JVC RX-D302B - AV Receiver User manual

SERVICE MANUAL
COPYRIGHT © 2005 Victor Company of Japan, Limited No.MB383
2005/6
AUDIO / VIDEO CONTROL RECEIVER
MB38320056
RX-D302B,RX-D301S
Lead free solder used in the board (material : Sn-Ag-Cu, melting point : 219 Centigrade)
TABLE OF CONTENTS
1 PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
2 SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
3 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7
4 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-19
5 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-19
Area suffix
RX-D301S
J ---------------------------- U.S.A.
Area suffix
RX-D302B
J ---------------------------- U.S.A.
C ------------------------- Canada

1-2 (No.MB383)
SPECIFICATION
*1: Corresponding to Linear PCM, Dolby Digital, and DTS (with sampling frequency -32 kHz, 44.1 kHz, 48 kHz).
The USB wireless transmitter supplied with this receiver supports Direct Sequence Spreading Spectrum (DSSS) using 2.4 GHz frequency band.
USB WIRELESS SYSTEM
Designs and specifications are subject to change without notice.
Output Power At stereo operation Front channels 110 W per channel, min. RMS, driven into 6 Ωat
40 Hz to 20 kHz with no more than 0.8% total har-
monic distortion.
At surround operation Front channels 110 W per channel, min. RMS, driven into 6 Ωat
1 kHz with no more than 0.8% total harmonic dis-
tortion.
Center channel 110 W, min. RMS, driven into 6 Ωat 1 kHz, with
no more than 0.8% total harmonic distortion.
Surround channels 110 W per channel, min. RMS, driven into 6 Ωat
1 kHz, with no more than 0.8% total harmonic dis-
tortion.
Surround back channels 110 W per channel, min. RMS, driven into 6 Ωat
1 kHz, with no more than 0.8% total harmonic dis-
tortion.
Audio Audio Input Sensitivity/Impedance DVR/DVD (DVD MULTI), VCR, DBS, TV 270 mV/47 kΩ
Audio Input (DIGITAL IN)*1 Coaxial: DIGITAL IN 1(DVR/DVD) 0.5 V(p-p)/75 Ω
Optical: DIGITAL IN 2(DBS), 3(VCR): -21 dBm to -15 dBm
(660 nm ±30 nm)
USB: USB WIRELESS
USB TERMINAL
Audio Output Level DVR, VCR 270 mV
Signal-to-Noise Ratio ('66 IHF/'78 IHF) 80 dB/62 dB
Frequency Response (6 Ω)
Bass Boost
20 Hz to 20 kHz (±1 dB)
+4 dB ±1 dB at 100 Hz
Equalization (at DSP operation) Center frequency 63 Hz, 250 Hz, 1 kHz, 4 kHz, 16 kHz
Control range ±8 dB
Video Video Input Sensitivity/Impedance Composite video: DVR/DVD, VCR, DBS 1 V(p-p)/75 Ω
S-video: DVR/DVD, VCR, DBS Y (luminance): 1 V(p-p)/75 Ω
C (chrominance, burst): 0.286 V(p-p)/75 Ω
Component: DVR/DVD, VCR (DBS) Y (luminance): 1 V(p-p)/75 Ω
PB, PR: 0.7 V(p-p)/75 Ω
Video Output Level/Impedance Composite video: DVR, VCR, MONITOR OUT 1 V(p-p)/75 Ω
S-video: DVR, VCR, MONITOR OUT Y (luminance): 1 V(p-p)/75 Ω
C (chrominance, burst): 0.286 V(p-p)/75 Ω
Component: MONITOR OUT Y (luminance): 1 V(p-p)/75 Ω
PB, PR: 0.7 V(p-p)/75 Ω
Synchronization: Negative
FM tuner (IHF) Tuning Range 87.5 MHz to 108.0 MHz
Usable Sensitivity Monaural 12.8 dBf (1.2 µV/75 Ω)
50 dB Quieting Sensitivity Monaural 16.0 dBf (1.7 µV/75 Ω)
Stereo 37.5 dBf (20.5 µV/75 Ω)
Stereo Separation at REC OUT 35 dB at 1 kHz
AM tuner Tuning Range 530 kHz to 1 710 kHz
General Power Requirements AC 120 V , 60 Hz
Power Consumption 150 W/200 VA (at operation)
0.9 W (in standby mode)
Dimensions (W ×H ×D) 435 mm ×91.5 mm ×371 mm
(17 3/16 inches ×3 5/8 inches ×14 5/8 inches)
Mass 6.8 kg (15.0 lbs)

