JVC RX-F31S User manual

SERVICE MANUAL
COPYRIGHT © 2005 Victor Company of Japan, Limited No.MB449
2005/7
HOME CINEMA CONTROL CENTER
MB44920057
RX-F31S
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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
3 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5
4 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-15
5 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-15
Area suffix
A ------------------------ Australia
US ------------------------ Singapore
UF ------------------------------ China
UJ ---------------------- U.S.Military

1-2 (No.MB449)
SPECIFICATION
*1: Measured on AC 110 V, 127 V, 220 V, and 240 V.
*2: 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 100 W*1 per channel, min. RMS, driven into
6 Ωat 1 kHz with no more than 10% total har-
monic distortion.
At surround operation Front channels 100 W*1 per channel, min. RMS, driven into
6 Ωat 1 kHz with no more than 0.8% total
harmonic distortion.
Center channel 100 W*1, min. RMS, driven into 6 Ωat 1 kHz,
with no more than 0.8% total harmonic distor-
tion.
Surround channels 100 W*1 per channel, min. RMS, driven into
6 Ωat 1 kHz with no more than 0.8% total
harmonic distortion.
Surround back channel 100 W*1, min. RMS, driven into 6 Ωat 1 kHz,
with no more than 0.8% total harmonic distor-
tion.
Audio Audio Input Sensitivity
/Impedance
DVR/DVD (DVD MULTI), VCR, DBS, TV 330 mV/47 kΩ
Audio Input
(DIGITAL IN)*2
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)
Audio Output Level DVR, VCR, MONITOR OUT 330 mV
Signal-to-Noise Ratio ('66 IHF/DIN) 80 dB/62 dB
Frequency Response (8 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 Y (luminance): 1 V(p-p)/75 Ω
PB, PR: 0.7 V(p-p)/75 Ω
Video Output Level/
Impedance
Composite video: DVR, VCR, MONITOR OUT 1 V(p-p)/75 Ω
S-video: DVR, VCR, MONITOR OUT Y (luminance): 1 V(p-p)/75 Ω
C (chrominance, burst): 0.286 V(p-p)/75 Ω
Component: MONITOR OUT Y (luminance): 1 V(p-p)/75 Ω
PB, PR: 0.7 V(p-p)/75 Ω
Synchronization Negative
FM tuner (IHF) Tuning Range 87.50 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 OUT(REC) 35 dB at 1 kHz
AM tuner Tuning Range 531 kHz to 1 710 kHz (at 9 kHz intervals)
530 kHz to 1 710 kHz (at 10 kHz intervals)
General Power Requirements AC 110 V/127 V/220 V/230 V - 240 V , adjust-
able with the voltage selector, 50 Hz/60 Hz
Power Consumption 120 W (at operation)
5 W (in standby mode)
Dimensions (W ×H ×D) 435 mm ×70 mm ×317.2 mm
Mass 6.3 kg

(No.MB449)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.MB449)
SECTION 2
SPECIFIC SERVICE INSTRUCTIONS
This service manual does not describe SPECIFIC SERVICE INSTRUCTIONS.

(No.MB449)1-5
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 Battaching the top cover. (See Fig.2)
(3) Remove the top cover in the direction of the arrow. (See
Fig.1.)
Fig.1
Fig.2
A
Top cover
B
B
Top cover B

1-6 (No.MB449)
3.1.2 Removing the front panel assembly
(See Figs.3 and 4)
• Remove the top cover.
(1) From the top side of the main body, remove the tie bands
bundling the wires. (See Fig.3.)
Reference:
After reassembling, bundle the wires with the new tie
bands as before. (See Fig.3.)
(2) Disconnect the parallel wire from the connector CN412 on
the regulator connect board. (See Fig.3)
(3) Disconnect the wire from the connector CN451 on the input
mother board. (See Fig.3)
(4) Remove the four screws Cand screw C' attaching the front
panel assembly. (See Fig.3)
Reference:
When attaching the screw C', attach the earth wires with
it as before. (See Fig.3.)
(5) From the bottom side of the main body, remove the four
screws Cattaching the front panel assembly. (See Fig.4)
(6) From the both and bottom sides of the main body, release
the joints (a, b) and remove the front panel assembly in the
direction of the arrow. (See Figs.3 and 4)
Fig.3
Fig.4
3.1.3 Removing the rear panel
(See Fig.5)
• Remove the top cover.
(1) From the back side of the main body, remove the strain re-
lief from the rear panel in the direction of the arrow and re-
move the power cord.
(2) Remove the twenty-nine screws Dattaching the rear panel.
Fig.5
C C C
Front panel assembly
C'
Regulator connect board
Tie bands Earth wires
CN451
CN412
Input mother board
aa
CC
Front panel assembly
b
Strain relief
D
Rear panel
Power cord
D
D

