JVC TH-C60J User manual

SERVICE MANUAL
COPYRIGHT © 2006 Victor Company of Japan, Limited No.MB511
2006/5
DVD DIGITAL THEATER SYSTEM
MB51120065
TH-C60J,TH-C60C,TH-C50J,
TH-C50C,TH-C40J,TH-C40C
Lead free solder used in the board (material : Sn-Ag-Cu, melting point : 219 Centigrade)
TABLE OF CONTENTS
1 PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5
2 SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-9
3 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-10
4 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-34
5 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-37
XV-THC60
SP-PWC60
SP-THC60F SP-THC60F SP-THC60S
SP-THC60C
XV-THC50
SP-PWC50
SP-THC50S
SP-THC60F SP-THC60F
SP-THC60C
XV-THC40
SP-PWC40
SP-THC40S
SP-THC40F
SP-THC40C

1-2 (No.MB511)
SPECIFICATION
Center unit (XV-THC60/XV-THC50/XV-THC40)
*1Corresponding to Linear PCM, Dolby Digital, and DTS Digital Surround (with sampling frequency -32 kHz, 44.1 kHz, 48 kHz)
Subwoofer (SP-PWC60/SP-PWC50)
Audio section Digital input*1 DIGITAL IN (DBS)
(OPTICAL)
-21 dBm to -15 dBm
(660 nm ±30 nm)
Video section Video System 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 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 0.286 V(p-p)/75 Ω
HDMI HDMI Output (Ver. 1.0) MONITOR OUT
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 87.5 MHz to 108.0 MHz
AM 530 kHz to 1 710 kHz
General Power Requirements AC 120 V , 60 Hz
Power Consumption 25 W (at operation)
0.6 W (in standby mode)
Dimensions (W ×H ×D) 400 mm ×85 mm ×316 mm(15-3/4 inches ×3-3/8 inches ×12-1/2 inches)
Mass 3.8 kg (8.4 lbs)
Amplifier section Front/Center/Surround 200 W per channel, RMS at 3 Ωat 1 kHz, with 10 % total harmonic distortion.
Subwoofer 200 W, RMS at 3 Ωat 100 Hz, with 10 % total harmonic distortion.
Speaker section Speaker unit 16 cm (6-5/16 inches) Bass-reflex
Power Handling Capacity 200 W
Impedance 3 Ω
Frequency Range 30 Hz to 200 Hz
Sound Pressure Level 74 dB/W·m
General Power Requirements AC 120 V , 60 Hz
Power Consumption 180 W (at operation)
0 W (in standby mode)
Dimensions (W ×H ×D) 171 mm ×411 mm ×458 mm(6-3/4 inches ×16-3/16 inches ×18-1/16 inches)
Mass 12.3 kg (27.2 lbs)

(No.MB511)1-3
Subwoofer (SP-PWC40)
Satellite Speakers - SP-XTHC60
Amplifier section Front/Center/Surround 167 W per channel, RMS at 3 Ωat 1 kHz, with 10 % total harmonic distortion.
Subwoofer 167 W, RMS at 3 Ωat 100 Hz, with 10 % total harmonic distortion.
Speaker section Speaker unit 16 cm (6-5/16 inches) Bass-reflex
Power Handling Capacity 170 W
Impedance 3 Ω
Frequency Range 30 Hz to 200 Hz
Sound Pressure Level 73 dB/W·m
General Power Requirements AC 120 V , 60 Hz
Power Consumption 160 W (at operation)
0 W (in standby mode)
Dimensions (W ×H ×D) 170 mm ×411 mm ×458 mm(6-3/4 inches ×16-3/16 inches ×18-1/16 inches)
Mass 11.5 kg (25.4 lbs)
Front speakers
(SP-THC60F)
Type 1-way 2-speaker Bass reflex type(Magnetically shielded Type)
Speaker 5.5 cm (2-3/16 inches) cone ×2
Power Handling Capacity 200 W
Impedance 3 Ω
Frequency Range 100 Hz to 20 000 Hz
Sound Pressure Level 78 dB/W·m
Dimensions (W ×H ×D) 280 mm ×1 106 mm ×280 mm(11-1/16 inches ×43-9/16 inches ×11-1/16 inches)
Mass 3.3 kg (7.3 lbs) each
Center speaker
(SP-THC60C)
Type 1-way 2-speaker Bass reflex type
(Magnetically shielded Type)
Speaker 6.5 cm (2-9/16 inches) cone ×2
Power Handling Capacity 200 W
Impedance 3 Ω
Frequency Range 90 Hz to 20 000 Hz
Sound Pressure Level 81 dB/W·m
Dimensions (W ×H ×D) 250 mm ×85 mm ×91 mm(9-7/8 inches ×3-3/8 inches ×3-5/8 inches)
Mass 0.8 kg (1.8 lbs)
Surround speakers
(SP-THC60S)
Type 2-way 3-speaker Bass reflex type
Speaker 5.5 cm (2-3/16 inches) cone ×2
3.0 cm (1-3/16 inches) dome ×1
Power Handling Capacity 200 W
Impedance 3 Ω
Frequency Range 100 Hz to 20 000 Hz
Sound Pressure Level 78 dB/W·m
Dimensions (W ×H ×D) 280 mm ×1 114 mm ×280 mm(11-1/16 inches ×43-7/8 inches ×11-1/16 inches)
Mass 3.4 kg (7.5 lbs) each