(No.MB383)1-3
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

1-4 (No.MB383)
1.5 Importance administering point on the safety
Caution: For continued protection against risk of
fire, replace only with same type 2 A/125 V for
F101, 2 A/125 V for F102, 6.3 A/125 V for F103.
This symbol specifies type of fast operating fuse.
Precaution: Pour eviter risques de feux, remplacez
le fusible de surete de F101 comme le meme type
que 2 A/125 V, 2 A/125 V pour F102, et 6,3 A/125V
pour F103.
Ce sont des fusibles suretes qui functionnes rapide.
^
Primary board (Forward side)
F103
Main amplifier board (Forward side)
F102
F101

(No.MB383)1-5
1.6 Caution after repairs
There are two power supply as the second power supply of the transformer.
One is a power supply for power IC(3pin), and another is a power supply for the control(5pin).
There are two power supply as the second power supply of the transformer.
One is a power supply for power IC(3pin), and another is a power supply for the control(8pin).
Please connect first of all and confirm the power supply for the control when you do the energizing examination after it completes of
the repair.
Please never do the energizing examination in a power supply of power IC alone.
Moreover, when the control system breaks down, power IC is occasionally damaged.
+B for power IC
(3pins)
+B for control section
(8pins)
For power IC(3pins)

1-6 (No.MB383)
SECTION 2
SPECIFIC SERVICE INSTRUCTIONS
This service manual does not describe SPECIFIC SERVICE INSTRUCTIONS.

(No.MB383)1-7
SECTION 3
DISASSEMBLY
3.1 Main body section
3.1.1 Removing the top cover
(See Figs.1 and 2)
(1) From the both sides of the main body, remove the four
screws Aattaching the top cover. (See Fig.1)
(2) From the back side of the main body, remove the five
screws Band screw Cattaching the top cover. (See Fig.2)
(3) Remove the top cover in the direction of the arrow. (See
Fig.1.)
Fig.1
Fig.2
A
Top cover
BTop cover
B B
C

1-8 (No.MB383)
3.1.2 Removing the front panel assembly
(See Figs.3 and 4)
• Remove the top cover.
(1) From the top side of the main body, remove the tie bands
bundling the wires. (See Fig.3.)
Reference:
After reassembling, bundle the wires with the new tie
bands as before. (See Fig.3.)
(2) Disconnect the card wire from the connector CN102 on the
main amplifier board. (See Fig.3)
(3) Disconnect the wire from the connector CN351 on the main
amplifier board. (See Fig.3)
(4) Disconnect the wire from the connector CN552 on the input
board. (See Fig.3)
(5) Disconnect the wire from the connector CN661 on the vol-
ume board. (See Fig.3)
(6) Remove the three screws Dattaching the front panel as-
sembly. (See Fig.3)
(7) Remove the screw Dattaching the OSD connect 2 board.
(See Fig.3)
(8) From the bottom side of the main body, remove the four
screws Eattaching the front panel assembly. (See Fig.4)
(9) Release the joints aand remove the front panel assembly
in the direction of the arrow. (See Fig.4)
Fig.3
Fig.4
D
Front panel assembly
D
D
OSD connect 2 board
Main amplifier board
CN102
CN351
Tie bands
Volume board
CN552
Input board
CN661
E
Front panel assembly
E
a

