JVC RX-D402B User manual

SERVICE MANUAL
COPYRIGHT © 2005 Victor Company of Japan, Limited No.MB448
2005/9
AUDIO/VIDEO CONTROL RECEIVER
MB44820059
RX-D402B, RX-D401S
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
J ---------------------------- U.S.A.

1-2 (No.MB448)
SPECIFICATION
*Corresponding to Linear PCM, Dolby Digital, and DTS (with sampling frequency -32 kHz, 44.1 kHz, 48 kHz).
Designs and specifications are subject to change without notice.
Amplifier Output Power At stereo operation Front channels 110 W per channel, min. RMS, driven into 6
Ωat 20 Hz to 20 kHz with no more than 0.8%
total harmonic 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 har-
monic distortion.
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 har-
monic distortion.
Surround back channels 110 W per channel, min. RMS, driven into 6
Ωat 1 kHz, with no more than 0.8% total har-
monic distortion.
Audio Audio Input Sensitivity/
Impedance
DVR/DVD, VCR, DBS, TV 270 mV/47 kΩ
Audio Input
(DIGITAL IN)*
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
Audio Output Level DVR, VCR 270 mV
Signal-to-Noise Ratio ('66 IHF/'78 IHF) 80 dB/62 dB
Frequency Response (6 Ω) 20 Hz to 20 kHz (±1 dB)
Bass Boost +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
HDMI HDMI Input (Ver. 1.1) VCR (DBS), DVR/DVD
HDMI Output (Ver. 1.0) MONITOR OUT
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 inch-
es ×3 5/8 inches ×14 5/8 inches)
Mass 7.1 kg (15.7 lbs)

(No.MB448)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.MB448)
1.5 Importance administering point on the safety
Caution: For continued protection against risk of
fire, replace only with same type 4 A/125 V for
F101, 4 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 4 A/125 V, 4 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.MB448)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.MB448)
SECTION 2
SPECIFIC SERVICE INSTRUCTIONS
This service manual does not describe SPECIFIC SERVICE INSTRUCTIONS.

(No.MB448)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
3.1.2 Removing the HDMI board
(See Fig.3)
• Remove the top cover.
(1) From the back side of the main body, remove the three
screws Dattaching the HDMI board to the rear panel.
(2) From the top side of the main body, remove the screw Eat-
taching the HDMI board to the support bracket.
(3) Disconnect the card wires from the connectors (CN731,
CN732, CN762) on the HDMI board.
(4) Take out the HDMI board from the main body and discon-
nect the parallel wires from the connectors (CN771,
CN772) on the reverse side of the HDMI board.
Reference:
Remove the shield from the HDMI board as required.
Fig.3
A
Top cover
BTop cover
B B
C
E
D
Shield
CN732
CN731
CN771
CN762
CN772 HDMI board
Rear panel
Support bracket

1-8 (No.MB448)
3.1.3 Removing the front panel assembly
(See Figs.4 and 5)
• Remove the top cover and HDMI board.
(1) From the top side of the main body, remove the tie band
bundling the wires. (See Fig.4.)
Reference:
After reassembling, bundle the wires with a new tie band
as before. (See Fig.4.)
(2) Release the wire holders bundling the wires. (See Fig.4)
(3) Disconnect the card wire from the connector CN102 on the
main amplifier board. (See Fig.4)
(4) Disconnect the wire from the connector CN351 on the main
amplifier board. (See Fig.4)
(5) Disconnect the wire from the connector CN552 on the input
board. (See Fig.4)
(6) Disconnect the wire from the connector CN661 on the DSP
board. (See Fig.4)
(7) Remove the three screws Fattaching the front panel as-
sembly. (See Fig.4)
(8) Remove the screw Fattaching the OSD connect 2 board.
(See Fig.4)
(9) From the bottom side of the main body, remove the four
screws Fattaching the front panel assembly. (See Fig.5)
(10) Release the joints aand remove the front panel assembly
in the direction of the arrow. (See Fig.5)
Fig.4
Fig.5
F
F
Tie band
Wire holders
Wire holder
CN552
Input board
CN661
CN351
DSP board
OSD connect 2 board
CN102
F
F
Wire holder
Main amplifier board
F
Front panel assembly
F
a

(No.MB448)1-9
3.1.4 Removing the rear panel
(See Fig.6)
• 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 three screws Gand twenty-seven screws H
attaching the rear panel.
Fig.6
3.1.5 Removing the tuner
(See Fig.7)
• 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 Jattaching the tuner to the rear panel and take out
the tuner.
3.1.6 Removing the subwoofer board
(See Fig.7)
• 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 K
attaching the subwoofer board to the rear panel and take
out the subwoofer board.
3.1.7 Removing the DSP board
(See Fig.7)
• Remove the top cover.
(1) From the back side of the main body, remove the five
screws Mattaching the DSP board to the rear panel.
(2) Remove the screw Nattaching the DSP board.
(3) Disconnect the DSP board from the DSP connect board
while releasing the claw bof the connector CN681 on the
DSP board.
Note:
When releasing the claw b, take care not to break it.
(4) Take out the DSP board and disconnect the wires from the
connectors (CN661, CN682, CN683) on the forward side of
the DSP board.
(5) Disconnect the card wires from the connectors (CN651,
CN652) on the forward side of the DSP board.
Fig.7
Strain relief
H
Rear panel
Power cord G HHG H
NCN682
CN683
DSP board
CN661CN652
CN651 Tuner
Rear panel Rear panel
CN1 CN524
Subwoofer board
KJ
M
CN681
DSP board
b
DSP connect board