1-4 (No.MB511)
Satellite Speakers - SP-XTHC50
Satellite Speakers - SP-XTHC40
• HDMI, the HDMI logo and High-Definition Multimedia Interface are trademarks or registered trademarks of HDMI Licensing LLC.
• HDCP is the abbreviation of "High-Bandwidth Digital Content Protection," and is the high-reliable copy control technology licensed
by Digital Content Protection, LLC.
• Designs and specifications are subject to change without notice.
Front speakers
(SP-THC60F)
Type 1-way 2-speaker Bass reflex type(Magnetically shielded Type)
Speaker 5.5 cm (2-3/16 inches) cone ×2
Power Handling Capacity 200 W
Impedance 3 Ω
Frequency Range 100 Hz to 20 000 Hz
Sound Pressure Level 78 dB/W·m
Dimensions (W ×H ×D) 280 mm ×1 106 mm ×280 mm(11-1/16 inches ×43-9/16 inches ×11-1/16 inches)
Mass 3.3 kg (7.3 lbs) each
Center speaker
(SP-THC60C)
Type 1-way 2-speaker Bass reflex type(Magnetically shielded Type)
Speaker 6.5 cm (2-9/16 inches) cone ×2
Power Handling Capacity 200 W
Impedance 3 Ω
Frequency Range 90 Hz to 20 000 Hz
Sound Pressure Level 81 dB/W·m
Dimensions (W ×H ×D) 250 mm ×85 mm ×91 mm(9-7/8 inches ×3-3/8 inches ×3-5/8 inches)
Mass 0.8 kg (1.8 lbs)
Surround speakers
(SP-THC50S)
Type 1-way Bass reflex type
Speaker 8.0 cm (3-3/16 inches) cone ×1
Power Handling Capacity 200 W
Impedance 3 Ω
Frequency Range 80 Hz to 20 000 Hz
Sound Pressure Level 70 dB/W·m
Dimensions (W ×H ×D) 111.5 mm ×148 mm ×106.5 mm(4-7/16 inches ×5-7/8 inches ×4-1/4 inches)
Mass 0.44 kg (0.98 lbs) each
Front speakers
(SP-THC40F)
Type 2-way 2-speaker Bass reflex type(Magnetically shielded Type)
Power Handling Capacity 170 W
Impedance 3 Ω
Frequency Range 80 Hz to 20 000 Hz
Sound Pressure Level 77 dB/W·m
Dimensions (W ×H ×D) 104.5 mm ×139 mm ×101 mm(4-1/8 inches ×5-1/2 inches ×4 inches)
Mass 0.56 kg (1.3 lbs) each
Center speaker
(SP-THC40C)
Type 2-way 2-speaker Bass reflex type(Magnetically shielded Type)
Speaker 8.0 cm (3-3/16 inches) cone ×1
1.5 cm (5/8 inches) dome ×1
Power Handling Capacity 170 W
Impedance 3 Ω
Frequency Range 80 Hz to 20 000 Hz
Sound Pressure Level 77 dB/W·m
Dimensions (W ×H ×D) 137 mm ×105 mm ×104.5 mm(5-7/16 inches ×4-3/16 inches ×4-1/8 inches)
Mass 0.57 kg (1.3 lbs)
Surround speakers
(SP-THC40S)
Type 1-way Bass reflex type
Speaker 8.0 cm (3-3/16 inches) cone ×1
Power Handling Capacity 170 W
Impedance 3 Ω
Frequency Range 80 Hz to 20 000 Hz
Sound Pressure Level 70 dB/W·m
Dimensions (W ×H ×D) 111.5 mm ×148 mm ×106.5 mm(4-7/16 inches ×5-7/8 inches ×4-1/4 inches)
Mass 0.56 kg (1.3 lbs) each

