JVC RX-DP20VBK User manual

SERVICE MANUAL
COPYRIGHT © 2003 VICTOR COMPANY OF JAPAN, LIMITED No.22008
2003/7
AUDIO/VIDEO CONTROL RECEIVER
RX-DP20VBK
TABLE OF CONTENTS
1 PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
2 SPECIFIC SERVICE INSTRUCTIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
3 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7
4 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-18
5 TROUBLE SHOOTING. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-21
AUD O/V DEO CONTROL RECE VER
RX DP20V
STANDBY/ON
STANDBY
PHONES
D MMER
CC CONVERTER
ZONE 1
ON/OFF
ZONE 2
ON/OFF
DOOR
UP
DOOR
DOWN
MASTER VOLUME
S-V DEOD G TAL VIDEO LÑAUDIOÑR
VIDEO
CHANNEL
TV VIDEO
MUT NG
DVD
N/ F O /O F
ST NDB / N ST NDB / N
S AND Y
T BS
ON
D MU CD
C R
HO O
PE M
XT 7 C
AN LOG D G T L
CC CO VER ER
FFECT
L V NESS
SOUND
EST
THX
XES71
AN LOG DI ECT
SLEEP DIMMER
M MODE
DSP URR DSPS RROUND
RE URN 0+
O F
NPU
SET
TU
M N
A JU
ENU
DVD
ME U E IT
T XT
I P A
123
456
7
/ 89
10 100
TV VOL
VOLUME
TUN NG
STOP PAU E
FF
REW
REC
PLAY
DOWN UP
RM SR DP20J RE OTE CO TROL
A V CONTROL RECE VER
CR 1 CR 2
FM AMID OV DB
ZO E 2
TR NSMTEA N
ONE 1
Z NE 1
ZONE 2 L ARNZO E 1
TV
CA V
BS
Area Suffix
J --------------- U.S.A.
C ------------- Canada

1-2 (No.22008)
SPECIFICATION
Amplifier Output Power At Stereo operation
(Analog Direct On) Front channels 120 W per channel, min. RMS, driven into 8 Ω, 20 Hz to 20 kHz with no more
than 0.02% total harmonic distortion. 120 W per channel, min. RMS, driven
into 4 Ω, 20 Hz to 20 kHz with no more than 0.07% total harmonic distortion.
At Surround operation
(Analog Direct On) Front channels 120 W per channel, min. RMS, driven into 8 Ω, 20 Hz to 20 kHz with no more
than 0.02% total harmonic distortion.
Center channel
120 W, min. RMS, driven into 8 Ω, 20 Hz to 20 kHz with no more than 0.02%
total harmonic distortion.
Surround channels
120 W per channel, min. RMS, driven into 8 Ω, 20 Hz to 20 kHz with no more
than 0.02% total harmonic distortion.
Surround back channels
120 W per channel, min. RMS, driven into 8 Ω, 20 Hz to 20 kHz with no more
than 0.02% total harmonic distortion.
Audio Audio Input
Sensitivity
/Impedance
(1 kHz)
PHONO IN (MC) 0.25 mV/100 Ω
(MM) 2.5 mV/47 kΩ
CD IN, CDR IN, TAPE/MD IN, EXT 7.1CH IN 200 mV/47 kΩ
DVD IN, VCR 1 IN, VCR 2 IN, TV SOUND/DBS IN, VIDEO 200 mV/47 kΩ
Audio Input
(DIGITAL IN)* Coaxial 1(DVD), 2(CD), 3(TV/DBS) 0.5 V(p-p)/75 Ω
Optical 4(CDR), 5(MD), 6(VCR1) -21 dBm to -15 dBm (660 nm ±30 nm)
* Corresponding to Linear PCM, Dolby Digital, and DTS Digital Surround
(with sampling frequency - 32 kHz, 44.1 kHz, 48 kHz)
Audio Output Level ZONE 2 PREOUT 200 mV
PREOUT 1 V
Recording Output
Level TAPE/MD OUT, CDR OUT, VCR 1 OUT, VCR 2 OUT 200 mV
Digital output Optical DIGITAL OUT
Signal wave length 660 nm
Output level
Signal-to-Noise Ratio
(‘66 IHF/’78 IHF)
(Analog Direct On)
PHONO IN (MC) 60 dB/72 dB (at REC OUT)
(MM) 72 dB/80 dB (at REC OUT)
CD IN, CDR IN, TAPE/MD IN, EXT 7.1CH IN 92 dB/80 dB
DVD IN, VCR 1 IN, VCR 2 IN, TV SOUND/DBS IN, VIDEO 92 dB/80 dB
Frequency Response
(8 Ω)PHONO IN (MC) 20 Hz to 20 kHz (±1 dB)
(MM) 20 Hz to 20 kHz (±1 dB)
CD IN, CDR IN, TAPE/MD IN, EXT 7.1CH IN 10 Hz to 100 kHz (+1 dB, -3 dB)
DVD IN, VCR 1 IN, VCR 2 IN, TV SOUND/DBS IN, VIDEO 10 Hz to 100 kHz (+1 dB, -3 dB)
RIAA Phono Equalization ±1.0 dB (20 Hz to 20 kHz)
Video Video Input
Sensitivity
/Impedance
Composite video
DVD IN, VCR 1 IN, VCR 2 IN, TV SOUND/DBS IN, VIDEO 1 V(p-p)/75 Ω
S-video
DVD IN, VCR 1 IN, VCR 2 IN, TV
SOUND/DBS IN, VIDEO
(Y: luminance) 1 V(p-p)/75Ω
(C: chrominance, burst) 0.286 V(p-p)/75 Ω
Component
1 IN (DVD), 2 IN,3 IN (Y: luminance) 1 V(p-p)/75 Ω
(PB, PR) 0.7 V(p-p)/75 Ω
Video Output
Level Composite video VCR 1 OUT,VCR 2 OUT,MONITOR OUT 1 V(p-p)/75 Ω
S-video
VCR 1 OUT, VCR 2 OUT, MON-
ITOR OUT
(Y: luminance) 1 V(p-p)/75Ω
(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
Signal-to-Noise Ratio 45 dB

