JVC RX-8030VBK User manual

SERVICE MANUAL
COPYRIGHT © 2003 VICTOR COMPANY OF JAPAN, LIMITED No.MB103
2003/12
AUDIO/VIDEO CONTROL RECEIVER
MB103200311 RX-8030VBK
TABLE OF CONTENTS
1 PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
2 SPECIFIC SERVICE INSTRUCTIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
3 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5
4 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-13
5 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-14
MASTER VOLUME
PUSH OPEN
SUBWOOFER OUT ON/OFF
SPEAKERS ON/OFF
PHONES
1
STANDBY
RX-8030V AUDIO/VIDEO CONTROL RECEIVER
CC CONVERTER
ANALOG DIRECT
2
STANDBY/ON
TV SOUND
/DBS
VIDEOVCR 2VCR 1
DVDDVD MULTI AMFMTAPE/MDCDRCDPHONO
SETTING ADJUST
QUICK SPEAKER
SETUP EXIT
SURROUND
DSP
SURROUND/ DSP
OFF
231
564
89
7/P
0+10
A/V CONTROL RECEIVER
10/0
Area Suffix
UJ --------------------- U.S.Military

1-2 (No.MB103)
SPECIFICATION
Designs & specifications are subject to change without notice.
Amplifier
Output Power
At Stereo operation Front ch 100 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 Front ch 100 W per channel, min. RMS, driven into 8 Ωat 1 kHz, with no more than 0.8% total harmonic
distortion.
Center ch 100 W, min. RMS, driven into 8 Ωat 1 kHz, with no more than 0.8% total harmonic distortion.
Surround ch 100 W per channel, min. RMS, driven into 8 Ωat 1 kHz, with no more than 0.8% total harmonic
distortion.
Surround Back ch 100 W, min. RMS, driven into 8 Ωat 1 kHz, with no more than 0.8% total harmonic distortion.
Audio
Audio Input Sensitivity/
Impedance (1 kHz) PHONO IN (MM) : 2.5 mV/47 kΩ
DVD IN, VCR 1 IN, VCR 2 IN, TV SOUND/DBS IN, VIDEO IN : 200 mV/47 kΩ
CD IN, CDR IN, TAPE/MD IN : 200 mV/47 kΩ
Audio Input (DIGITAL IN)* Coaxial DIGITAL 1 (DVD) : 0.5 V(p-p)/75 Ω
Optical DIGITAL 2 (CD), DIGITAL 3 (TV), DIGITAL 4 (CDR) : -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 PRE OUT : 1 V
Recording Output Level VCR 1 OUT, VCR 2 OUT, CDR OUT, TAPE/MD OUT : 200 mV
Digital output Optical : DIGITAL OUTPUT
Signal wave length : 660 nm
Output level : -21 dBm to -15 dBm
Signal-to-Noise Ratio
('66 IHF/DIN) PHONO IN : 70 dB/66 dB
DVD IN, VCR 1 IN, VCR 2 IN, TV SOUND/DBS IN, VIDEO : 87 dB/67 dB
CD IN, CDR IN, TAPE/MD IN : 87 dB/67 dB
Frequency Response (8 Ω) PHONO IN : 20 Hz to 20 kHz (±1 dB)
DVD IN, VCR 1 IN, VCR 2 IN, TV SOUND/DBS IN, VIDEO : 20 Hz to 100 kHz (+1 dB, -3 dB)
CD IN, CDR IN, TAPE/MD IN : 20 Hz to 100 kHz (+1 dB, -3 dB)
RIAA Phono Equalization ±1 dB (20 Hz to 20 kHz)
Equalization (5 bands) 63 Hz, 250 Hz, 1 kHz, 4 kHz, 16 kHz (±8 dB)
Bass boost +6 dB ±1 dB at 100 Hz
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)/75 Ω
(C: chrominance, burst) : 0.286 V(p-p)/75 Ω
Component video : DVD IN, DBS 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)/75 Ω
(C: chrominance, burst) : 0.286 V(p-p)/75 Ω
Component video (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 FM tuner (IHF)
Tuning Range 87.50 MHz to 108.00 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 531 kHz to 1 602 kHz (at 9 kHz intervals)
530 kHz to 1 600 kHz (at 10 kHz intervals)
General
Power Requirements AC 110 V/127 V/220 V/230 V - 240 V , adjustable with the voltage selector, 50 Hz/60 Hz
Power Consumption 250 W (at operation)
4.5 W (in standby mode)
Dimensions (W ×H ×D) 435 mm ×157 mm ×425 mm
Mass 12.3 kg

