How it Works
Kenwood
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DM-SE8
Service Manual
22 pgs3.37 Mb0
Table of contents
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Kenwood DM-SE7, DM-SE7G, DM-SE8, DM-SE9 Service Manual

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minidisc recorder
rec
level
O.T.E.
on/standby
D.R.I.V.E.
LR
DIGITAL IN
OPTICAL
SYSTEM
CONTROL
REC IN
PLAY OUT
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MINIDISC RECORDER
DM-SE7/SE7(G)/SE9
SERVICE MANUAL
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© 1997-11/B51-5395-00 (K/K) 3191
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Indicator (B12-0318-04)
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Knob* (K29-)
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Optic receiving module (W02-1181-05)
Escutcheon* (B07-)
Front glass (B10-2372-03)
Metallic cabinet* (A01-)
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Knob* (K29-)
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Power cord bushing (J42-0083-05)
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Panel* (A60-)
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Phono jack (E63-0120-05)
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Rectangutar receptacle (E08-0311-05)
In compliance with Federal Regulations, following are reproduc-
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tions of labels on, or inside the product relating to laser product safety.
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KENWOOD-Crop. certifies this equipment conforms to DHHS
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Regulations No. 21 DFR 1040. 10, Chapter 1, Subchapter J.
DANGER : Laser radiation when open and interlock defeated. AVOID DIRECT EXPOSURE TO BEAM
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* Refer to parts list on page 21.
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Illustration is DM-SE9.
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AC power cord* (E30-)
Beware of condensation
When water vapor comes into contact with the surface of cold material, water drops are produced. If condensation occurs, correct operation may not be possible, or the unit may not function correctly. This is not a malfunction, however, and the unit should be dried. (To do this, turn the POWER switch ON and leave the unit as it is for several hours.)
Be especially careful in the following conditions:
• When the unit is brought from a cold place to a warm place and there is a large temperature difference.
• When a heater starts operating.
• When the unit is brought from an air-conditioned place to a place of high temperature with high humidity.
• When there is a large difference between the internal temperature of the unit and the ambient temperature, or in conditions where condensation occurs easily.
DM-SE7/SE7(G)/SE9
N O DIS
C

CONTENTS / ACCESSORIES / CAUTIONS

Contents

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CONTENTS / ACCESSORIES / CAUTIONS...............2
CIRCUIT DESCRIPTION.............................................3
PC BOARD ................................................................. 6
SCHEMATIC DIAGRAM............................................. 9

Accessories

Audio cord (E30-0615-05)
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Optical fiber (B19-1529-05)
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Batteries (2)
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System control cord (E30-2628-05)
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AC plug adapter (E03-0115-05)
EXPLODED VIEW .....................................................19
PARTS LIST...............................................................21
PARTS DESCRIPTIONS...........................................27
SPECIFICATIONS .......................................Back cover
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Remote control unit (A70-1153-05) : RC-MSE7 (A70-1169-05) : RC-MSE9
Battery cover (A09-0129-08 : RC-MSE9)
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(A09-0356-08 : RC-MSE7)
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Cautions

Note related to transprotaion 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).
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DM-SE7/SE7(G)/SE9
PROTECT 23
REFLECT 20
DISCIN 25
STTLMT 24
PHOTSW 21
RECSW 19
LOADIN 32
LOADOUT 31
DRDT 73 DEMPH 77 DDQSY 48
DLAT 76 DSUB1 80 DSUB2 79
DWDT 74
DCLK 75
FLDCE 3
SRCLAT 78
VLCK 26
VLDT 63
VOLLAT 71
SBUSY 81 SDATA 82
KR1 54 KR2 55 KR3 56
INISW 58
1 A16 2 A17
84 AD0 : : 91 AD7
92 A8 : : 99 A15
5 RD 6 WR 7 CS 8 ASTB
33 SCHNG 13 SCL 34 SDA
28 XLAT 15 SENS 30 MNT0 14 MNT2 12 XRST 35 TX 27 RECP 29 MNT3 45 XINT 47 SQSY 48 DQSY 50 MNT1
65 SRDT 66 SWDT 67 SCLK
16 POWER 72 MUTE 17 LDON 18 RMS 36 BACKCHK 44 REM 46 CE 59 BACKV 83 BACKON
uPD784215GF506
E2PROM
CXD2652AR
MDM-04
LC8904Q
LC75710NE
SM5844AF
EXDT10EXLAT11EXCK
4
Q1 Q2 FLRST Q3 ADRST Q4 DIGRS
DRIVE Q5
DINSEL Q6
EMPHA Q7
DARST Q8
RAM
(X25)IC21
(X33)IC6
(X33)IC2
(X25)IC11
(X14)IC1
(X25)IC13
(X25)IC2
(X25)J3
(X25)IC15
MECHA
ELECTRIC Vol.
SERIAL.