1-10 (No.MB448)
3.1.8 Removing the compulink board
(See Fig.8)
• Remove the top cover and HDMI board.
(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 P
attaching the compulink board to the rear panel and take
out the compulink board.
3.1.9 Removing the primary board
(See Fig.8)
• Remove the top cover and HDMI board.
(1) From the top side of the main body, remove the screw Q
attaching the support bracket on the chassis base.
(2) Release the wire holders and disconnect the wire from the
connector CN101 on the main amplifier board.
(3) Disconnect the power cord from the connector CN120 on
the primary board.
(4) Remove the two screws Rand two screws R' attaching the
primary board.
Reference:
When attaching the screws R', attach the wire holders
with them as before.
(5) Take out the primary board from the main body and remove
the wires from the soldered sections con the reverse side
of the primary board.
Fig.8
R'
R
c
R' R
Q
P
Compulink board
Rear panel
Wire holder
CN120
Support bracket
Main amplifier board
Wire holderCN101
Wire holder
Chassis base
Primary board
CN565

(No.MB448)1-11
3.1.10 Removing the power transformer
(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) Release the wire holders to remove the wires.
(3) Disconnect the wires from the connectors (CN106, CN111)
on the main amplifier board.
(4) Remove the soldered sections dand remove the wires.
(5) Remove the four screws Sand take out the power trans-
former from the main body.
3.1.11 Removing the trans primary 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) Remove the wires from the soldered sections dand re-
move the wires.
(3) Remove the solders from the soldered sections eand re-
move the trans primary board.
3.1.12 Removing the trans secondary board
(See Fig.9)
• Remove the top cover.
Reference:
Take out the power transformer from the main body as re-
quired.
From the side of the power transformer, remove the solders from
the soldered sections fand remove the trans secondary board.
Fig.9
f
SCN106 CN111
Wire holder
Tie band
S
S
e
d
Trans primary
board
Trans secondary
board
Main amplifier board
Wire holders

1-12 (No.MB448)
3.1.13 Removing the DCDC control board
(See Fig.10)
• 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 gof the connector CN152 on the main ampli-
fier board.
Note:
When releasing the claw g, take care not to break it.
Fig.10
3.1.14 Removing the PWM modulation 1 board
(See Fig.11)
• Remove the top cover.
(1) Disconnect the wire from the connector CN413 on the
PWM modulation 2 board.
(2) Disconnect the wires from the connectors (CN311, CN312,
CN313) on the PWM modulation 1 board.
(3) Disconnect the PWM modulation 1 board from the main
amplifier board in an upward direction while releasing the
claw hof the connector CN302 on the main amplifier board.
Note:
When releasing the claw h, take care not to break it.
3.1.15 Removing the PWM modulation 2 board
(See Fig.11)
• 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 jof the connector CN402 on the main amplifier board.
Note:
When releasing the claw j, take care not to break it.
Fig.11
Main amplifier board
Main amplifier board
DCDC control board
CN152
g
DCDC control board
CN312
Main amplifier
board
CN302
h
CN402
j
CN313 CN311
CN411CN413CN412
PWM modulation 1 board
PWM modulation 2 board

(No.MB448)1-13
3.1.16 Removing the cooling fan
(See Fig.12.)
• Remove the top cover.
(1) Disconnect the wire from the connector CN103 on the main
amplifier board.
(2) Remove the screw Tand screw T'.
Reference:
When attaching the screw T', attach the wire holder with
it.
(3) Take out the cooling fan assembly.
(4) Remove the four screws Uattaching the cooling fan to the
fan bracket.
Fig.12
3.1.17 Removing the speaker terminal 1 and speaker terminal 2 boards
(See Fig. 13)
• Remove the top cover and rear panel.
Reference:
Remove the tuner, subwoofer board and DSP board as re-
quired.
(1) From the top side of the main body, disconnect the wire
from the connector CN265 on the speaker terminal 1
board.
(2) Disconnect the parallel wire from the connector CN465 on
the speaker terminal 1 board.
(3) Take out the speaker terminal 1 board from the main body.
(4) Disconnect the wires from the connectors (CN209, CN262)
on the speaker terminal 2 board.
(5) Take out the speaker terminal 2 board from the main body.
Fig.13
T'
T
CN103
Cooling fan
U
Fan bracket
Wire holder
Main amplifier board
Cooling fan assembly
U
CN265
CN262
CN465CN209
Speaker terminal 2 board
Speaker terminal 1 board