(No.MB449)1-7
3.1.4 Removing the tuner
(See Fig.6)
• Remove the top cover.
(1) From the top side of the main body, disconnect the card
wire from the connector CN1 on the tuner.
(2) From the back side of the main body, remove the two
screws Eattaching the tuner to the rear panel and take out
the tuner.
3.1.5 Removing the DSP board
(See Fig.6)
• Remove the top cover.
(1) From the back side of the main body, remove the five
screws Eattaching the DSP board to the rear panel.
(2) From the top side of the main body, disconnect the DSP
board from the vol IC board while releasing the claw cof
the connector CN601 on the DSP board.
Note:
When releasing the claw c, take care not to break it.
(3) Take out the DSP board and disconnect the card wire from
the connector CN602 on the forward side of the DSP
board.
Reference:
When attaching the DSP board, align the section dof the
speaker relay board in hole on the DSP board.
Fig.6
3.1.6 Removing the master clock board
(See Fig.7)
• Remove the top cover.
(1) From the top side of the main body, remove the screw F.
Reference:
When attaching the screw F, attach the holder with it as
before.
(2) Disconnect the connector CN771 on the master clock
board from the main amplifier board in an upward direction.
3.1.7 Removing the gate drive-2 board
(See Fig.7)
• Remove the top cover.
From the top side of the main body, disconnect the connector
CN311 on the gate drive-2 board from the main amplifier board
in an upward direction.
3.1.8 Removing the S.S. setup board
(See Fig.7)
• Remove the top cover.
(1) From the top side of the main body, remove the tie band fix-
ing the wire.
Reference:
After reassembling, fix the wire with a new tie band as
before.
(2) Disconnect the wire from the connector CN725 on the S.S.
setup board.
(3) Disconnect the S.S. setup board from the main amplifier
board while releasing the claw eof the connector CN727
on the main amplifier board.
Note:
When releasing the claw e, take care not to break it.
Fig.7
Tuner
CN1 CN601
CN602
DSP board
Speaker relay board
d
Rear panel ERear panel E
CN601
DSP board
Vol IC
board
c
CN771 CN311
CN725
Gate drive-2 board
S.S. setup board
Holder
Main amplifier board
Master clock board
Tie band
F
CN727
Speaker terminal board
S.S. setup
board e

1-8 (No.MB449)
3.1.9 Removing the vol sel board
(See Fig.8)
• Remove the top cover.
(1) Remove the strain relief from the rear panel in the direction
of the arrow.
(2) From the back side of the main body, remove the two
screws Gattaching the vol sel board to the rear panel.
(3) From the top side of the main body, disconnect the wires
from the connectors (CN204, CN205) on the vol sel board.
(4) Take out the vol sel board from the main body and remove
the wires from the soldered sections fon the reverse side
of the vol sel board.
3.1.10 Removing the audio input/output board
(See Fig.8)
• Remove the top cover.
(1) From the back side of the main body, remove the two
screws Gattaching the audio input/output board to the rear
panel.
(2) Disconnect the audio input/output board from the video
connect board while releasing the claw gof the connector
CN516 on the audio input/output board.
Note:
When releasing the claw g, take care not to break it.
(3) Disconnect the card wires from the connectors (CN508,
CN514) on the forward side of the audio input/output
board.
3.1.11 Removing the primary board
(See Fig.8)
• Remove the top cover.
(1) From the top side of the main body, disconnect the power
cord from the connector CN203 on the primary board.
(2) Disconnect the wires from the connector CN218 on the pri-
mary board.
(3) Remove the six screws Hattaching the primary board on
the chassis base assembly.
(4) Take out the primary board from the main body and remove
the wires from the soldered sections hon the reverse side
of the primary board.
Fig.8
3.1.12 Removing the power transformer
(See Fig.9)
• Remove the top cover.
(1) From the top side of the main body, remove the tie bands
bundling the wires.
Reference:
After reassembling, bundle the wires with the new tie
bands as before.
(2) Disconnect the wires from the connectors (CN201, CN702)
on the main amplifier board.
(3) Disconnect the wire from the connector CN202 on the pri-
mary board.
(4) Remove the four screws Jattaching the power transformer
on the chassis base assembly.
Fig.9
Primary board
Vol sel board
CN203
Power cord
Stain relief
H
H
CN218
CN508
CN205
CN204 Audio input/output
board
CN514
Chassis base assembly
H
h
f
Video
connect
board
CN516
Audio input/output
board
g
Strain relief Rear panel
G G
J
J
J
Power transformer
CN201 CN702
Tie bands
Chassis base assembly
Main amplifier board
Vol sel board
CN204
CN205

