JVC RX-DP20VSL User manual

SERVICE MANUAL
COPYRIGHT © 2003 VICTOR COMPANY OF JAPAN, LIMITED No.22019
2003/10
AUDIO/VIDEO CONTROL RECEIVER
22019200310 RX-DP20VSL
TABLE OF CONTENTS
1 PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
2 SPECIFIC SERVICE INSTRUCTIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
3 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7
4 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-19
5 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-22
AUDIO/VIDEO CONTROL RECEIVER
RX-DP20V
STANDBY/ON
STANDBY
PHONES
DIMMER
CC CONVERTER
DOOR
UP
DOOR
DOWN
MASTER VOLUME
S-VIDEODIGITAL VIDEO LÑAUDIOÑR
VIDEO
CHANNEL
TV/VIDEO
MUTING
DVD
DVD
TV/DBS
VCR 1
AUDIO
DVD MULTI
CD
CDR
PHONO
TAPE/MD
EXT 7.1CH
ANALOG/DIGITAL
CC CONVERTER
EFFECT
LIVENESS
SOUND
TEST
THX
EX/ES/7.1
ANALOG DIRECT
SLEEP DIMMER
FM MODE
DSP SURR/DSPSURROUND
RETURN 100+
OFF
INPUT
SET
SETUP
MENU
ADJUST
MENU
DVD
MENU EXIT
TEXT
DISPLAY
123
456
7
/P
89
10
+
100
TV VOL
VOLUME
PTY SEARCH
STOP PAUSE
TA/NEWS/INFODISPLAYMODE
LIGHT
FF/
/ REW
REC
PLAY
PTY PTY
RM-SRXDP20R
REMOTE CONTROL
A/V CONTROL RECEIVER
VCR 1 VCR 2
FM/AMVIDEOTV/DBS
TRANSMIT
LEARN
LEARN
TV
CATV/
DBS
Area Suffix
B ------------------------------ U.K.
E ---------- Continental Europe
EN ----------- Northern Europe
EV ------------- Eastern Europe

1-2 (No.22019)
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.
130 W per channel, min. RMS, driven into 8 Ωat 1 kHz, with no more than 0.8%
total harmonic distortion. (IEC 268-3/DIN)
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
PHONO IN (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 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:-21 dBm to -15 dBm
Signal-to-Noise Ratio
('66 IHF/'78 IHF)
(Analog Direct On)
PHONO IN (MC):60 dB/72 dB (at REC OUT)
PHONO IN (MM):72 dB/80 dB (at REC OUT)
CD IN, CDR IN, TAPE/MD IN, EXT 7.1CH IN:92 dB/80 dB
:92 dB/80 dBDVD IN, VCR 1 IN, VCR 2 IN, TV SOUND/DBS IN, VIDEO
Frequency Response
(8 Ω)PHONO IN (MC) :20 Hz to 20 kHz (±1 dB)
PHONO IN (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, MONITOR 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
Tuning Range 87.5 MHz to 108.0 MHz
Usable Sensitivity Monaural:17.0 dBf (1.95 µV/75 Ω)
50 dB Quieting Sensitivity Monaural:21.3 dBf (3.2 µV/75 Ω)
Stereo:41.3 dBf (31.5 µV/75 Ω)
Signal-to-Noise Ratio
(IHF-A weighted) Monaural:78 dB at 85 dBf
Stereo:73 dB at 85 dBf

(No.22019)1-3
Designs & specifications are subject to change without notice.
Total Harmonic Distortion Monaural:0.4% at 1 kHz
Stereo:0.6% at 1 kHz
StereoSeparationat REC
OUT 35 dB at 1 kHz
Alternate Channel Selec-
tivity 60 dB (±400 kHz)
Frequency Response 30 Hz to 15 kHz (+0.5 dB, -3 dB)
AM (MW/LW) tuner
Tuning Range MW:522 kHz to 1 629 kHz
LW:144 kHz to 288 kHz
Usable Sensitivity Loop antenna: 400 µV/m
Signal-to-Noise Ratio 50 dB (100 mV/m) General
Power Requirements AC 230V~, 50 Hz
Power Consumption 600 W/690 VA (at operation), 2.7 watts (in standby mode)
Dimensions (W ×H ×D) 445 mm ×177 mm ×475 mm
Mass 24 kg

