Kenwood DMVH-7 Service manual
MINI DISC RECORDER
70%
646
609 608 606
617607619
660
rec level
recording
eject
standby
enter
stop
rec
o.t.e.
on/standby
mode
disc loading mechanism
minidisc recorder DM-VH7
20bit A/D&D/A converter
654 601 A1-A2
611
602J1J3
632
610
DIGITAL IN
OPTICAL
SYSTEM
CONTROL
L
R
RECINPLAY
OUT
12
DM-VH7
SERVICE MANUAL
© 1999-6/B51-5544-00 (K/K) 3632
Knob
(K29-7554-04)
Insulator assy
(J02-1444-14)
Panel
(A29-1051-14)
AC power cord *
(E30-)
Dressing panel
(A21-3762-13)
Indicator
(B12-0361-04)
AC power cord bushing
(J42-0083-05)
Dressing panel (TOP)
(A21-3757-12)
Dressing panel (BOTTOM)
(A21-3758-02)
Metallic cabinet (TOP)
(A01-3696-01)
Knob *
(K29-)
Front glass
(B10-3486-03)
Optic receiving module
(W02-1181-05)
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.
Rectangular receptacle
(E08-0312-05)
Phono jack
(E63-1065-05)
* Refer to parts list on page 27.
Metallic cabinet
(BOTTOM)
(A01-3698-01)
Side plate L
(A50-1327-02)
2ABC1 3DEF
5JKL 6MNO4GHI
8TUV 9WXY7PRS
EDIT
CANCEL
0QZ
,
,:? +10
&
(
)
-/
+100
RANDOM
REPEAT
CHECK
/SPACE
P.MODE
/CHARAC.
CLEAR
DELETE
EDIT
SET ENTER
87
¡
14¢
REC MODE
TIME DISP.
TITLE
SEARCH
MONITOR
REMOTE CONTROL UNIT
RC-M0708
O.T.E.
÷
PLAY
£
TITLE
INPUT
REC INPUT
POWER
Audio cord (2)
(E30-0615-05)
(A70-1279-05)
(J02-0130-05)
(J19-5996-02)
Battery cover (A09-1106-08)
(E30-2628-05) (B19-1529-05)
(W01-0084-05)
System control cord (1) Optical fiber cable (1)
Remote control unit (1)
Batteries (R6/AA) (2)
Check that the following accessories are present.
Spacer (1)
Replacement front feet (2)
Allen wrench (1)
DM-VH7
Operation to reset
The microprocessor may fall into malfunction (impossibility
to operate erroneous display, etc.) when the power cord is
unplugged while power is ON or due to an external factor.
In this case, execute the following procedure to reset the
microprocessor and return it to normal condition.
Unplug the power cord from the power outlet then, while
holding the eject (0 eject) key depressed, plug the power
cord again.
¶ Please note that resetting the microprocessor clears
the contents stored in, it returns the microprocessor to
the condition when it left the factory.
Note related to transportation and
movement
Before transporting or moving this unit, carry
out the following operations.
1.With no disc loaded in the unit, press the “on/
standby” key to on.
¶ Check that no disc is present in the unit.
2.Wait a few seconds and verify that the display
shown appears.
3. Press the “on/standby” key to off (standby).
CAUTION :
Use of controls or adjustments or performance of procedures other than those specified herein may result in
hazardous radiation exposure.
In compliance with Federal Regulations, following are reproductions of lables on, or inside the product relating to
laser product safety.
For the U.S.A.
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KENWOOD CORPORATION
2967-3, ISHIKAWA-CHO,
HACHIOJI-SHI, TOKYO, JAPAN
KENWOOD CORP. CERTIFIES THIS
EQUIPMENT CONFORMS TO DHHS
REGULATIONS NO. 21 CFR 1040.10,
CHAPTER 1, SUBCHAPTER J.
