JVC TH-C90A User manual

SERVICE MANUAL
COPYRIGHT © 2006 Victor Company of Japan, Limited No.MB570
2006/9
DVD DIGITAL CINEMA SYSTEM
MB57020069
TH-C90A,TH-C90US,TH-C90UX,
TH-C90UG,TH-C60US,TH-C60UP,
TH-C60UW,TH-C60UX,TH-C60UY,
TH-C60UG
Lead free solder used in the board (material : Sn-Ag-Cu, melting point : 219 Centigrade)
TABLE OF CONTENTS
1 PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
2 SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7
3 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8
4 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-39
5 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-43
XV-THC90
SP-PWC90
SP-THC90F SP-THC90F
SP-THC90C
SP-THC90S SP-THC90S
XV-THC60
SP-PWC60
SP-THC60F SP-THC60F
SP-THC60C
SP-THC60S

1-2 (No.MB570)
SPECIFICATION
Center unit (XV-THC90/XV-THC60)
*1: Corresponding to Linear PCM, Dolby Digital, and DTS Digital Surround (with sampling frequency -32 kHz, 44.1 kHz, 48 kHz)
*2: For the countries of the Middle East
Subwoofer (SP-PWC90)
Subwoofer (SP-PWC60)
Audio section Digital input*1 DIGITAL IN (DBS) (OPTICAL) -21 dBm to -15 dBm (660 nm ±30 nm)
Analog input AUX IN (VCR)
TAPE IN (Only for XV-THC90)
Analog output TAPE OUT (Only for XV-THC90)
Video section Video System PAL/NTSC
Horizontal Resolution 500 lines
Signal-to-Noise Ratio 64 dB
Video output level Composite 1.0 V(p-p)/75 Ω
S-video-Y 1.0 V(p-p)/75 Ω
S-video-C For PAL: 0.3 V(p-p)/75 Ω
For NTSC: 0.286 V(p-p)/75 Ω
Component-Y 1.0 V(p-p)/75 Ω
Component-PB/PR 0.7 V(p-p)/75 Ω
Video input sensitivity/
Impedance (VCR IN)
Composite 1.0 V(p-p)/75 Ω
S-video-Y 1.0 V(p-p)/75 Ω
S-video-C For PAL: 0.3 V(p-p)/75 Ω
For NTSC: 0.286 V(p-p)/75 Ω
USB storage USB specification Compatible with the USB 2.0 Full-Speed
Compatible device Mass Storage Class
Compatible file system FAT16, FAT32
Bus power supply Max. 500 mA
Tuner section Tuning Range FM 87.50 MHz to 108.00 MHz
AM At 10 kHz intervals : 530 kHz to 1 710 kHz (1 600 kHz)*2
At 9 kHz intervals : 531 kHz to 1 710 kHz (1 602 kHz)*2
General Power Requirements AC 110 - 240 V , 50/60 Hz (For US, UG, UX)
AC 240 V , 50 Hz (For A)
AC 110-240 V , 50/60 Hz (For UW)
Power Consumption 25 W (at operation), 1.2 W (in standby mode)
Dimensions (W ×H ×D) 400 mm ×85 mm ×316 mm
Mass 3.8 kg
Amplifier section Front/Center/Surround 140 W per channel, RMS at 4 Ωat 1 kHz, with 10 % total harmonic distortion.
Subwoofer 300 W, RMS at 4 Ωat 40 Hz, with 10 % total harmonic distortion.
Speaker section Speaker unit 25 cm Bass-reflex
Power Handling Capacity 300 W
Impedance 4 Ω
Frequency Range 25 Hz to 200 Hz
Sound Pressure Level 74 dB/W·m
General Power Requirements AC 110 V/ AC 127 V/ AC 220 - 240 V , 50/60 Hz
Power Consumption 110 W (at operation), 0 W (in standby mode)
Dimensions (W ×H ×D) 264 mm ×481 mm ×459 mm
Mass 17.6 kg
Amplifier section Front/Center/Surround 135 W per channel, RMS at 4 Ωat 1 kHz, with 10 % total harmonic distortion.
Subwoofer 135 W, RMS at 4 Ωat 100 Hz, with 10 % total harmonic distortion.
Speaker section Speaker unit 16 cm Bass-reflex
Power Handling Capacity 140 W
Impedance 4 Ω
Frequency Range 30 Hz to 200 Hz
Sound Pressure Level 75 dB/W·m
General Power Requirements AC 110 V/ AC 127 V/ AC 220 - 240 V , 50/60 Hz
Power Consumption 135 W (at operation), 0 W (in standby mode)
Dimensions (W ×H ×D) 171 mm ×411 mm ×458 mm
Mass 12.3 kg