(No.MB103)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.MB103)
SECTION 2
SPECIFIC SERVICE INSTRUCTIONS
This service manual does not describe SPECIFIC SERVICE INSTRUCTIONS.

(No.MB103)1-5
SECTION 3
DISASSEMBLY
3.1 Removing the top cover
(See Fig.1)
(1) From the both sides of the main body, remove the four
screws Aattaching the top cover.
(2) From the back side of the main body, remove the three
screws Battaching the top cover.
(3) Remove the top cover in the direction of the arrow 2 while
extending the lower sections of the top cover in the direc-
tion of the arrow 1.
Fig.1
3.2 Removing the rear panel
(See Fig.2)
• Prior to performing the following procedures, 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.
(2) Remove the thirty-six screws C, two screws Dand three
screws Eattaching the rear panel.
Fig.2
3.3 Removing the I/O board
(See Fig.3)
• Prior to performing the following procedures, remove the top
cover and rear panel.
(1) From the top side of the main body, remove the two plastic
rivets in the direction of the arrow 1.and remove the stop-
per boards in the direction of the arrow 2.
(2) Remove the tie bands bundling the wires.
(3) Disconnect the wire from the connector CN722 on the cen-
ter board.
(4) Disconnect the wire from the connector CN714 on the front
board (L).
(5) Disconnect the wire from the connector CN717 on the sur-
round back board.
(6) Disconnect the wire from the connector CN719 on the front
board (R).
(7) Disconnect the wire from the connector CN723 on the main
board.
(8) Disconnect the I/O board from the connectors CN205,
CN361, CN381 and CN501 in an upward direction.
Fig.3
Top cover
A
2
1
1
B
A
E
Strain relief
E
Rear panel
C
E
C
CD C
C
1
2
2
CN381
CN205
CN501
Plastic rivet
Plastic
rivet
Stopper
board
Stopper board
Tie
band
Center board
Tie
bands
Front board(L)Surround back board
Front
board(R)
CN719
CN717 CN714
CN722
CN723
Main
board
I/O board
1
CN361

1-6 (No.MB103)
3.4 Removing the front panel assembly
(See Figs.4 and 5)
• Prior to performing the following procedures, remove the top
cover, rear panel and I/O board.
(1) From the top side of the main body, remove the tie bands
bundling the wires. (See Fig.4)
(2) Disconnect the wire from the connector CN599 on the DSP
board. (See Fig.4)
(3) Disconnect the wire from the connector CN415 on the
Audio2 board. (See Fig.4)
(4) Disconnect the wire from the connector CN206 on the Vid-
eo board. (See Fig.4)
(5) Disconnect the wire from the connector CN244 on the S-
Video board. (See Fig.4)
(6) Disconnect the card wire from connector CN402 on the
power supply board. (See Fig.4)
(7) Disconnect the card wire from connector CN400 on the mi-
con board. (See Fig.4)
(8) Remove the tie band and wire protection board fixing the
card wire. (See Fig.4)
(9) Remove the three screws Fand screw Gattachingthefront
panel assembly. (See Fig.4)
REFERENCE :
When attaching the screw G, attach the earth wire with it.
(10) From the bottom side of the main body, remove the four
screws Hattaching the front panel assembly. (See Fig.5)
(11) Remove the front panel assembly in the direction of the ar-
row. (See Fig.5)
Fig.4
Fig.5
FFF
G
Front panel assembly Earth wire
CN402
Power
supply
board
Tie
band
Tie
band
Micon
board
CN244
S-Video boardVideo board
CN206CN415
Audio2 board
CN599
DSP
board
CN400
Tie
band
Card
wire
Tie
band
Wire
protection
board
HH
Front panel assembly