(No.22008)1-3
Designs & specifications are subject to change without notice.
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 18.2 dBf (2.2 µV/75 Ω)
Stereo 38.2 dBf (22.3 µV/75 Ω)
Signal-to-Noise Ratio (IHF-A weighted) Monaural 78 dB at 85 dBf
Stereo 73 dB at 85 dBf
Total Harmonic Distortion Monaural 0.2% at 1 kHz
Stereo 0.3% at 1 kHz
Stereo Separation at REC OUT 40 dB at 1 kHz
Alternate Channel Selectivity 60 dB (±400 kHz)
Frequency Response 30 Hz to 15 kHz (+0.5 dB, -3 dB)
AM tuner Tuning Range 530 kHz to 1 710 kHz
Usable Sensitivity Loop antenna: 400 µV/m
Signal-to-Noise Ratio 50 dB (100 mV/m)
General Power Requirements AC 120V~, 60 Hz
Power Consumption 580 W/690 VA (at operation)
2.7 watts (in standby mode)
Dimensions (W ×H ×D) 445 mm ×177 mm ×475 mm
(17 9/16 in. ×7 in. ×18 3/4 in.)
Mass 23.5 kg (52 lbs)

1-4 (No.22008)
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 0.5µ
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 expose
d
metal part.
AC VOLTMETER
(Having 1000
ohms/volts,
or more sensitivity)
1500 10W
0.15 F AC TYPE