1-4 (No.22019)
SECTION 1
PRECAUTION
1.1 Safety Precautions
(1) This design of this product contains special hardware and
many circuits and components specially for safety purpos-
es. For continued protection, no changes should be made
to the original design unless authorized in writing by the
manufacturer. Replacement parts must be identical to
those used in the original circuits. Services should be per-
formed by qualified personnel only.
(2) Alterations of the design or circuitry of the product should
not be made. Any design alterations of the product should
not be made. Any design alterations or additions will void
the manufacturers warranty and will further relieve the
manufacture of responsibility for personal injury or property
damage resulting therefrom.
(3) Many electrical and mechanical parts in the products have
special safety-related characteristics. These characteris-
tics are often not evident from visual inspection nor can the
protection afforded by them necessarily be obtained by us-
ing replacement components rated for higher voltage, watt-
age, etc. Replacement parts which have these special
safety characteristics are identified in the Parts List of Ser-
vice Manual. Electrical components having such features
are identified by shading on the schematics and by ( ) on
the Parts List in the Service Manual. The use of a substitute
replacement which does not have the same safety charac-
teristics as the recommended replacement parts shown in
the Parts List of Service Manual may create shock, fire, or
other hazards.
(4) The leads in the products are routed and dressed with ties,
clamps, tubings, barriers and the like to be separated from
live parts, high temperature parts, moving parts and/or
sharp edges for the prevention of electric shock and fire
hazard. When service is required, the original lead routing
and dress should be observed, and it should be confirmed
that they have been returned to normal, after reassem-
bling.
(5) Leakage shock hazard testing
After reassembling the product, always perform an isola-
tion check on the exposed metal parts of the product (an-
tenna terminals, knobs, metal cabinet, screw heads,
headphone jack, control shafts, etc.) to be sure the product
is safe to operate without danger of electrical shock.Do not
use a line isolation transformer during this check.
• Plug the AC line cord directly into the AC outlet. Using a
"Leakage Current Tester", measure the leakage current
from each exposed metal parts of the cabinet, particular-
ly any exposed metal part having a return path to the
chassis, to a known good earth ground. Any leakage cur-
rent must not exceed 0.5mA AC (r.m.s.).
• Alternate check method
Plug the AC line cord directly into the AC outlet. Use an
AC voltmeter having, 1,000Ωper volt or more sensitivity
in the following manner. Connect a 1,500Ω10W resistor
paralleled by a 0.15µF AC-type capacitor between an ex-
posed metal part and a known good earth ground.
Measure the AC voltage across the resistor with the AC
voltmeter.
Move the resistor connection to each exposed metal
part, particularly any exposed metal part having a return
path to the chassis, and measure the AC voltage across
the resistor. Now, reverse the plug in the AC outlet and
repeat each measurement. Voltage measured any must
not exceed 0.75 V AC (r.m.s.). This corresponds to 0.5
mA AC (r.m.s.).
1.2 Warning
(1) This equipment has been designed and manufactured to
meet international safety standards.
(2) It is the legal responsibility of the repairer to ensure that
these safety standards are maintained.
(3) Repairs must be made in accordance with the relevant
safety standards.
(4) It is essential that safety critical components are replaced
by approved parts.
(5) If mains voltage selector is provided, check setting for local
voltage.
1.3 Caution
Burrs formed during molding may be left over on some parts
of the chassis.
Therefore, pay attention to such burrs in the case of pre-
forming repair of this system.
1.4 Critical parts for safety
In regard with component parts appearing on the silk-screen
printed side (parts side) of the PWB diagrams, the parts that are
printed over with black such as the resistor ( ), diode ( )
and ICP ( ) or identified by the " " mark nearby are critical
for safety. When replacing them, be sure to use the parts of the
same type and rating as specified by the manufacturer.
(This regulation dose not Except the J and C version)
Good earth ground
Place this
probe on
each exposed
metal part.
AC VOLTMETER
(Having 1000
ohms/volts,
or more sensitivity)
1500 10W
0.15 F AC TYPE

