JVC VS-DT6 User manual

VS-DT6
No.21104
May. 2002
COPYRIGHT 2002 VICTOR COMPANY OF JAPAN, LTD.
SERVICE MANUAL
Contents
Safety precautions
Preventing static electricity
Important for laser products
Disassembly method
Flow of functional operation
until TOC read
1-2
1-3
1-4
1-5
1-15
1-16
1-17
1-17
1-18 29
Error code
Maintenance of laser pickup
Replacement of laser pickup
Description of major ICs
VS-DT6
Area suffix
UP ---------------------------- Korea
CA-VSDT6SP-VSDT6 SP-VSDT6
COMPACT COMPONENT SYSTEM
COMPACTCOMPONENT SYSTEM
2
8
STANDBY/ON
PLAYMODE
REPEAT
FM MODE
TREBLEBASS
SET
CANCEL
SLEEPDIMMERDISPLAYFM/AM
AHB PRO
CLOCK
/TIMER OPEN/ CLOSE
VOLUME
MD/AUX
13
6
9
10
10
7
45
+

VS-DT6
1-2
1. This design of this product contains special hardware and many circuits and components specially for safety
purposes. For continued protection, no changes should be made to the original design unless authorized in
writing by the manufacturer. Replacement parts must be identical to those used in the original circuits. Services
should be performed by qualified personnel only.
2. Alterations of the design or circuitry of the product should not be made. Any design alterations of the product
should not be made. Any design alterations or additions will void the manufacturer`s warranty and will further
relieve the manufacture of responsibility for personal injury or property damage resulting therefrom.
3. Many electrical and mechanical parts in the products have special safety-related characteristics. These
characteristics are often not evident from visual inspection nor can the protection afforded by them necessarily
be obtained by using replacement components rated for higher voltage, wattage, etc. Replacement parts which
have these special safety characteristics are identified in the Parts List of Service Manual. Electrical
components having such features are identified by shading on the schematics and by ( ) on the Parts List in
the Service Manual. The use of a substitute replacement which does not have the same safety characteristics
as the recommended replacement parts shown in the Parts List of Service Manual may create shock, fire, or
other hazards.
4. The leads in the products are routed and dressed with ties, clamps, tubings, barriers and the like to be
separated from live parts, high temperature parts, moving parts and/or sharp edges for the prevention of
electric shock and fire hazard. When service is required, the original lead routing and dress should be
observed, and it should be confirmed that they have been returned to normal, after re-assembling.
5. Leakage currnet check (Electrical shock hazard testing)
After re-assembling the product, always perform an isolation check on the exposed metal parts of the product
(antenna terminals, knobs, metal cabinet, screw heads, headphone jack, control shafts, etc.) to be sure the
product is safe to operate without danger of electrical shock.
Do not use a line isolation transformer during this check.
Plug the AC line cord directly into the AC outlet. Using a "Leakage Current Tester", measure the leakage
current from each exposed metal parts of the cabinet, particularly any exposed metal part having a return
path to the chassis, to a known good earth ground. Any leakage current must not exceed 0.5mA AC (r.m.s.).
Alternate check method
Plug the AC line cord directly into the AC outlet. Use an AC voltmeter having, 1,000 ohms per volt or more
sensitivity in the following manner. Connect a 1,500 10W resistor paralleled by a 0.15 F AC-type capacitor
between an exposed metal part and a known good earth ground.
Measure the AC voltage across the resistor with the AC
voltmeter.
Move the resistor connection to each exposed metal part,
particularly any exposed metal part having a return path to
the chassis, and meausre the AC voltage across the resistor.
Now, reverse the plug in the AC outlet and repeat each
measurement. Voltage measured any must not exceed 0.75 V
AC (r.m.s.). This corresponds to 0.5 mA AC (r.m.s.).
1. This equipment has been designed and manufactured to meet international safety standards.
2. It is the legal responsibility of the repairer to ensure that these safety standards are maintained.
3. Repairs must be made in accordance with the relevant safety standards.
4. It is essential that safety critical components are replaced by approved parts.
5. If mains voltage selector is provided, check setting for local voltage.
Good earth ground
Place this
probe on
each exposed
metal part.
AC VOLTMETER
(Having 1000
ohms/volts,
or more sensitivity)
1500 10W
0.15 F AC TYPE
!
Burrs formed during molding may
be left over on some parts of the
chassis. Therefore, pay attention to
such burrs in the case of
preforming repair of this system.
In regard with component parts appearing on the silk-screen printed side (parts side) of the PWB diagrams, the
parts that are printed over with black such as the resistor ( ), diode ( ) and ICP ( ) or identified by the " "
mark nearby are critical for safety.
(This regulation does not correspond to J and C version.)