(No.MB383)1-9
3.1.3 Removing the rear panel
(See Fig.5)
• Remove the top cover.
(1) From the back side of the main body, remove the strain re-
lief from the rear panel in the direction of the arrow and re-
move the power cord.
(2) Remove the twenty-nine screws Fattaching the rear panel.
(3) Remove the nut and washer attaching the coaxial connec-
tor to the rear panel.
Fig.5
3.1.4 Removing the tuner
(See Fig.6)
• Remove the top cover.
(1) From the top side of the main body, disconnect the card
wire from the connector CN1 on the tuner.
(2) From the back side of the main body, remove the two
screws Gattaching the tuner to the rear panel and take out
the tuner.
3.1.5 Removing the subwoofer board
(See Fig.6)
• Remove the top cover.
(1) From the top side of the main body, disconnect the wire
from the connector CN524 on the subwoofer board.
(2) From the back side of the main body, remove the screw H
attaching the subwoofer board to the rear panel and take
out the subwoofer board.
3.1.6 Removing the compulink board
(See Fig.6)
• Remove the top cover.
(1) From the top side of the main body, disconnect the wire
from the connector CN565 on the compulink board.
(2) From the back side of the main body, remove the screw J
attaching the compulink board to the rear panel and take
out the compulink board.
3.1.7 Removing the front video board
(See Fig.6)
• Remove the top cover.
(1) From the top side of the main body, remove the tie band
bundling the wires.
Reference:
After reassembling, bundle the wires with the new tie
band as before.
(2) Disconnect the wire from the connector CN662 on the vol-
ume board
(3) From the back side of the main body, remove the two
screws K.
(4) Remove the nut and washer attaching the coaxial connec-
tor to the rear panel.
Fig.6
Strain relief
F
Rear panel
Power cord FF
J
Tuner
Volume board
CN524
Rear panel
GK H
Rear panel
Subwoofer board
Front video board
CN1
CN565
Tie band CN662
Coaxial connector
Nut and washer
Compulink board

1-10 (No.MB383)
3.1.8 Removing the power transformer
(See Fig.7)
• Remove the top cover.
(1) From the top side of the main body, remove the tie bands
bundling the wires.
Reference:
After reassembling, bundle the wires with the new tie
bands as before.
(2) Release the wire holder to remove the wires.
(3) Disconnect the wires from the connectors (CN106, CN111)
on the main amplifier board.
(4) Remove the soldered sections band remove the wires.
(5) Remove the four screws Mand take out the power trans-
former from the main body.
3.1.9 Removing the trans primary board
(See Fig.7)
• Remove the top cover.
(1) From the top side of the main body, remove the tie band
bundling the wires.
Reference:
After reassembling, bundle the wires with the new tie
band as before.
(2) Remove the wires from the soldered sections band re-
move the wires.
(3) Remove the solders from the soldered sections cand re-
move the trans primary board.
3.1.10 Removing the trans secondary board
(See Fig.7)
• Remove the top cover and power transformer.
From the side of the power transformer, remove the solders from
the soldered sections dand remove the trans secondary board.
Fig.7
3.1.11 Removing the DCDC control board
(See Fig.8)
• Remove the top cover.
From the top side of the main body, disconnect the DCDC control
board from the main amplifier board in an upward direction while
releasing the claw eof the connector CN152 on the main ampli-
fier board.
Note:
When releasing the claw e, take care not to break it.
Fig.8
Tie band
b
Wire holder
Power transformer
M
CN106
Main amplifier board
M M CN111
M
d
c
Trans primary
board
Trans secondary
board
DCDC control board
Main amplifier board
Main amplifier board
CN152
e
DCDC control board