(No.MB103)1-7
3.5 Removing the tuner, DSP board, Audio board, Audio2 board, Video board and S-Video board
(See Fig.6)
• Prior to performing the following procedures, remove the top
cover, rear panel and I/O board.
(1) From the top side of the main body, remove the tie band
bundling the wire.
(2) Disconnect the card wire from connector CN314 on the Au-
dio board, and take out the tuner.
(3) Disconnect the wire from the connector CN599 on the DSP
board.
(4) Disconnect the DSP board from the connector CN601 on
the micon board, and take out the DSP board.
(5) Disconnect the Audio board from the connectors (CN101,
CN303) on the micon board, and take out the Audio board.
(6) Disconnect the wire from the connector CN415 on the
Audio2 board.
(7) Disconnect the Audio2 board from the connector CN301 on
the micon board, and take out the Audio2 board.
(8) Disconnect the wire from the connector CN206 on the Vid-
eo board.
(9) Disconnect the Video board from the connector CN201 on
the micon board, and take out the Video board.
(10) Disconnect the wire from the connector CN244 on the S-
Video board.
(11) Disconnect the S-Video board from the connector CN241
on the micon board, and take out the S-Video board.
Fig.6
3.6 Removing the micon board
(See Fig.7)
• Prior to performing the following procedures, remove the top
cover, rear panel, I/O board, tuner, DSP board, Audio board,
Audio2 board, Video board and S-Video board.
(1) From the top side of the main body, disconnect the card
wire from the connector CN400 on the micon board.
(2) Disconnect the relay board from the connector CN81 on
the micon board.
(3) Disconnect the parallel wire from the connectors CN931
and CN932 on the micon board.
(4) Disconnect the parallel wire from the connector CN831 on
the main board.
(5) Remove the three screws Jattaching the micon board.
REFERENCE :
When attaching the screw J, attach the earth wire with it.
(6) Remove the three screws Kattaching the transistors
(Q921, Q931, Q941) to the chassis base.
(7) Loosen the screw Lattaching the micon board.
Fig.7
CN314
Tuner
Audio board
Card wire
CN601
DSP
board
CN303
Tie
band
CN101
Video board
S-video board
CN206 CN244
Micon board
CN415
A
udio2 board
CN599
CN301
CN201 CN241
CN400
Micon
board
Relay
board
CN81
Card
wire
CN931 CN932
J
J
J
K
Transistors
(Q921,Q931,Q941)
Chassis base
L
CN831 Main board
Earth wire

1-8 (No.MB103)
3.7 Removing the speaker board
(See Fig.8)
• Prior to performing the following procedures, remove the top
cover, rear panel.
(1) From the top side of the main body, remove the tie band
bundling the wires.
(2) Disconnect the wires from the connectors (CN813, CN814)
on the main board.
(3) Disconnect the parallel wire from the connectors (CN931,
CN932) on the micon board.
(4) Remove the screw Jattaching the micon board.
REFERENCE :
When attaching the screw J, attach the earth wire with it.
(5) Take out the speaker board in the direction of the arrow.
Fig.8
3.8 Removing the main board
(See Fig.9)
• Prior to performing the following procedures, remove the top
cover.
(1) From the top side of the main body, remove the tie bands
bundling the card wire and wires.
(2) Remove the tie band and wire protection board bundling
the card wire.
(3) Disconnect the wire from the connector CN811 on the pow-
er transformer board 1.
(4) Disconnect the relay board from the connector (CN71,
CN81) on the power supply board and micon board.
(5) Disconnect the parallel wire from the connectors (CN831,
CN881) on the main board.
(6) Disconnect the wire from the connectors (CN723, CN813,
CN814) on the main board.
(7) Disconnect the wire from the connector CN722 on the cen-
ter board.
(8) Disconnect the wire from the connector CN714 on the front
board (L).
(9) Disconnect the wire from the connector CN717 on the sur-
round back board.
(10) Disconnect the wire from the connector CN719 on the front
board (R).
(11) Remove the screw L, six screws Mand two screws Nat-
taching the main board.
(12) Take out the main board. Fig.9
Tie band
CN813
Main board
Speaker board
CN814
CN931 CN932
Micon board
J
Earth wire
Tie band
Wire
protection
board
Micon
board
Card wire
Tie bands
CN811
Power
transformer
board 1
CN71
CN81
Relay board
Power
supply
board
CN831
CN881
Main
board
Tie
band
CN723
CN814
CN813
Center board
CN722
Front board(L)
CN714
Surround back board
CN717
Front board(R)
CN719
L
N
N
M
M
M
Tie band

