Nakamichi DVD-15 User manual

1
DVD-15
5 Disc MusicBank DVD Changer
Service Manual
R
CONTENTS
1. GENERAL .............................................................................................................................. 2
2. REMOVAL PROCEDURES.................................................................................................... 4
3. ELECTRICAL ADJUSTMENT ............................................................................................... 9
3-1 Measurement instruments and jigs .................................................................................. 9
3-2 Parts location for adjustment............................................................................................ 9
3-3 Adjustment Procedure.................................................................................................... 10
3-4 RAM Clear...................................................................................................................... 11
4. MECHANICAL ASS’Y AND PARTS LIST ........................................................................... 12
4-1 Synthesis Ass’y .............................................................................................................. 12
4-2 Mechanism Ass’y DVD-15 (A01) ................................................................................... 14
4-3 Motor Chassis EX Ass’y (B01) ....................................................................................... 16
4-4 Loading EX Ass’y ADJ-3 (B02) ..................................................................................... 17
4-5 DVD Traverse Ass’yADJ-3 (B03) ................................................................................... 19
4-6 Pakage Ass’y and Accessory Ass’y ............................................................................... 20
5. ELECTRICAL PARTS LIST ................................................................................................. 21
6. RECOMMENDED SPARE PARTS LIST .............................................................................. 26
7. IC BLOCK DIAGRAMS........................................................................................................ 27
8. SPECIFICATIONS................................................................................................................49
For Schematic Diagrams, and Mounting Diagrams, see the separate volume.

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1. GENERAL
1.1 Product Code
V685
1.2 Destinations
BS, CAN, CH, DA, EP, HK, JPN, OTR, TW, USA,
KR, AUS
Abbreviations
CAN - Canada CH - China
DA - South America EP - Europe
HK - Hong Kong JPN - Japan
OTR - Other TW - Taiwan
U.K. - United Kingdom USA - U.S.A.
KR - Korea AUS - Australia
1.3 Cautions / Warnings
(1) Product Safety Notice
Parts marked with the symbol in the schematic dia-
gram have critical characteristics.
Use ONLYreplacement parts recommended by the
manufacturer. It is recommended that the unit be oper-
ated from a suitable DC supply or batteries during initial
check-out procedures.
(2) Leakage Current Check / Resistance Check
Before returning the unit to the customer, make sure
you make either (1) a leakage current check or (2) a line
to chassis resistance check. If the leakage current ex-
ceeds 0.5 milliamp, or if the resistance from chassis to
either side of the power cord is less than 240 k ohms,
the unit is defective.
WARNING–DO NOT return the unit to the customer
until the problem is located and corrected.
(3) Protection of Eyes from Laser Beam
To protect eyes from invisible laser beam during servic-
ing, DO NOT LOOK AT THE LASER BEAM on the
Changer.
(4) Laser Caution
CAUTION
Adjusting the knobs, switches, and controls etc. or tak-
ing actions not specified herein may result in a harmful
emission of laser beams. This Changer must be adjusted
and repaired only by qualified service personnel.
OBSERVERA!
Sådana inställningar av rattarna, omkopplarna eller
övriga kontrollknappar som inte är beskriva i
bruksanvisningen kan resultera i farlig laserutstrålning.
Justering eller reparation av denna kompaktskivspelare
skall endast utföras av kvalificerad servicepersonal.
OBS!
Indstilling af knapper, cmskiftere og øvrige
kontrolknapper, som ikke følger den i brugsanvisningen
beskrevne måde, kan resultere i farlig laserudstråling.
Justering eller reparation af denno CD-afspiller må kun
udføres af kvalificeret servicepersonale.
OBS!
Justering av ratt, brytere og kontroller andre enn de som
er beskrevet her, kan resultere i farlig laserbestråling.
Justeringeller reparasjon av dennekompaktdiskspilleren
ma bare utføres av kvalifiserte fagfolk.
HUOMAUTUS
Jos nuppeja, kyikimiä ja säätimiä ym, säädetään tai
laitetta käytetään toisella tavalla kuin on selostettu,
tuloksena saattaa olla vaarallista lasersäteiden vuotoa.
CD-soittimen säätö ja korjaus on jätettävä aina
asiantuntevan huoltoteknikon tehtäväksi
CLASS 1 LASER PRODUCT
KLASSE 1 LASER PRODUKT
LUOKAN 1 LASER LAITE
KLASS 1 LASER APPARAT
CAUTION ;
INVISIBLE LASER RADIATION WHEN OPEN
VARNING ;
OSYNLIG LASERSTRALNING NAR DENNA
AND INTERLOCKS DEFEATED. AVOID EXPOSURE TO BEAM.
DEL AR OPPNAD OCH SPARREN AR URKOPPLAD.
ADVARSEL ;
USYNLIG LASERSTRALING VED ABNING,
VARO ;
AVATTAESSA JA SUOJALUKITUS OHITETTAESSA
NAR SIKKERHEDSAFBRYDERE ER UDE AF FUNKTION
ALA KATSO SATEESEEN !
BETRAKTA EJ STRALEN !
UNDGA UDS TTELSE FOR STRALING.
OLET ALTTIINA NAKYMATTOMALLE LASERSATEILYLLE.
THIS DVD PLAYER IS CLASSIFIED AS A CLASS 1 LASER
PRODUCT. THE CLASS 1 LASER PRODUCT LABEL IS LO-
CATED ON THE REAR EXTERIOR.