(No.MB511)1-5
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

1-6 (No.MB511)
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

(No.MB511)1-7
1.8 Importance administering point on the safety
Graphic symbol mark
(This symbol means fast blow type fuse.)
FOR CONTINUED PROTECTION AGAINST RISK
OF FIRE, REPLACE ONLY WITH SAME TYPE
AND RATING OF FUSES ;
should be read as follows ;
F101 : 8A 125V
F153 : 10A 125V
F154 : 10A 125V
F101 : 8A 125V
F153 : 10A 125V
F154 : 10A 125V
Full Fuse Replacement Marking
FUSE CAUTION
Le symbole graphique (Ce symbole signifie
fusible de type a fusion rapide.)
POUR UNE PROTECTION CONTINUE CONTRE
DES RISQUES D'INCENDIE, REMPLACER
SEULEMENT PAR UN FUSIBLE DU MEME TYPE ;
Marquage Pour Le Remplacement
Complet De Fusible
PRECAUTIONS SUR LES FUSIBLES
doit etre interprete comme suit ;
^
CN274
B5504
B5218
B5604
B5220
FC157
D151
D153
B5605
D514
B5221
FC158
B5303
FC156
C164
B5224 B5223
B5304
B5222
B5606
B5802
B5305
B5106
C523
C512
D152
FC155
D154
C163
B5302
B5040
D550 D549
B5202
B5001
B5112
B5901
D541
B5003
B5502
C3715
R3727
R3720
B5035
C3720
B5036
D3706
B5219
C3716
D3708
Q3704
D3707
B5406
B5022
B2214
B5024
C3502
B5025
C161
C162
D3502
B2215
L2102
R2115
B5043
D3501
C3503
D510
B5041
D551
C3602
C3604
D3602
D3601
B2023
CN372
C101
FC102
D101
FC101
RY101
D516
D535
CN502
R3719
D3703
C3721
R685
R555
CN151
CN371
CN101
FW501
S901
CN102
FC103 FC104
B5301
B5201
HS151
B5225
B5803
B5306 B5004
D901
L901
D902
D903
PC901
D951
D952
Q951
CP951
L957
D992
B4701
P901
FC901
FC902
T901
B4301
C911
C908
C904
C992
C916
C912
C961
C907
C905
C909
C903
C982
C914
C960
C952
C913
R921
R951
R901
B4302
B4101
B4202
W914
C902
R922
B4146
EP901
TH901
D904
R903
D956
D4811
B4703
B4204
B4303
B4501
C4707
B4305
B4103
R4811
B4306
B4852
D4705
R4708
B4802
J4402
C4451
C4441
C4431
B4902
B4108
B4207
B4113
B4403
B4310
B4114
B4201
HS901
IC901
B4605
B4507
B4407
B4133
B4210
B4135
B4211 B4320
B4212 B4321
B4138
B4139 B4140
B4141
B4214
B4217
B4149
B4218
R973
Q982
B4150
B4151
R982
Q983
W921
C983
D981
D993
Main body
Main board
Subwoofer
Mother board

1-8 (No.MB511)
1.9 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.
WARNING LABEL and PRINT

(No.MB511)1-9
SECTION 2
SPECIFIC SERVICE INSTRUCTIONS
This service manual does not describe SPECIFIC SERVICE INSTRUCTIONS.

1-10 (No.MB511)
SECTION 3
DISASSEMBLY
3.1 Main body
3.1.1 Removing the metal cover
(See Fig.1 and 2)
(1) Remove the three screws Aattaching the metal cover.
(See Fig.1)
(2) Remove the four screws Battaching the metal cove. (See
Fig.2)
Fig.1
Fig.2
A
B

(No.MB511)1-11
3.1.2 Removing the front panel assembly
(See Fig.3 to 5)
(1) Disconnect the card wires from connector CN450, CN451
and CN457 of the main board. (See Fig.3)
(2) Remove the one screw Cattaching the earth wire to the
main board. (See Fig.3)
(3) From the bottom side of main body, remove the two screws
Dattaching the front panel assembly. (See Fig.4)
(4) Disengage the hook a of the bottom side and hook b of the
both side of front panel assembly, and then remove the
front panel assembly. (See Fig.4 and 5)
Fig.3
Fig.4
Fig.5
C
CN450 CN451
CN457
DaD
b

1-12 (No.MB511)
3.1.3 Removing the DVD changer mechanism assembly
(See Fig.6 to 8)
(1) From the back side of main body, remove the one screw E
and one screw Fattaching the DVD changer mechanism
assembly. (See Fig.6)
(2) Disconnect the connector wire from connector CN704 of
the DVD module board. (See Fig.7)
(3) Disconnect the card wires from connector CN701, CN702,
CN703 and CN801 of the DVD module board. (See Fig.7)
(4) Remove the four screws Gattaching the DVD changer
mechanism assembly. (See Fig.8)
Fig.6
Fig.7
Fig.8
EH
M
LJF
CN701
CN702
CN703 CN801
CN704
GG