(No.22008)1-5
1.5 Importance administering point on the safety
Caution: For continued protection against risk of
fire, replace only with same type 8A/250V for F21,
0.5A/250V for F41 and 2A/125V for F42 and F43.
This symbol specifies type of fast operating fuse.
Precaution: Pour eviter risques de feux, remplacez
le fusible de surete de F21 comme le meme type
que 8A/250V, et 0.5A/250V pour F41, et 2A/125V
pour F42 et F43.
Ce sont des fusibles suretes qui functionnes rapide.
^
C21
C22
C23
C24
C25
C26
C27
PW23 PW21
WR26
PW22
D21
D22
D23
D24
D25
D26
D27
R26
Q21
Q22
Q23
R21
R22
R23
R24
R25
RY21
T21
PW25 PW26
R27
R28
CN25
EP21 PW24
EP22
FC22 FC21
C41
C42
CN41
C43
D45
Q53
Q54
Q55
FC41 FC42
R51 R54
R42
T42
WR41
WR42
R41
C60
D41
TW51
FC43FC44
R57
C40
WR48
C44
C49
C45 C46
C47 C48
R4011
R4012
C53
C54
C55
C56
R43
CN47
C59
IC44
D4001
D4002
D4003
D4004
C57 C58
R45
C51
D51
Q45
Q46
Q47
D48
D49
D50
FC401 FC402
TW42
CN46
Q41
Q42
Q43
Q44
C52
R55
R56
T41
R46
R47
R48
R49
R50
TH41
TW41
CN44CN45

1-6 (No.22008)
SECTION 2
SPECIFIC SERVICE INSTRUCTIONS
This service manual does not describe SPECIFIC SERVICE INSTRUCTIONS.

(No.22008)1-7
SECTION 3
DISASSEMBLY
3.1 Main body section
3.1.1 Removing the top cover
(See Fig.1)
(1) Remove the eight screws Aattaching the top cover on both
sides of the body.
(2) Remove the three screws Bon back of the body.
(3) Remove the top cover from behind in the direction of the ar-
row while pulling both sides outward.
Fig.1
3.1.2 Removing the front panel assembly
(See Fig.2 and 3)
• Prior to performing the following procedure, remove the top
cover.
(1) Cut off the tie band 1 fixing the harness.
(2) Remove the screw a, and remove the lug wire.
(3) Remove the three screws Cattaching the front panel as-
sembly.
(4) Remove the four screws Dattaching the front panel as-
sembly on bottom of the body. Detach the front panel as-
sembly toward the front.
(5) Disconnect the harness from the connector CN971,
CN977, CN983 and CN985 on the system control board
(see fig.5), CN973 on the front AV in board and CN373 on
the front DIGITAL board (see 2-3.Front panel assembly
section/ fig.2).
Fig.2
Fig.3
A
(both sides)
A(both sides)
B
Top cover
C
a
(fixing the
lug wire) Tie band 1
Harness
band
Tuner unit
Compu
link board
Audio 7.1ch
in board
V compo 2 board
Y/C separator
board
RF remote unit
CN1
CN1
C
Front panel assembly
CN581
CN481
CN482
CN301
CN201
Tie band 2
Tie band 3
Audio signal
1 board
D
D
Front panel
assembly

1-8 (No.22008)
3.1.3 Removing the V compo 2 board & RF remote unit & tuner unit & compu link board
(See Fig.2 and 4)
• Prior to performing the following procedure, remove the top
cover.
(1) Disconnect the harness from the connector CN581 on the
V compo 2 board.
Remove the two screws E' attaching the V compo 2 board
to the rear panel.
(2) Disconnect the harness from the connector CN1 on the RF
remote unit.
Remove the nut b attaching the RF remote unit to the rear
panel.
(3) Disconnect the card wire from the connector CN1 on the
tuner unit.
Remove the two screws E'' attaching the tuner unit to the
rear panel.
(4) Disconnect the harness from the connector CN301 on the
compu link board.
Remove the four screws E''' attaching the compu link
board to the rear panel.
3.1.4 Removing the Y/C separator board
(See Fig.2)
• Prior to performing the following procedure, remove the top
cover.
(1) Cut off the tie band 2 fixing the harness.
(2) Draw out up the Y/C separator board, disconnecting the
connectors CN481 and CN482 on the Y/C separator board.
3.1.5 Removing the audio 7.1ch in board
(See Fig.2 and 4)
• Prior to performing the following procedure, remove the top
cover.
(1) Cut off the tie band 2 & 3 fixing the harness.
(2) Disconnect the harness from the connector CN201 on the
audio signal 1 board.
(3) Remove the two screws E'''' attaching the audio 7.1ch in
board to the rear panel.
3.1.6 Removing the rear panel
(See Fig.4)
• Prior to performing the following procedure, remove the top
cover.
(1) Unsolder the two solder parts on the AC inlet.
(2) Remove the forty four screws E& E' & E'' & E''' & E'''' and
the nut b attaching each board to the rear panel.
(3) Remove the thirteen screws Fattaching the rear panel on
the back of the body and bottom.
Fig.2
Fig.4
C
a
(fixing the
lug wire) Tie band 1
Harness
band
Tuner unit
Compu
link board
Audio 7.1ch
in board
V compo 2 board
Y/C separator
board
RF remote unit
CN1
CN1
C
Front panel assembly
CN581
CN481
CN482
CN301
CN201
Tie band 2
Tie band 3
Audio signal
1 board
b
E
F
E''' E
FF F
F
Rear panel
Red
Black
E
EE''
E''''
E'
E
E
F
Solder part
AC inlet