(No.MB570)1-3
Satellite Speakers (SP-XTHC90)
Satellite Speakers (SP-XTHC60)
Designs & specifications are subject to change without notice.
Front speakers (SP-THC90F) Type 2-way 3-speaker Bass reflex type (Magnetically shielded Type)
Speaker 13.5 cm cone ×2, 6.0 cm cone ×1
Power Handling Capacity 140 W
Impedance 4 Ω
Frequency Range 60 Hz to 20 000 Hz
Sound Pressure Level 89 dB/W·m
Dimensions (W ×H ×D) 270 mm ×1 027.5 mm ×320 mm
Mass 8.8 kg each
Center speaker (SP-THC90C) Type 2-way 3-speaker Bass reflex type (Magnetically shielded Type)
Speaker 10.5 cm cone ×2, 4.0 cm cone ×1
Power Handling Capacity 140 W
Impedance 4 Ω
Frequency Range 65 Hz to 20 000 Hz
Sound Pressure Level 89 dB/W·m
Dimensions (W ×H ×D) 400 mm ×141 mm ×171.5 mm
Mass 3.8 kg
Surround speakers (SP-THC90S) Type 2-way Bass reflex type
Speaker 10.5 cm cone ×1, 4.0 cm cone ×1
Power Handling Capacity 140 W
Impedance 4 Ω
Frequency Range 75 Hz to 20 000 Hz
Sound Pressure Level 81 dB/W·m
Dimensions (W ×H ×D) 140 mm ×228.5 mm ×174 mm
Mass 1.7 kg each
Front speakers (SP-THC60F) Type 1-way 2-speaker Bass reflex type (Magnetically shielded Type)
Speaker 5.5 cm cone ×2
Power Handling Capacity 140 W
Impedance 4 Ω
Frequency Range 100 Hz to 20 000 Hz
Sound Pressure Level 79 dB/W·m
Dimensions (W ×H ×D) 280 mm ×1 106 mm ×280 mm
Mass 3.3 kg each
Center speaker (SP-THC60C) Type 1-way 2-speaker Bass reflex type (Magnetically shielded Type)
Speaker 6.5 cm cone ×2
Power Handling Capacity 140 W
Impedance 4 Ω
Frequency Range 90 Hz to 20 000 Hz
Sound Pressure Level 82 dB/W·m
Dimensions (W ×H ×D) 250 mm ×85 mm ×91 mm
Mass 0.8 kg
Surround speakers (SP-THC60S) Type 2-way 3-speaker Bass reflex type
Speaker 5.5 cm cone ×2, 3.0 cm dome ×1
Power Handling Capacity 140 W
Impedance 4 Ω
Frequency Range 100 Hz to 20 000 Hz
Sound Pressure Level 79 dB/W·m
Dimensions (W ×H ×D) 280 mm ×1 114 mm ×280 mm
Mass 3.4 kg each

1-4 (No.MB570)
SECTION 1
PRECAUTION
1.1 Safety Precautions
(1) This design of this product contains special hardware and
many circuits and components specially for safety purpos-
es. 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 per-
formed 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 manufacturers 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 characteris-
tics are often not evident from visual inspection nor can the
protection afforded by them necessarily be obtained by us-
ing replacement components rated for higher voltage, watt-
age, etc. Replacement parts which have these special
safety characteristics are identified in the Parts List of Ser-
vice 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 charac-
teristics 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 reassem-
bling.
(5) Leakage shock hazard testing
After reassembling the product, always perform an isola-
tion check on the exposed metal parts of the product (an-
tenna 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, particular-
ly any exposed metal part having a return path to the
chassis, to a known good earth ground. Any leakage cur-
rent 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, 1,000Ωper volt or more sensitivity
in the following manner. Connect a 1,500Ω10W resistor
paralleled by a 0.15µF AC-type capacitor between an ex-
posed 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 measure 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.).
1.2 Warning
(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.
1.3 Caution
Burrs formed during molding may be left over on some parts
of the chassis.
Therefore, pay attention to such burrs in the case of pre-
forming repair of this system.
1.4 Critical parts for safety
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. When replacing them, be sure to use the parts of the
same type and rating as specified by the manufacturer.
(This regulation dose not Except the J and C version)
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

