Yamaha RX-V681 User manual

SERVICE MANUAL
■CONTENTS
TO SERVICE PERSONNEL........................................... 2
FRONT PANELS ............................................................ 3
REAR PANELS .............................................................. 4
REMOTE CONTROL PANEL....................................... 10
SPECIFICATIONS........................................................ 11
INTERNAL VIEW ......................................................... 15
SERVICE PRECAUTIONS........................................... 16
DISASSEMBLY PROCEDURES.................................. 17
UPDATING FIRMWARE............................................... 27
SELF-DIAGNOSTIC FUNCTION ................................. 30
POWER AMPLIFIER ADJUSTMENT .......................... 72
DISPLAY DATA ............................................................ 73
IC DATA ........................................................................ 75
BLOCK DIAGRAMS .................................................... 83
WIRING DIAGRAM ...................................................... 87
PRINTED CIRCUIT BOARDS...................................... 88
PIN CONNECTION DIAGRAMS................................ 110
SCHEMATIC DIAGRAMS .......................................... 111
REPLACEMENT PARTS LIST................................... 127
REMOTE CONTROL.................................................. 156
FIRMWARE UPDATING PROCEDURE..................... 158
101367
'16.05
AV RECEIVER
RX-V681/RX-A760
RX-V681/RX-A760
Note:
When the DIGITAL P.C.B. or IC82 on DIGITAL (1) P.C.B. is replaced, this unit will display “Internal Error”and will not
operate properly. The model name MUST be written to the backup IC (EEPROM: IC82 on DIGITAL (1) P.C.B.) to
have proper operation. (For detailed procedure, refer to related Service News or Service Bulletin. Or contact your
local Yamaha representative.)

2
RX-V681/RX-A760
RX-V681/RX-A760
■TO SERVICE PERSONNEL
1. Critical Components Information
Components having special characteristics are marked ⚠and
must be replaced with parts having specifications equal to
those originally installed.
2. Leakage Current Measurement (For 120V Models Only)
When service has been completed, it is imperative to verify
that all exposed conductive surfaces are properly insulated
from supply circuits.
• Meterimpedanceshouldbeequivalentto1500ohmsshunted
by0.15μF.
WALL
OUTLET
EQUIPMENT
UNDER TEST
AC LEAKAGE
TESTER OR
EQUIVALENT
INSULATING
TABLE
• Leakagecurrentmustnotexceed0.5mA.
• BesuretotestforleakagewiththeACpluginbothpolarities.
For U model
“CAUTION”
“F3701: FOR CONTINUED PROTECTION AGAINST RISK OF FIRE, REPLACE ONLY WITH SAME TYPE 2A,
250VFUSE.”
“F3702: FOR CONTINUED PROTECTION AGAINST RISK OF FIRE, REPLACE ONLY WITH SAME TYPE 8A,
125VFUSE.”
For C model
CAUTION
F3701:REPLACEWITHSAMETYPE2A,250VFUSE.
F3702:REPLACEWITHSAMETYPE8A,125VFUSE.
ATTENTION
F3701:UTILISERUNFUSIBLEDERECHANGEDEMÉMETYPEDE2A,250V.
F3702:UTILISERUNFUSIBLEDERECHANGEDEMÉMETYPEDE8A,125V.
CALIFORNIA PROPOSITION 65 WARNING
This product contains chemicals known to the State of California to cause cancer, or birth defects or other reproductive
harm.
DO NOT PLACE SOLDER, ELECTRICAL/ELECTRONIC OR PLASTIC COMPONENTS IN YOUR MOUTH FOR ANY REASON
WHATSOEVER!
Avoid prolonged, unprotected contact between solder and your skin! When soldering, do not inhale solder fumes or ex-
pose eyes to solder/flux vapor!
If you come in contact with solder or components located inside the enclosure of this product, wash your hands before
handling food.
About lead free solder
All of the P.C.B.s installed in this unit and solder joints are soldered using the lead free solder.
Among some types of lead free solder currently available, it is recommended to use one of the following types for the re-
pair work.
•Sn + Ag + Cu (tin + silver + copper)
•Sn + Cu (tin + copper)
•Sn + Zn + Bi (tin + zinc + bismuth)
Caution:
As the melting point temperature of the lead free solder is about 30°C to 40°C (50°F to 70°F) higher than that of the
lead solder, be sure to use a soldering iron suitable to each solder.