(No.MB449)1-9
3.1.13 Removing the fan motor
(See Fig.10)
• Remove the top cover.
(1) Form the top side of the main body, remove the tie bands
bundling the wires.
Reference:
After reassembling, bundle the wires with the new tie
bands as before.
(2) Disconnect the wire from the connector CN552 on the input
mother board.
(3) Remove the two screws Kattaching the fan motor assem-
bly on the chassis base assembly.
(4) Take out the fan motor assembly from the main body.
(5) Remove the two screws Mattaching the fan motor on the
fan holder.
Fig.10
3.1.14 Removing the gate drive-1 board
(See Fig.11)
• Remove the top cover and DSP board.
From the top side of the main body, disconnect the connectors
(CN811, CN911) on the gate drive-1 board from the main ampli-
fier board in an upward direction.
3.1.15 Removing the speaker relay board
(See Fig.11)
• Remove the top cover and DSP board.
(1) From the top side of the main body, disconnect the parallel
wire from the connector CN301 on the speaker relay board.
(2) Disconnect the speaker relay board from the main amplifier
board while releasing the claw jof the connector CN392 on
the main amplifier board.
Note:
When releasing the claw j, take care not to break it.
3.1.16 Removing the vol IC board
(See Fig.11)
• Remove the top cover and DSP board.
(1) From the top side of the main body, disconnect the card
wire from the connector CN518 on the vol IC board.
(2) Disconnect the vol IC board from the main amplifier board
while releasing the claw kof the connector CN501 on the
input mother board.
Note:
When releasing the claw k, take care not to break it.
(3) Disconnect the connector CN512 on the vol IC board from
the main amplifier board in an upward direction. Fig.11
Tie bands
Input mother board Fan motor assembly
K
Chassis base assembly
K
CN552
M
Fan holder
Fan motor
Speaker relay board
Speaker
terminal board
CN811
CN512
CN911
CN518
CN301
Gate drive-1 board
Vol IC board
Speaker
terminal board
CN501
Input mother board
Vol IC
board k
CN319
Speaker
relay board
j
Main amplifier board

1-10 (No.MB449)
3.1.17 Removing the speaker terminal board
(See Fig.12)
• Remove the top cover, DSP board, S.S. setup board and
speaker relay board.
(1) Disconnect the wire from the connector CN751 on the
speaker terminal board.
(2) Disconnect the parallel wires from the connectors (CN701,
CN801) on the speaker terminal board.
(3) From the back side of the main body, remove the two
screws Nattaching the speaker terminal board to the rear
panel and take out the speaker terminal board from the
main body.
Fig.12
3.1.18 Removing the video connect board
(See Fig.13)
• Remove the top cover and audio input/output board.
Disconnect the video connect board from the input mother board
while releasing the claw mof the connector CN506 on the input
mother board.
Note:
When releasing the claw m, take care not to break it.
Fig.13
Speaker
terminal board
CN701 CN801
CN751
M
Rear panel
Video connect board
Input mother board
Input mother board CN506
Video connect board m

(No.MB449)1-11
3.1.19 Removing the input mother board
(See Fig.14)
• Remove the top cover, rear panel, tuner, DSP board, vol sel
board, audio input/output board, vol IC board and video con-
nect board.
(1) Remove the tie band fixing the wire.
Reference:
After reassembling, fix the wire with the new tie band as
before.
(2) Disconnect the wire from the connector CN725 on the S.S.
setup board.
(3) Disconnect the wire from the connector CN751 on the
speaker terminal board.
(4) Disconnect the parallel wire from the connector CN509 on
the input mother board.
(5) Disconnect the wires from the connectors (CN451, CN530,
CN540, CN552) on the input mother board.
(6) Remove the three screws Pand take out the input mother
board.
Fig.14
P
P
CN751
CN509 CN725
CN451
CN540
CN530 CN552
Input mother board
P
Speaker terminal board
S.S. setup board
Tie band

1-12 (No.MB449)
3.1.20 Removing the main amplifier board
(See Figs.15 and 16)
• Remove the top cover, tuner, DSP board, master clock board,
gate drive-2 board, S.S. setup board, gate drive-1 board and
vol IC board.
(1) Remove the tie bands bundling the wires. (See Fig.15.)
Reference:
• After reassembling, bundle the wires with the new tie
bands as before. (See Fig.15.)
• After reassembling, fix the support board with the new
tie bands as before. (See Fig.15.)
(2) Disconnect the parallel wires from the connectors (CN701,
CN801) on the speaker terminal board. (See Fig.15.)
(3) Disconnect the parallel wire from the connector CN301 on
the speaker relay board. (See Fig.15.)
(4) Disconnect the parallel wire from the connector CN509 on
the input mother board. (See Fig.15.)
(5) Disconnect the wires from the connectors (CN530, CN540)
on the input mother board. (See Fig.15.)
(6) Disconnect the wire from the connector CN218 on the pri-
mary board. (See Fig.15.)
(7) Disconnect the parallel wire from the connector CN412 on
the regulator connect board. (See Fig.16.)
(8) Disconnect the parallel wire from the connector CN216 on
the headphone board. (See Fig.16.)
(9) Disconnect the wires from the connectors (CN201, CN702)
on the main amplifier board. (See Fig.16.)
(10) Remove the four screws Qand three screws Rand take
out the main amplifier board with the regulator and regula-
tor connect boards from the main body. (See Fig.16.)
Fig.15
Fig.16
Input mother board
Support board
Primary board
Speaker terminal board
Speaker relay board
CN801
CN701
CN301
CN218 CN509
CN530
CN540
Tie bands Tie bands Tie bands
Tie bands
CN201 CN412
CN702
Main amplifier board
R R
R
Q
Regulator connect board
Q
CN216
Headphone board