VS-DT6
1-3
Conductive material
(conductive sheet) or iron plate
(caption)
Anti-static wrist strap
Short land
CN601
CD servo board
Flexible wire
5. Attention when traverse unit is decomposed
*Please refer to "Disassembly method" in the text for the CD pickup unit.
Apply solder to the short land before the flexible wire is disconnected
from the connector on the CD pickup unit.
(If the flexible wire is disconnected without applying solder, the CD
pickup may be destroyed by static electricity.)
In the assembly, be sure to remove solder from the short land after
connecting the flexible wire.
Electrostatic discharge (ESD), which occurs when static electricity stored in the body, fabric, etc. is discharged,
can destroy the laser diode in the traverse unit (optical pickup). Take care to prevent this when performing repairs.
Preventing static electricity
1. Grounding to prevent damage by static electricity
Static electricity in the work area can destroy the optical pickup (laser diode) in devices such as CD players.
Be careful to use proper grounding in the area where repairs are being performed.
2. About the earth processing for the destruction prevention by static electricity
Ground the workbench by laying conductive material (such as a conductive sheet) or an iron plate over it
before placing the traverse unit (optical pickup) on it.
2-1 Ground the workbench
2-2 Ground yourself
Use an anti-static wrist strap to release any static electricity built up in your body.
In order to maintain quality during transport and before installation, both sides of the laser diode on the
replacement optical pickup are shorted. After replacement, return the shorted parts to their original condition.
(Refer to the text.)
Do not use a tester to check the condition of the laser diode in the optical pickup. The tester's internal power
source can easily destroy the laser diode.
3. Handling the optical pickup
1.
2.
Do not subject the traverse unit (optical pickup) to strong shocks, as it is a sensitive, complex unit.
Remove solder of the short land on the flexible wire after replacing the optical pickup. For specific details, refer
to the replacement procedure in the text. Remove the anti-static pin when replacing the traverse unit.
Be careful not to take too long a time when attaching it to the connector.
Handle the flexible wire carefully as it may break when subjected to strong force.
It is not possible to adjust the semi-fixed resistor that adjusts the laser power. Do not turn it.
4. Handling the traverse unit (optical pickup)
1.
2.
3.
4.

VS-DT6
1-4
Important for laser products
1.CLASS 1 LASER PRODUCT
2.DANGER : Invisible laser radiation when open and inter
lock failed or defeated. Avoid direct exposure to beam.
3.CAUTION : There are no serviceable parts inside the
Laser Unit. Do not disassemble the Laser Unit. Replace
the complete Laser Unit if it malfunctions.
4.CAUTION : The compact disc player uses invisible
laserradiation and is equipped with safety switches
whichprevent emission of radiation when the drawer is
open and the safety interlocks have failed or are de
feated. It is dangerous to defeat the safety switches.
5.CAUTION : If safety switches malfunction, the laser is able
to function.
6.CAUTION : Use of controls, adjustments or performance of
procedures other than those specified herein may result in
hazardous radiation exposure.
VARNING : Osynlig laserstrålning är denna del är öppnad
och spårren är urkopplad. Betrakta ej strålen.
VARO : Avattaessa ja suojalukitus ohitettaessa olet
alttiina näkymättömälle lasersäteilylle.Älä katso
säteeseen.
ADVARSEL : Usynlig laserstråling ved åbning , når
sikkerhedsafbrydere er ude af funktion. Undgå
udsættelse for stråling.
ADVARSEL : Usynlig laserstråling ved åpning,når
sikkerhetsbryteren er avslott. unngå utsettelse
for stråling.
REPRODUCTION AND POSITION OF LABELS
WARNING LABEL
CLASS 1
LASER PRODUCT
!
CAUTION
Please use enough caution not to
see the beam directly or touch it
in case of an adjustment or operation
check.
ADVARSEL: Usynlig laser-
stråling ved åbning, når
sikkerhedsafbrydere er ude
af funktion. Undgåudsæt-
telse for stråling. (d)
VARNING: Osynlig laser-
strålning när denna del är
öppnad och spärren är
urkopplad. Betrakta ej
strålen. (s)
CAUTION: Invisible laser
radiation when open and
interlock failed or defeated.
AVOID DIRECT EXPOSURE
TO BEAM. (e)
VARO: Avattaessa ja
suojalukitus ohitettaessa
oleta lttiina näkymättö-
mälle lasersäteilylle.
Älä katso säteeseen. (f)
ADVARSEL: Usynlig laser- stråling ved åbning, når sikkerhedsafbrydere er ude af funktion. Undgåudsæt- telse for stråling. (d)
VARNING: Osynlig laser- strålning när denna del är öppnad och spärren är urkopplad. Betrakta ej strålen. (s)
CAUTION: Invisible laser radiation when open and
interlock failed or defeated. AVOID DIRECT EXPOSURE TO BEAM. (e)
VARO: Avattaessa ja suojalukitus ohitettaessa oleta lttiina näkymättö- mälle lasersäteilylle. Älä katso
säteeseen. (f)