(No.MB570)1-5
1.5 Preventing static electricity
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.
1.5.1 Grounding to prevent damage by static electricity
Static electricity in the work area can destroy the optical pickup (laser diode) in devices such as laser products.
Be careful to use proper grounding in the area where repairs are being performed.
(1) Ground the workbench
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) Ground yourself
Use an anti-static wrist strap to release any static electricity built up in your body.
(3) Handling the optical pickup
• 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.
1.6 Handling the traverse unit (optical pickup)
(1) Do not subject the traverse unit (optical pickup) to strong shocks, as it is a sensitive, complex unit.
(2) Cut off the shorted part of the flexible cable using nippers, etc. 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.
(3) Handle the flexible cable carefully as it may break when subjected to strong force.
(4) I t is not possible to adjust the semi-fixed resistor that adjusts the laser power. Do not turn it.
1.7 Attention when traverse unit is decomposed
*Please refer to "Disassembly method" in the text for the pickup unit.
• Apply solder to the short land sections before the card wire is disconnected from the connecto on the servo board. (If the card wire
is disconnected without applying solder, the pickup may be destroyed by static electricity.)
• In the assembly, be sure to remove solder from the short land sections after connecting the card wire.
1M
Conductive material
(conductive sheet) or iron palate
(caption)
Anti-static wrist strap
Double
Soldering point
Motor
face tape
Card wire

1-6 (No.MB570)
1.8 Important for laser products
1.CLASS 1 LASER PRODUCT
2.CAUTION :
(For U.S.A.) Visible and/or invisible class II laser radiation
when open. Do not stare into beam.
(Others) Visible and/or invisible class 1M laser radiation
when open. Do not view directly with optical instruments.
3.CAUTION : Visible and/or invisible laser radiation when
open and inter lock failed or defeated. Avoid direct
exposure to beam.
4.CAUTION : This laser product uses visible and/or invisible
laser radiation and is equipped with safety switches which
prevent emission of radiation when the drawer is open and
the safety interlocks have failed or are defeated. 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 here in may result in
hazardous radiation exposure.
REPRODUCTION AND POSITION OF LABELS and PRINT
!Please use enough caution not to
see the beam directly or touch it
in case of an adjustment or operation
check.
CLASS 1
LASER PRODUCT
WARNING LABEL and PRINT
CLASS 1
LASER PRODUCT

(No.MB570)1-7
SECTION 2
SPECIFIC SERVICE INSTRUCTIONS
2.1 Extension cable for subwoofer
Please use the extension cable described to Service Bulletin (No. MB-SB-00018-2) when you service.
It is an extension cable for the subwoofer.
Parts No. Parts name Amount used
EXTPWC5-14P Extension cable 2
EXTPWM505-09P Extension cable 1
Amp. board
Mother board

1-8 (No.MB570)
SECTION 3
DISASSEMBLY
3.1 Main body
3.1.1 Removing the Metal cover
(See Fig. 1, 2)
(1) Remove the three screws Aattaching the Metal cove from
back side. (See fig. 1)
(2) Remove the four screws Battaching the Metal cover from
both side. (See Fig. 2)
Fig.1
Fig.2
A
B
B