(No.MB449)1-13
3.1.21 Removing the regulator connect board
(See Fig.17)
• Remove the top cover, tuner, DSP board, master clock board,
gate drive-2 board, S.S. setup board, gate drive-1 board, vol IC
board and main amplifier board.
(1) From the forward side of the main amplifier board, discon-
nect the parallel wire from the connector CN705 on the reg-
ulator board.
(2) Disconnect the regulator connect board from the main am-
plifier board while releasing the claws (n, p) of the connec-
tors (CN703, CN704) on the main amplifier board.
Note:
When releasing the claws (n, p), take care not to break them.
Fig.17
3.1.22 Removing the regulator board
(See Fig.18)
• Remove the top cover, tuner, DSP board, master clock board,
gate drive-2 board, S.S. setup board, gate drive-1 board, vol IC
board, main amplifier board and regulator connect board.
(1) From the forward side of the main amplifier board, remove
the tie band fixing the wire.
Reference:
After reassembling, fix the wire with a new tie band as
before.
(2) From the front side of the main amplifier board, remove the
two screws Sattaching the TR bracket to the heat sink.
Fig.18
3.1.23 Removing the regulator connect board
(See Fig.19)
• Remove the top cover, tuner, DSP board, master clock board,
gate drive-2 board, S.S. setup board, gate drive-1 board, vol IC
board, main amplifier board, regulator connect board and reg-
ulator board.
(1) From the back side of the main amplifier board, remove the
four screws Tattaching the FET bracket to the heat sink.
(2) Remove the cooling rubbers on the heat sink from the FET
bracket and remove the heat sink from the main amplifier
board in the direction of the arrow.
Fig.19
CN705 Regulator board
Main amplifier board
Regulator connect board
CN704 CN703
Main amplifier board Main amplifier board
Regulator
connect board
Regulator
connect board
pn
TR bracket
Heat sink
Tie band
Regulator board
S
S
FET bracket
Heat sink
Cooling rubbers
Main amplifier board
TT
Cooling rubber

1-14 (No.MB449)
3.2 Front panel assembly section
• Remove the front panel assembly.
(See "3.1.2 Removing the front panel assembly".)
3.2.1 Removing the volume & JOG board
(See Figs.1 and 2)
(1) From the inside of the front panel assembly, remove the
four screws Aand screw A' attaching the volume & JOG
board. (See Fig.1.)
Reference:
When attaching the screw A', attach the earth bracket
with it as before. (See Fig.1.)
(2) Take out the volume & JOG board while lifting it from the
front panel assembly little by little.
Reference:
The master volume knob and source selector knob are
removed from the front side simultaneously. (See Fig.2.)
(3) From the forward side of the volume & JOG board, discon-
nect the wire from the connector CN413. (See Fig.1)
3.2.2 Removing the headphone board
(See Fig.1)
(1) From the inside of the front panel assembly, remove the
screw Aattaching the support board.
(2) Take out the headphone board from the front panel assem-
bly.
3.2.3 Removing the FL board
(See Fig.1)
• Remove the volume & JOG board and headphone board.
(1) Remove the four screws Aand take out the FL board form
the front panel assembly.
(2) From the forward side of the FL board, disconnect the wires
from the connectors (CN414, CN415).
Fig.1
Fig.2
3.2.4 Removing the key & LED board
(See Fig.3)
• Remove the volume & JOG board, headphone board and FL
board.
(1) From the seven screws Aattaching the key & LED board.
(2) Take out the key & LED board from the front panel assem-
bly.
Fig.3
A A
A'
AA
CN414
CN415
FL board Support board
Earth bracket Headphone board
Volume & JOG board Front panel assembly
A
Front panel assembly
Source selector knob
Master volume knob
A
A
Front panel assembly
Key & LED board A

(No.MB449)1-15
SECTION 4
ADJUSTMENT
This service manual does not describe ADJUSTMENT.
SECTION 5
TROUBLESHOOTING
This service manual does not describe TROUBLESHOOTING.

(No.MB449)
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

SCHEMATIC DIAGRAMS
No.MB449SCH
2005/7
RX-F31S
Contents
Block diagram
Standard schematic diagrams
Printed circuit boards
2-1
2-2
2-13 to 16
CD-ROM No.SML200507
COPYRIGHT 2005 Victor Company of Japan, Limited.
HOME CINEMA CONTROL CENTER
Area suffix
A ------------------------ Australia
US ------------------------ Singapore
UF ------------------------------ China
UJ ---------------------- U.S.Military
Lead free solder used in the board (material : Sn-Ag-Cu, melting point : 219 Centigrade)

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.