(No.22008)1-9
3.1.7 Removing the system control board
(See Fig.5 and 6)
• Prior to performing the following procedure, remove the top
cover and front panel assembly.
(1) Disconnect the card wires and harness from the connector
CN963, CN964 and CN981 on the system control board.
(2) Cut off the tie bands fixing the harness.
(3) Disconnect the harness from the connector CN45 on the
power supply 2 board and CN25 on the power/ fuse board.
(4) Disconnect the connector CN324 on the audio signal 2
board and CN234, CN208 on the audio signal 1 board.
(5) Remove the three plastic rivet.
Fig.5
Fig.6
3.1.8 Removing the DSP board & shield cover
(See Fig.7)
• Prior to performing the following procedure, remove the top
cover, rear panel and front panel assembly.
(1) Disconnect the connector CN631 on the DSP board.
(2) Disconnect the connector CN203 on the audio signal 1
board.
And cut off the tie bands fixing the harness.
(3) Removing the two plastic rivet, and disconnect the connec-
tor CN633, CN643 and CN635 on the DSP board.
(4) Removing the screw Gattaching the shield cover and re-
move the shield cover.
Fig.7
CN963
CN981
CN971
CN977
CN983
CN964
CN985
System control board
Plastic rivet
Plastic rivet
CN324
CN25
CN234
CN208
CN224
CN45
(on power
supply 2
board)
Power/ fuse
board
Audio signal 1 board
Audio signal 2 board
CN203
Tie band
Tie band
Shield cover
Shield cover
Top view
CN631
CN635
CN643
Plastic rivet
DSP board
G
CN203
CN633
Audio signal
1 board

1-10 (No.22008)
3.1.9 Removing the audio signal 1 board
(See Fig.8)
• Prior to performing the following procedure, remove the top
cover, rear panel and DSP board.
(1) Disconnect the harness from the connector CN202,
CN204, CN234, CN224, CN208, CN207, CN218 and
CN223 on the audio signal 1 board.
(2) Remove the plastic rivet.
(3) Disconnect the connector CN205, CN221 and CN206 on
the audio signal 1 board.
Fig.8
3.1.10 Removing the audio signal 2 board & video board & S video board
(See Fig.9 to 11)
• Prior to performing the following procedure, remove the top
cover, rear panel, Y/C separator board, DSP board and audio
signal 1 board.
(1) Disconnect the harness from the connector CN973 on the
front AV in board (see 2-3.Front panel assembly section/
fig.2).
(2) Disconnect the harness from the connector CN324 on the
audio signal 2 board.
(3) Remove the audio signal 2 board from the connector CN15
and CN6 on the input base board.
(4) Remove the video board from the connector CN7 on the in-
put base board.
(5) Remove the S video board from the connector CN8 on the
input base board.
3.1.11 Removing the V compo 1 board
(See Fig.9 to 11)
• Prior to performing the following procedure, remove the top
cover and rear panel.
(1) Remove the V compo 1 board from the connector CN9 on
the input base board.
Fig.9
Fig.10
Fig.11
Audio signal 1 board
CN234
Plastic rivet
CN224
CN204
CN202
CN205
CN221
CN206
CN208
CN223
CN207
CN218
Video board
V compo 1 board
Audio signal 2 board S video board
CN324
Input base board
Connection between the Input base board and each board.
CN15/CN6
CN7
CN8
CN9
Audio signal 2 board (CN325/CN321)
Video board (CN401)
S video board (CN451)
V compo 1 board (CN501)
Input base board
CN15
CN6
CN7
CN8CN9