(No.MB383)1-11
3.1.12 Removing the PWM modulation 1 board
(See Fig.9)
• Remove the top cover.
(1) From the top side of the main body, remove the tie band
bundling the wires.
Reference:
After reassembling, bundle the wires with a new tie band
as before.
(2) Disconnect the wire from the connector CN413 on the
PWM modulation 2 board.
(3) Disconnect the wires from the connectors (CN311, CN312,
CN313) on the PWM modulation 1 board.
(4) Disconnect the PWM modulation 1 board from the main
amplifier board in an upward direction while releasing the
claw fof the connector CN302 on the main amplifier board.
Note:
When releasing the claw f, take care not to break it.
3.1.13 Removing the PWM modulation 2 board
(See Fig.9)
• Remove the top cover.
(1) From the top side of the main body, disconnect the wires
from the connectors (CN411, CN412, CN413) on the PWM
modulation 2 board.
(2) Disconnect the PWM modulation 2 board from the main
amplifier board in an upward direction while releasing the
claw gof the connector CN402 on the main amplifier board.
Note:
When releasing the claw g, take care not to break it.
Fig.9
3.1.14 Removing the fan motor
(See Fig.10.)
• Remove the top cover.
(1) From the top side of the main body, remove the tie band
bundling the wires.
Reference:
After reassembling, bundle the wires with a new tie band
as before.
(2) Disconnect the wire from the connector CN103 on the main
amplifier board.
(3) Remove the screw Nand screw N'.
Reference:
When attaching the screw N', attach the wire holder with
it.
(4) Take out the fan motor assembly.
(5) Remove the two screws Pattaching the fan motor to the
fan bracket.
Fig.10
CN312
CN302
f
CN402
g
CN313 CN311
Tie band
CN413
CN412 CN411
PWM modulation 2 board
PWM modulation 1 board
Main amplifier
board
N'
Fan motor assembly
Wire holder
N
CN103
Main amplifier board
Tie band
P
Fan motor
P
Fan bracket

1-12 (No.MB383)
3.1.15 Removing the volume board
(See Fig.11)
• Remove the top cover and front video board.
(1) From the back side of the main body, remove the five
screws Qattaching the volume board to the rear panel.
(2) Remove the screw Rattaching the volume board.
(3) From the top side of the main body, remove the two screws
Sattaching the wire holder board and move the wire holder
board with the wires in the direction of the arrow.
(4) Disconnect the volume board from the DSP connect board
while releasing the claw hof the connector CN681 on the
volume board.
Note:
When releasing the claw h, take care not to break it.
(5) Take out the volume board and disconnect the wires from
the connectors (CN661, CN682, CN683) on the forward
side of the volume board.
Fig.11
R
Wire holder board
CN661
CN683
CN682
S
CN681
h
DSP connect
board Q
Rear panel
Volume
board
Volume board

(No.MB383)1-13
3.1.16 Removing the OSD board
(See Fig.12)
• Remove the top cover, front video board and volume board.
(1) Remove the solder from the section jto remove the earth
wire.
(2) Remove the screw Tattaching the support bracket on the
chassis base.
(3) Disconnect the OSD board from the connect 1 board and
connect 2 board while releasing the claws (k, m) of the con-
nectors (CN582, CN584) on the OSD board.
Note:
When releasing the claws (k, m), take care not to break
them.
(4) Remove the screw Uto remove the support bracket from
the OSD board.
3.1.17 Removing the primary board
(See Fig.12)
• Remove the top cover, front video board, volume board and
OSD board.
(1) From the top side of the main body, remove the tie bands
and disconnect the wire from the connector CN10 on the
main amplifier board.
Reference:
After connecting the wire, bundle the wires with the new
tie bands as before.
(2) Disconnect the power cord from the connector CN120 on
the primary board.
(3) Remove the three screws Vand screw V' attaching the pri-
mary board.
Reference:
When attaching the screw V', attach the wire holder with
it as before.
(4) Take out the primary board from the main body and remove
the wires from the soldered sections non the reverse side
of the primary board.
Fig.12
3.1.18 Removing the speaker terminal 1 and speaker terminal 2 boards
(See Fig. 13)
• Remove the top cover and rear panel.
Reference:
Remove the tuner and subwoofer board as required.
(1) From the top side of the main body, disconnect the wires
from the connectors (CN265, CN465) on the speaker ter-
minal 1 board.
(2) Take out the speaker terminal 1 board from the main body.
(3) Disconnect the wires from the connectors (CN209, CN262)
on the speaker terminal 2 board.
(4) Take out the speaker terminal 2 board from the main body.
Fig.13
VT
Wire holder
U
V'
VV
Tie bands
OSD
board
Earth
wire
n
Power cord
CN120
Chassis base
Primary board Support bracket
CN10
Main amplifier
board
CN582
k
Connect 1
board
OSD
board
CN584
m
j
Connect 2
board
OSD
board
CN265
CN262
CN465CN209
Speaker terminal 2 board Speaker terminal 1 board