3
RX-V681/RX-A760
RX-V681/RX-A760
■FRONT PANELS
RX-V681
RX-A760

4
RX-V681/RX-A760
RX-V681/RX-A760
■REAR PANELS
RX-V681 (U, C models)
RX-V681 (R model)
RX-V681 (S model)

5
RX-V681/RX-A760
RX-V681/RX-A760
RX-V681 (T model)
RX-V681 (A model)
RX-V681 (B, G models)

6
RX-V681/RX-A760
RX-V681/RX-A760
RX-V681 (F model)
RX-V681 (L model)
RX-V681 (H model)

7
RX-V681/RX-A760
RX-V681/RX-A760
RX-V681 (V model)
RX-A760 (U, C models)
RX-A760 (R model)

8
RX-V681/RX-A760
RX-V681/RX-A760
RX-A760 (T model)
RX-A760 (A model)
RX-A760 (G, F models)

9
RX-V681/RX-A760
RX-V681/RX-A760
RX-A760 (L model)

10
RX-V681/RX-A760
RX-V681/RX-A760
■REMOTE CONTROL PANEL
RAV537
Remote control sheet
(T model)

11
RX-V681/RX-A760
RX-V681/RX-A760
Total Harmonic Distortion
(20 Hz to 20 kHz, 10 V)
PHONO (MM) to FRONT SP OUT................................ 0.02 % or less
(20Hzto20kHz,50W/8ohms)
AV5etc.(PUREDIRECT)toFRONTSPOUT .............. 0.06 % or less
Signal to Noise Ratio (IHF-A Network)
(Inputshorted,35mV)
PHONO (MM) to FRONT SP OUT................................ 96 dB or more
(Input 1 k-ohm shorted)
AV5etc.(PUREDIRECT)toSPOUT ......................... 110 dB or more
Residual Noise (IHF-A Network)
FRONT L/R to SP OUT................................................. 150μVorless
Channel Separation (1 kHz / 10 kHz)
PHONO (Input shorted) ..................... 60dBormore/55dBormore
AV5etc.(Input1k-ohmshorted)
........................................................ 70dBormore/50dBormore
Volume Control/Step
(Main Zone) ....................... MUTE/-80dBto+16.5dB/0.5dBstep
(Zone 2) .............................MUTE/-80dBto+10.0dB/0.5dBstep
Tone Control Characteristics
Bass
Boost/Cut .......................................... ±6dB/0.5dBstep,at50Hz
Turnover frequency ...............................................................350Hz
Treble
Boost/Cut ........................................ ±6dB/0.5dBstep,at20kHz
Turnover frequency ..............................................................3.5kHz
Filter Characteristics
FRONT, CENTER, SURROUND, SURROUND BACK small (H.P.F.)
......................fc=40/60/80/90/100/110/120/160/200 Hz, 12 dB/oct.
SUBWOOFER small (L.P.F.)
......................fc=40/60/80/90/100/110/120/160/200 Hz, 24 dB/oct.
Optical Jack, Coaxial Jack Support Frequencies
.................................................................................32 kHz to 96 kHz
■Video Section
Video Signal Type
..........................................................................NTSC / PAL / SECAM
Composite Video Signal Level
................................................................................ 1Vp-p/75ohms
Component Video Signal Level
Y.............................................................................. 1Vp-p/75ohms
Pb/Pr .................................................................... 0.7Vp-p/75ohms
Video Maximum Input Level
.................................................................................1.5Vp-pormore
Video Signal to Noise Ratio
..................................................................................... 50dBormore
Monitor Out Frequency Response
Component video signal level ........................ 5Hzto60MHz,-3dB
■SPECIFICATIONS
■Audio Section
Rated Output Power (Power Amp. Section)
(1 kHz, 0.9 % THD)
– 1 channel driven –
U, C, R, T, A, B, G, F, L, V, S, H models (8 ohms)
FRONT L/R ..................................................................125W/ch
CENTER............................................................................125W
SURROUND L/R ..........................................................125W/ch
SURROUND BACK L/R ...............................................125W/ch
G, F, L models (4 ohms)
FRONT L/R ..................................................................150W/ch
– 2 channels driven simultaneously –
U, C models (8 ohms)
FRONT L/R ........................................................ 105W+105W
CENTER............................................................................105W
SURROUND L/R ................................................ 105W+105W
SURROUND BACK L/R ..................................... 105W+105W
(20 Hz to 20 kHz, 0.06 % THD)
– 2 channels driven simultaneously –
U, C, R, T, A, B, G, F, L, V, S, H models (8 ohms)
FRONT L/R ............................................................ 90 W + 90 W
Maximum Effective Output Power (JEITA)
[U, C, R, T, A, B, G, F, L, V, S, H models]
(1 channel driven, 1 kHz, 10 % THD, 6 ohms)
FRONT L/R...........................................................................130 W/ch
CENTER....................................................................................130 W
SURROUND L/R ..................................................................130 W/ch
SURROUND BACK L/R .......................................................130 W/ch
(1 channel driven, 1 kHz, 10 % THD, 8 ohms)
FRONT L/R...........................................................................150W/ch
CENTER....................................................................................150W
SURROUND L/R ..................................................................150W/ch
SURROUND BACK L/R .......................................................150W/ch
Dynamic Power Per Channel (IHF)
FRONT L/R (1 channel driven)
(8 / 6 / 4 / 2 ohms).......................................125/165/190/235W
Damping Factor (20 Hz to 20 kHz, 8 ohms)
FRONT L/R to SPEAKER-A ..............................................100 or more
Input Sensitivity/Input Impedance (1 kHz, 100 W/8 ohms)
AV5etc. .............................................................. 200 mV / 47 k-ohms
Maximum Input Signal (1kHz,0.5%THD)
AV5etc.(EFFECTON)................................................................2.3 V
Output Level/Output Impedance
SUBWOOFER (2 ch stereo and FRONT SP: small)
............................................................................... 1 V / 1.2 k-ohms
ZONE2 OUT....................................................... 470 mV / 1.2 k-ohms
Headphone Impedance
.................................................................................16 ohms or more
Frequency Response (10 Hz to 100 kHz)
AV5etc.,FRONT................................................................... 0 / -3 dB
RIAA Equalization Deviation
PHONO (MM) .................................................................... 0±0.5dB