3
•How to prevent or discharge the impressed elec-
tricity
Please refer to the following items.
1) Grounding
When you repair a laser pickup, first ground the human
body, as well as the measuring instruments and other
tools (with particular caution to the soldering iron). What's
more, your workbench and floor should desirably be
grounded using a conductive sheet or copper plate. Be
carefulso as not toletyour clothes touch thelaserpickup,
as static electricity on the clothes may be released even
if your body is grounded.
2) Discharge of electricity
Be sure to discharge electricity from objects brought into
contact with the laser pickup (i.e., soldering iron, twee-
zers, probes, volt-ohm-meter probes, etc.) before start-
ing work by contacting them with the DVD player's chas-
sis. Also, never touch the laser pickup while power is
applied.
3) Soldering iron
The soldering iron for use in repair work should be: (1) a
ceramic soldering iron, (2) a soldering iron with its metal
part grounded, or (3) a soldering iron whose insulation
resistance after power application is 10 M-ohm or more
at 500 VDC. Soldering should be completed promptly,
at a soldering iron temperature of 320°C ideally. (39W).
Asolderingironheated above thistemperaturecan break
down the laser diode.
GENERAL
1.4CautionforhandlingLaserPickupofDVDPlayer
[Electric Influence because of impressed electricity]
Laser pickup of a DVD player is weaker and more sen-
sitive than that of CD player, it is possible to damage
the pickup under specific electrical environments, such
as impressed or leaked electricity, including static elec-
tricity. Electricity that is impressed during modification
for zone coding, or through updating the micro proces-
sor and so forth, may influence the laser pickup.
Prevention of Impressed Electricity
•In general
It is very difficult to specify why and how static electric-
ity is impressed. It is important to thoroughly ground
the working bench and fasten the antistatic electricity
wrist band, as well as carry out the daily management
of isolating the resistor of the soldering iron and the
leaked current in the working room.
Unfortunately, it is impossible for us, even as the sup-
plier, to assure that all these conditions are met at any
distributor or subsidiary that does not have an identical
situation to that of the manufacturing site. Consequently,
we do not recommend any modification for zone cod-
ing, that can be a negative factor against quality assur-
ance, and we consider pickup failure of any unit modi-
fied for zone coding to be out of warranty.
Note: A precise digital tester is needed to measure the leaked current.
Condition of Soldering lron
Type Output Wattage Tip Temperature Isolated Resistance Leaked Current
For IC or LSl 13-18W 300±40°C≥100MΩ≤1.0µA
For Elec. Part 23-30W 360±40°C≥50MΩ≤2.0µA