2-1
Block diagram
Main
plug
CN203
T202
Trans.
CN218
RY201
Primary section
Power
trans.
CN201 CN702CN208
VCR IN
VCR/DVD IN
MONITOR OUT
IC452
PB SEL.
PB OUT
PB
IC451
Y SEL.
Y OUT
Y
IC453
PR SEL.
PR OUT
PR
VCONT1
Audio/Video signal input/output
(Component/DVD multi) section
CN205
FW721
CN711
Q702
+12V REG.
IC502
6CH
SW
CN525
SMART SETUP L/R
SMART SETUP C
SMART SETUP SL/SR
SMART SETUP SB
CN521
C_RELAY
S_RELAY
F_RELAY
SB_RELAY
CN540 CN530CN509
5.1ch
MULTI
IN
CN508
DBS_L/R
TV_L/R
CN602
IC667
8CH
CODEC
DSP_IN_L
DSP_IN_R
IC671
CPU
DSPSTATUS
DSPREADY
DSPRESET
DSPCOMMAND
DSPCLK
MOSI,MISO
SS,HREQ
DSP_RST
IC673
INV
SCKMICK
IC661
DSP
IC601,IC602
AMP.
LIN+/-
RIN+/-
IC611 to IC613
IC615,IC621,IC622
IC632 to IC634,IC651
AMP.
C_LRCK,S_LRCK
C_BCK,S_BCK
D/A0 to D/A3
DATA,MCK,XTAL
A1+/- to A4+/-
B1+/- to B3+/-
DSP and digital signal input terminal section
J681 UN682
RX1
RX0
DIGITAL
IN1
DIGITAL
IN2
CDIN,CDOUT
CCLK,D_CS
D_RST,INT
DSP_L,DSP_R
DSP_LS,DSP_RS
DSP_C,DSP_LFE
DSP_SB
GPIO1,GPIO2
GPIO3,GPIO4
UN683
RX2
DIGITAL
IN3
CN601
CN511
IC503
6CH
VOLUME
IN.L
IN.R
SBWFR OUT
MUTE
DSP_L/R,DSP_C,DSP_LFE
DSP_SL/SR,DSP_SB,IN.L,IN.R
SOURCE_MUTE
CN512
DA,CL
CN611
Vol. control section
CN501 CN502
CN522
FL,FR
SL,SR
C,SB
IC301,IC801
IC901
FM MODULATOR
CN321
CN311
IC311
IC312
AMP
PWM_L/R
FB1_L/R
FB2_L/R
FL
FR
FW301
CN921
CN911
PWM_SL/SR
FB1_SL/SR
FB2_SL/SR
CN821
CN811
C
IC811
IC812
AMP
IC911
IC912
AMP
PWM_C
PWM_SB
FB1_C,FB2_C
FB1_SB
FB2_SB
FW801
Q1301 to Q1304
FRONT Lch/Rch
Q1901 to Q1904
CENTERch
SURROUND BACKch
Q1801 to Q1804
SURROUND Lch/Rch
SL
SR
IC702,IC704,IC706
Master clock GEN.
Master clock section
AMP_CLK
CLK_F_CONT
CN771 CN781
D201
to
D204
9.4V
POWER
D208
to
D211
S2
+S2B
Q207,Q208
-7V/+7V REG.
+7V
-7V
+S2B
-S2B
+S2B
Q209
+5V REG.
+S2B
Q213
A+5V REG.
A+5V
+S2B
Q210
TU+9V REG.
TU+9V
D231
D233
D234
Q205
-VPP REG.
-VPP
F1,F2 S3
D701
to
D704
+B S1
+B
+12V
CN704 CN703 CN714 CN713
FW715
CN705
+S2B
Q226
VIDEO+5V
REG.
Q227
VIDEO+9V
REG.
Q211,Q212
D+5V REG.
Regulator 2 section
+S2B,9.4V
VIDEO+7V
D+5V,A+5V,9.0V
IC851 to IC855
Q851 to Q858
SW CONT.
AC_ON/OFF
B_SW1,B_SW2
POWER_PWM
AMP_CLK,+12V
SW control section
CN412
F1,F2
-VPP,5.0V
CN518
CN451
IC401
CPU
&
FL DRV.
JOG1
JOG2
VOL1
VOL2
CN403 CN413
JS401
JS402 D412 to D415
BLUE LED
JOG/VOL.
JOG1,JOG2
VOL1,VOL2
BLUE_LED
DI401
FL
DISPLAY
Q403,Q411
DIMMER
CONT.
LED_DIMMER1
LED_DIMMER2
MCLK,M_CS
M_COMMAND
M_STATUS
M_BUSY
M_RESET
STANDBY_IND
BLUE_LED
KEY_IN1 to 3
