Kenwood DM-VH7 Service Manual
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Kenwood DM-VH7 Service Manual

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MINI DISC RECORDER
DM-VH7
QQ
3 7 63 1515 0
SERVICE MANUAL
Knob
(K29-7554-04)
TE
L 13942296513
646
Insulator assy
(J02-1444-14)
AC power cord *
(E30-)
632
610
www
Side plate R
(A50-1326-02)
.
Do not face the light of laser when a repair or action confirmation are done.
Refer to X-VH7 service manual (B51-5532-00), if need Disassembly for repair.
Panel
(A29-1051-14)
609
minidisc recorder DM-VH7
disc loading mechanism
eject
recording
standby
20bit A/D
D/A converter
&
619
Indicator
(B12-0361-04)
AC power cord bushing
(J42-0083-05)
654
x
ao
y
i
8
Dressing panel
Dressing panel (TOP)
(A21-3762-13)
(A21-3757-12)
608
606
mode
rec level
enter
Q Q
3
6 7
1 3
607
Dressing panel (BOTTOM)
(A21-3758-02)
Metallic cabinet (TOP)
(A01-3696-01)
601
SYSTEM
REC
CONTROL
IN
L
R
J3
Rectangular receptacle
Phono jack
(E08-0312-05)
(E63-1065-05)
u163
.
* Refer to parts list on page 27.
2 9
9 4
2 8
© 1999-6/B51-5544-00 (K/K) 3632
Knob *
(K29-)
1 5
0 5
8
2 9
9 4
617
Front glass
(B10-3486-03)
Optic receiving module
(W02-1181-05)
A1-A2
PLAY
OUT
1
2
DIGITAL IN
OPTICAL
J1
602
m
Metallic cabinet
(BOTTOM)
co
(A01-3698-01)
9 9
660
2 8
9 9
611
Side plate L
(A50-1327-02)
70%
loading

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Summary of Contents for Kenwood DM-VH7

  • Page 1 SERVICE MANUAL © 1999-6/B51-5544-00 (K/K) 3632 Knob Panel Dressing panel Dressing panel (TOP) Knob * (K29-7554-04) (A29-1051-14) (A21-3762-13) (A21-3757-12) (K29-) minidisc recorder DM-VH7 disc loading mechanism eject mode recording rec level enter standby 20bit A/D D/A converter & L 13942296513...

  • Page 2: Table Of Contents

    Use of controls or adjustments or performance of proce- 2967-3, ISHIKAWA-CHO, u163 HACHIOJI-SHI, TOKYO, JAPAN dures other than those specified herein may result in KENWOOD CORP. CERTIFIES THIS hazardous radiation exposure. EQUIPMENT CONFORMS TO DHHS REGULATIONS NO. 21 CFR 1040.10, In compliance with Federal Regulations, following are re- CHAPTER 1, SUBCHAPTER J.

  • Page 3: Circuit Description

    DM-VH7 3 7 63 1515 0 CIRCUIT DESCRIPTION 1. Backup and initialization (MD ucom) No backup item Initialization Backup item Initialization PLAY mode TRACK MODE • MONITOR REPEAT • REC INPUT ANALOG • REC INPUT/ LEVEL ANALOG=-12dB (MECHA ucom) • REC mode...
  • Page 4 DM-VH7 3 7 63 1515 0 CIRCUIT DESCRIPTION 2-2 Pin description Pin No. Name Description VOL_DT Electric VOL IC • communication data VOL_CK Electric VOL IC • communication clock Not used DISP_CE Display ucom • communication CE DISP_OUT Display ucom • communication data output DISP_IN Display ucom •...
  • Page 5 DM-VH7 3 7 63 1515 0 CIRCUIT DESCRIPTION 2-3 Key matrix Threshold Voltage(V) KR0 (89) KR1 (90) KR2 (91) voltage(V) 5.00 (no key on) (no key on) (no key on) 4.59 4.17 ----- eject ----- 3.75 3.33 power/standby o.t.e. ----- 2.92...
  • Page 6 DM-VH7 3 7 63 1515 0 CIRCUIT DESCRIPTION 3-2 Pin description Pin No. Name Description E2PROM clock E2PROM data 3~11 Not used VDD/power supply Not used 15~30 Not used SRVMOD X-Y position output 32~34 Not used MUTE_BAR Mute L:MUTE ON...
  • Page 7 DM-VH7 CIRCUIT DESCRIPTION 3 7 63 1515 0 Pin No. Name Description MNT1 ACRIC/ATRAC en/decoder IC shock (track jump) detection XINT ATRAC thrust 93~95 Not used ACRIC/ATRAC en/decoder IC TX (Recording data output enable) RECP ACRIC/ATRAC en/decoder IC RECP (Laser power changeover)
  • Page 8 DM-VH7 CIRCUIT DESCRIPTION 3 7 63 1515 0 5. TEST MODE For more information on each adjustment mode, refer to each section of 6, "Electrical adjustment". 5-1 How to Setting and Cancel Test Mode If other adjustment mode has been entered incorrectly, Setting: While pressing the ON/STANDBY and MODE press the STOP key to exit the mode.
  • Page 9 DM-VH7 CIRCUIT DESCRIPTION 3 7 63 1515 0 6. Electrical adjustment 6-5 Offset Adjustmen 6-1 Precaution during confirmation of Laser Diode N o . K e y D i s p l a y / F u n c t i o n...
  • Page 10 DM-VH7 CIRCUIT DESCRIPTION 3 7 63 1515 0 6-7 Traverse Adjustment 6-8 Focus Bias Adjustment Connection : Use the special disc(continuous recorded disc) Oscilloscope N o . K e y D i s p l a y / F u n c t i o n...