(No.MB103)1-9
3.9 Removing the heat sink
(See Figs.10 and 11)
• Prior to performing the following procedures, remove the top
cover and main board.
(1) From the reverse side of the main board, remove the two
screws Pattaching the main board to the heat sink. (See
Fig.10)
(2) Disconnect the connector (CN701 to CN706) on the main
board, remove the main board. (See Fig.10)
(3) Remove the twelve screws Qattaching the heat sink. (See
Fig.11)
3.10 Removing the center board, front boards (L/R),
surround boards (L/R) and surround back board
(See Figs.10 and 12)
• Prior to performing the following procedures, remove the top
cover and main board.
(1) From the reverse side of the main board, remove the two
screws Pattaching the main board to the heat sink. (See
Fig.10)
(2) Disconnect the connectors (CN701 to CN706) on the main
board, remove the main board. (See Fig.10)
(3) Remove the two screws Qattaching the center board. (See
Fig.12)
(4) Remove the two screws Qattaching the front board (L).
(See Fig.12)
(5) emove the two screws Qattaching the surround back
board. (See Fig.12)
(6) Remove the two screws Qattaching the front board (R).
(See Fig.12)
(7) Remove the two screws Qattaching the surround board
(L). (See Fig.12)
(8) Remove the two screws Qattaching the surround board
(R). (See Fig.12)
Fig.10
Fig.11
Fig.12
Heat sink Main board
CN703 CN701 CN704 CN702 CN705 CN706
PP
Heat sink Q
Q
Surround board(R)
Q Q Q Q Q Q
Surround board(L)
Front board(R)
Surround back board
Front board(L)
Center board

1-10 (No.MB103)
3.11 Removing the voltage selector board
(See Figs.13 and 14)
• Prior to performing the following procedures, remove the top
cover.
(1) From the back side of the main body, remove the two
screws Rattaching the voltage board. (See Fig.13)
(2) Remove the solders from the soldered sections aon the
power transformer board 2 and remove the wires of the
voltage selector board. (See Fig.14)
(3) Take out the voltage selector board. Fig.13
Fig.14
3.12 Removing the power transformer
(See Fig.15)
• Prior to performing the following procedures, remove the top
cover.
(1) From the top side of the main body, remove the tie band
bundling the wires.
(2) Disconnect the wire from the connectors (CN55, CN811)
on the power transformer board 1.
(3) Remove the solders from the soldered sections bon the
power transformer board 2.
(4) Remove the four screws Sattaching the power transform-
er.
3.13 Removing the power/fuse board
(See Fig.15)
• Prior to performing the following procedures, remove the top
cover.
(1) From the back side and top side of the main body, remove
the tie band from the bundling the wires and the power
cord.
(2) Remove the screws Tand screw Uattaching the power/
fuse board.
(3) Remove the solders from the soldered sections cattaching
the power cord.
(4) From the reverse side of the power/fuse board, remove the
solders from the soldered sections dattaching the wires.
Fig.15
R
Power
transformer
board 2
Soldered sections a Voltage selector board
Tie bands
Tie band
Tie band
Tie band
CN811 CN55
Power
transformer
board 1
Power
transformer
board 2
Soldered
sections b
SS
Power
transformer
T
U
Power/fuse board
Soldered
sections c
Power cord
Soldered sections d