CN415 CN405
CN414 CN404
TUNER_IND,TV_IND
DVD_MULTI_IND
VCR_G_IND,VCR_R_IND
VIDEO_G_IND,VIDEO_R_IND
DVD_G_IND,DVD_R_IND
D421 to D426
INDICATOR
IC402
IR DETECTOR
REMOCON
D408,D409
BLUE LED
D407
STANDBY LED
BLUE_LED
STANDBY_IND
S401 to S406
SW
KEY_IN1
KEY_IN2
KEY_IN3
FW402
F1,F2
-VPP,5.0V
SEG1 to 35
GRID1 to 13
BLUE_LED
FW226
RY211
CN216
HEADPHONE
OUT
CN301
RY301
RY901
CN302 CN312
SPEAKER
TERMINAL
FL,FR,C
CN801
RY801
RY902
SL,SR
SB
CN727
CN728
IC371
IC871
IC971
SMART
SURROUND
SETUP
CN725
CN751
C_RELAY
F_RELAY
S_RELAY
SB_RELAY
CN520
FL,FR,C
SL,SR
SB
Regulator, PWM modulator, digital power amplifier
and low pass filter section
CN510FW201
5.0V
Q203
+5V/B+5V
REG.
+5V
B+5V
AC_ON/OFF
B_SW1
B_SW2
AMP_CLK
IC701
AMP
POWER_PWM
Q703,Q704
AMP+B/AMP-B
REG.
AMP+B
AMP-B
AMP_CLK
CLK_F_CONT
AMP_CLK
User control keys, system control and FL display section
Speaker terminal and smart surround setup section
J6521 J4503
J7501
J7001
Q722 to Q726
-B+12V REG.
+S2B
-B+12V
+B +12V
CN701
FW792
+S2B,-S2B
+S2B
-S2B
HP_SW
HP_RELAY
IC504
AMP
J504
SUBWOOFER
OUT
SBWFR OUT
J6522
MULTI_SL/SR
MULTI_C
MULTI_SW
IC351
Y/C
SEPA.
CV
IC352
AMP
& SEL
Y
IC353
AMP
& SEL
C
CN514 CN516
REC_SY
REC_SC
SY
SC
IC362
SEL
REC_SY
CV
IC360
OSD
IC356
IC357
AMP
& SEL
OSD_SY
OSD_SC
IC359
CLOCK
GEN.
CKIN
VCONT10
VCONT10
VCONT8VCONT9
1270_SDA
1270_SCL
OSD_SIN
OSD_SCLK
OSD_CS
CN536
CN526
CN506CN504
Y/C IN
CV IN/OUT
J6511
REC_SY/SC
Y/C IN
CV IN/OUT
J6512
Y/C IN
CV IN/OUT
J6513
IC551
IC552
Y/C SEL
C
SY
Y
SC
IC553
Y/C
MIX
IC554
AMP
& SEL
IC555
SEL
CV_IN
CV_OUT
CV
M_OUT_CV
VCONT1
VCONT4
VCONT5
SY
SC
VCONT1
VCONT4
DVR IN/OUT
J6501
DVR_L/R
DVR_RECL/RECR
VCR IN/OUT
J6502
VCR_RECL/RECR
VCR_L/R
DBS/TV IN
MONITOR OUT
J6503
MOUT_L/R
L,R
IC501
CPU
TO
TUNER
CN505
MUTE
TU_DATAI,TU_DATAO
TU_CLK,TU_CE,TU_MUTE
TU_MUTE
TH1,TH2,LIMITTER
DA_PROTECTOR
CLK_F_CONT
REG_SAFETY,POWER
HP_RELAY,HP_SW
B_SW1,B_SW2
VIDEO+9V
VIDEO+5V
B+5V,A+5V
D+5V,+5V
TU+9V
+7V,-7V
+S2B
BLUE_LED
LED_DIMMER1
LED_DIMMER2
AV_LINK,M_CLK
M_COMMAND
M_STATUS,M_CS
M_BUSY,M_RESET
J505
TO
FAN
MOTOR
Q532
Q533
Q536
FAN
FAN_L
IC507
EEPROM
RC_SDA
RC_SCL
System control and audio/Video signal input/output section
CN401
CN552
AV_COMPULINK
AV_LINK
IC508
AUDIO
SOUND
CPU
SBOUT
Q202
9.0V REG.
+S2B
+S2B
9.4V
UN686
TX
DIGITAL
OUT
SB
9.0V
CN204
VS201
VOL. SEL.
S2
DSP_STATUS
DSP_READY
DSP_RESET
DSP_COMMAND
DSP_CLK
TH1,TH2
LIMITTER
DA_PROTECTOR
CLK_F_CONT
REG_SAFETY
POWER
HP_RELAY
HP_SW
B_SW1
B_SW2
TU_L/R
HP_SW