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2. REMOVAL PROCEDURES
• Location of Major Parts
2.1 Top Cover (Refer to Fig. 2-2)
1) Remove the 8 screws and detach the Top Cover from the
main body.
Fig. 2-2
Fig. 2-1 Top View
(The Mechanism P.C.B. Ass’y is constructed on the DVD Mechanism Block.)
P-Supply P.C.B. Ass'y Mechanism BLK Ass'y
Digital P.C.B. Ass'y
Output P.C.B. Ass'y
DVD Main P.C.B. Ass'y
(Bottom side of Mechanism BLK)
LED P.C.B. Ass'y H.P P.C.B. Ass'y
Power-SW P.C.B. Ass'y M-Trance P.C.B. Ass'y
Front P.C.B. Ass'y
REG 5V P.C.B.Ass'y
Diode P.C.B. Ass'y
REG 3V P.C.B.Ass'y

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2.2 Front Panel (Refer to Fig. 2-3)
1) Remove the 5 screws on the front panel.
2)Remove the screws holding the H.P P.C.B.Ass’y. The screws
can be reached by going through the hole in the left side
Power-SW P.C.B. Ass’y.
3) Disconnect the P702 on the P-Supply P.C.B. Ass’y and
disconnect the P530 and P200 on the Digital P.C.B. Ass’y.
4) Remove the front panel in front of you by pulling it outward,
keeping it level as you pull.
2.3 Mechanism Block (Refer to Fig. 2-4)
1) Disconnect the flexible cable from the P550 and P570 on
the Digital P.C.B. Ass’y.
2) Disconnect the P540 on the Output P.C.B. Ass’y.
3) Remove the 4 screws and detach the machanism from the
main body.
2.4 DVD Main P.C.B. Ass’y (Refer to Fig. 2-5)
1) Remove the 4 screws “1”on the DVD Main P.C.B.Ass’y.
2) Disconnect the three connectors “a”, “b”and “c”on the DVD
Main P.C.B.Ass’y.
2.5 Mechanism Ass’y (Refer to Fig. 2-5)
1) Remove the DVD Main P.C.B. Ass’y.
2) Remove the 8 screws "2" in the diagram, and then remove
the left and right plates "3".
Fig.2-3
Fig.2-4
Fig.2-5
Digital P.C.B. Ass'y
Mechanism Block
P570
P550 P540
11
2
3
3
2
a
b
c
DVD Main P.C.B. Ass'y
Mechanism Ass'y
REMOVAL PROCEDURES
P200
P530
P702
Digital
P.C.B. Ass'y
P-Supply P.C.B. Ass'y
H.P P.C.B. Ass'y