VS-DT6
1-5
Fig.1
Fig.2
Fig.3
A
B
Top panel
Bottom panel
Bottom panel
bb
a
Top panel
Front panel assembly
Disassembly method
<Main body section>
Removing the bottom panel
(See Figs. 1 and 2.)
1.
2.
3.
From the rear side of the main body, remove the
three screws Aattaching the bottom panel.
From the bottom side of the main body, remove the
two screws Battaching the bottom panel.
Remove the bottom panel in an upward direction.
1.
2.
Slide the top panel toward the rear (direction of the
arrow), disengage it from the engagement sections
aof the front panel assembly and engagement
sections bof the bottom chassis.
Remove the top panel in an upward direction.
Removing the top panel (See Fig. 3.)
Remove the bottom panel.

VS-DT6
1-6
Fig.4
Fig.5
Fig.6
CD mechanism
assembly
CN802
LED board
Push button
C
C
F
E
C
Claw c
Claws d
CN171 CN182
Wire holder
Bottom chassis
Front panel assembly
Claws d
Main board
Tie band
CN183
CN106
Hole on
the bottom chassis Front panel assembly
D
[Reference]
Before attaching the front panel assembly,
pass the card wire of the front panel assembly
through the hole on the bottom chassis.
After attaching the front panel assembly,
bundling the card wire and wires of the front
panel assembly using a wire holder and tie
band.
Removing the CD mechanism
assembly (See Fig. 4.)
1.
2.
3.
4.
From the top side of the main body, disengage the
claw cof the CD mechanism assembly and then
remove the push button.
Remove the five screws C, screw Dand screw E
attaching the CD mechanism assembly.
Disconnect the wire from connector CN802 on the
LED board.
Remove the CD mechanism assembly in an
upward direction.
Removing the front panel assembly
(See Figs. 5 and 6.)
1.
2.
3.
4.
5.
6.
Remove the tie band bundling the wires of the front
panel assembly.
Disconnect the wires from connectors CN106 and
CN182 on the main board.
Disconnect the card wires from connectors CN171
and CN183 on the main board.
Remove the wire holder holding the card wire of
the front panel assembly.
From the front side of the main body, remove the
two screws Fattaching the front panel assembly.
Disengage the claws dof the front panel assembly
from the bottom chassis and then remove the front
panel assembly in the direction of arrow.
Remove the bottom panel.
Remove the top panel.
Remove the bottom panel.
Remove the top panel.
Remove the CD mechanism assembly.

VS-DT6
1-7
Fig.7
Fig.8
CN101
CN111
Tie band
Tie band
CN102
Speaker board
Tuner board
Rear panel
AM antenna
terminal
FM antenna
terminal
HG
G
Speaker terminal Digital out terminal
CD mechanism
assembly wire
Notch
Bottom chassis
Main board
[Reference]
After connecting the wires to the speaker
board, bundle them using a tie band.
Insert the CD mechanism assembly wire into
the notch on the bottom chassis. (See Fig. 7.)
Removing the tuner board
(See Figs. 7 and 8.)
1.
2.
3.
Disconnect the card wire from connector CN111 on
the main board.
From the rear side of the main body, remove the
two screws Gattaching the FM/AM antenna
terminals on the tuner board.
Take out the tuner board from the bottom chassis.
Removing the speaker board
(See Figs. 7 and 8.)
1.
2.
3.
4.
Remove the tie bands bundling the wires on the
speaker board.
Disconnect the wires from connectors CN101 and
CN102 on the speaker board.
From the rear side of the main body, remove the
three screws Hattaching the speaker/digital out
terminals on the speaker board.
Take out the speaker board from the bottom
chassis.
Remove the bottom panel.
Remove the top panel.
Remove the CD mechanism assembly.
Remove the bottom panel.
Remove the top panel.
Remove the CD mechanism assembly.