- - - - - - - - - - -
Location: Back Panel
CONTENTS / ACCESSORIES / CAUTIONS
Contents
CONTENTS / ACCESSORIES / CAUTIONS............. 2
CIRCUIT DESCRIPTION............................................3
MECHANISM DESCRIPTION...................................11
PC BOARD .............................................................. 14
Accessories
SCHEMATIC DIAGRAM.......................................... 16
EXPLODED VIEW ....................................................25
PARTS LIST..............................................................27
SPECIFICATIONS ......................................Back cover
System configuration
CD RECEIVER CASSETTE DECK SPEAKERS
VH-600 RD-VH7 – LS-VH7
VH-700 RD-VH7 X-VH7 LS-VH7
Cautions
2
Backup item Initialization
• MONITOR OFF
• REC INPUT ANALOG
• REC INPUT/ LEVEL ANALOG=-12dB
• REC mode
TNO MARK AUTO
TNO MARK LEVEL 0(-55dB)
(MD ucom)
1. Backup and initialization
No backup item Initialization
PLAY mode TRACK MODE
REPEAT OFF
(MECHA ucom)
Backup item Initialization
DISC editing record UTOC information
DIN AIN AOUT
UART
A/D INT PWM
PWM
SIO
Mechanism unit
(X33)IC24
MECHA uCOM
HD6432227N01FA
Main uCOM
M30620MC-340FP
(X25)IC12
DISPLAY
LCD driver
(64 x 64 full_dot)
LCD module
HD6433297A17F
uCOM
standby eject rec
REM
Key matrix
(2 x 6)
Back up
circuit
Din1 Din2 REC PLAY SL16
vol
MUTE
(X25)IC11
DM-VH7
CIRCUIT DESCRIPTION
• The case of the system connection don't memorise
REC INPUT,REC LEVEL and stand up the same
initialization. System ON/OFF and POWER
ON/OFF are memorised the last selector position.
2. MD microprocessor M30620MC-340FP(X25: IC11)
2-1 Micoprocessor periphery block diagram
• The case of DISC exist editing record : the set dont
read TOC at AC power on
_ Setting of the initialization
While pressing the EJECT key, plug an AC power cord
into AC outlet.
3
DM-VH7
CIRCUIT DESCRIPTION
2-2 Pin description
Pin No. Name I/O Description
1 VOL_DT O Electric VOL IC • communication data
2 VOL_CK O Electric VOL IC • communication clock
3 - O Not used
4 DISP_CE O Display ucom • communication CE
5 DISP_OUT O Display ucom • communication data output
6 DISP_IN I Display ucom • communication data input
7 DISP_CLK O Display ucom • communication clock
8 BYTE - Ucom mode data bus setting
9 CNVss - Ucom mode • inner ROM
10,11 - - Not used
12 RESET I Ucom reset
13 Xout O Ucom oscillation 10MHz output
14 Vss - GND
15 Xin I Ucom oscillation 10MHz input
16 Vcc - Power supply
17 NMI - Ucom compulsion thrust
18 - O Not used
19 CE I Ucom CE
20 REM I Remote control input
21 DISP_RST O Display ucom reset
22 LCD_BL O LCD backlight (Dimmer)
23 POWER O Power supply circuit H: ON
24 LED_EJECT O LCD • EJECT(Dimmer)
25 BACK_V_CHK O Backup voltage check circuit H: ON
26 BACK_V_ON O Backup charge H: ON
27 MECHA_CE O MD mecha. ucom CE
28 MECHA_RST O MD mecha. reset L: RESET ON
29 MECHA_RXD I MD mecha. communication input
30 MECHA_TXD O MD mecha. communication output(N-ch)
31~34 - - Not used
35 TIRLER_TXD O Titular communication output
36 TIRLER_RXD I Titular communication input