(No.MB570)1-9
3.1.2 Removing the Front panel assembly
(See Fig. 3 to 5)
(1) Disconnect the card wires from Front panel assembly con-
nected to connectors CN450, CN457, CN455 and CN451
of the main board assembly. (See Fig. 3)
(2) Remove the one screw Cattaching the earth wire to Main
board assembly. (See Fig. 3)
(3) Remove the two screws Dattaching the Front panel as-
sembly from bottom side. (See Fig. 4)
(4) Disengage the hook afrom the bottom chassis. (See Fig.
4)
(5) Disengage the hook band cfrom the both side of the bot-
tom chassis. (See Fig. 5)
Fig.3
Fig.4
Fig.5
CN450
CN457
CN455
CN451
C
D
a
bc

1-10 (No.MB570)
3.1.3 Removing the Audio & Digital input board assembly
(See Fig. 6 to 8)
(1) Disconnect the card wire from Main board connected to
connector CN102 of the Audio & Digital input board assem-
bly. (See Fig. 6)
(2) For TH-C90, remove the one screw Eand two screws Fat-
taching the Audio & Digital input board assembly. (See Fig.
7)
(3) For TH-C60, remove the one screw Gand one screw Hat-
taching the Audio & Digital input board assembly. (See Fig.
8)
(4) Disconnect the board to board connector CN101 connect-
ed to connection board and then pull and lift up to direction
of the arrow then take out the Audio & Digital input board
assembly. (See Fig. 6)
Fig.6
Fig.7
Fig.8
Audio&Digital input board
CN102
CN101
E
F
G
H

(No.MB570)1-11
3.1.4 Removing the Tuner pack
(See Fig. 9, 10)
(1) Disconnect the card wire from Tuner pack connected to
connector CN410 of the Main board assembly. (See Fig. 9)
(2) Remove the two screws Jattaching the Tuner pack. (See
Fig. 10)
Fig.9
Fig.10
CN410
Tuner
J

1-12 (No.MB570)
3.1.5 Removing the Main board assembly
(See Fig. 11, 12)
(1) Disconnect the card wires from DVD servo board assembly
connected to connector CN402, CN403 and CN404 of the
Main board assembly. (See Fig. 11)
(2) Remove the four screws Kattaching the Main board as-
sembly. (See Fig. 11)
(3) Remove the four screws Lattaching the Main board as-
sembly from back side. (See Fig. 12)
Fig.11
Fig.12
Main board
CN404
CN402
CN403
K
K
K
L

(No.MB570)1-13
3.1.6 Removing the USB jack board assembly
(See Fig. 13)
(1) Disconnect the connector wire from USB jack board as-
sembly connected to connector CN811 of the DVD servo
board assembly.
(2) Remove the one screw Mattaching the USB jack board as-
sembly.
Fig.13
3.1.7 Removing the DVD changer mechanism assembly
(See Fig. 14)
(1) Remove the four screws Nattaching the DVD changer
mechanism assembly.
Fig.14
USB jack board
CN811
M
N
N

1-14 (No.MB570)
3.1.8 Removing the Operation board assembly
(See Fig. 15)
(1) Remove the one screw Pattaching the bracket board.
(2) Remove the four screws Qattaching the Operation board.
3.1.9 Removing the Front board assembly
(See Fig. 15, 16)
(1) Remove the bracket board.
(2) Remove the Operation board assembly.
(3) Remove the volume knob.
(4) Remove the one screw Rattaching the Front board assem-
bly. (See Fig.16)
(5) Remove the eight screws Sattaching the Front board as-
sembly.
3.1.10 Removing the Mic jack board assembly
(See Fig. 15)
(1) Remove the mic volume knob.
(2) Remove the two screws Tattaching the Mic jack assembly.
Fig.15
Fig.16
P
QQ
S
S
S
S
S
TFront board
Operation board
R

(No.MB570)1-15
3.2 DVD mechanism section
3.2.1 Removing the DVD module board
(See Fig.1)
(1) Disconnect the card wire connected to CN451, CN452,
CN453, CN101 and CN102 of DVD module board. (See
Fig.1)
(2) Remove the two screws Aattaching the DVD module
board. (See Fig.1)
Fig.1
3.2.2 Removing the PWB bracket and wire holder
(See Fig.2)
(1) Remove the two screws Battaching the wire holder.
(2) Remove the one screw Cattaching the PWB bracket.
Fig.2
AA
CN101CN452
CN201CN453
CN451
CPWB BKTWire holder
B