VS-DT6
1-8
Fig.9
Fig.10
Fig.11
Wire clamp
Wire holder
Earth wire
Main board
CN191
CN194
CN192
CN181 Power amplifier
board
K
L
K'J
Main board
P
Power amplifier
board
Heat sink
Fan motor
CN192
CN193
Hook e
Hook e
Rear panel M
PN
N
Power transformer
K
Bottom chassis
[Reference] Attaching the main board
When attaching the screw K', attach the earth
wire of the main board at the same time.
When attaching the screw J, also attach the
wire holder together with it.
After connecting the wires to the connectors
CN192 and CN193 on the power amplifier
board, bundle them using wire holder.
[Reference]
It is not necessary to remove the wire from
the fan motor.
Removing the main board
(See Figs. 9 and 10.)
1.
2.
3.
4.
5.
6.
7.
Disconnect the wire from connector CN192 on the
power amplifier board.
Disengage the wire clamp bundling the wire of the
power transformer.
Disconnect the wires from connectors CN181,
CN191 and CN194 on the main board.
Remove the screw J, which retains the main board,
together with the wire holder.
Remove the two screws K, screw K' and screw L
attaching the main board.
Remove the two screws Mattaching the main
board and then remove the rear panel.
Take out the main board from the bottom chassis.
Remove the bottom panel.
Remove the top panel.
Remove the CD mechanism assembly.
Remove the front panel assembly.
Remove the tuner board.
Remove the speaker board.
Removing the power amplifier board
(See Fig. 11.)
1.
2.
Disconnect the wires from connectors CN192 and
CN193 on the power amplifier board.
Remove the two screws Nattaching the fan motor.
Remove the bottom panel.
Remove the top panel.
Remove the CD mechanism assembly.
3.
4.
Remove the two screws Pattaching the power
amplifier board.
Lift the power amplifier board, disengage the two
hooks efrom the heat sink of the main board and
take out the power amplifier board.

VS-DT6
1-9
Tie band
Fig.12
Fig.13
N
Q
Fan motor
Bottom chassis
Wire clamp
Main board
Treat the wire from the fan motor.
Power amplifier
board
Power transformer
CN191
CN194
CN192
CN181
Fan motor
Washers
[Reference]
After connecting the wires, bundling them
using a wire clamp and tie band.
[Reference]
After mounting the fan motor, treat the wire
from the fan motor as shown in fig. 12.
Removing the power transformer
(See Fig. 12.)
1.
2.
3.
4.
Disengage the wire clamp and tie band bundling
the wires of the power transformer.
Disconnect the wire from connector CN192 on the
power amplifier board.
Disconnect the wires from connectors CN191 and
CN194 on the main board.
Remove the two screws Qand two washers
attaching the power transformer.
Removing the fan motor
(See Figs. 12 and 13.)
1.
2.
Disconnect the wire from connector CN181 on the
main board.
From the right side of the main body, remove the
two screws Nattaching the fan motor.
Remove the bottom panel.
Remove the top panel.
Remove the CD mechanism assembly.
Remove the bottom panel.
Remove the top panel.
Remove the CD mechanism assembly.
Remove the front panel assembly.