2-2
SHEET 1
Parts are safety assurance parts.
When replacing those parts make
sure to use the specified one.
VERSION CODES
PROTECT
TH1
TH2
-7V
-B
AMP_CLK
B_SW2
B_SW2
CLK_F_CONT
THCOM
AC_ON/OFF
AMP-B
+S2B
+7V
HP_SW
POWER_PWM
HP_SW
PROTECT
CLK_F_CONT
TH1
B_SW1
HP_RELAY
-B+12V
HP_RELAY
AMP+B
B_SW1
THCOM
TH2
C717 0.0022/50
R707
3.3k
1/4W
THCOM
1A3G
D201
!
47/25
C742
100/16
C744
D716
FMB-G19L
!
10
R236
FR !
100k
R239
220/50
C241
TH302
QAD0146-103
4700/25
C210
100/16
C226
C711
1/50
4.7
TH201
!
F202
!
T2AL
UNF R728
10 1W
F203
!
T2AL
3.3k
R237
UNF
!
1A3G
D231
!
C705
0.22/100
1A3G
D211
!
6
3
5
2
8
1
7
4
Q701
KTC1027/OY/
!
HP_SW
-B
D717
MA111
KRC111S
Q224
47k
R228
1A3G
D210
!
0.0047/50
C743
0.0047
C201 !
EP202
QNZ0136-001Z
R719
39k
KTC3203/OY
Q203
KTA1046/Y
Q725
!
100/16
C222
R720
47k
2SC2812N/6
Q726
C719 0.1/100
220/63
C203
C716 0.0022/50
1A3G D222
CN201
QGA3901C1-09
1 2 3 4 5 6 7 8 9
KRC105S
Q201
10
R225
FR
!
0.0047/100
C202
3.3M
R243 !
5.6k R754
2
1
1A3G
D213
CN520
1 2 3 4 5 6 7 8 9
10
MTZJ5.6C
D220
-7V
220u
L701
CN510
1 2 3 4 5 6 7 8 9
10 11
1000/25
C211
470/16
C206
C703
0.1/160
C736
0.0022/50
1A3G
D204
!
+7V
2SD2394/EF/
Q209
!
22k
R219
KRC111S
Q221
47K
R756
MTZJ10B
D218
5.6k
R211
UNF
!
PW202
820R206
!
UNF
8.2
R217
FR
!
EP701
QNZ0136-001Z
C712
100/25
PW201
D712 1SS133
1A3G
D208
!
T202
!
-B+12V
HP_RELAY
R716
10
UNF
1W
0.047MY
C213
AMP+B
C728 0.0022/50
UNF R724
4.7
C714
0.33/50
D715
FMB-G19L
!
12
R207
UNF
!
1A3G
D209
!
R714
33
47/50
C215
6
3
5
2
8
1
7
4
Q703
2SK3599
!
D
G
S
KTC3199/GL
Q723
6
3
5
2
8
1
7
4
MTZJ16BD726
1SS133
D724
2SD2394/EF/
Q210
!
TH1
0.22u
C217
!
100/16C745
L703
QQL77AK-220
22u
3.3k
R222
UNF
!
KTA1046/Y
Q207
!
D720
MA111
MTZJ6.2C
D217
CLK_F_CONT
1A3G
D202
!
C737 0.0022/50
+S2B
UNF R727
4.7
1/4W
D719
1SS133
Q219
KRC102S
C702
6800/68
C704
0.47/100
MTZJ6.2B
D722
L702
QQL77AK-220
22u
RY201
!
PROTECT
10
R215
FR
!
2.2
R253
UNF
!
R729
10 1W
220
R751
10
R210
FR
!
2.2k
R242
680
R760
R717 10 1W
Q218
KRA102S
KRA102S
Q214
KRC111S
Q222
6.8KR755
C701
6800/68
1.2K
R752
R715
33
KTC3200/GL/
Q204
4.7k
R753
C729
0.0022/50
R718
1k
R705 100k
100/50C741
C718
0.1/100
R706 100k
C734
0.0022/50
1000/25
C224
D703
!
C722
3300/50
1A3G
D203
!
F204
!
T100mAL
MTZJ10C
D723
D704
!
KTA1046/Y
Q722
!
CN203
QGA7901C1-02
2
1
KTA1046/Y
Q205
!
2SD2394/EF/
Q213
!
MTZJ6.2C
D224
C723
3300/50
1A3G
D212
100k
R208
KTC3199/GL
Q724
C720
0.47/50
UNFR712
6.8k
!
1/2W
0.1MY
C208
6
3
5
2
8
1
7
4
C721 0.47/50
Q705
R726
1k
10
R209
!
UNF
39k
R227
KRC102S
Q215
CN208
1
2
3
4
100/100
C242
D706
1SS133
1k
R223
470
R757
AMP-B
AMP_CLK
D711
UDZS13B
D701
30PRA20-FC
!
MTZJ27B
D223
1 R759
!
UNF
D234
1A3G
!
FW201
1 2 3 4
C740
NI
C243
100/100
MTZJ7.5C
D216
100k
R224
F205
!
T3.15AL
100/16
C223
CN703
QGB2510J1-10
1
2
3
4
5
6
7
8
9
10
1k
R226
UNF
!
1SS133
D205
0.047MY
C212
0.1MY
C209
47k
R220
2.2
R245
UNF
!
MTZJ6.2C
D207
0.0047
C205
330
R761
1A3G
D233
!
10
R254
UNF
!
UDZS7.5B
D215
C713
0.1/50
R721 1k
1k
R238
FR R711
10
!
1.5k
R218
UNF
!
470
R758