12
RX-V681/RX-A760
RX-V681/RX-A760
■FM Section
Tuning Range
U, C models...........................................................87.5to107.9MHz
R, L, V, S, H models ...................87.5to108.0/87.50to108.00MHz
T, A, B, G, F models...........................................87.50to108.00MHz
50 dB Quieting Sensitivity (IHF) (1 kHz, 100 % MOD.)
Mono...........................................................................3μV(20.8dBf)
Signal to Noise Ratio (IHF)
Mono......................................................................................... 69 dB
Stereo ....................................................................................... 67 dB
Harmonic Distortion (1 kHz)
Mono..........................................................................................0.5%
Stereo ........................................................................................0.6 %
Antenna Input
.......................................................................... 75ohmsunbalanced
■AM Section
Tuning Range
U, C models.............................................................530to1,710kHz
R, L, V, S, H models ..........................530to1,710/531to1,611kHz
T, A, B, G, F models.................................................531to1,611kHz
Antenna
......................................................................................Loop antenna
■General
Power Supply
U, C models..............................................................AC 120 V, 60 Hz
R, V, S models............................... AC110–120/220–240V,50/60Hz
T model.....................................................................AC220V,50Hz
A model .................................................................... AC240V,50Hz
B, G, F models..........................................................AC230V,50Hz
L, H models ................................................. AC220–240V,50/60Hz
Power Consumption
U, C models..............................................................................400 W
R, T, L, V, S, H models...............................................................270 W
A, B, G, F models .....................................................................300 W
Standby Power Consumption (reference data)
HDMI control: OFF / Standby through: OFF
................................................................................................0.1 W
HDMI control: ON / Standby through: ON
INPUT: HDMI1 (HDMI no signal)
.............................................................................................0.4 W
HDMI control: ON / Standby through: AUTO
HDMI no signal & no CEC for 8 hours
.............................................................................................1.1 W
Network standby: ON
(Wired) ....................................................................................2.1 W
(Wi-Fi)......................................................................................2.4 W
(Wireless Direct)......................................................................2.4 W
(Bluetooth)...............................................................................2.1 W
HDMI control: ON / Standby through: ON
Network Standby: ON
(Wireless Direct)......................................................................3.1 W
Maximum Power Consumption [R, L, V, S, H models]
..................................................................................................590W
Dimension (W x H x D)
[RX-V681]
..............................435x171x378mm(17-1/8"x6-3/4"x14-7/8")
[RX-A760]
.................................... 435x171x380mm(17-1/8"x6-3/4"x15")
Reference Dimension (with wireless antenna upright)
[RX-V681]
..............................435x234x378mm(17-1/8"x9-1/4"x14-7/8")
[RX-A760]
.................................... 435x234x380mm(17-1/8"x9-1/4"x15")
Weight
[RX-V681]
............................................................................10.0 kg (22.1 lbs.)
[RX-A760]
............................................................................10.5kg(23.2lbs.)
Finish
[RX-V681]
T model ........................................................................... Gold color
U, C, R, T, A, B, G, F, L, V, S, H models ......................... Black color
B, G, F models .......................................................... Titanium color
[RX-A760]
U, C, R, T, A, B, G, F, L models ...................................... Black color
Accessories
Remote control............................................................................... x 1
Batteries (R03, AAA, UM-4)........................................................... x 2
FM antenna (1.4 m) ....................................................................... x 1
AM antenna (1 m) .......................................................................... x 1
YPAO microphone (6.0 m) ............................................................. x 1
Remote control sheet (T model) .................................................... x 1
Antenna isolator (T model) ............................................................ x 1
Power cable (2.0 m) (RX-A760)..................................................... x 1
* Specifications are subject to change without notice.
U........................U.S.A. model
C................. Canadian model
R.................... General model
T.....................Chinese model
A.................Australian model
B.......................British model
G................. European model
F..................... Russian model
L................. Singapore model
V...................... Taiwan model
S...................Brazilian model
H...........................Thai model