VS-DT6
1-10
Fig.14
Fig.15
Fig.16
Fig.17
Fig.18
Fig.19
W
Door motor
Stop washer
Washer
Open/close
board
Gear 2
Switch board
Door motor assembly
Front panel assembly
(Back side)
Clutch assembly
X
Y
T
S
R
Front panel assembly
(Back side) Rod gear assembly
f
Front base
Moving panel assembly
g
hh
Moving base
Hole
Front board
i
Card wire
Moving panel
Door motor assembly
Front base
Y'
Wire
<Front panel assembly section>
Removing the switch board
(See Fig. 14.)
From the back side of the front panel assembly,
remove the four screws Rattaching the switch
board.
Remove the bottom panel.
Remove the top panel.
Remove the CD mechanism assembly.
Remove the front panel assembly.
Removing the front board
(See Figs. 16 to 19.)
[Reference]
Before attaching the moving base, pass the
card wire of the front board through the hole
on the moving base. (See Fig.18.)
When attaching the screw Y', attach the wire
at the same time.
1.
2.
From the back side of the front panel assembly,
remove the two screws Sattaching the door motor
assembly.
Remove the screw Tattaching the open/close
board of the door motor assembly.
Removing the open/close board
(See Figs. 14 and 15.)
1.
2.
3.
Remove the stop washers attaching the clutch
assembly and gear 2.
Remove the clutch assembly, washer and Gear 2.
Remove the two screws Wattaching the door
motor.
Removing the door motor (See Fig. 15.)
Remove the door motor assembly.
1.
2.
3.
4.
5.
6.
7.
While widening section fof the front base in the
direction of the arrow, remove the rod gear
assembly.
Slide the moving panel assembly all the way in the
direction of the arrow.
While slightly widening sections gtoward the front,
take out the moving panel assembly in the direction
of the arrow.
Remove the two screws Xattaching the moving
base of the moving panel assembly.
Disengage the engagement sections hon the
inside of the moving base and at the inside of the
moving panel assembly and remove the moving
base.
Remove the screw Yand screw Y' attaching the
front board.
Disengage the claws iof the moving panel and
remove the front board.

VS-DT6
1-11
Fig.1
Fig.2
Fig.3
LED board
Top chassis
Claw a
Engagement section d
Short land section b
CN611
CN601
Top chassis
CD mechanism assembly
CN612
Projection cB
A
A
CD servo board
Flexible wire
Protector
<CD mechanism assembly section>
Removing the LED board (See Fig. 1.)
From the top side of the CD mechanism assembly,
disengage the claw aof the top chassis attaching
the LED board and then remove the LED board.
[Caution] Be sure to solder the short land
section b on the flexible wire before
disconnecting the flexible wire from
connector CN601 on the CD servo
board.
If the flexible wire is disconnected
without attaching solder, the pickup
unit may be destroyed by static
electricity.
Removing the CD mechanism
assembly (See Fig. 2.)
From the back side of the CD mechanism
assembly, remove the three screws Aattaching the
CD mechanism assembly on the top chassis.
Raise the protector in the direction of arrow and
then remove the CD mechanism assembly.
Removing the CD servo board
(See Fig. 3.)
[Caution] In the assembly, be sure to remove
solder from the short land section b
after connecting the flexible wire.
1.
2.
3.
4.
5.
From the back side of the CD mechanism
assembly, attach solder to the short land section b
of the flexible wire that is connected to the
connector CN601 of the CD servo board.
Disconnect the flexible wire from connector CN601
on the CD servo board.
Disconnect the card wires from connectors CN611
and CN612 on the CD servo board.
Remove the two screws Battaching the CD servo
board.
Lift the front edge of the CD servo board slightly
and disengage it from the projection cand then
from the engagement section d.
1.
2.

VS-DT6
1-12
Fig.4
Fig.5
Fig.6
Claw e
Traverse mechanism
assembly
Section f
C
DD
Shaft
Pickup unit
Pickup unit
Traverse mechanism assembly
Rack plate
P.S. spring
G
F
E
E
CD servo board
bracket
Shaft
Removing the traverse mechanism
assembly (See Fig. 4.)
1.
2.
3.
Remove the CD servo board.
Remove the two screws Cattaching the CD servo
board bracket.
Remove the two screws Dattaching the traverse
mechanism assembly.
Disengage the claw eattaching the traverse
mechanism assembly and then take out the
traverse mechanism assembly.
Removing the pickup unit
(See Figs. 5 and 6.)
1.
2.
3.
4.
5.
Remove the CD servo board.
Remove the traverse mechanism assembly.
From the top side of the traverse mechanism
assembly, remove the two screws Eattaching the
shaft.
From the traverse mechanism assembly, disengage
the section fof the pickup unit and then remove the
pickup unit with the shaft.
Pull the shaft out of the pickup unit.
Remove the screw Fattaching the rack plate from
the pickup unit.
Remove the screw Gattaching the P.S. spring from
the pickup unit.