1-14 (No.MB448)
3.1.18 Removing the DSP connect board
(See Fig.14)
• Remove the top cover, tuner and DSP board.
(1) Disconnect the wire from the connector CN209 on the
speaker terminal 2 board.
(2) Disconnect the DSP connect board from the input board in
an upward direction while releasing the claw kof the con-
nector CN502 on the input board.
Note:
When releasing the claw k, take care not to break it.
(3) Disconnect the connector CN516 on the DSP connect
board from the input board.
3.1.19 Removing the OSD connect 1 board
(See Fig.14)
• Remove the top cover, tuner and DSP board.
(1) Disconnect the wire from the connector CN524 on the sub-
woofer board.
(2) Disconnect the wire from the connector CN513 on the OSD
connect 1 board.
(3) Disconnect the OSD connect 1 board from the main ampli-
fier board in an upward direction while releasing the claw m
of the connector CN222 on the main amplifier board.
Note:
When releasing the claw m, take care not to break it.
Fig.14
3.1.20 Removing the input board
(See Fig. 15)
• Remove the top cover, HDMI board, rear panel, tuner, sub-
woofer board, DSP board, compulink board and DSP connect
board.
(1) Disconnect the wire from the connector CN513 on the OSD
connect 1 board.
(2) Disconnect the wires from the connectors (CN530, CN531,
CN552) on the input board.
(3) Disconnect the parallel wire from the connector CN540 on
the input board.
(4) Remove the three screws Vand take out the input board
from the main body.
Fig.15
CN222
m
OSD connect 1
board
CN516 CN209 CN524
DSP connect board
OSD connect 1 board
Speaker terminal
2 board
Input board CN513 Main amplifier board
Subwoofer
board
CN502
k
DSP connect
board
Input board
CN552
CN540
CN530
CN531
CN513
OSD connect 1 board
V V

(No.MB448)1-15
3.1.21 Removing the master clock board
(See Fig.16)
• Remove the top cover, tuner, DSP board, PWM modulation 1
board, PWM modulation 2 board and OSD connect 1 board.
(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 CN201 on the main
amplifier board.
(3) Remove the two screws Wwith a short driver and remove
the transistor hold from the joints nof the heat sink.
(4) Take out the master clock board from the main body.
Fig.16
3.1.22 Removing the HDMI-Regulator board
(See Fig.17)
• Remove the top cover.
(1) From the top side of the main body, disconnect the wire
from the connector CN117 on the forward side of the regu-
lator board.
(2) Remove the two screws Xattaching the HDMI-Regulator
board on the chassis base.
(3) Take out the HDMI-Regulator board from the main body.
Fig.17
W
nn
Tie band
Transistor hold
Master clock board
Main amplifier board
CN201
HDMI-Regulator board
CN117 Regulator board
Chassis base
X
HDMI-Regulator board

1-16 (No.MB448)
3.1.23 Removing the main amplifier board
(See Figs.18 and 19)
• Remove the top cover, HDMI board, front panel assembly, tun-
er, DSP board, DCD control board, PWM modulation 1 board,
PWM modulation 2 board, OSD connect 1 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) Disconnect the wires from the connectors (CN103, CN106,
CN111) on the main amplifier board. (See Fig.18.)
(4) Disconnect the parallel wire from the connector CN101 on
the main amplifier board. (See Fig.18.)
(5) Disconnect the wire from the connector CN117 on the for-
ward side of the regulator 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
CN101 CN117
CN103
CN111
CN265
Speaker terminal 1 board
CN262Regulator board
Speaker terminal 2 board
Main amplifier board
CN540
Z
Y
Y
Y
CN530
CN531
Input board

(No.MB448)1-17
3.1.24 Removing the regulator board
(See Fig.20)
• Remove the top cover, HDMI board, front panel assembly, tun-
er, DSP board, DCD control board, PWM modulation 1 board,
PWM modulation 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) Disconnect the wire from the connector CN114 on the reg-
ulator board.
(3) Remove the two screws AA attaching the regulator board.
Fig.20
3.1.25 Removing the heat sink
(See Fig.21)
• Remove the top cover, HDMI board, front panel assembly, tun-
er, DSP board, DCD control board, PWM modulation 1 board,
PWM modulation 2 board, OSD connect 1 board, master clock
board and main amplifier 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
Main amplifier board
CN114
Heat sink
AC
Main amplifier board
AC
Wire holder board
AB

1-18 (No.MB448)
3.2 Front panel assembly section
• Remove the front panel assembly.
(See "3.1.3 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 SOURCE SELEC-
TOR knob are removed from the front side simulta-
neously. (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) Remove the eight screws Aand take out the FL board.
(2) Disconnect the wire from the connector CN914 on 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
SOURCE SELECTOR knob
MASTER VOLUME knob
A
A
Front panel assembly
CN914
FL board
A
A

(No.MB448)1-19
SECTION 4
ADJUSTMENT
This service manual does not describe ADJUSTMENT.
SECTION 5
TROUBLESHOOTING
This service manual does not describe TROUBLESHOOTING.

(No.MB448)
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