(No.22008)1-11
3.1.12 Removing the input base board
(See Fig.12)
• Prior to performing the following procedure, remove the top
cover, rear panel, DSP board, audio signal 1 board, audio sig-
nal 2 board, video board, S video board and V compo 1 board.
(1) Disconnect the harness from the connector CN62 on the
power supply 1 board and CN44 on the power supply 2
board.
And cut off the tie bands fixing the harness.
(2) Disconnect the harness from the connector CN743 on the
speaker board.
(3) Disconnect the card wire from the connector CN1, CN2
and the harness from the connector CN11 on the input
base board.
(4) Remove the seven screws Hattaching the input base
board.
3.1.13 Removing the speaker board
(See Fig.12)
• Prior to performing the following procedure, remove the top
cover and rear panel.
(1) Disconnect the harness from the connector CN741, CN742
and CN743 on the speaker board.
Fig.12
3.1.14 Removing the power supply 1 board
(See Fig.13)
• Prior to performing the following procedure, remove the top
cover.
(1) Disconnect the harness from the connector CN61, CN62,
CN63, CN64 and CN65 on the power supply 1 board.
(2) Disconnect the harness from the connector CN44 and
CN45 on the power supply 2 board.
(3)
Fig.13
CN743
CN742
CN741
Speaker board
Input base board
Power supply
1 board CN44
(on the power
supply 2 board)
CN62
H
CN2
CN1
CN11
H
CN63
CN64
CN62
CN44/CN45
(on the power
supply 2 board)
CN65
CN61
(fixing the
lug wire)
Power supply 1 board
II

1-12 (No.22008)
3.1.15 Removing the power transformer 1 with the power supply 2 board
(See Fig.14)
• Prior to performing the following procedure, remove the top
cover and power supply 1 board.
(1) Disconnect the harness from the connector CN46 and
CN47 on the power supply 2 board.
(2) Remove the two screws Jattaching the power transformer
1.
3.1.16 Removing the thermal SW 1 board
(See Fig.14)
• Prior to performing the following procedure, remove the top
cover and power supply 1 board.
(1) Remove the screw Kattaching the thermal SW 1 board.
Fig.14
3.1.17 Removing the power transformer 2
(See Fig.15 and 16)
• Prior to performing the following procedure, remove the top
cover and power supply 1 board.
(1) Disconnect the harness from the connector CN701 on the
power amp. board.
(2) Unsolder the solder points PW81 and PW82 on the power
trans board.
(3) Remove the four screws Lattaching the power transformer
2.
Fig.15
Fig.16
K
Power supply 2 board
CN47 CN46
J
Power
transformer 1
Thermal SW
1 board
Power amp. board
CN701
LL
PW81
PW82
Power trans
board
Power
transformer 2

(No.22008)1-13
3.1.18 Removing the power transformer 3 with the power supply 3 board
(See Fig.17)
• Prior to performing the following procedure, remove the top
cover, power supply 1 board, power transformer 1 and power
transformer 2.
(1) Disconnect the harness from the connector CN41 on the
power supply 3 board.
(2) Remove the two screws Mattaching the power transformer
3.
Fig.17
3.1.19 Removing the power/ fuse board
(See Fig.18)
• Prior to performing the following procedure, remove the top
cover, rear panel, power supply 1 board and power transform-
er 2.
(1) Disconnect the harness from the connector CN25 on the
power/ fuse board.
(2) Remove the four screws Nattaching the power/ fuse
board.
(3) Unsolder the solder points PW21, PW22, PW23 and PW24
on the power/ fuse board.
Fig.18
3.1.20 Removing the head phone board
(See Fig.19 and 20)
• Prior to performing the following procedures, remove the top
cover and front panel assembly.
(1) Disconnect the harnesses from the connector CN981 on
the system control board (see fig.5) and CN738 on the
power amp. board.
(2) Removing the nut Ofixing the head phone board.
(3) Removing the screw Pattaching the lug wire and bracket.
Fig.19
Fig.20
Power supply 3 board
CN41
M
Power
transformer 3
PW21 (blue)
PW22 (brown)
PW23 (red)
PW24 (white)
NN
N
Power/ fuse board
CN25
PO
Head phone board
Lug wire Bracket
(Front side)
Q
Q
R
Power
amp.
assembly
Power amp.
board
Barrier
CN738