VS-DT6
1-13
Fig.7
Fig.8
Fig.9
Section f
Groove g
Groove h
Traverse mechanism assembly
Spindle motor
Feed motor
Red
Red
Black Traverse
mechanism board
H
J
H
Section j
Rack prate
E
Attaching the pickup unit
(See Figs. 7 and 8.)
1.
2.
3.
4.
Attach the P.S. spring and rack plate to the pickup
unit.
Insert the shaft into the pickup unit.
Engage the section fof the pickup unit with the
traverse mechanism assembly first, and set the
both ends of the shaft in the grooves gand h.
After making sure that the section jof the rack plate
is meshed correctly with the middle gear, attach the
shaft using the two screws E.
[Reference]
Refer to the explanation of "Removing the
pickup unit" on the preceding page.
Removing the traverse mechanism
board (See Fig. 9.)
1.
2.
Remove the CD servo board.
Remove the traverse mechanism assembly.
From the back side of the traverse mechanism
assembly, disconnect the spindle motor wires and
feed motor wires that are soldered on the traverse
mechanism board.
Remove the two screws Hattaching the traverse
mechanism board.
Removing the feed motor (See Fig. 9.)
1.
2.
Remove the CD servo board.
Remove the traverse mechanism assembly.
From the back side of the traverse mechanism
assembly, disconnect the feed motor wires that are
soldered on the traverse mechanism board.
Remove the two screws Jattaching the feed motor.

VS-DT6
1-14
Fig.10
Fig.11
Fig.12
CD mechanism assembly Clamper base assembly
Roller holder
assembly
Belt
Loading motor assembly
CN103 CN104
CD switch board
CN101
K
N
L
M
M
N
L
Removing the CD switch board
(See Fig.10.)
1.
2.
Remove the CD mechanism assembly.
From the top side of the CD mechanism assembly,
remove the screw Kattaching the CD switch board.
Lift the CD switch board slightly and then remove
the wire from connector CN101 on the CD switch
board.
Removing the loading motor assembly
(See Figs.3, 10 to 12.)
1.
2.
3.
4.
5.
6.
7.
Remove the CD mechanism assembly.
From the back side of the CD mechanism
assembly, disconnect the card wire from connector
CN612 on the CD servo board. (See Fig.3.)
From the top side of the CD mechanism assembly,
remove the two screws Lattaching the clamper
base assembly.
Disconnect the wire from connector CN101 on the
switch board while lifting the clamper base
assembly slightly and remove the clamper base
assembly.
Remove the three screws Mattaching the roller
holder assembly and take out the roller holder
assembly.
Disconnect the wires from connectors CN103 and
CN104 on the loading motor assembly.
Remove the belt of the loading motor assembly.
Remove the two screws Nattaching the loading
motor assembly and take out the loading motor
assembly.

VS-DT6
1-15
Flow of functional operation until TOC read
Slider turns REST
SW ON.
Automatic tuning
of TE offset
Laser ON
Detection of disc
Automatic measurement of
Focus S-curve amplitude
Automatic tuning of
Focus offset
Disc is rotated
Focus servo ON
(Tracking servo ON)
Automatic tuning of
Tracking error balance
Automatic measurement of
Tracking error amplitude
Automatic tuning of
Focus error balance
Disc to be
braked to stop
Tracking
servo
on states
Tracking
servo
off states
Disc states
to rotate TOC reading
finishes
Automatic measurement
of TE amplitude and
automatic tuning of
TE balance
500mv/div
2ms/div Fig.1
Approx.3sec
Pin 20 of
IC601(TEOUT)
Approx
1.8V
VREF
Tracking error waveform at TOC reading
Power ON Play Key
Confirm that the Focus error
S-curve signal at the pin 28 of
IC651 is approx.2Vp-p
Confirm that the signal from
pin 24 IC651(R808) is 0V as a
accelerated pulse during
approx.400ms.
Confirm the waveform of
the Tracking error signal
at the pin 20 of IC601 (R604)
(See Fig.1.)
Automatic tuning of
Focus error gain
Automatic tuning of
Tracking error gain
TOC reading
Play a disc
Confirm the eys-pattern
at the lead of TP1.
Confirm that the voltage at the pin3
of CN611 is "H"\"L"\"H".
Check Point