1-14 (No.MB383)
3.1.19 Removing the DSP connect board
(See Fig.14)
• Remove the top cover, rear panel, tuner, compulink board,
front video board, volume board and OSD board.
Disconnect the DSP connect board from the input board in an up-
ward direction while releasing the claw pof the connector CN502
on the input board.
Note:
When releasing the claw p, take care not to break it.
3.1.20 Removing the connect 1 board and connect 2 board
(See Fig.14)
• Remove the top cover, rear panel, tuner, compulink board,
front video board, volume board and OSD board.
Disconnect the connect 1 board and connect 2 board from the in-
put board in an upward direction while releasing the claws (q, r)
of the connectors (CN581, CN583) on the input board.
Note:
When releasing the claws (q, r), take care not to break them.
Fig.14
3.1.21 Removing the input board
(See Fig. 15)
• Remove the top cover, rear panel, tuner, compulink board,
front video board, volume board, DSP connect board, connect
1 board and connect 2 board.
(1) Remove the tie band bundling the wires.
Reference:
After reassembling, bundle the wires with the new tie
band as before.
(2) Disconnect the wire from the connector CN209 on the
speaker terminal 2 board.
(3) Disconnect the wire from the connector CN513 on the OSD
connect 1 board.
(4) Disconnect the wires from the connectors (CN530, CN531,
CN552) on the input board.
(5) Disconnect the parallel wire from the connector CN540 on
the input board.
(6) Remove the three screws Wand take out the input board
from the main body.
Fig.15
CN583
r
Connect 2
board
Input board
CN502
p
DSP connect
board
Input board
CN581
q
Connect 1
board
Input board
CN552
CN540
CN530
CN531
W
Input board Speaker terminal 2 board
W
Tie band
CN209
CN513
OSD connect 1 board

(No.MB383)1-15
3.1.22 Removing the OSD connect 1 board
(See Fig.16)
• Remove the top cover and volume board.
(1) Remove the tie band bundling the wires.
(2) Disconnect the wire from the connector CN524 on the sub-
woofer board.
(3) Disconnect the wire from the connector CN513 on the OSD
connect 1 board.
(4) Disconnect the OSD connect 1 board from the main ampli-
fier board in an upward direction while releasing the claw s
of the connector CN222 on the main amplifier board.
Note:
When releasing the claw s, take care not to break it.
Fig.16
3.1.23 Removing the master clock board
(See Fig.17)
• Remove the top cover, tuner, front video board, volume board,
PWM modulation 1 board, PWM modulation 2 board and OSD
connect 1 board.
(1) Remove the two screws Xwith a short driver and remove
the transistor hold from the joints tof the heat sink.
(2) Disconnect the wire from the connector CN201 on the main
amplifier board.
(3) Take out the master clock board from the main body.
Fig.17
CN222
s
OSD connect 1
board
CN513
Tie band
OSD connect 1 board Main amplifier board
Subwoofer board
CN524
X
tt
Heat sink Transistor hold
Master clock board
Main amplifier board
CN201

