parts No. ne sont pas fournis. Les articles non mentionnes dans le Parts No. ne sont pas fournis. Teile ohne Parts No.
  • Page 29 ✽ New Parts ✽ New Parts Parts without Parts No. are not supplied. Parts without Parts No. are not supplied. Les articles non mentionnes dans le Parts No. ne sont pas fournis. Les articles non mentionnes dans le Parts No. ne sont pas fournis. Teile ohne Parts No.

  • Page 30: Specifications

    CD digital output (optical) Input terminals Video/Auxiliary (audio signal): 500 mV/47 kohms KENWOOD follows a policy of continuous advancements in development. For this reason specifications may be changed without notice. Notes • Sufficient performance may not be exhibited at extremely cold locations (Where water freezes).

Table of Contents