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2.6. Bottom Cover EX Ass'y, Top Cover EX Ass'y
and F Panel EX Ass'y (Refer to Fig. 2-7)
1) Remove the 6 screws "1" (M2.6x5 + Pan (#0 Type 3)) and
detach the Bottom Cover EX Ass'y.
2) Remove the 2 screws "2" (M2.6x3 + Pan), and detach the
Top Cover EX Ass'y and F Panel EX Ass'y.
2.7. Mechanism P.C.B. Ass'y (Refer to Fig. 2-7)
1) Remove the Bottom Cover EX Ass'y, Top Cover EX Ass'y
and F Panel EXAss'y. See item 2.6.
2) Shorting the laser diode shorting land of the DVD Traverse
Ass'y:
Short the laser diode shorting lands (2 places shown by the
arrows) with a soldering iron before removing the Mecha-
nism P.C.B.Ass'y.
Note: Use a soldering iron whose metal part is grounded or
a ceramic soldering iron.
CAUTION: Do not disconnect the Flexible Cable from the
connector P200 on the Mechanism P.C.B. Ass'y unless the
laser shorting lands (2 places) are shorted.
[Shorting the Laser Diode Shorting Lands of the DVD Traverse
Ass'y]
•Note when reassembling:
Unsolder the laser diode shorting lands after reassembling
the Mechanism P.C.B.Ass'y.
3) Remove 1 screw "3" (M2.6x3.5 + Pan (#0 Type 3)) and 1
screw "4" (M2.6x8 + Pan).
4) Disconnect the Mecha Flexible P.C B. Ass'y "5" by pulling
the edges of the connector CP103 "6" on the Mechanism
P.C.B. Ass'y to unlock the connector edges.
5) Pull the edges of the connector CN300 "7" on the Mecha-
nism P.C.B. Ass'y to unlock the connector edges and care-
fully pull out the Traverse Flexible P.C.B. Ass'y.
6) Pull the edges of the connector CN200 "8" on the Mecha-
nism P.C.B. Ass'y to unlock the connector edges and care-
fully pull out the Pickup Flexible P.C.B. "9".
7) Carefully disconnect the 3 connectors CPI04 "10" (EX Mo-
tor Ass'y), CN500 "11" (Sled Motor Ass'y), and CN600 "12"
(Inner Switch)
8) Remove the Mechanism P.C.B. Ass'y from the Mechanism
Ass'y.
2.8. Loading EX Ass'y (Refer to Fig. 2-7)
1) Remove the Mechanism P.C.B Ass'y. See item 2.7.
2) Remove the 6 screws "13" (ST2.6x3 + Pan (#0 Type 3)), 1
screw "14" (M1.7x2.5 + Pan (#0 Type 3) (Black)), and 4
screws "15" (M2x2 + Pan (#0 Type 3) (Black)).
•Note when reassembling:
When reassembling the Mecha Flexible P.C B. Ass'y "5",
move it to the front side.
Be sure that the shutter is positioned in the center of the
shutter sensor on the Mecha Flexible P.C.B.Ass'y, when the
shutter of the Loading EX Ass'y is closed by hand,
3) Remove the EX Loading Chassis block "16" backward while
lifting its to the right side a little.
4) Remove the Loading EX Ass'y while lifting it.
•Note: Do not damage the CatchArmAss'y and the Loading
Link Ass'y of the Loading EX Ass'y.
2.9. DVD Traverse Ass'y(Refer to Fig. 2-7)
1) Remove the Loading EX Ass'y. See item 2.8.
2) Remove the 3 screws "17" (ST2 6x3 + Pan (#0 Type 3)) and
remove the EX Motor Ass'y.
3) Remove the 3 screws "18" (ST2.6x3 + Pan (#0 Type 3)) and
remove the EX Chassis Ass'y.
4) Remove the 4 pcs. of Damper Screw SL"19", 4 pcs of and
SUS Collar B "20", and 4 pcs of SUS Collar T "21", and
detach the DVD TraverseAss'y.
Notes:
1. Pay attention so as not to damage the Door Sensor P.C B.
of the Mecha Flexible P.C.B. "5".
2. Assemble the Door Sensor P.C.B. so as not it is inclined.
3. Be sure that the projection of the Front Door Ass'y can be
correctly inserted into the Door Sensor.
REMOVAL PROCEDURES

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Fig.2-7
REMOVAL PROCEDURES
2.8. Loading EX Ass'y
2.6. Bottom Cover EX Ass'y
2.6. Panel EX Ass'y
2.9. DVD Traverse
Ass'y
2.7. Mechanism
P.C.B. Ass'y
2.6. Top Cover EX Ass'y

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2.10 Pickup (Refer to Fig.2-8)
Caution: Do not remove or loosen screws that are not in-
cluded in this procedure.
Note: After reassembling the Pickup, you need to perform “Tilt
Adjustment”of the Pickup.
Preparation:
Since you need to reposition the screw F03 to the original po-
sition, check the current position before removing the screw
F03.
•Give a mark on the head of screw F03 to allow easy reposi-
tioning.
•Check the end position of the screw F03. It will be almost the
same as the bottom surface of the chassis.
1) Remove the DVD Traverse Ass’y. Refer to item 2.9.
2) Remove a screw F01 (M1.7x3.5+Pan CMT) and detach F02
(Hook L.S)
3) Give a mark to the screw F03 for repositioning.
4) Remove ascrew F03(Screw S) and detach F04/F05(Pickup
block).
F06 (SP Push Shaft) can be removed.
5) Pull out F04 (Shaft L) from F05 (Pickup).
Notes on reassembling:
•Assemble the screw F03 so that it is roughly positioned to
the original position.
•Perform “TiltAdjustment”. Refer to Stap 3 “TiltAdjustment”in
3.3 “Adjustment procedure”
Fig.2-8
REMOVAL PROCEDURES
Do not remove or loosen