1-16 (No.MB570)
3.2.3 Removing the tray assembly
(See Fig.3 to 7)
(1) Remove the two screws Dfrom the top cover and release
the two joints aon both sides of the body. (See Fig.3)
(2) Remove the top cover with the two rods attached to the top
cover and lifter assembly respectively. (See Fig.4)
(3) Remove the open detect lever on the left side of the body.
(See Fig.5)
(4) Push part bof the slide (R) assembly on the right side of
the body to unlock the tray assembly. Draw out the trays to-
ward the front. (See Fig.6)
Attention:
The tray can be locked if all tray assemblies are at-
tached.
(5) From top of the body, move the stopper tab cin the direc-
tion of the arrow and release. Pull out the tray assemblies
from the body. (See Fig.6 and 7)
Caution:
Remove the tray assembly from top tray 5 in order.
Attention:
When reattaching the sub tray of the tray assembly, or when
removing the DVD mechanism inside, refer to another section.
Fig.3
Fig.4
Fig.5
Fig.6
Fig.7
Top cover
Lifter assembly
Rod
D
a
a
D
a
Rod Top cover
Lifter assembly
a
Open detect leve
r
b
Tray assembly
(Tray 5)
c

(No.MB570)1-17
3.2.4 Removing the motor board
(See Fig.8)
(1) Remove the two screws Dattaching the motor board.
(2) Remove the spacer fixing the motor board and tray switch-
board, and disconnect the connector CN2 on the motor
board.
(3) Disconnect the card wire from connector CN1 on the motor
board.
Caution:
When reconnection the card wire, let the card wire through the
slot dof the motor board and attach it to bottom of the body us-
ing a double face tape.
Fig.8
3.2.5 Removing the DVD tramecha assembly
(See Fig.9)
(1) Remove the three screws Eattaching the DVD tramecha
assembly.
Fig.9
Double
DD
d
CN1
CN2
Soldering point
Motor
face tape
Card wire
DVD Tramecha assembly
E
E
E

1-18 (No.MB570)
3.2.6 Removing the pickup
(See Fig.10 and 11)
(1) Remove the one screw Fand Gattaching the spring hold-
er. (See Fig.10)
(2) Lift up the shaft from the tramecha assembly. (See Fig.10)
(3) Remove the two screws Hattaching the lack. (See Fig.11)
Fig.10
Fig.11
Pickup assembly
Mecha base
e
F
G
Shaft
Spring holder
Shaft
Spring
holder
H

(No.MB570)1-19
3.2.7 Removing the side (L)
(See Fig.12 to 14)
(1) Remove the two screws Jattaching the side (L). (See
Fig.12)
(2) From the side of body, remove the spacer fixing the tray
switch board and motor board. Disconnect connector CN3
on the tray switch board and detach the side (L) upward.
(See Fig.13)
(3) Remove the one screw Kattaching the tray switch board.
(See Fig.14)
(4) Push the joint tab dof the side (L) in the direction of the ar-
row and remove the tray switch board outward, then re-
lease joint f. (See Fig.14)
Fig.12
Fig.13
Fig.14
Side (L)
J
J
Space
r
CN3
Side (L)
JJ
e
f
K
Side (L)
Tray switch board

1-20 (No.MB570)
3.2.8 Removing the side (R) assembly
(See Fig.15 to 19)
(1) Remove the three screws Lattaching the side (R) assem-
bly. (See Fig.15)
(2) Remove the spring attached to part gof the hook on the
right side of the body. (See Fig.16)
(3) Push and release the two tabs hof the gear cover through
the notches inside the side (R) assembly. Remove the gear
cover outward. (See Fig.17)
(4) From top of the body, turn the 1 gear clockwise to move the
elevator cam rearward. Move the two slots kand joint mof
the elevator cam as shown Fig.18 and remove the elevator
cam outward.
(5) Remove the three screws Mand detach the side (R) up-
ward. (See Fig.19)
Caution:
When reattaching the side (R) assembly, make sure to fit the
shaft into the slot of the select lever.
Fig.15
M
Side (R)
assembly
M
Mh