Apartofcontentsisadequate.
Re-issuing is under request.
AHK
SERVICE MANUAL
MINIDISC PLAYER
• This Service Manual is the "Revision Publishing" and replaces "Simple Manual"
(S/M Code No. 09-003-430-9T1).
BASIC MD MECHANISM : ZZG-5 B
S/M Code No. 09-007-430-9R2
REVISION
DATA
SPECIFICATIONS
Main unit
Playback systemMiniDisc digital audio system
Laser pickupSemiconductor laser
Sampling Frequency44.1 kHz
Number of channelsStereo: 2 channels
D/A converter1-bit
Frequency response40 to 20,000 Hz ± 4 dB
Wow and FlutterBelow measurable limit
OutputPhone jack
Maximum output level 8 mW + 8 mW (16 Ω)
Power requirementsDC 1.2 V using the supplied NI-MH
Battery lifeUsing the supplied rechargeable battery
20 to 20,000 Hz ± 1 dB (10 kΩ)
(±0.00 1% W.PEAK)
rechargeable battery MHB-901
DC 1.5 V using an LR6 (size AA) dry
cell battery
AC house current using an optional AC adaptor
Approx. 20 hours (with power save on:
approx. 26 hours)
Using an LR6 (size AA) dry cell battery
Approx. 35 hours (with power save on:
approx. 43 hours)
Using the supplied rechargeable battery and an
LR6 (size AA) dry cell battery
Approx. 60 hours (with power save on:
approx. 70 hours)
Maximum outsideApprox. 80 (W) X 20.4 (H) X 82.8 (D) mm
dimensions(31/4 X 13/16 X 33/6 inches) (excluding
• Design and specifications are subject to change without notice.
projected parts and controls)
rechargeable battery.
– 2 –
PROTECTION OF EYES FROM LASER BEAM DURING SERVICING
This set employs laser. Therefore, be sure to follow carefully
the instructions below when servicing.
WARNING!!
WHEN SERVICING, DO NOT APPROACH THE LASER
EXIT WITH THE EYE TOO CLOSELY. IN CASE IT IS
NECESSARY TO CONFIRM LASER BEAM EMISSION.
BE SURE TO OBSERVE FROM A DISTANCE OF MORE
THAN 30cm FROM THE SURFACE OF THE OBJECTIVE LENS ON THE OPTICAL PICK-UP BLOCK.
s Caution: Invisible laser radiation when
open and interlocks defeated avoid
exposure to beam.
s Advarsel: Usynlig laserståling ved åbning,
når sikkerhedsafbrydere er ude af funktion.
Undgå udsættelse for stråling.
VAROITUS!
Laiteen Käyttäminen muulla kuin tässä käyttöohjeessa
mainitulla tavalla saataa altistaa käyt-täjän
turvallisuusluokan 1 ylittävälle näkymättömälle
lasersäteilylle.
VARNING!
Om apparaten används på annat sätt än vad som
specificeras i denna bruksanvising, kan användaren
utsättas för osynling laserstrålning, som överskrider
gränsen för laserklass 1.
CAUTION
Use of controls or adjustments or performance of procedures other than those specified herin may result in
hazardous radiation exposure.
ATTENTION
L’utillisation de commandes, réglages ou procédures
autres que ceux spécifiés peut entraîner une dangereuse
exposition aux radiations.
ADVARSEL
Usynlig laserståling ved åbning, når sikkerhedsafbrydereer
ude af funktion. Undgå udsættelse for stråling.
This Compact Disc player is classified as a CLASS 1
LASER product.
The CLASS 1 LASER PRODUCT label is located on the
rear exterior.
CLASS 1LASER PRODUCT
KLASSE 1LASER PRODUKT
LUOKAN 1LASER LAITE
KLASS 1LASER APPARAT
Precaution to replace Optical block
(KMS-330A)
Body or clothes electrostatic potential could
ruin laser diode in the optical block. Be sure
ground body and workbench, and use care the
clothes do not touch the diode.
1) After the connection, remove solder shown in
right figure.