9
3. ELECTRICAL ADJUSTMENT
3.2 Parts Location for Adjustment
Fig.3-1 Parts Location for Electorical Adjustment (DVD Main P.C.B. Ass’y)
Fig.3-2 Tilt Adjustment Screws (Mechanism Ass’y)
3.1 Measurement instruments and Jigs
1) DC Voltmeter
2)AC Voltmeter
3) Tracking Offset Meter LE-9055A or LTM-9055 (Leader Electronics Corp.)
4)A-BEX Vertical Deviation Test Disc TDV-562 (DA09206A)
5) SONY Test Disc Type 3

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Note: Perform the adjustment in the order of “CD LD ON”and
“DVD LD ON”as mentioned below:
1. Press the STOP ( ) button once.
The message will change as follows:
→ AS ADJUST → DVD LD ON
2. Adjust VR120 to obtain 0V ±10 mV DC on the DC voltmeter.
3. Press the FORWARD SKIP ( ) button once.
The following message will appear on the display,
→ CD LD ON
4. Adjust VR121 to obtain 0V ±10 mV DC on the DC voltmeter.
5. Press the FORWARD SKIP ( ) button again to select “DVD
LD ON”, and confirm that the DC voltage is at the level that it was
adjusted to in step 2. If there is any deviance to the DC voltage,
re-adjust.
6. Press the FORWARD SKIP ( ) button twice.
The following message will appear on the display.
CD LD ON → LD OFF
The pickup will then move to the innermost position and stops
there.
7. Proceed to the next step.
1. Press the STOP ( ) button once.
Be sure that the following message appears on the display.
→ MECHA ADJUST
2. Press the EJECT ( ) button and insert the DVD Test Disc.
3. Press the PLAY ( ) button to play back the disc.
4. Press the FORWARD SKIP ( ) button to play back the
Chapter 16 (outermost track).
5. Press the PAUSE ( ) button to pause the disc. (The disc will
keep turning.)
6. Turn Screw Ato obtain the minimum reading on the AC voltmeter .
7. T urn Screw Bto obtain the minimum reading on the AC voltmeter.
8. Repeat steps 6 and 7 several times until the minimum readings
are obtained.
9. Press the EJECT ( ) button to eject the disc.
10.Proceed to the next step.
STEP ITEM SIGNAL
SOURCE OUTPUT CONNECTION ADJUSTMENT REMARKS
AS
Adjustment DC Voltmeter between
TP120(AS)(+)
and
TP107(VREF)(-)
on DVD Main
P.C.B.Ass’y
VR120
(for DVD,LD)
VR121
(for CD,LD)
Tilt
Adjustment DVD Vertical
Deviation
Test Disc
TDV-562
(DA09206)
AC Voltmeter
between
TP201(JI OUT)
(+)
and
TP105(DGND)(-)
on DVD Main
P.C.B.Ass’y
Tilt Screws
A and B
2
3
1. Connect each measuring instrument as follows:
•Connect a DC voltmeter between TP120 (AS) (+ terminal)
and TP107 (VREF) (- terminal) on the DVD Main P.C.B. Ass’y.
•Connect an AC voltmeter between TP201 (JI OUT) (+ termi-
nal) and TP105 (DGND) (-terminal) on the DVD Main P.C.B.
Ass’y.
•Connect a tracking offset meter between TP300 (DSCTE) (+
terminal) and TP107 (VREF) (-terminal) on the DVD Main
P.C.B.Ass’y.
2. While pressing and holding the STOP button, press the POWER
button, then enter standby mode. (the indicator will light orange).
3. Press the PAUSE ( ) button and DISC 3 button for more than 2
seconds to engage the test mode.
Confirm that the following message appears on the display.
DVD ADJUST →DISC 1 T -01
Eject button Forward Skip
button Play button
Pause button
Stop button
Disc 3 button
DVD Adjust
Mode
1
3.3 Adjustment procedure (Follow the next steps in order)
ELECTRICAL ADJUSTMENT