2SD2394/EF/
Q208
!
ERA18-04
D721
C735
0.0022/50
IC701 IRS2011S
5
HIN
6
LIN
7
COM
8
LO
4
Vs
3
HO
2
VB
1
Vcc
1SS133
D725
P.GND
100/16
C221
0.1MY
C207
10
R221
FR
!
D702
!
Q704
2SK3599
!
D
G
S
CN702
QGA3901C1-03
1
2
3
CN704
QGB2510J1-14
1
2
3
4
5
6
7
8
9
10
11
12
13
14
EP201
QNZ0136-001Z
CN218
QGA2501C1-04
4
3
2
1
KRC111S
Q220
1.5k
R216
UNF
!
J :U.S.A.
C :CANADA
EN:NORDIC COUNTRIES
E :CONTINENTAL EUROPE
B :U.K.
EV:EAST EUROPEAN COUNTRIES
UP:KOREA
UJ:U.S. ARMY
US:SINGAPORE
UT:TAIWAN
A :AUSTRARIA
UF:CHINA
UX:SAUDI ARABIA
D.GND
C739 1/16
1/50
C214
C751
1/100
C752
1/100
W701
C753 0.22/100
C754
0.47/100
C755
1/50
C757 1/50
C756 1/50
C758 1/50
GND
FW721
1 2 3 4 5
OMFR274
1.2K 2W
!
OMFR273
1.2K 2W
!
OMFR272
1.2K 2W
!
OMFR271
1.2K 2W
!
FR
R723
10
!
UNF
R713
6.8k
1/2W
!
Q702
2SD2394/EF/
!
D718
MA111
D714
UDZS13B
C727
10/50 C715
100/16
CN711
QGA2001C1-05
1 2 3 4 5
C218
0.001/250
!
C219
0.001/250
!
FW792
1 2 3 4 5
PW212
1
2
3
PW211
CN204
1
2
3
1 2 3 4 5 6 7 8 9
1
2
3
4
1
2
3
CN205
1
2
3
4
F201
T1.6AL
!
QSW0812-001
VS201
!
!
!
6
3
5
2
8
1
7
4
LVA10564-1
D.GND
TU+9V
P.GND
D701-D704
7.0V
(1/4W)
-19.8V
+S2B
(100V)
SURROUND OFF
(1/4W)
3.5V
AC14.8V
(1/4W)
(1/4W)
-26.1V
(1/4W)
QSK0142-001
AC 0V
-B
16.6V
(1/2W)
QQT0281-006
3.7V
-51.0V
3.6V
4.9V
VOLUME 0
(1/4W)
-18.9V
(1/4W)
-7.6V
5.1V
(1/4W)
(1/4W)
9.0V
4.9V B+5V
3.6V
-VPP
AMP_CLK
+7V TV DIRECT
9.8V
-19.1V
+B
5.0V
16.5V
!
!
S2
VIDEO+5V
-19.1V
POWER
D.GND
S3
5.7V
+5V
+5V
7.0V
17.3V
3.6V
-18.9V
-25.8V
110V
0V
D+5V
5.6V
-7.0V
NEUTRAL/
S1
3.5V
(1/4W)
AC14.8V
-7.1V
8.5V
(1/4W)
VIDEO+9V
6.3V
+S2B
F2
4.3V
AC 44.1V
VOLTAGE MEASUREMENT CONDITION
4.4V
16.4V
5.0V
(1/2W)
VIDEO+5V
S2
COM
LVA10566-4
230-240V
127V
4.4V
(100V)
BRN
7.6V
(1/4W)
(100V)
4.5V
-B+12V
REG SAFTY
SOURCE FM(NO SIGNAL)
TUNER +9V
(1/4W)
-B+12V REGULATOR
LIVE/
9.8V
-7V
4.3V
6.3V
5.6V
+12V
POWER ON
TV DIRECT
BLU
A+5V
(1/4W)
A+5V
(1/4W)
3.6V
4.4V
0V
4.4V
COM
9.7V
4.5V
AC 44.1V
220V
17.2V
(1/4W)
(1/4W)
5.0V
REG_SAFETY
VIDEO+9V
S3
D+5V
VOLTAGE SELECTOR LOCATION
D.GND
S1
F1
-39.4V
4.5V
4.5V
13.4V
0V
2.3V
-59.5V
0.6V
32.0V
0V
17.5V
0V
5.1V
4.9V
8.7V
4.2V
3.6V
9.4V
9.0V
-25.8V
-19.3V
-19.4V
0V
5.0V
0V
9.7V
4.5V
0V
0V
16.7V
5.2V
5.8V
5.8V
-24.8V
0V0V
4.4V
32.0V 0V 0V 59.8V 13.5V
59.5V
12.9V
13.5V
-47.3V 0V
-46.8V
-47.4V
44.3V
33.3V
32.0V
-59.3V
-60.1V
-58.0V
31.1V2.3V
33.6V
0V-21.0V
-0.3V
-2.0V
-27.5V
-28.0V
0V
-27.5V
-21.1V-22.9V
-21.7V-22.4V
-22.2V
TO CN711 OF LVA10566-4 (SHEET 1)
FROM FW721 OF LVA10564-1 (SHEET 1)
17.2V 0V -19.8V 5.1V 0.6V
8.9V
0V
4.8V
0V
5.1V 5.1V 1.6V
0V
4.7V 4.7V
0V 0V
TO CN530 OF LVA10576-1 (SHEET 7)TO CN540 OF LVB10576-1 (SHEET 7)
FROM CN509 OF LVA10576-1 (SHEET 7)
TO CN713 OF LVA10566-3 (SHEET 5) TO CN714 OF LVA10566-3 (SHEET 5)
TO CN701 OF LVA10564-2 (SHEET 4)
!
TRANSFORMER
0V
TH.FUSE
POWER
127V
LVA10566-7
17V
110V
0V
127V
TH.FUSE
TRANSFORMER
TH.FUSE
POWER
TH.FUSE
MAINS
PLUG
(SHEET 3)
(SHEET 3)
(SHEET 3)
(SHEET 2), (SHEET 3)
(SHEET 2)
Standard schematic diagrams
Primary and regulator section