1-14 (No.22008)
3.1.21 Removing the power amp. Assembly
(See Fig.20 and 21)
• Prior to performing the following procedures, remove the top
cover, rear panel, front panel assembly, system control board,
DSP board, audio signal 1 board, audio signal 2 board, video
board, S video board, V compo 1 board and speaker board.
(1) Remove the three screws Qfixing the barriers, and remove
the tow barriers.
(2) Remove the eight screws Rattaching the power amp. as-
sembly.
(3) Pull up the power amp. assembly.
Fig.20
Fig.21
(Front side)
Q
Q
R
Power
amp.
assembly
Power amp.
board
Barrier
CN738
R(Rear side)

(No.22008)1-15
3.2 Power amp. assembly section
3.2.1 Removing the relay board & Rch amp. board & Lch amp. board & Cch amp. board & SL/SRch amp. board
(See Fig.1 to 3)
• Prior to performing the following procedure, remove the power
amp. assembly.
(1) Disconnect the harness from the two connectors on each
thermal compensation board (top side).
(2) Remove the two screws A attaching the relay board.
(3) Disconnect the harness from the five connectors on each
thermal compensation board (bottom side).
(4) Pull up each amp. board of Lch, Cch, SL/SRch and Rch
from the power amp. board with the relay board.
(5) Remove each amp. board from the connector CN721,
CN821, CN781 and CN761 on the relay board.
Fig.1
Fig.2
Fig.3
Connector
(on the thermal
compensation
board)
top side
SL/SRch amp. board
Rch amp. board
Lch amp. board
Connector
(on the thermal
compensation
board)
Connector (on the thermal
compensation board)
Power amp. board
CN713
CN773
CN753
CN712
CN772
CN752
CN813 CN812
Cch amp. board Abottom side
Relay board
A
SL/SRch amp. board
Rch amp. board
Lch amp. board
Cch amp. board
CN721 CN821
CN781
CN761
Relay board

1-16 (No.22008)
3.2.2 Removing the thermal SW 2 board
(See Fig.4)
• Prior to performing the following procedure, remove the power
amp. assembly, relay board and each amp. board of Lch, Cch,
SL/SRch, Rch.
(1) Remove the screw Battaching the thermal SW 2 board.
3.2.3 Removing the heat sink
(See Fig.4 to 6)
• Prior to performing the following procedure, remove the power
amp. assembly, relay board and each amp. board of Lch, Cch,
SL/SRch, Rch.
(1) Remove the eight screws Cattaching the heat sink on the
both sides of the power amp. assembly.
(2) Remove the eight screws Dattaching the power ICs (top
side).
(3) Remove the twenty screws Dattaching the power ICs (bot-
tom side). Fig.4
Fig.5
Fig.6
C (both sides)
B
Heat sink Power ICs Thermal SW 2 board
bottom side
Heat sink
top side
DD
DD
Heat sink
bottom side