37 SDATA I/O Serial data (SL16)
38 SBUSY I/O Serial busy (SL16)
39 RDY I Extension bus control
40 - - Not used
41 HOLD I Extension bus control
42~61 - - Not used
62 Vcc - Ucom power supply (5V)
63 - - Not used
64 Vss - Ucom power supply (GND)
65~74 - - Not used
75 AMUTE O Analog mute
76,77 - - Not used
78 LED_REC O LED REC
79 - - Not used
80 LED_STBY O LED STANDBY
81~88 - - Not used
89~91 KR0~2 I Key return
92 BACK_V I Backup voltage check
93 INISW I Destination switch H: except J type
94 XY_POSITION I X-Y position
95 I_PROTECTION I Current protection
96 AVss - A/D power supply (GND)
97 - - Not used
98 Vref - A/D reference voltage (5V)
99 AVcc - A/D power supply (GND)
100 VOL_LEN O Electric VOL IC • communication data latch
4
CIRCUIT DESCRIPTION
Voltage(V) KR0 (89) KR2 (91)KR1 (90)
Threshold
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
2.50 stop ff/level_up -----
2.09
1.67 down up -----
1.25
0.88 fb/level_down play/pause -----
0.42
0.00 rec mode -----
(X33)CI2 (X33)IC24
MNT0
ATRAC
MD ucom
AD/DA
MNT1
CXD2654R MNT2
MNT3
(X25)IC11
SWDT
SCLK CTXD
XLAT CRXD
SRDT
SENS
XRST
SQSY
DQSY
(X33)IC12
RECP
XINT ADDARST
TX EMPHA
LDON
CXA2523AR RMS
HMUTE
(X33)IC6 SRVMOD
E2PROM
MECHA
RF amp
SCL
SDA
POWER
IDSW MUTE
HEADPOS MUTE_BAR
MDM-06 DISCIN RESET
STTLMT CE
LOADIN
LOADOUT BITRATE
2-3 Key matrix
3. MD mechanism microprocessor HD6432227N01FA(X33: IC24)
DM-VH7
3-1 Microprocessor periphery block diagram
5
DM-VH7
CIRCUIT DESCRIPTION
3-2 Pin description
Pin No. Name I/O Description
1 SCL O E2PROM clock
2 SDA I/O E2PROM data
3~11 - O Not used
12 VCC - VDD/power supply
13 - - Not used
14 VSS - GND
15~30 - - Not used
31 SRVMOD O X-Y position output
32~34 - - Not used
35 MUTE_BAR O Mute L:MUTE ON
36 POWER O Power ON/OFF (Periphery circuit power supply )
37 MUTE O Mute
38 ADDARST O AD / DA converter reset
39 EMPHA O Emphasis
40 LOADIN O Mecha. loading motor IN direction moving
41 LOADOUT O Mecha. loading motor OUT direction moving
42 AVSS - A/D GND
43 STTLMT I Pickup position switch
44 DISCIN I DISC insert detection
45 - - Not used
46 BITRATE I MD ucom communication speed changeover
47 HEADPOS I Head position (PLAY/REC) switch (AD)
48 IDSW I Mecha. DISC protection/high reflection/low reflection switch (AD)
49~52 - - Not used
53 Vref - A/D reference voltage
54 AVCC - A/D power supply
55,56 MODE0,1 I VDD/mode (MD0,MD1,MD2)=(1,1,1)
57,58 - - Not used
59 RESET I Reset input
60 NMI I VDD/non mask able thrust
61 STBY I VDD/hardware standby input
62 VCC - VDD/power supply
63 XTAL I Clock inverse input
64 VSS - GND
65 EXTAL - Clock input
66 FWE I GND(Flash ROM writing permission)
67 MODE2 I VDD/mode (MD0,MD1,MD2)=(1,1,1)
68~74 - - Not used
75 CE I Ucom CE
76 CTXD O MD ucom transmit data
77 CRXD I MD ucom receive data
78 DQSY I DIN sub-Q thrust
79,80 - - Not used
81 SQSY I EFM/ADIP SYNC thrust
82 XLAT O ACRIC/ATRAC en/decoder IC latch
83 SWDT O ACRIC/ATRAC en/decoder IC output data
84 SRDT I ACRIC/ATRAC en/decoder IC input data
85 SCLK O ACRIC/ATRAC en/decoder IC clock