  • Page 11: Mechanism Description

    DM-VH7 3 7 63 1515 0 MECHANISM DESCRIPTION 1. Eject Operation 1. The gear(worm) turns clockwise(1) if the start limit switch is in off. (the pickup Gear(Feed) is not full inward position) 2. The gear(feed) turns frontwards.(2) 3. The pickup travels inwards by the reed-screw.(3) Gear(Worm) 4.
  • Page 12 DM-VH7 3 7 63 1515 0 MECHANISM DESCRIPTION FRONT Slider (outer) Lever (change) Slider (inner) 12. The lever(change) moves and turns clockwise(0) after the slider(outer) travels to the stop position. 13. The gear(final) separates from the slider(outer). And the gear(final) engages with the slider(inner).
  • Page 13 DM-VH7 3 7 63 1515 0 MECHANISM DESCRIPTION HOLDER ASS'Y FRONT 2. Loading Operation 1. The disc is loaded. 2. The slider(inner) is pressed. 3. The eject detection switch turns off. 4. The loading motor turns counterclockwise. L 13942296513 5. The disc is inserted into the mechanism in the reverse order of eject operation.

  • Page 14: Pc Board

    PC BOARD(Component side view) 3 7 6 3 1 5 1 5 0 X33-1190-00 (J70-1311-02) C161 C141 C153 C160 X25-6240-00 A/3 (J70-1312-12) R119 X25 B/3 C114 R124 R118 R116 C120 R161 R122 C125 C163 R120 C127 C126 R126 R163 R128 R130 R129 C105...
  • Page 15 1.6V 3.2V ADIP DECODER BOTM 1 3 9 4 2 2 9 6 5 1 3 1.8V 1.6V 1.4V 3.1V APCD 1.7V R146 R150 DM-VH7 1.9V 1.2V SL/SP MOTOR DRIVE 1.4V FOC./TRA.DRIVE OPTICAL 1.7V 3.1V 1.6V 1.9V PICKUP 3.2V 3.0V...
  • Page 16 L88M33T +3.3V +3.3V DIGITAL -5V(GND) AINL(BCK) w w w DGND AINR(DATA) MECHARST u 1 6 3 BACKON R10 100 CRXD BD7911FV R11 100 +3.3V +3.3V CTXD R13 100 BACKUPV DM-VH7 +3.3V +3.3V +3.3V +3.3V(OUTPUT) HGND 26 H+5V DM-VH7(J/K) (1/2) Y22-8050-11...
  • Page 17 (X25-6240-XX) (A/3) R133 100K 3 7 6 3 1 5 1 5 0 R131 SDATA 3.2V BACKUP R132 ON/OFF u+5V u+5V u+5V SBUSY R134 SGND 100K 10MHz C108 R122 0.01 R139 SYSTEM u+5V 100K CONTROL C103 C106 5.0V 220P 2.4V 4.7V 5.0V R140...
  • Page 18 (REC) refers to the value during MD RECORDING. : AC100V 50/60Hz 1000u25 : AC120V 60Hz -0.6V : AC230V~ 50Hz (T,E) -9.6V -10.2V w w w 6800P 9.5V 13.7V 13.7V u 1 6 3 DM-VH7(J,K) (2/2) -9.5V -12.8V -9.5V AVR 29 30 DM-VH7 Y22-8050-11...
  • Page 19 DM-VH7 3 7 63 1515 0 EXPLODED VIEW (MD MECHANISM) X29 (B/2) L 13942296513 X29 (A/2) M2x3.5 N86-2004-46 ø2.6x10 N09-2817-05 ø2x6 N09-4154-05 M1.7x2 N09-3104-05 u163 M2x4 N09-3500-05 M1.7x3 N09-3279-05 X33-1190-00 M1.7x4.5 N39-1745-46 MDM-06 Parts with exploded numbers larger than 700 are not supplied.
  • Page 20 L 1 3 9 4 2 2 9 6 5 1 3 X25 (B/3) ø2x8 : N82-2608-46 M3x8 : N86-3008-46 ø3x8 (BLK) : N89-3008-45 ø3x8 : N89-3008-46 ø3x8(BLK) : N95-3006-45 ø3x6(BLK) : N09-1445-05 ø4x8 : N09-1729-05 EJECT MODE PLAY/PAUSE O.T.E. ON/STANDBY DOWN u 1 6 3 STOP DM-VH7...
  • Page 21 Desti- Desti- Ref. No Parts No. Description Ref. No Parts No. Description ress Parts nation marks Parts nation marks ress DM-VH7 J19-5994-04 HOLDER J19-5995-14 HOLDER A01-3696-01 METALLIC CABINET(TOP) J19-5996-02 BRACKET A01-3698-01 METALLIC CABINET(BOTTOM) J42-0083-05 POWER CORD BUSHING A09-1106-08 CABINET J61-0098-05...
  • Page 22 3 7 6 3 1 5 1 5 0 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 23 3 7 6 3 1 5 1 5 0 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 24 3 7 6 3 1 5 1 5 0 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 25 3 7 6 3 1 5 1 5 0 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 26: Parts List

    H : 237 mm (9 - 5 / 16") D : 279 mm (11") Weight (Net) ................3.1 kg (6.8 lb) 1. KENWOOD follows a policy of continuous advancements in development. For this reason specifications may be changed without notice. Notes Notes 2.