VS-DT6
1-16
SOURCE PRESET VOL
COMPACT COMPONENT SYSTEM
Error code
COMPACT COMPONENT SYSTEM
SOURCE PRESET VOL
Error code indication
Error code is indicated on the FL display.
Error code contents
SOURCE PRESET VOL
FL indication
CD INIT ERR.
CD EJECT ERR
CD MECHA ERR
CD LOAD ERR.
Mechanism initialize error
Eject error / DISC abnormal equipment
Chucking switch error
Load error
Phenomenon
SOURCE PRESET VOL
This unit is placed horizontally.
This unit is placed vertically.

VS-DT6
1-17
Turn off the power switch and, disconnect the
power cord from the ac outlet.
Replace the pickup with a normal one.(Refer
to "Removing the pickup unit" on the previous page)
Plug the power cord in, and turn the power on.
At this time, check that the laser emits for
about 3seconds and the objective lens moves
up and down.
Note: Do not observe the laser beam directly.
Play a disc.
Check the eye-pattern at TP1.
Finish.
Maintenance of laser pickup
(1) Cleaning the pick up lens
Before you replace the pick up, please try to
clean the lens with a alcohol soaked cotton
swab.
(2) Life of the laser diode
When the life of the laser diode has expired,
the following symptoms will appear.
The level of RF output (EFM output : ampli
tude of eye pattern) will below.
Is the level of
RFOUT under
1.25V 0.22Vp-p? Replace it.
NO
YES
O.K
(3) Semi-fixed resistor on the APC PC board
The semi-fixed resistor on the APC printed circuit board which is attached to the pickup is used to adjust the laser
power. Since this adjustment should be performed to match the characteristics of the whole optical block, do not
touch the semi-fixed resistor.
If the laser power is lower than the specified value, the laser diode is almost worn out, and the laser pickup should
be replaced.
If the semi-fixed resistor is adjusted while the pickup is functioning normally, the laser pickup may be damaged
due to excessive current.
Replacement of laser pickup

VS-DT6
1-18
1. Terminal layout
MN101C30AKJ1 (IC701) : System control microcomputer
1
16
48
33
64 49
17 32
2. Pin function
Description of major ICs
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
THERM
KEY1
KEY2
VERSION
GND
VREF+
VDD
OSC2
OSC1
VSS
XI
XO
GND
CDTX
CDRX
FLRST
FLDATA
FLCS
FLCLK
STBLEDH
RST
STBLEDV
FTU
TUDATA
TUST
TUCK
MPX
RDSCK
RDSI
REM
GND
SMUTE
AHB
VOLDI
VOLCE
VOLCL
LOMUTE
TREMCONT
H-V
I
I
I
I
-
-
-
O
I
-
I
O
-
O
I
O
I/O
O
O
O
I
O
O
I/O
O
O
I
-
-
I
-
O
O
O
O
O
O
I
-
I
Temperature detection, ON/OFF control of FAN_SW signal(pin 57)
Key switch input of the main body
Key switch input of the main body
Switching signal for destination
Ground
Reference voltage for A/D converter (Connect to VDD.)
Power supply for microcomputer
8MHz main clock output
8MHz main clock input
Ground for microcomputer
32.768kHz sub clock input
32.768kHz sub clock output
Ground
CD(FMU-F1) communication
CD(FMU-F1) communication
FL reset output
FL driver communication data input/output
FL driver communication chip select output
FL driver communication clock output
Standby LED for horizontal establishment (POWER_OFF/ON=H)
Microcomputer reset input
Standby LED for vertical establishment (POWER_OFF/ON=H)
Power supply for tuner
PLL input/output data (Connect to tuner.)
PLL strobe output (Connect to tuner.)
PLL clock output (Connect to tuner.)
Stereo detection (Connect to tuner.), STEREO=L
Not use
Not use
Remote controller input
Ground
Mute signal, MUTE=L
Bass boost, ON=L, POWER_OFF=L
Data output (Connect to VOLUME_IC.)
Enable output (Connect to VOLUME_IC.)
Clock output (Connect to VOLUME_IC.)
Line out mute signal, MUTE=L
Remote controller effective signal for horizontal establishment, L : effective state
Connect to ground
Detecting signal for horizontal or vertical establishment
Pin No. Symbol I/O Function