13
RX-V681/RX-A760
RX-V681/RX-A760
Manufactured under license from Dolby Laboratories. Dolby, Dolby
Atmos, Dolby Surround, and the double-D symbol are trademarks of
Dolby Laboratories.
For DTS patents, see http://patents.dts.com. Manufactured under license
from DTS, Inc. DTS, the Symbol, DTS in combination with the Symbol,
DTS: X, and the DTS:X logo are registered trademarks or trademarks
of DTS, Inc. in the United States and/or other countries. © DTS, Inc. All
Rights Reserved.
Supports iOS 7 or later for setup using Wireless Accessory Configuration.
“Made for iPod,”“Made for iPhone,”and “Made for iPad”mean that an
electronic accessory has been designed to connect specifically to iPod,
iPhone, or iPad, respectively, and has been certified by the developer to
meet Apple performance standards.
Apple is not responsible for the operation of this device or its compliance
with safety and regulatory standards.
Please note that the use of this accessory with iPod, iPhone, or iPad may
affect wireless performance.
iTunes, AirPlay, iPad, iPhone, iPod, and iPod touch are trademarks of
Apple Inc., registered in the U.S. and other countries.
iPad Air and iPad mini are trademarks of Apple Inc.
App Store is a service mark of Apple Inc.
The Bluetooth® word mark and logos are registered trademarks owned by
Bluetooth SIG, Inc. and any use of such marks by Yamaha Corporation is
under license.
Bluetooth protocol stack (Blue SDK)
Copyright 1999-2014 OpenSynergy GmbH
All rights reserved. All unpublished rights reserved.
HDMI, the HDMI Logo, and High-Definition Multimedia Interface are
trademarks or registered trademarks of HDMI Licensing LLC in the United
States and other countries.
“x.v.Color”is a trademark of Sony Corporation.
“SILENT CINEMA”is a trademark of Yamaha Corporation.
DLNA ™ and DLNA CERTIFIED ™ are trademarks or registered trademarks
of Digital Living Network Alliance. All rights reserved. Unauthorized use is
strictly prohibited.
Windows ™
Windows is a registered trademark of Microsoft Corporation in the United
States and other countries.
Internet Explorer, Windows Media Audio and Windows Media Player are
either registered trademarks or trademarks of Microsoft Corporation in
the United States and/or other countries.
Android ™ Google Play ™
Android and Google Play are trademarks of Google Inc.
The Wi-Fi CERTIFIED Logo is a certification mark of the Wi-Fi Alliance.
The Wi-Fi Protected Setup Identifier Mark is a mark of the Wi-Fi Alliance.
MusicCast is a trademark or registered trademark of Yamaha Corporation.
Google Noto Fonts
Copyright © 2012 Google Inc. All rights reserved.
Licensed under the Apache License, Version 2.0 (the “License”); you may
not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an “AS IS”BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
or implied.
See the License for the specific language governing permissions and
limitations under the License.
Explanations regarding GPL
This product utilizes GPL/LGPL open-source software in some sections.
You have the right to obtain, duplicate, modify, and redistribute this
open-source code only. For information on GPL/LGPL open source
software, how to obtain it, and the GPL/LGPL license, refer to the Yamaha
Corporation website
(http://download.yamaha.com/sourcecodes/musiccast/).