PICK-UP Assy P.C.B
Solder
– 3 –
DISASSEMBLY INSTRUCTIONS
About Disassembling and Reassembling
Service position can be established only by removing the PANEL, BOLT.
1. Removing the PANEL, TOP
(1) Remove the five screws “a”.
(2) Remove the PANEL, TOP.
*1 When re-attaching the PANEL, TOP, the arm should be engaged with the HLDR, CTRG.
2. Removing the PANEL, BOT
(1) Remove the screw “a” and the screw “b” and remove the two screws “c”.
(2) While being careful not to bend the screw of the screw hole, remove the PANEL, BOT.
– 4 –
3. Removing the HLDR, BATT and PWB, MAIN
(1) Remove the screw “a” and remove the HLDR, BATT.
(2) Short the PICK-UP short land and remove the three connectors b.
(3) Remove the screw “c” and the three screws “d”, then remove the PWB, MAIN.
*1: Take extra caution when attaching the HOLD SW.
*2: Take extra caution when attaching the BAT-CONTACT. In addition, take extra caution when attaching the OPEN SW that is
located on the rear of the PWB, MAIN.
– 5 –
4. Removing the HLDR, CTRG
(1) Bend the HLDR, CTRG in the direction of the arrow shown in the figure and remove the HLDR, CTRG.
5. Removing the mechanism and the FRAME , CENTER
(1) Remove the two screws “a” and remove the screw “b”.
(2) To remove the positioning hole “c” of the mechanism from the FRAME, CENTER, loosen the FRAME, CENTER in the direction
of the arrow and remove the mechanism.
* When attaching them, adjust the position of the HP JACK.
– 6 –
6. Removing the PICK-UP
(1) Remove the poly washer and remove the GEAR, A.
(2) Remove the screw “a” and remove the SPR-P, LEAD.
(3) Remove the shaft and the PICK-UP.
7. Removing the SLD, MOTOR
(1) Remove the poly washer and remove the GEAR, A.
(2) Remove soldering “a”
(3) Remove the two screws and remove the SLED MOTOR.
– 7 –
8. Removing the SLED MOTOR.
(1) Remove soldering “a”.
(2) Remove the screws “b1”, “b2” and “b3” and remove the SPINDLE MOTOR.
* To attach the SPINDLE MOTOR, slide it in the direction of the arrow and tighten the screws in order of “b1”, “b2” and “b3”.
C101 87-A10-770-080 0E C-CAP,V 0.1-10 K B
C102 87-A10-765-080 0E C-CAP,V 0.033-10 K B
C103 87-A10-766-080 0E C-CAP,V 0.047-10 K B
C104 87-A10-765-080 0E C-CAP,V 0.033-10 K B
C105 87-A10-765-080 0E C-CAP,V 0.033-10 K B
C106 87-A10-765-080 0E C-CAP,V 0.033-10 K B
C107 87-A10-765-080 0E C-CAP,V 0.033-10 K B
C108 87-A10-531-080 0E C-CAP,V 10P-50 D CH
C109 87-A10-523-080 0E C-CAP,V 2.0P-50 C CK
C110 87-A11-058-080 0E C-CAP,U 0.22-10 K B
C111 87-A10-561-080 0E C-CAP,V 0.01-16 K B
C112 87-A10-561-080 0E C-CAP,V 0.01-16 K B
C114 87-A10-770-080 0E C-CAP,V 0.1-10 K B
C115 87-A10-556-080 0E C-CAP,V 2200P-50 K B
C116 87-A11-049-080 0E C-CAP,U 1-6.3 K B
C117 87-A11-751-080 1A C-CAP,TN 22U-4 M P
C118 87-A11-050-080 1A C-CAP,TN 47U-4 M F95 A
C119 87-A10-826-080 1A C-CAP,S 1-10 K B
C120 87-A10-770-080 0E C-CAP,V 0.1-10 K B
C121 87-A11-751-080 1A C-CAP,TN 22U-4 M P
C122 87-A10-561-080 0E C-CAP,V 0.01-16 K B
C123 87-A10-554-080 0E C-CAP,V 1000P-50 K B
C124 87-A10-554-080 0E C-CAP,V 1000P-50 K B
C200 87-016-669-080 0E C-CAP,S 0.1-25 K B
C201 87-A11-050-080 1A C-CAP,TN 47U-4 M F95 A
C202 87-A10-770-080 0E C-CAP,V 0.1-10 K B
C203 87-A10-556-080 0E C-CAP,V 2200P-50 K B
C204 87-A10-671-080 0E C-CAP,V 0.022-16 K B
C206 87-A10-770-080 0E C-CAP,V 0.1-10 K B
C208 87-A10-770-080 0E C-CAP,V 0.1-10 K B
C209 87-A10-770-080 0E C-CAP,V 0.1-10 K B
C212 87-A11-751-080 1A C-CAP,TN 22U-4 M P
C214 87-A10-535-080 0E C-CAP,V 22P-50 J CH
PART NO.DESCRIPTIONREF. NO.KANRI
KANRI
NO.