(No.22019)1-5
1.5 Safety Precautions (U.K only)
(1) This design of this product contains special hardware and many circuits and components specially for safety purposes. For con-
tinued protection, no changes should be made to the original design unless authorized in writing by the manufacturer. Replace-
ment parts must be identical to those used in the original circuits.
(2) Any unauthorised design alterations or additions will void the manufacturer's guarantee; furthermore the manufacturer cannot
accept responsibility for personal injury or property damage resulting therefrom.
(3) Essential safety critical components are identified by ( ) on the Parts List and by shading on the schematics, and must never
be replaced by parts other than those listed in the manual. Please note however that many electrical and mechanical parts in
the product have special safety related characteristics. These characteristics are often not evident from visual inspection. Parts
other than specified by the manufacturer may not have the same safety characteristics as the recommended replacement parts
shown in the Parts List of the Service Manual and 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 re-assembling.
1.5.1 Warning
(1) Service should be performed by qualified personnel only.
(2) This equipment has been designed and manufactured to meet international safety standards.
(3) It is the legal responsibility of the repairer to ensure that these safety standards are maintained.
(4) Repairs must be made in accordance with the relevant safety standards.
(5) It is essential that safety critical components are replaced by approved parts.
(6) If mains voltage selector is provided, check setting for local voltage.
Burrs formed during molding may be left over on some parts of the chassis. Therefore,
pay attention to such burrs in the case of preforming repair of this system.

1-6 (No.22019)
SECTION 2
SPECIFIC SERVICE INSTRUCTIONS
This service manual does not describe SPECIFIC SERVICE INSTRUCTIONS.

(No.22019)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
arrow 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
assembly.
(4) Remove the four screws Dattaching the front panel
assembly on bottom of the body. Detach the front panel
assembly 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 in board (see 2-3.Front panel assembly
section/ fig.2).
3.1.3 Removing the V compo 2 board & 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 card wire from the connector CN1 on the
tuner unit.
Remove the two screws E'' attaching the tuner unit to the
rear panel.
(3) Disconnect the harness from the connector CN301 on the
compu link board.
Remove the two 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.
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
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.22019)
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 thirty-eight screws E& E' & E'' & E''' & E''''
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.4
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 on the audio signal 1 board.
(5) Remove the three plastic rivet.
Fig.5
Fig.6
E
F
E''' E
FF F
F
Rear panel
Red
Black
EE E''
E''''E'
E
E
F
Solder part
AC inlet
CN963
CN981
CN971
CN977
CN983
CN964
CN985
System control board
Plastic rivet
Plastic rivet
CN324
CN25
CN234
CN224
CN45
(on power
supply 2
board)
Power/ fuse
board
Audio signal 1 board
Audio signal 2 board
CN203
Tie band
Tie band

(No.22019)1-9
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
connector CN633, CN643 and CN635 on the DSP board.
(4) Removing the screw Gattaching the shield cover and
remove the shield cover.
Fig.7
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, CN207 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
Shield cover
Top view
CN631
CN635
CN643
Plastic rivet
DSP board
G
CN203
CN633
Audio signal
1 board
Audio signal 1 board
CN234
Plastic rivet
CN224
CN204
CN202
CN205
CN221
CN206
CN223
CN207

1-10 (No.22019)
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
input 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
Video board
V compo 1 board
Audio signal 2 board S video board
CN324
Input base board FRONT
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
CN8
CN9
FRON
T

(No.22019)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
signal 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 CN 743 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) Remove the six screws Iattaching the power supply 1
board.
Fig.13
CN743
CN742
CN741
Speaker board
Input base board
Power supply
1 board
H
HCN44
(on the power
supply 2 board)
CN62
CN2
CN1
CN11
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.22019)
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 PW82 and PW81(B ver.) /
PW83(E/EN ver.) on the power trans board.
(3) Remove the four screws Lattaching the power transformer
2.
Fig.15
Fig.16
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
Thermal SW
1 board
K
Power supply 2 board
CN47 CN46
J
Power
transformer 1
Power amp. board
CN701
FRONT
L
PW83(E/EN ver.)
PW82
Power trans
board
Power
transformer 2
PW81(B ver.)
L
Power supply 3 board
CN41
M
Power
transformer 3

(No.22019)1-13
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
transformer 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 O fixing the head phone board.
(3) Removing the screw Pattaching the lug wire and bracket.
Fig.19
Fig.20
PW21 (blue)
PW22 (brown)
PW23 (red)
PW24 (white)
N
N
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.22019)
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.
assembly.
(3) Pull up the power amp. assembly.
Fig.21
R(Rear side)

(No.22019)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 Aattaching 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
A
bottom 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.22019)
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.
Fig.4
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
(bottom side).
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.22019)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.
Fig.3
Front panel assembly
Nut
Volume knob
Operation switch panel
Door
FL display board
B
B
CN982
CN973 A
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

1-18 (No.22019)
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.4
Door input board
G
Door

(No.22019)1-19
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)

1-20 (No.22019)
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)
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