86 HMUTE O Pull up/over writing head mute output (TX inverse)
87 SENS I ACRIC/ATRAC en/decoder IC SENS (inner status)
88 MNT3 I ACRIC/ATRAC en/decoder IC spindle rock
89 MNT2 I ACRIC/ATRAC en/decoder IC busy
90 MNT0 I ACRIC/ATRAC en/decoder IC FOK
6
CIRCUIT DESCRIPTION
Pin No. Name I/O Description
91 MNT1 I ACRIC/ATRAC en/decoder IC shock (track jump) detection
92 XINT I ATRAC thrust
93~95 - - Not used
96 TX O ACRIC/ATRAC en/decoder IC TX (Recording data output enable)
97 RECP O ACRIC/ATRAC en/decoder IC RECP (Laser power changeover)
98 XRST O ACRIC/ATRAC en/decoder IC reset
99 LDON O Laser ON
100 RMS O Pickup frequency changeover
DM-VH7
3-3 Port control
EBITRATE (46 pin): UART communication speed
changeover
Input voltage Bit rate
Vref × 1.0 9600bps
~
Vref × 0.8 14400bps
~
Vref × 0.6 28800bps
~
Vref × 0.4 33600bps
~
Vref × 0.2 38400bps
~
Vref × 0.0 19200bps
EHEADPOS(47pin): Head position detection
Input voltage Head position
Vref × 1.0 OFF
~
Vref × 0.62 PLAY position
~
Vref × 0.45 REC position
EIDSW(48 pin): DISC type detection
Input voltage DISC type
Vref × 1.0 LOW REFLECTION DISC
(PROTECT ON)
~
Vref × 0.69 LOW REFLECTION DISC
(PROTECT OFF)
~
Vref × 0.32 HIGH REFLECTION DISC
4. LCD display microprocessor
HD6433297A17F(X25:IC12)
4-1 Description
Pin No. Name I/O Description
1 DO O Communication data output
2 DI I Communication data input
3 CLK I Communication clock input
4 RESET I Ucom reset
5 NMI I (Non mask able thrust)
6 Vcc - Ucom power supply
7 STBY I Ucom standby
8 Vss - Ucom power supply)GND)
9 XTAL - ucom OSC(16MHz)
10 EXTAL I ucom OSC(16MHz)
11 MD1 I Ucom mode MD0/MD1
12 MD0 I Ucom mode inner ROM
extension mode :
13 AVss - Ucom A/D power supply(GND)
14~21 - - Not used
22 AVcc - Ucom A/D power supply
23~30 - - Not used
31 Vcc - Ucom power supply
32~39 - - Not used
40 Vss - Ucom power supply (GND)
41~47 - - Not used
48 A0 O LCD drive control
49~56 D0~D7 I/O LCD drive control
57 - - Not used
58 LAT I Communication latch /thrust
59 - I Not used
60 RD O LCD drive control
61 WR O LCD drive control
62 CS1 O LCD drive control
63 - - Not used
64 - - Not used(Pull up)
7
DM-VH7
Key Description
O.T.E. [LCD (LED)]
[all on (blink)] or [off (off)]
STOP Cancel of mode
Key Operation
UP/DOWN Select parameter and mode.
PLAY Fix items. Change of display in every check.
STOP Cancel or back of test mode.
Key Operation
DOWN(SHIFT+) Select servo of PIT or GROOVE
PLAY(SHIFT+) Servo on
REC Pickup stops to move. Skip modes.
STOP(SHIFT+) Servo off
MODE Display change.
UP(SHIFT+) Servo on/off
F F Pickup moves outwards when press FF key
F B Pickup moves inwards when press FB key
(SHIFT+): Show the "SHIFT" on the display by pressing the O.T.E. key
1. Setting of Continuous Playback Mode
No. Key
1 UP/DOWN Select [CPLAY MODE]
2 Load disc
3 PLAY [CPLAY MID]
[c=xxxx a=yy] error
(xxxx=C1 error, yy=ADIP error)
4 MODE [CPLAY(zzzz)] CPLAY address
(MID=0300h, OUT=0700h, IN=0030h cluster)
5 MODE [h✽✽✽✽d@@@@] address
(✽✽✽✽=current head address, @@@@=ADIP address)
In No.5, Display shows [-] if can't read disc.