DESCRIPTION
PART NO.
NO.
C215 87-A10-535-080 0E C-CAP,V 22P-50 J CH
C216 87-A10-770-080 0E C-CAP,V 0.1-10 K B
C217 87-A11-049-080 0E C-CAP,U 1-6.3 K B
C300 87-A11-049-080 0E C-CAP,U 1-6.3 K B
C301 87-A10-561-080 0E C-CAP,V 0.01-16 K B
C302 87-A10-561-080 0E C-CAP,V 0.01-16 K B
C303 87-A10-561-080 0E C-CAP,V 0.01-16 K B
C304 87-A10-561-080 0E C-CAP,V 0.01-16 K B
C305 87-A11-050-080 0E C-CAP,TN 47U-4 M F95 A
C307 87-A10-770-080 0E C-CAP,V 0.1-10 K B
C308 87-A10-770-080 0E C-CAP,V 0.1-10 K B
C309 87-A10-770-080 0E C-CAP,V 0.1-10 K B
C310 87-012-274-080 0E C-CAP,U 1000P-50 K B
C400 87-A11-049-080 0E C-CAP,U 1-6.3 K B
C401 87-A11-049-080 0E C-CAP,U 1-6.3 K B
C402 87-A10-556-080 0E C-CAP,V 2200P-50 K B
C403 87-A10-556-080 0E C-CAP,V 2200P-50 K B
C404 87-A10-556-080 0E C-CAP,V 2200P-50 K B
C405 87-A10-556-080 0E C-CAP,V 2200P-50 K B
C406 87-A10-556-080 0E C-CAP,V 2200P-50 K B
C407 87-A10-556-080 0E C-CAP,V 2200P-50 K B
C408 87-A11-049-080 0E C-CAP,U 1-6.3 K B
C409 87-A10-765-080 0E C-CAP,V 0.033-10 K B
C410 87-A10-765-080 0E C-CAP,V 0.033-10 K B
C411 87-A10-770-080 0E C-CAP,V 0.1-10 K B
C412 87-A10-770-080 0E C-CAP,V 0.1-10 K B
C413 87-A10-770-080 0E C-CAP,V 0.1-10 K B
C414 87-A11-050-080 -- C-CAP,TN 47U-4 M F95 A
C415 87-A11-046-080 1B C-CAP,TN 100U-4 M F95 B
C416 87-A11-751-080 0E C-CAP,TN 22U-4 M P
C417 87-A11-807-080 0E C-CAP,TN 4.7U-6.3 M P
C600 87-A11-806-080 0E C-CAP,TN 47U-6.3 M PSLB
C601 87-A10-557-080 0E C-CAP,V 3300P-25 K B
C602 87-A11-806-080 1B C-CAP,TN 47U-6.3 M PSLB
C603 87-A10-770-080 0E C-CAP,V 0.1-10 K B
C604 87-A10-770-080 0E C-CAP,V 0.1-10 K B
C606 87-A11-807-080 0E C-CAP,TN 4.7U-6.3 M P
C607 87-A11-049-080 0E C-CAP,U 1-6.3 K B
C608 87-A11-751-080 1A C-CAP,TN 22U-4 M P
C609 87-A10-561-080 0E C-CAP,V 0.01-16 K B
C610 87-A10-550-080 0E C-CAP,V 470P-50 K B
C611 87-A11-049-080 0E C-CAP,U 1-6.3 K B
C612 87-A10-561-080 0E C-CAP,V 0.01-16 K B
C613 87-A11-049-080 0E C-CAP,U 1-6.3 K B
C700 87-A11-751-080 1A C-CAP,TN 22U-4 M P
C706 87-A11-049-080 0E C-CAP,U 1-6.3 K B
C707 87-016-449-080 1A C-CAP,TN 10-4 M S
C708 87-016-449-080 1A C-CAP,TN 10-4 M S
C709 87-A11-058-080 0E C-CAP,U 0.22-10 K B
C710 87-A11-058-080 0E C-CAP,U 0.22-10 K B
C711 87-A11-049-080 0E C-CAP,U 1-6.3 K B