CIRCUIT DESCRIPTION

1. Main microprocessor : uPD784215GF506
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1-1 Microprocessor periphery block diagram

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DM-SE7/SE7(G)/SE9
CIRCUIT DESCRIPTION

1-2 Pin description

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No. Name I/O Description
1,2 A16,17 O SRAM address
3 FLDCE O FL display driver CE 4 EXCK O Extension port clock 5 RD O SRAM reading 6 WR O SRAM writing 7 CS O SRAM CS (L:SRAM enable) 8 STB O SRAMASTB 9 Vdd - Microcomputer power supply
10 EXDT O Extension port data
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11 EXLAT O Extension port latch 12 XRST I System IC reset 13 SLC O E2PROM clock 14 MNT2 I System IC BUSY 15 SENS I System IC SENS 16 POWER O POWER (H:Power on) 17 LDON O Laser ON (H:Laser diode ON) 18 RMS O Pickup microwave satisfactory (H:ON) 19 RECSW I Mechanism REC position switch (L:REC SW ON) 20 REFLECT I Disc high reflex / low reflex switch (L:High reflex) 21 PHOTSW - Mechanism PLAY position detection
22 (GND)TEST - Microcomputer power supply 23 PROTECT I Disc protect switch 24 STTLMT I Mechanism pickup position switch
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25 D1SCIN I Mechanism disc insertion switch (L:Disc out SW ON) 26 VLCK O SRC clock 27 RECP O System IC RECP 28 XLAT O System IC latch 29 MNT3 I System IC spindle LOCK 30 MNT0 I System IC FOK 31 LOADOUT O Loading motor OUT direction drive (L:Loading IN) 32 LOADIN O Loading motor IN direction drive (L:Loading OUT) 33 SCHNG O E2PROM data output change (H:SDA output) 34 SDA I/O E2PROM data 35 TX O System IC TX 36 BACKCHK O Back-up voltage check ON 37 Vdd - Microcomputer power supply 38 X2 O Oscillation element (12.5MHz) 39 X1 I Oscillation element (12.5MHz) 40 VSS - Microcomputer power supply
41,42 XT2,1 O Clock oscillation element (Unused)
43 RESET I Microcomputer reset 44 REM I Remote control input 45 XlNT I ATRAC interrupt 46 CE I Microcomputer CE 47 SQSY I SYNC interrupt 48 DQSY I Inner DlN interrupt 49 SSQSY I External DlR interrupt 50 MNT1 I System IC shock detection 51 Vdd - Microcomputer power
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52 +5V - A/D standard voltage
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(L:Phot sensor ON)
(L:Start limit SW ON)
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No. Name I/O Description
53 - I Unused
54~56 KR1~3 I Key return 1~3
57 - I Unused 58 INISW I Destination change 59 BACKV I Backup voltage detection 60 - I Unused 61 GND - Microcomputer power 62 - I Unused 63 VLDT O SRC data 64 +5V - D/A standard voltage 65 SRDT I System IC input data 66 SWDT O System IC output data 67 SCLK O System IC clock 68 CRXD I External unit receiving data 69 CTXD O External unit transmission data 70 CENA I External unit correspondence permission 71 VOLLAT O Electron volume latch 72 MUTE O MUTE terminal 73 DRDT I DIR reading data 74 DWDT O DIR, display driver data 75 DCLK O DIR / display driver clock 76 DLAT O DIR latch 77 DEMPH I DIR emphasis 78 SRCLAT O SRC latch
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79,80 DSUB2,1 I DIRSUB2,1
81 SBUSY O 16bit synchro BUSY 82 VLCK O 16bit synchro DATA
83 BACKON O Back-up voltage charge ON 84-91 AD0~7 O SRAM address / data 92-99 A8~15 O SRAM address / data
100 Vss - Microcomputer power
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DM-SE7/SE7(G)/SE9
CIRCUIT DESCRIPTION

