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AV RECEIVER/AV AMPLIFIER
RX-V740/RX-V740RDS/DSP-AX740
RX-V640/RX-V640RDS/HTR-5660/DSP-AX640/DSP-AX640SE
SERVICE MANUAL




IMPORTANT NOTICE
This manual has been provided for the use of authorized YAMAHA Retailers and their service personnel.
It has been assumed that basic service procedures inherent to the industry, and more specifically YAMAHA Products, are already
known and understood by the users, and have therefore not been restated.
WARNING: Failure to follow appropriate service and safety procedures when servicing this product may result in personal
injury, destruction of expensive components, and failure of the product to perform as specified. For these reasons,
we advise all YAMAHA product owners that any service required should be performed by an authorized
YAMAHA Retailer or the appointed service representative.
IMPORTANT: The presentation or sale of this manual to any individual or firm does not constitute authorization, certification or
recognition of any applicable technical capabilities, or establish a principle-agent relationship of any form.
The data provided is believed to be accurate and applicable to the unit(s) indicated on the cover. The research, engineering, and
service departments of YAMAHA are continually striving to improve YAMAHA products. Modifications are, therefore, inevitable
and specifications are subject to change without notice or obligation to retrofit. Should any discrepancy appear to exist, please
contact the distributor's Service Division.
WARNING: Static discharges can destroy expensive components. Discharge any static electricity your body may have




RX-V640/RX-V640RDS/HTR-5660/DSP-AX640/DSP-AX640SE
accumulated by grounding yourself to the ground buss in the unit (heavy gauge black wires connect to this buss).
IMPORTANT: Turn the unit OFF during disassembly and part replacement. Recheck all work before you apply power to the unit.




RX-V740/RX-V740RDS/DSP-AX740
I CONTENTS
TO SERVICE PERSONNEL .......................................... 2 AMP ADJUSTMENT 45
IMPEDANCE SELECTOR ............................................. 2 DISPLAY DATA ..................................................... 46~47
FRONT PANELS ........................................................ 3~5 IC DATA ................................................................. 48~53
REAR PANELS ........................................................ 6~12 BLOCK DIAGRAM ................................................. 54~55
REMOTE CONTROL PANELS .................................... 13 PRINTED CIRCUIT BOARD .................................. 56~79
SPECIFICATIONS / 14~17 PIN CONNECTION DIAGRAM .................................... 80
INTERNAL VIEW ......................................................... 18 SCHEMATIC DIAGRAM ........................................ 81~92
DISASSEMBLY PROCEDURES ......... 19~22 PARTS LIST ......................................................... 93~147
SELF DIAGNOSIS FUNCTION (DIAG) REMOTE CONTROL .......................................... 148~152
23~44




Copyright 2003 YAMAHA CORPORATION
100847 This manual is copyrighted by YAMAHA and may not be copied or
redistributed either in print or electronically without permission.
P.O.Box 1, Hamamatsu, Japan
RX-V740/RX-V740RDS/DSP-AX740
RX-V640/RX-V640RDS/HTR-5660/DSP-AX640/DSP-AX640SE


I TO SERVICE PERSONNEL AC LEAKAGE
WALL EQUIPMENT TESTER OR
1. Critical Components Information OUTLET UNDER TEST EQUIVALENT
Components having special characteristics are marked s
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 INSULATING
from supply circuits. TABLE
G Meter impedance should be equivalent to 1500 ohm shunted G Leakage current must not exceed 0.5mA.
by 0.15µF. G Be sure to test for leakage with the AC plug in both polarities.

"CAUTION"
"F701, 702: FOR CONTINUED PROTECTION AGAINST RISK OF FIRE, REPLACE ONLY WITH SAME TYPE 8A, 125V FUSE."
CAUTION
F701, 702: REPLACE WITH SAME TYPE 8A, 125V FUSE.
ATTENTION
F701, 702: UTILISER UN FUSIBLE DE RECHANGE DE MEME TYPE DE 8A, 125V.



WARNING: CHEMICAL CONTENT NOTICE!
The solder used in the production of this product contains LEAD. In addition, other electrical/electronic and/or plastic (where
applicable) components may also contain traces of chemicals found by the California Health and Welfare Agency (and
possibly other entities) to cause cancer and/or birth defects or other reproductive harm.

DO NOT PLACE SOLDER, ELECTRICAL/ELECTRONIC OR PLASTIC COMPONENTS IN YOUR MOUTH FOR ANY REA-
SON WHATSOEVER!

Avoid prolonged, unprotected contact between solder and your skin! When soldering, do not inhale solder fumes or expose
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.