C712 87-A11-049-080 0E C-CAP,U 1-6.3 K B
C713 87-A11-751-080 1A C-CAP,TN 22U-4 M P
C715 87-A11-318-080 1B C-CAP,TN 220U-2.5 SVB2
C716 87-A11-318-080 1B C-CAP,TN 220U-2.5 SVB2
C717 87-A11-049-080 0E C-CAP,U 1-6.3 K B
C719 87-A11-049-080 0E C-CAP,U 1-6.3 K B
C720 87-A11-058-080 0E C-CAP,U 0.22-10 K B
C800 87-012-274-080 0E C-CAP,U 1000P-50 K B
CN100 87-A61-276-080 1B C-CONN,20P H 545482090
CN300 87-A61-020-080 1A C-CONN,4P H 54550-0417
CN700 87-A60-954-080 1B C-CONN,16P H 54548-1611
D300 87-A40-556-080 0E C-LED,CL-270HR RED
L100 87-A50-360-080 0E C-COIL, 47UH K NLFC252018
L101 87-003-245-080 0E C-COIL,2125 22UH K MLF2012
– 9 –
PART NO.
L200 87-003-245-080 0E C-COIL,2125 22UH K MLF2012
L300 87-005-769-080 0E C-COIL,2125 100UH K MLF2012
L400 87-A50-475-080 0E C-COIL, 10UH K NLFC201614
L401 87-A50-475-080 0E C-COIL, 10UH K NLFC201614
L402 87-A50-475-080 0E C-COIL, 10UH K NLFC201614
1PPITOPit / Group identification signal output. Hi=pit, Lo=group
2VCC–-Power supply pin of Matrix system.
3JIPhoto diode connection pin of pickup. Form RF signal with I pin.
4IIPhoto diode connection pin of pickup. Form RF signal with J pin.
5PIPhoto diode connection pin of pickup. Form TE signal with E pin.
6EIPhoto diode connection pin of pickup. Form TE signal with F pin.
7DI
8CI
9BI
10AI
11VEE–Ground pin of Matrix system.
12NC–Not used.
13LDDOAPC circuit output pin.
14NC–Not used.
15LDSIAPC circuit input pin.
16LDREFIInput pin for laser power setting.
17TBALIEF balance adjustment pin.
18TOFFIOffset adjustment pin of TE signal.
19FOFFIOffset adjustment pin of FE signal.
20AOFFIOffset adjustment pin of ABCD signal.
21SGCIVCA gain control pin.
22DSW0I
23DSW1I
Photo diode connection pin of pickup. It forms FE signal, ABCD signal, and WOO signal
Disc mode setting pin. Hi = Disc with low reflectance, Lo = Disc with high reflectance. Laser
OFF when DSW0 and DSW1 are in Lo.
Disc mode setting pin. Hi = Track in pin line, Lo = Track in group. Laser OFF when DSW0 and
DSW1 are in Lo.
24NC–Not used.
25VR–Pass-con connection pin for 1/2VCC.
26VCO1/2VCC output pin.
27FEOFocus error signal output pin.
28TEOTracking error signal output pin.
29ABCDOMain beam light amount signal output pin.