2. Change of Playback Points(in continuous playback mode)
No. Key
Display/Function
Display/Function
1 PLAY [CPLAY OUT]
2 Carry out No.4 and 5 in the above table.
3 PLAY [CPLAY IN]
4 Carry out No.4 and 5 in the above table.
5 STOP [CPLAY MODE]
6 EJECT Disc out
1. Continuous Recording Setting
No. Key Display/Function
1 UP/DOWN Select [CREC MODE]
2 Load the recordable disc
3 PLAY [CREC MID]
4 PLAY [CREC (zzzz)] CREC address
(0300h cluster=recording start point)
5 MODE [h✽✽✽✽d@@@@] address
6 MODE [c=xxxx a=yy] error
7 MODE [CREC (zzzz)]
8 STOP [c=xxxx a=yy]
2. Change and End of Recording Points
1 Carry out No.1 to 3 in the above table Select[CREC MID]
2 UP [CREC OUT]
3 PLAY [CREC (zzzz)] CREC address
(0700h cluster=recording start point)
Carry out No.5 to 8 in the above table
4 Carry out No.1 to 3 in the above table
5 PLAY Select [CREC MID]
6 UP(twice) Select [CREC IN]
7 PLAY [CREC (zzzz)] CREC address
(0300h cluster=recording start point)
Carry out No.5 to 8 in the above table
8 EJECT Disc out
Starting address is the followings.
IN=30h cluster, MID=300h cluster, OUT=700h cluster
LCD Display Descriptions
PLAY(logo) Servo on
PAUSE(logo) Tracking servo on
REC(logo) Record (laser write power)
GRV Servo groove mode
CLV-S Rough servo clock
CLV-A Spindle lock
RECORD Recordable disc or no disc
No. Display Description Section
1 TEMP ADJUST
The work of adjustment is
6-5
unnecessary in this mode
2 LDPWR ADJUST Laser power adjustment 6-6
3 LDPWR CHECK Laser power check 6-6
4 EFBAL ADJUST Traverse adjustment 6-7
6 FBIAS ADJUST Focus bias adjustment 6-8
5 TE B. ADJUST Automatic EF balance adjustment.
7 CPLAY MODE Continuous playback mode 5-5
8 CREC MODE Continuous recording mode 5-6
9 STT-LIMIT SW
Check the mechanism start
–
limit SW position
10 JUMP MODE Track jump checking mode –
11 SRV DAT READ Servo data reading –
12 EEP MODE E2PPROM data reading or rewrite –
13 EEP INITIAL E2PROM data initializing –
CIRCUIT DESCRIPTION
5. TEST MODE
5-1 How to Setting and Cancel Test Mode
Setting: While pressing the ON/STANDBY and MODE
keys, insert the power cord to the wall outlet.
Cancel: Pull out the power cord.
Mechanism Initialization
Setting: While pressing the EJECT key, insert the power
cord to the wall outlet.
Display shows [INITIALIZE]. Mechanism is in normal
mode after unload the disc if it loaded
Display
Setting: While pressing the MODE key, insert the power
cord to the wall outlet.
Cancel: Pull out the power cord.
Key Operation for Ajustment
5-2 Remaind Keys Operation
Caution: Data of E2PROM will be erased if pressed
O.T.E. key for more 3seconds.
For more information on each adjustment mode, refer to
each section of 6, "Electrical adjustment".
If other adjustment mode has been entered incorrectly,
press the STOP key to exit the mode.
* The number 9 - 13 are not used for service. If these
mode have been entered incorrectly, press the STOP
key immediately to exit the mode. Specially, do not use
EEP INITIAL. (E2PROM data has initialized if used it.)
5-5 Continuous Playback Mode
5-6 Continuous Recording Mode
5-3 Display of Mechanism operation in Test Mode
5-4 Selection of test mode
13 test modes are selected by pressing UP/DOWN keys.
8
1. The recording start addresses of IN, MID, and OUT
are described below.
IN 30H cluster
MID 300H cluster
OUT 700H cluster
2. An erasure prevention control is not detected in the
test mode. Be careful not to enter the continuous
recording mode using a disc containing the data that
should not be erased.
3. Do not record continuously for more than five
minutes.
4. Take care that no vibration is applied during
continuous recording.
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