14
RX-V681/RX-A760
RX-V681/RX-A760
•DIMENSIONS
RX-V681 RX-A760
Unit: mm (inch)
435 (17-1/8")
171(6-3/4")
150 (5-7/8")
21
(7/8")
Unit: mm (inch)
435 (17-1/8")
171(6-3/4")
150 (6")
21
(7/8")
335 (13-1/4")
Ø 60
325 (12-3/4")
193(7-5/8")
378 (14-7/8")
18
(3/4")
59
(2-1/4")
35
(1-3/8")
72 (2-7/8")
50
(2")
335 (13-1/4")
222.5 (8-3/4") 212.5 (8-3/8")
173 (6-3/4")
Ø 60
Ø 48/18
324 (12-3/4")
193(7-5/8")
380 (15")
21
(7/8")
59
(2-1/4")
72 (2-7/8")
50
(2")
Top view Top view
Front view Front view
35
(1-3/8")
234 (9-1/4") 234 (9-1/4")

15
RX-V681/RX-A760
RX-V681/RX-A760
■INTERNAL VIEW
a
OPERATION (3) P.C.B.
b
MAIN (2) P.C.B. (R, V, S models)
c
OPERATION (8) P.C.B.
d
Network Module
e
DIGITAL (1) P.C.B.
f
AM/FM TUNER
g
OPERATION (2) P.C.B.
h
OPERATION (9) P.C.B.
i
OPERATION (4) P.C.B.
j
MAIN (5) P.C.B.
k
MAIN (4) P.C.B.
l
MAIN (3) P.C.B.
m
MAIN (1) P.C.B.
n
MAIN (6) P.C.B.
o
POWER TRANSFORMER
p
OPERATION (7) P.C.B.
q
OPERATION (6) P.C.B.
r
OPERATION (1) P.C.B.
s
DIGITAL (2) P.C.B.
t
OPERATION (5) P.C.B.
RX-V681
Top view
Front view
2
j
tp
n klmo
r sq
1 8 93 4 5 6 7

16
RX-V681/RX-A760
RX-V681/RX-A760
■SERVICE PRECAUTIONS
Safety measures
•Some internal parts in this product contain high voltages and are dangerous.
Be sure to take safety measures during servicing, such as wearing insulating gloves.
•Note that the capacitors indicated below are dangerous even after the power is turned off because an electric charge
remains and a high voltage continues to exist there.
Before starting any repair work, connect a discharging resistor (5k-ohms/10 W) to the terminals of each capacitor indi-
cated below to discharge electricity.
The time required for discharging is about 30 seconds per each.
C1084 and C1085on MAIN (1) P.C.B.
C3706 on OPERATION (3) P.C.B.
For details, refer to “PRINTED CIRCUIT BOARDS”.
RX-A760
Top view
Front view
9
u
m jkln
qrstv
1 7 82 3 4 5 6
o p
a
OPERATION (3) P.C.B.
b
OPERATION (8) P.C.B.
c
Network Module
d
DIGITAL (1) P.C.B.
e
AM/FM TUNER
f
OPERATION (2) P.C.B.
g
OPERATION (9) P.C.B.
h
OPERATION (4) P.C.B.
i
MAIN (5) P.C.B.
j
MAIN (4) P.C.B.
k
MAIN (3) P.C.B.
l
MAIN (1) P.C.B.
m
MAIN (6) P.C.B.
n
POWER TRANSFORMER
o
OPERATION (5) P.C.B.
p
OPERATION (1) P.C.B.
q
OPERATION (12) P.C.B.
r
DIGITAL (2) P.C.B.
s
OPERATION (11) P.C.B.
t
OPERATION (6) P.C.B.
u
OPERATION (7) P.C.B.
v
OPERATION (10) P.C.B.