30HFLINIHEL signal forming pin in group mode.
31NC–Not used.
32BOTTOMOBottom signal output pin of RF signal.
33PEAKOPeak signal output pin of RF signal.
34HFLOHFL signal (Track ON/OFF) output pin
35RFVEE–Ground pin of RF system
36EQOORF equalizer output pin
37EQIIRF equalizer input pin.
38RFOORF signal output pin.
39CHFL–Capacitor connection pin for bottom hold.
40RFVCC–Power supply pin of RF system.
– 24 –
Pin No.Pin NameI/ODescription
41ADIPCROADIP carrier signal output pin.
42NC–Not used.
43WOOOWobble signal output pin.
44WOIIWobble signal input pin.
45SETRIBand pass filter setting pin.
46CAD–Capacitor connection pin of wobble signal for DC cut.
47BWCTIBand pass filter switch pin of wobble signal.
48SLEEPISleep mode. SLEEP=Hi: Power ON, SLEEP=Lo: Power OFF.
– 25 –
TEST MODE
The operations are displayed by LCD of the remote controller.
The keys of the main unit and remote controller can control shifts between operations.
* TEST MODE will ignore any abnormalities during operations. Plug off the power supply once any abnormalities are detected.
* HOLD switch of the remote controller will function in TEST MODE.
TEST MODE
1. How to activate and cancel Test Mode
(1) How to activate
Turn ON the power supply (set batteries) while pressing "VOL-" keys of the both main unit and remote controller.
Once Test Mode is activated, LCD will all light up and EL backlight will be turned ON.
Then it displays "Engineer MODE".
(2) How to cancel
Turn OFF the power supply to cancel Test Mode.
LCD Display when Test Mode is activated.
2. TEST MODE operations
There are 0~13 Test Modes, which are in the order of playback operations. These modes may be selected using VOL+/- keys, while they can be
started or stopped by pressing PLAY key. If a Test Mode is selected, a data will be displayed in "$XXXX".
*The values displayed in "$XXXX" are just IC internal data and their numerical values are of no significance (except for that of No.0, 13)
If any abnormalities were detected during the operation, it displays "Failed".
FOCUS ON!Focus servo ON during DISC IN
707Laser $XXLaser power adjustment value
808ABCD G $XXABCD AGC
909EF $XXXXTraverse adjustment value
100AFG $XXXXFocus Gain adjustment value
110BTG $XXXXTracking Gain adjustment value
120CFB $XXXXFocus Bias adjustment value
130D050c XeALL SERVO ON(Operate all of 1-12)
– 26 –
(1) Checking Laser Power
The display will repeat the string of OFF-> PIT Laser Power -> GRV Laser Power -> OFF every time DISP/SEARCH key of the remote
controller is pressed.
* Laser will not be luminescent.
• LCD Display
PIT Laser Power "LDPP $XX"
GRV Laser Power "LDPG $XX"
(2) Checking Sled Operation
Sled operation can be checked between Mode No. 0, 5~12.
Press F-SKIP to shift the pick-up towards the external circumference.
Press B-SKIP to shift the pick-up towards the internal circumference.
(3) Checking Switch Operation
OPEN/CLOSE SW and HOLD SW on a disc holder can be checked on LCD of the remote controller.
• Light up when the disc holder is closed.
• Alarm mark will light up when HOLD SW on the main unit is turned ON. While POWER SAVE is on, "–" will light up.
It does not display HOLD SW of the remote controller.
HOLD SW
OPEN/CLOSE SW
– 27 –
ADJUSTMENT MODE
1. How to activate and cancel Adjustment Mode
Operations in Adjustment Mode can be checked on the LCD of the remote controller.
TP1
IC300
IC200
TP4
TP5
TP3
(RF)
TP2
(VC)
MAIN circuit board Test Points
(1) How to activate
Turn ON the power (set batteries) while shorting TP1 of the main circuit board. Once Adjustment Mode is activated,
LCD will all light up and EL backlight will be turned ON.
Then it displays "Manufacture MODE".
Press "PLAY/STOP" key twice to display "IDLE".