1-3 Backup

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Each following condition is backup to the memory with
ON/OFF of the AC power.
• Information of TOC
• UTOC information (Settlement contents of “editing etc. of record, TRACK edit­ing, titles”)
• Condition of POWER ON/OFF
• Condition of REC INPUT
• Condition of AUTO/MANUAL
• Setting of DIGITAL REC LEVEL
• Contents of the presetting title
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1-4 Initial state

POWER =OFF REC INPUT =ANALOG AUTO MANUAL =AUTO PLAY MODE =TRACK REPEAT =OFF TIME DISPLAY =SINGLE(+) REC LEVEL =-12dB DRIVE =ON Preset title =PRE1 : Pops
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1-5 Way of resetting a microprocessor

When turning on while pressing EJECT key, DM-SE7/SE9 initializes and starts a microprocessor.
INI SW 58pin Description
1-6 Key matrix :
KR 0 - - - - - ­KR 1
KR 2 KR 3 -
*DM-SE7/SE9 doesn’t function. Mode for the inspection : It utilizes for the existence or non-
existence of the FL display.
• Way of setting Turn on the AC power while pressing STOP(7)key.
• Way of canceling Press STOP(7)key.
• Contents Press(¢)key or(4) key. Then, DM-SE9 becomes the following test mode. Press PLAY(3) key, to fix each test mode. To cancel each test mode, Press PLAY(3) key once again.
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• DOT TEST (It becomes “Niagara indication” when PLAY key is pressed.)
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=PRE2 : Rock =PRE3 : Classic =PRE4 : Jazz =PRE5 : Disco =PRE6 : Best Hits =PRE7 : Air Check =PRE8 : No. =PRE9 : Vol.
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High Overseas; KATAKANA uncorrespondence.
CYBER TITLER uncorrespondence.
Low Japan ; KATAKANA correspondence.
CYBER TITLER correspondence.
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-0.47V -1.46V -2.46V -3.46V -4.45V 4.47-5.0V
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*O.T.E *ATT UP *ATT -
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DISPLAY
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REC INPUT
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• SEG TEST (When PLAY key is pressed all FL are lighted. Indication changes cyclically as follows when ¢ or 4 key are pressed.)
• KEY TEST (For the mode for the production line, in the service, it does­n’t use.)

1-7 Extension IC

2. Adjustment

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Refer to the adjustment ( the page ) of the service manual
But, the key to operate is different as follows.
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“All FL light up”
“FL turn off the lights”
“KATAKANA”
“All FL light up”
PIN No. IC Port name I/O Explanation
4 Q1 - O DIN selector 1 5 Q2 FLDRST O FL driver reset 6 Q3 ADRST O A/D reset
7 Q4 DIGRST O DIN reset 14 Q5 DRIVE O Drive ON/OFF 13 Q6 DINSEL2 O DIN selector 2 12 Q7 EMPHA O Play emphasis ONÅ^OFF 11 Q8 DARST O D/A reset
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(B51-5387-00) of 1050MD/DM-5090/9090.
DM-SE7/SE9 1050MD/DM-5090/9090 Description
PLAY ENTER Decision of MODE STOP FADE / DELEAT Cancellation of MODE
PAUSE SET Go to the next step
DM-SE7/SE9 1050MD/DM-5090/9090 Description
STOP FADE / DELEAT continuation recording
FF FF periphery only while
FB FB internal circumference
- REC INPUT key, DM changes the
- REC MODE Spindle servo mode
O.T.E TITLE INPUT key, DM changes the
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A continuation replay /
are canceled. The thread moves to the
pressing a key. The thread moves to the
only while pressing a key. The continuation recording menu choice Every time pressing a
mode at the pit and the groove "
change (CLVS and A) Every time pressing a
contents of the display.
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MD MECHANISM UNIT
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MD CONTROL UNIT
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Refer to the schematic diagram for the value of resistors and capacitors.
FHJLNGIKMO
PC BOARD(Component side view
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Refer to the schematic diagram for the value of resistors and capacitors.
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