17
RX-V681/RX-A760
RX-V681/RX-A760
■DISASSEMBLY PROCEDURES
RX-V681
(Remove parts in the order as numbered.)
Disconnect the power cable from the AC outlet.
1. Removal of Top Cover
a. Remove 4 screws (1) and 5screws (2). (Fig. 1)
b. Lift the rear side of the top cover to remove it. (Fig. 1)
2. Removal of Front Panel Unit
a. Remove 6 screws (3), and remove W301 and W307. (Fig. 1)
b. Remove CB1, CB6, CB82, CB308, CB343, CB941 and CB951. (Fig. 1)
c. Release 2 hooks, and remove the front panel unit. (Fig. 1)
Fig. 1
CB343
DIGITAL (1) P. C.B.
OPERATION (2) P. C.B.
Hook
Front panel unit
③
③
CB308
W307
W301
OPERATION (7) P. C.B.
③
Hook
①
②
CB82
CB1
CB6
CB941
CB951
Top cover
①

18
RX-V681/RX-A760
RX-V681/RX-A760
3. Removal of Network Module
a. The Wireless LAN Antenna Connector is removed by using MHF Connector Remover. (Fig. 2)
b. Remove a screw (4). (Fig. 2)
c. Remove the Network Module to upward.
CAUTION !
•To remove the Wireless LAN Antenna Connector, use the special MHF Connector Remover. Hook the tip of this tool on
the cover of the Wireless LAN Antenna Connector and pull it straight in the direction of the engaging axis of the Wireless
LAN Antenna Connector. (Fig. 3)
Special removing tool
ZK708100: MHF Connector Remover
•The Wireless LAN Antenna Connector should only be plugged back to the Network Module after it has been installed
back onto the DIGITAL P.C.B.
•When plugging the Wireless LAN Antenna Connector back to the Network Module, make sure to hold it and insert it ver-
tically using the MHF Connector Remover. Make sure not to insert the Wireless LAN Antenna Connector at a sharp angle
as it may break.
•The Wireless LAN Antenna Connector can be inserted and removed up to 5times only.
Wireless LAN
Antenna Connector
Network module
④
Fig. 2
MHF Connector Remover
Wireless LAN Antenna Connector
Fig. 3

19
RX-V681/RX-A760
RX-V681/RX-A760
DIGITAL (1) P. C.B.
CB76
CB942
CB944
CB79
CB78
CB80 CB946
CB948
CB949
CB381
OPERATION (4) P. C.B.
AMP unit
Power transformer
Board-to-board connectors
⑥
⑦
⑨
⑩⑩
⑥
⑧
⑨
⑨
CB945
Board-to-board connectors
①①
②
Cable
Remove CB946 and CB948
①
②
Unlock the connector
Remove the cable
Connected
①①
②
Cable
Connect CB946 and CB948
①
②
Lock the connector
Insert the cable
Connected
4. Removal of DIGITAL (1) P.C.B.
a. Remove screw (4) and 6 screws (5). (Fig. 5)
b. Remove 3 screws. (6). (Fig. 4)
c.
Remove CB76, CB78, CB79, CB80, CB942, CB944 and
CB949. (Fig. 4)
d. Unlock and remove CB946 and CB948. (Fig. 4)
e. Remove the DIGITAL (1) P.C.B. which is connected
directly to the OPERATION (4) P.C.B. with board-
toboard connectors. (Fig. 4)
Fig. 5
Fig. 4
5. Removal of AMP Unit and Power Transformer
a. Remove screw (7), 3 screws (8), 4 screws (9) and
4 screws (j). (Fig. 4)
b. Remove 3 screws (k). (Fig. 5)
c. Remove the AMP unit together with the power trans-
former. (Fig. 4)
⑪
⑤④

20
RX-V681/RX-A760
RX-V681/RX-A760
When checking the DIGITAL (1) P.C.B.:
•Put the rubber sheet and cloth over this unit, and place the DIGITAL (1) P.C.B. on them. (Fig. 6)
•Connect ST953 on DIGITAL (1) P.C.B. to the chassis with a ground lead. (Fig. 6)
•Reconnect all cables (connectors) that have been disconnected. Be sure to use the P.C.B. CHECKING JIG (Part No.
ZF454800) to connect between the following connectors.
CB945on DIGITAL (1) P.C.B. – CB381 on OPERATION (4) P.C.B.
•When connecting the flexible flat cable, be careful with polarity.
DIGITAL (1) P.C.B.
OPERATION (4) P.C.B.
P.C.B. CHECKING JIG
CB948
CB381
CB154
CB155
Rubber sheet and cloth
ST953
Ground lead
Chassis
CB946
CB945
Fig. 6