(No.MB103)1-11
3.14 Removing the power supply board
(See Fig.16)
• Prior to performing the following procedures, remove the top
cover.
(1) From the top side of the main body, disconnect the parallel
wire from the connector CN55 on the power transformer
board 1.
(2) Disconnect the card wire from the connector CN402 on the
power supply board.
(3) Disconnect the relay board from the connector CN71 on
the power supply board.
(4) Remove the three screws Vattaching the power supply
board.
(5) Remove the power supply board from the hook eof the
chassis base bracket in the direction of the arrow, and take
out the power supply board.
(6) Turn over the power supply board, and remove the solders
from the soldered sections fattaching the wire.
3.15 Removing the headphone jack board
(See Figs.16 and 17)
• Prior to performing the following procedures, remove the top
cover, rear panel, I/O board and front panel assembly.
(1) From the top side of the main body, disconnect the parallel
wire from the connector CN881 on the main board. (See
Fig.16)
(2) From the front side of the main body, remove the nut and
screw Wattaching the headphone bracket to the front
bracket. (See Fig.17)
(3) Remove the three screws Vattaching the power supply
board. (See Fig.16)
(4) Take out the headphone jack board from the inside of the
chassis base while lifting the power supply board.
Fig.16
Fig.17
3.16 Removing the switch board
(See Fig.18)
• Prior to performing the following procedures, remove the top
cover, rear panel, I/O board and front panel assembly.
(1) From the back side of the front panel assembly, remove the
two screws Xattaching the switch board.
(2) Take out the switch board, disconnect the wire from the
connector CN432 on the switch board.
3.17 Removing the power switch board
(See Fig.18)
• Prior to performing the following procedures, remove the top
cover, rear panel, I/O board and front panel assembly.
(1) From the back side of the front panel assembly, remove the
two screws Yattaching the power switch board.
(2) Take out the power switch board, disconnect the wire from
the connector CN430 on the power switch board.
Fig.18
CN55
Power
transforme
r
board 1
Hook f
V
Relay board
Tie band
CN402
Card wirePower supply board
CN71
V
V
Soldered
sections f
Headphone
jack
board
CN881
Main board
Nut
Headphone jack board
Headphone bracket Front bracket
W
CN432 X
X
Switch board
Front panel assembly CN430
Power switch board
Front video board
Y

1-12 (No.MB103)
3.18 Removing the front key & system control board, front video board
(See Figs.19 to 22)
• Prior to performing the following procedures, remove the top
cover, rear panel, I/O board, front panel assembly, switch
board and power switch board.
(1) From the front side of the front panel assembly, pull out the
volume and jog knobs, and remove the nut attaching the
front key & system control board. (See Fig.19)
(2) From the back side of the front panel assembly, remove the
eight screws Zattaching the sub panel assembly. (See
Fig.20)
(3) Remove the wires of the front video board from the hook g
of the front panel assembly in the direction of the arrow 1.
(See Fig.20)
(4) Remove the sub panel assembly while releasing the claws
hin the direction of the arrow 2. (See Fig.20 and 21)
(5) From the front side of the front panel assembly, disconnect
the wire from the connector CN412 on the front key & sys-
tem control board, and take out the front video board. (See
Fig.22)
(6) Remove the claws iattaching the front key & system con-
trol board in the direction of the arrow and take out the front
key & system control board. (See Fig.22)
Fig.19
Fig.20
Fig.21
Fig.22
Volume knob
Nut
Front panel assembly
Jog knob
Z
Z
Claw hClaw hClaw h
Hook g
Front panel assembly
Sub panel assembly
Front video board
2
2
1
2
2
Claw h
Sub panel assembly Front panel assembly
Front key & System control board
Front video board
Front panel assembly
Claw iClaw iCN412