1-16 (No.MB383)
3.1.24 Removing the main amplifier board
(See Figs.18 and 19)
• Remove the top cover, tuner, front video board, volume board,
DCDC control board, PWM modulation 1 board, PWM modu-
lation 2 board, OSD connect 1 board, OSD board and master
clock board.
(1) Disconnect the wire from the connector CN265 on the
speaker terminal 1 board. (See Fig.18.)
(2) Disconnect the wire from the connector CN262 on the
speaker terminal 2 board. (See Fig.18.)
(3) Remove the tie bands bundling the wires. (See Fig.18.)
Reference:
After reassembling, bundle the wires with the new tie
bands as before. (See Fig.18.)
(4) Disconnect the wires from the connectors (CN10, CN103,
CN106, CN111, CN351) on the main amplifier board. (See
Fig.18.)
(5) Disconnect the card wire from the connector CN102 on the
main amplifier board. (See Fig.18.)
(6) Disconnect the wires from the connectors (CN530, CN531)
on the input board. (See Fig.19.)
(7) Disconnect the parallel wire from the connector CN540 on
the input board. (See Fig.19.)
(8) Remove the four screws Yand two screws Z. (See Fig.19.)
(9) Take out the main amplifier board with the regulator board
from the main body. (See Fig.19.)
Fig.18
Fig.19
CN106 Main amplifier board
CN10
CN103
CN102
CN111 CN351
CN265
Speaker terminal 1 board
CN262
Speaker terminal 2 board
Tie bands Tie band
Main amplifier board
CN540
Z
Y
Y
Y
CN530
CN531
Input board
Regulator board

(No.MB383)1-17
3.1.25 Removing the regulator board
(See Fig.20)
• Remove the top cover, tuner, front video board, volume board,
DCDC control board, PWM modulation 1 board, PWM modu-
lation 2 board, OSD connect 1 board, master clock board and
main amplifier board.
(1) From the forward side of the main amplifier board, discon-
nect the wire from the connector CN105.
(2) Remove the two screws AA attaching the regulator board.
(3) Remove the regulator board and disconnect the parallel
wire from the connector CN104 on the main amplifier
board.
Fig.20
3.1.26 Removing the heat sink
(See Fig.21)
• Remove the top cover, tuner, front video board, volume board,
DCDC control board, PWM modulation 1 board, PWM modu-
lation 2 board, OSD connect 1 board, master clock board, main
amplifier board and regulator board.
(1) From the forward side of the main amplifier board, remove
the screw AB and remove the wire holder board with the
wires.
(2) Remove the five screws AC to remove the heat sink.
Fig.21
AA
CN105
Regulator board
CN104
Main amplifier board
Heat sink
AC
Main amplifier board
AC
Wire holder board
AB

1-18 (No.MB383)
3.2 Front panel assembly section
• Remove the front panel assembly.
(See "3.1.2 Removing the front panel assembly".)
3.2.1 Removing the JOG board
(See Figs. 1 and 2)
(1) From the inside of the front panel assembly, remove the
four screws Aattaching the JOG board. (See Fig.1.)
(2) Take out the JOG board while lifting it from the front panel
assembly little by little.
Reference:
The master volume knob and MULTI JOG knob are re-
moved from the front side simultaneously. (See Fig.2.)
(3) From the forward side of the JOG board, disconnect the
wire from the connector CN913. (See Fig.1)
3.2.2 Removing the OSD connect 2 board
(See Fig. 1)
(1) From the inside of the front panel assembly, remove the
two screws Aattaching the OSD connect 2 board.
(2) Disconnect the wire from the connector CN914 on the FL
board.
Fig.1
Fig.2
3.2.3 Removing the FL board
(See Fig. 3)
• Remove the JOG board.
(1) Disconnect the wire from the connector CN914 on the FL
board.
(2) Remove the eight screws Aand take out the FL board.
Fig.3
CN913
A
A
A
Front panel assembly
CN914
FL board
A
OSD connect 2 board
JOG board
Front panel assembly
MULTI JOG knob Master volume knob
A
A
Front panel assembly
CN914
FL board
A
A

(No.MB383)1-19
SECTION 4
ADJUSTMENT
This service manual does not describe ADJUSTMENT.
SECTION 5
TROUBLESHOOTING
This service manual does not describe TROUBLESHOOTING.

(No.MB383)
AV & MULTIMEDIA COMPANY AUDIO/VIDEO SYSTEMS CATEGORY 10-1,1chome,Ohwatari-machi,Maebashi-city,371-8543,Japan
Victor Company of Japan, Limited
VPT
Printed in Japan