(No.MB511)1-13
3.1.4 Removing the audio & digital input board
(See Fig.6 and 9)
(1) Disconnect the card wire from connector CN102 of the au-
dio & digital input board. (See Fig.9)
(2) Disconnect the connector CN101 connecting the connec-
tion board. (See Fig.9)
(3) From the back side of main body, remove the one screw H
and one screw Jattaching the audio & digital input board.
(See Fig.6)
(4) Move the audio & digital input board to front ward until dis-
engage position from the bracket board, and then take out
to up ward. (See Fig.9)
3.1.5 Removing the USB jack board
(See Fig.9)
(1) Remove the one screw Kattaching the USB jack board.
(See Fig.9)
3.1.6 Removing the tuner pack
(See Fig.6 and 10)
(1) Disconnect the card wire from connector CN410 of the
main board. (See Fig.10)
(2) Remove the two screws Lattaching the tuner pack. (See
Fig.6)
3.1.7 Removing the main board
(See Fig.6 and 11)
(1) Disconnect the card wires from connector CN401, CN402,
CN403 and CN404 of the main board. (See Fig.11)
Reference:
This step is unnecessary if the DVD changer mechanism
assembly is removed previously.
(2) From back side of main body, remove the five screws Mat-
taching the main board. (See Fig.6)
(3) Remove the three screws Nattaching the main board. (See
Fig.11)
Fig.9
Fig.10
Fig.11
CN101
CN102 Audio & Digital input
board
Bracket board
USB jack board
K
Tuner pack
CN410
N
N
N
CN401 CN402
CN403CN404

1-14 (No.MB511)
3.1.8 Removing the operation board
(see Fig.12)
(1) Remove the one screw Pattaching the bracket board.
(2) Remove the three screws Qattaching the operation board.
3.1.9 Removing the front board
(See Fig.12 and 13)
(1) Take out the volume knob.
(2) Remove the one screw Rattaching the volume. (See
Fig.13)
(3) Remove the bracket board and operation board. (See
Fig.12)
(4) Remove the seven screws Sattaching the front board.
(See Fig.12)
Fig.12
Fig.13
Bracket boardOperation board
Front board
QS
SSSSS
SQQ
P
R

(No.MB511)1-15
3.2 Subwoofer
3.2.1 Removing the amp unit
(See Fig.1 to 3)
(1) From the bottom side of subwoofer assembly, remove the
eight screws Aattaching the amp unit. (See Fig.1)
(2) From the back side of subwoofer assembly, remove the
two screws Battaching the amp unit. (See Fig.2)
(3) Pull out the amp unit, and then disconnect the connector
wire from connector CN274 of the mother board. (See
Fig.3)
Fig.1
Fig.2
Fig.3
A
A
BB
CN274
Mother board

1-16 (No.MB511)
3.2.2 Removing the rear plate
(See Fig.4 and 5)
(1) Disconnect the connector wire from connector CN371 of
the mother board. (See Fig.4)
(2) Remove the six screws Cand one screw Dattaching the
rear plate (See Fig.5)
Fig.4
Fig.5
CN371
C
CC
D

(No.MB511)1-17
3.2.3 Removing the power transformer
(See Fig.6 and 7)
(1) Remove the four screws Eattaching the power transform-
er. (See Fig.6)
(2) Disconnect the connector wire from connector CN151 of
the mother board. (See Fig.7)
Fig.6
Fig.7
E
E
CN151

1-18 (No.MB511)
3.2.4 Removing the mother board
(See Fig.8 to 11)
(1) Remove the two screws Fattaching the LED board. (See
Fig.8)
(2) Remove the two screws Gattaching the heat sink bracket.
(See Fig.9)
(3) Remove the two screws Hattaching the mother board.
(See Fig.9)
(4) Release the lock of connectors CN372, CN501 and CN502
connect the amp board and mother board, and then re-
move the mother board. (See Fig10 and 11)
Fig.8
Fig.9
Fig.10
Fig.11
FF
G
HH
G
Heat sink bracket
CN372 CN501 Mother board
Amp board
CN502
Amp board
Mother board

(No.MB511)1-19
3.2.5 Removing the amp board
(See Fig.12 and 13)
(1) Remove the two screws Jattaching the heat sink bracket.
(See Fig.12)
(2) Remove the three screws Kattaching the heat sink. (See
Fig.12)
(3) Remove the three screws Lattaching the heat sink. (See
Fig.13)
(4) Remove the three screws Mattaching the amp board. (See
Fig.13)
Fig.12
Fig.13
Heat sink
Heat sink bracket
K
J
Amp board
Heat sink
MM
LL

1-20 (No.MB511)
3.2.6 Removing the heat sink
(See Fig.14 and 15)
(1) Remove the four screws Nattaching the power ICs. (See
Fig.14)
(2) Remove the three screws Pattaching the hear sink. (See
Fig.15)
Fig.14
Fig.15
N
Power IC Heat sink
PP
P