(2) How to cancel
Turn OFF the power supply to cancel Adjustment Mode.
(3) Disc to be used
PIT disc (pre-mastered disc): TEST DISC (TGYS1)
GRV disc (MO disc): SONY MDW-74 (fully recorded)
– 28 –
(4) Note
• If a disc had any stains or scars on, the adjustment may not be completed.
• Always place the main unit with its cassette cover upward for adjustment.
• Do not make any manual adjustments.
• If the adjustment is incomplete, it displays "NO ADJ" during normal operation.
(5) Prohibitions
Do not press DSL key of the remote controller. If it was pressed, the mode will change to factory shipment mode.
If any data is changed in this mode, the unit will not be able to function normally.
If accidentally change into this mode, initialize EEPROM and re-do all the adjustments.
2. Adjustment Procedures
(1) PIT Disc (TEST DISC: TGYS1)
Insert the disc and press "PLAY" key (make sure to place main unit with its cassette cover upward).
LCD of the remote controller will be displayed "AUTO ADJ H" first, then "COMPLEAT"
(2) GRV DISC (SONY MDW-74)
Insert the disc and press "PLAY" key (make sure to place main unit with its cassette cover upward).
LCD of the remote controller will be displayed "AUTO ADJ L" first, then "COMPLEAT"
* If it displayed "Failed" during adjustment, it means that some abnormalities are deteced and the operation is
terminated.
(3) Checking RF Level and Error Rate
a)Press "–" key of the remote controller. Display "032c 00e" and playback.
Check the RF waveform (TP3) with an oscilloscope and it is within the 1.0±0.2Vp-p. If it
is not, follow the instruction below to make an adjustment.
• If the value is higher than 1.2Vp-p, short TP4.
• If the value is lower than 0.8Vp-p, short TP5.
b) Press "+" of the remote controller. Display "600c 00e" and playback.
Make sure if the error note is below "60e".
3. Others
(1) EEPROM Initialization
Press "DISPLAY" key, while it displays "IDLE", to start initialization of EEPROM.
Once the initialization is completed, LCD displays "EP INIT OK".
• Re-adjustments are required after every initialization. Otherwise it displaysÅuNO ADJUST!Åvduring the normal
operation.
(2) Checking Sled Operation
Press "F-SKIP" key, while it displays "IDLE", to shift puck-up towards the external circumference.
Press "B-SKIP" key, while it displays "IDLE", to shift puck-up towards the internal circumference.
19 8A-HM6-012-010 -- PANEL,BOT P<P>
19 8A-HM6-014-010 -- PANEL,BOT Y<Y>
A 87-078-186-010 0E SCRW-SR,1.4-1.8 CR L
B 87-HM1-243-010 0E S-SCREW,1.4-1.4CRNL
C 87-067-596-010 0E SCREW,V+1.4-3
D 87-078-187-010 0E SCRW-SR,1.4-4.5 CR L
E 8A-HM6-204-010 0E S-SCREW,+1.4-6.5 CR
F 8A-HM3-222-010 0E S-SCREW,+1.4-3.0 CR
G 8A-HM6-208-010 0E S-SCREW,+1.4-5.5 CR
H 8A-HM3-233-010 0E S-SCREW,+1.4-3.5
DESCRIPTIONREF. NO.KANRI
COLOR NAME TABLE
Basic color symbolColorBasic color symbolColorBasic color symbolColor
BBlackCCreamDOrange
GGreenHGrayLBlue
LTTransparent BlueNGoldPPink
RRedSSilverSTTitan Silver
TBrownVVioletWWhite
WTTransparent WhiteYYellowYTTransparent Yellow
LMMetallic BlueLLLight BlueGTTransparent Green
LDDark BlueDTTransparent OrangeGMMetallic Green
A 88-ZG6-224-010 0E S-SCREW,VBT+1.4-3
B 87-067-393-010 0E SCREW +1.4-1.4
C 87-067-569-010 0E POLY WASHER 0.83-2.5-0.25
D 8Z-ZG5-223-010 0E S-SCREW,VBT+1.4-2