(No.22008)1-17
3.3 Front panel assembly section
3.3.1 Removing the FL display board & front AV in board
(See Fig.1 and 2)
• Prior to performing the following procedure, remove the top
cover and front panel assembly.
(1) Pull out the volume knob on the front side of the front panel
assembly and remove the nut attaching the FL display
board.
(2) Remove the three screws Aattaching the front AV in board
and remove the front AV in board.
(3) Remove the nine screws Battaching the FL display board
on the back of the front panel assembly.
(4) Disconnect the harness from the connector CN969, CN975
and CN982 on the FL display board.
Fig.1
Fig.2
3.3.2 Removing the power switch board & front DIGITAL in board & motor assembly
(See Fig.3)
• Prior to performing the following procedure, remove the front
panel assembly and FL display board.
(1) Remove the four screws Cattaching the power switch
board and remove the power switch board.
(2) Remove the screw Dattaching the front DIGITAL in board
and remove the front DIGITAL in board.
(3) Remove the three screws Eattaching the motor assembly
on the back of the front panel assembly.
(4) Remove the belt and the two screws aattaching the motor.
3.3.3 Removing the door input board
(See Fig.3 and 4)
• Prior to performing the following procedure, remove the front
panel assembly and FL display board.
(1) Remove the four screws Fattaching the door and remove
the door from the front panel assembly.
(2) Remove the six screws Gattaching the door input board. Fig.3
Fig.4
Front panel assembly
Nut
Volume knob
Operation switch panel
Door
FL display board
B
B
CN982
CN973A
CN969
CN975
Front AV in board
CN373
B
Power switch board
Front DIGITAL
in board
C
E
D
FF
Motor assembly
Door Belt
a
CN373
Door input board
G
Door

1-18 (No.22008)
SECTION 4
ADJUSTMENT
4.1 Adjustment of idling current
Attention:
This adjustment does not obtain a correct adjustment value immediately after the amplifier is used (state that an internal temperature
has risen).
Please adjust immediately after using the amplifier after turning off the power supply of the amplifier and falling an internal temper-
ature.
Adjustment method
(1) Prior to turning the power ON, fully turn the adjusting resistor (VR701, VR702, VR751, VR752, VR771, VR772, VR801) coun-
terclockwise direction and connect the DC voltmeter to the measuring terminal (B901-B902, B903-B904, B905-B906, B907-
B908, B909-B910, B911-B912, B913-B914).
(2) Adjust the resistor so that the measured value becomes 2.0mV just after the power supply is turned on.
(3) Adjust the resistor so that the measured value becomes 2.5mV more than 60 seconds after the power supply is turned on.
(4) After stability is 1.0-4.0mV.
Refer to following page "Idling Current graph".
* It is not abnormal though the idling current might not become 0mA even if it is finished to turn variable resistance (VR701, VR702,
VR751, VR752, VR771, VR772, VR801) in the direction of counterclockwise.
Measuring point Alignment point Measuring condition
Lch B903 & B904 VR701 No load and No signal.Rated line voltage
SURROUND : OFF
Room temperature : 20~25ºC
Rch B911 & B912 VR751
Cch B907 & B908 VR801
SLch B907 & B908 VR771
SRch B909 & B910 VR772
SBLch B901 & B902 VR702
SBRch B913 & B914 VR752
B901, B902 (SBLch)
B903, B904 (Lch)
B905, B906 (SLch)
B907, B908 (Cch)
B909, B910 (SRch)
B911, B912 (Rch)
B913, B914 (SBRch)
VR701 (Lch)
VR801 (Cch)
VR771 (SLch)
VR702 (SBLch)
VR772 (SRch)
VR752 (SBRch)
VR751 (Rch)

(No.22008)1-19
4.2 Idling Current graph (1/2)
SL ch / SR ch
0
0.5
1
1.5
2
2.5
3
3.5
4
02468101214
Time(Min)
Voltage at measering point(mV)
SL ch
SR ch
SBL ch / SBR ch
0
0.5
1
1.5
2
2.5
3
3.5
4
02468101214
Time(Min)
SBL ch
SBR ch
Voltage at measering point(mV)

1-20 (No.22008)
4.3 Idling Current graph (2/2)
L ch / R ch
0
0.5
1
1.5
2
2.5
3
3.5
4
02468101214
Time(Min)
Voltage at measering point(mV)
L ch
R ch
C ch
0
0.5
1
1.5
2
2.5
3
3.5
4
02468101214
Time(Min)
Voltage at measering point(mV)