(No.MB103)1-13
SECTION 4
ADJUSTMENT
4.1 Adjustment method
Tuner section
1. Tuner range
Power amplifier section
Adjustment of idling current
Attention:
This adjustment does not obtain a correct adjustment value immediately after the amplifier is used (state that an in-
ternal temperature has risen). Please adjust immediately after using the amplifier after turning off the power supply of
the amplifier and falling an internal temperature.
<Adjustment method>
(1) Set the volume control to minimum during this adjustment. (No signal & No load)
(2) Set the surround mode OFF.
(3) Turn VR787 and VR788 fully counterclockwise to warm up before adjustment.
If the heat sink is already warm from previous use the correct adjustment can not be made.
(4) For L-ch, connect a DC voltmeter between B2204 and B2205 (Lch) and, connect it between B2213 and B2214 (Rch).
(5) 30 minutes later after power on, adjust VR787for Lch, or VR788 for Rch so that the DC voltmeter value has 1mV to10mV.
• It is not abnormal though the idling current might not become 0mA even if it is finished to turn variable resistance (VR787,
VR788) in the direction of counterclockwise.
FM 87.5MHz to 108.0MHz
AM 530kHz to 1710kHz
Measurement location B2204-B2205 (Lch), B2213-B2214 (Rch)
Adjustment part VR787 (Lch), VR788 (Rch)
Front board (L)
VR788
Front board (R)
VR787
B2204 B2205
B2213 B2214
VR787 (Lch)
B2204, B2205 (Lch)
VR788 (Rch)
B2213, B2214 (Rch)

1-14 (No.MB103)
SECTION 5
TROUBLESHOOTING
5.1 Self-diagnose function
This model incorporates the following self-diagnostic functions.
1. PROTECTOR
• The PROTECTOR IN port detects errors such as speaker overcurrent and DC voltage output errors (Active: L). Immediately after
detection, all relays are switched off and the alarm display as shown below (blinking at intervals of 0.5 sec. ON and 0.5 sec. OFF)
is displayed in the lower part of the FL matrix.
During the alarm display, all other FL and LED segments are turned off.
OVERLOAD
• The overload status can be canceled by switching the power off. When the power is switched on again, the unit is turned on in
the same abnormal status as before. Lower the volume level for 10 steps for protection. (If the previous volume level was be-
tween 0 and 9, lower it to 0).
• The detection by the protector is not performed for 4 seconds after power on.
2. Supply voltage error detection
• When the power is switched on, the supply voltage at the A/D input port (pins 2 to 5 and 7) is monitored and, when an error is
detected continuously for 1 second, the unit immediately enters the standby mode.
• When the power is switched on again, the unit is turned on in the same abnormal status as before.
• The supply voltage error detection is not performed for 4 seconds after power on.
• The following table shows the error detection thresholds.
At abnormal state (Low voltage) At normal state At abnormal state (High voltage)
Pin 2 Analog value : 0 - 2.2
Digital value : 000 - 1C0 Analog value : 2.2 - 2.8 Digital value : 1C1 - 240 Analog value : 2.8 - 5.0 Digital value : 241 - 3FF
Pin 3 Analog value : 0 - 2.2
Digital value : 000 - 1C0 Analog value : 2.2 - 2.8 Digital value : 1C1 - 240 Analog value : 2.8 - 5.0 Digital value : 241 - 3FF
Pin 4 Analog value : 0 - 2.2
Digital value : 000 - 1C0 Analog value : 2.2 - 2.8 Digital value : 1C1 - 240 Analog value : 2.8 - 5.0 Digital value : 241 - 3FF
Pin 5 Analog value : 0 - 2.2
Digital value : 000 - 1C0 Analog value : 2.2 - 2.8 Digital value : 1C1 - 240 Analog value : 2.8 - 5.0 Digital value : 241 - 3FF
Pin 7 Analog value : 0 - 2.2
Digital value : 000 - 1C0 Analog value : 2.2 - 2.8 Digital value : 1C1 - 240 Analog value : 2.8 - 5.0 Digital value : 241 - 3FF

(No.MB103)1-15

(No.MB103)
AV & MULTIMEDIA COMPANY AUDIO/VIDEO SYSTEMS CATEGORY 10-1,1chome,Ohwatari-machi,Maebashi-city,371-8543,Japan
VICTOR COMPANY OF JAPAN, LIMITED
WPC
Printed in Japan