VS-DT6
1-19
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
50
60
61
62
63
64
CDRSI
BLCTL
PSAVE
FCD
POUT
TOPLED1
TOPLED2
STBDIM
DOOR1
DOOR2
+BCTL
BUP
FANSW
MT0
MT1
MTS
VREF-
LOCK
SAFETYCD
SAFETY
-
-
-
O
-
-
O
-
O
O
O
I
I
I
O
I
O
O
O
O
-
I
I
I
Connect to ground
Connect to ground
Connect to ground
CD reset output (Connect to FMU-F1.)
Connect to ground
Not connect
Power save mode ON/OFF signal, SAVE=H
CD power supply ON/OFF, not use
Main power supply ON/OFF
LED color control (Software PWN output)
LED color control (Software PWN output)
Dimmer control for STBYLED_H/V
Moving panel position detecting signal, CLOSE=L
Moving panel position detecting signal, OPEN=L
Unnecessary power supply cut-off signal for outage, Outage=H
Outage detecting signal (Backup mode)
Fan motor ON/OFF signal
Panel open (Motor driver)
Panel close (Motor driver)
Panel action speed (Not use)
Reference voltage for A/D converter (Connect to VSS.)
Detection signal for panel action load
Detecting signal for CD abnormal voltage
Detecting signal for abnormal voltage
Pin No. Symbol I/O
KIA78S06P (IC702) : Regulator
123
3
2
1
Input
Common
Output
2. Pin function
Pin No. Function
1. Terminal layout 3. Block diagram
Q14
Q1
Q16
Z1
Q2 Q7
Q4 Q6 C1
Q9
Q8
Q10
Q11
Q12
Q13
Q5
Q3
3INPUT
2OUTPUT
1COMMON
R7
R5
R6
R8
R3 R2
R1
R11 R10 R9
R4
Function
D1
GND
R13
Q10
R14
R16
R17
Q5
Q11
R15
Q15
Q4
R1
Q1
R3
Q2
OUTPUT
INPUT
R9
C1
Q3
Q7 R7
R11 R10
R12
Q14
Q12
D2
Q8 Q9
R18
Q6
R5
R4
R2
R6
R19
Q13
UPC78L05J (IC191) : Three terminal voltage regulator
1. Terminal layout
123
1 : OUTPUT
2 : GND
3 : INPUT
2. Circuit diagram

VS-DT6
1-20
1. Terminal layout
MN662790RSC (IC651) : Digital servo & Digital signal prossesor
21
40
80
61
20 1
41 60
2. Pin function
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
BCLK
LRCK
SRDATA
DVDD1
DVSS1
TX
MCLK
MDATA
MLD
SENSE
FLOCK
TLOCK
BLKCK
SQCK
SUBQ
/DMUTE
STAT
DSP_RST
SMCK
CSEL
TEST2
TVD
PC
ECM
ECS
VDETMON
TRD
FOD
VREF
FBAL
TBAL
FE
TE
RF ENV
TEST3
OFT
TRCRS
/RFDET
BDO
LDON
O
O
O
-
-
O
I
I
I
-
-
-
O
I
O
I
O
I
-
I
-
O
-
O
O
-
O
O
I
O
O
I
I
I
I
I
I
I
I
-
Bit clock output for SRDATA
LR signal separation output
Serial data output
Power supply for digital circuit
GND for digital circuit
Digital audio ineterface output
Micro computer command clock signal input
Micro computer command data input
Micro computer command load signal input (L:Load)
Not use
Not use
Not use
Sub code block signal output
External clock input for sub code Q register input
Sub code Qdata output
Muting input (H:Mute)
Status signal input
Reset signal input (L:Reset)
Not use
Connect to DVDD1 (H fix)
Not use
Traverse drive output
Not use
Spindle motor drive signal (Enforced mode output)
Spindle motor drive signal (Servo error signal output)
Not use
Tracking drive output
Focus drive output
Reference voltage for D/A output block
Focus balance adjust signal output
Tracking balance adjust signal output
Focus error signal input (Analog input)
Tracking error signal input (Analog input)
RF envelope signal input (analog input)
Connect to GND
Off track signal input (H:Off track)
Track crosssignal input
RF detect signal input (L:Detect)
Drop out signal input (H:Drop out)
Not use
Pin No. Symbol I/O Function