· DIMENSIONS
I IMPEDANCE SELECTOR


(13/16")
21
RX-V640/RX-V640RDS/HTR-5660/DSP-AX640/DSP-AX640SE
RX-V740/RX-V740RDS/DSP-AX740




388.7 (15-5/16")
349.3 (13-3/4")
18.4
(3/4")




IMPEDANCE SELECTOR
150 (5-7/8")
171 (6-3/4")




WARNING:
Do not change the IMPEDANCE SELECTOR
switch setting while the power to this unit is
on, otherwise this unit may be damaged.
435 (17-1/8")
(13/16")
21




Unit : mm (inch)


2
RX-V740/RX-V740RDS/DSP-AX740
RX-V640/RX-V640RDS/HTR-5660/DSP-AX640/DSP-AX640SE



I FRONT PANELS
RX-V740 (U, C, A, L, R, T, K models)




RX-V740RDS (B, G models)




RX-V640/RX-V640RDS/HTR-5660/DSP-AX640/DSP-AX640SE
RX-V740/RX-V740RDS/DSP-AX740
DSP-AX740 (J model)




3
RX-V740/RX-V740RDS/DSP-AX740
RX-V640/RX-V640RDS/HTR-5660/DSP-AX640/DSP-AX640SE


RX-V640 (U, C, A, L, R, T, K models)




RX-V640RDS (B, G models)
RX-V640/RX-V640RDS/HTR-5660/DSP-AX640/DSP-AX640SE
RX-V740/RX-V740RDS/DSP-AX740




HTR-5660 (U, C, A, T, K models)




4
RX-V740/RX-V740RDS/DSP-AX740
RX-V640/RX-V640RDS/HTR-5660/DSP-AX640/DSP-AX640SE


DSP-AX640 (J model)




DSP-AX640SE (B, G models)




RX-V640/RX-V640RDS/HTR-5660/DSP-AX640/DSP-AX640SE
RX-V740/RX-V740RDS/DSP-AX740




5
RX-V740/RX-V740RDS/DSP-AX740
RX-V640/RX-V640RDS/HTR-5660/DSP-AX640/DSP-AX640SE



I REAR PANELS
RX-V740 (U, C models)




RX-V740 (A model)
RX-V640/RX-V640RDS/HTR-5660/DSP-AX640/DSP-AX640SE
RX-V740/RX-V740RDS/DSP-AX740




RX-V740 (L model)




6
RX-V740/RX-V740RDS/DSP-AX740
RX-V640/RX-V640RDS/HTR-5660/DSP-AX640/DSP-AX640SE




RX-V740 (R, T, K models)




RX-V740RDS (B model)




RX-V640/RX-V640RDS/HTR-5660/DSP-AX640/DSP-AX640SE
RX-V740/RX-V740RDS/DSP-AX740
RX-V740RDS (G model)




7
RX-V740/RX-V740RDS/DSP-AX740
RX-V640/RX-V640RDS/HTR-5660/DSP-AX640/DSP-AX640SE


DSP-AX740 (J model)




RX-V640 (U, C models)
RX-V640/RX-V640RDS/HTR-5660/DSP-AX640/DSP-AX640SE
RX-V740/RX-V740RDS/DSP-AX740




RX-V640 (A model)




8
RX-V740/RX-V740RDS/DSP-AX740
RX-V640/RX-V640RDS/HTR-5660/DSP-AX640/DSP-AX640SE


RX-V640 (L model)




RX-V640 (R, T, K models)




RX-V640/RX-V640RDS/HTR-5660/DSP-AX640/DSP-AX640SE
RX-V740/RX-V740RDS/DSP-AX740
RX-V640RDS (B model)




9
RX-V740/RX-V740RDS/DSP-AX740
RX-V640/RX-V640RDS/HTR-5660/DSP-AX640/DSP-AX640SE


RX-V640RDS (G model)




HTR-5660 (U, C models)
RX-V640/RX-V640RDS/HTR-5660/DSP-AX640/DSP-AX640SE
RX-V740/RX-V740RDS/DSP-AX740




HTR-5660 (A model)




10
RX-V740/RX-V740RDS/DSP-AX740
RX-V640/RX-V640RDS/HTR-5660/DSP-AX640/DSP-AX640SE


HTR-5660 (T, K models)




DSP-AX640 (J model)




RX-V640/RX-V640RDS/HTR-5660/DSP-AX640/DSP-AX640SE
RX-V740/RX-V740RDS/DSP-AX740
DSP-AX640SE (B model)




11
RX-V740/RX-V740RDS/DSP-AX740
RX-V640/RX-V640RDS/HTR-5660/DSP-AX640/DSP-AX640SE


DSP-AX640SE (G model)
RX-V640/RX-V640RDS/HTR-5660/DSP-AX640/DSP-AX640SE
RX-V740/RX-V740RDS/DSP-AX740




12
RX-V740/RX-V740RDS/DSP-AX740
RX-V640/RX-V640RDS/HTR-5660/DSP-AX640/DSP-AX640SE



I REMOTE CONTROL PANELS
RX-V740 (U, C, A, L, R, T, K models) RX-V640 (U, C, A, L, R, T, K models)
DSP-AX740 (J model) HTR-5660 (U, C, A, T, K models)
DSP-AX640 (J model)




RX-V640/RX-V640RDS/HTR-5660/DSP-AX640/DSP-AX640SE
RX-V640RDS (B, G models)




RX-V740/RX-V740RDS/DSP-AX740
DSP-AX640SE (B, G models)




RX-V740RDS (B, G models)




13
RX-V740/RX-V740RDS/DSP-AX740
RX-V640/RX-V640RDS/HTR-5660/DSP-AX640/DSP-AX640SE


[RX-V640/RX-V640RDS/HTR-5660/DSP-AX640/DSP-AX640SE]
I SPECIFICATIONS / (1 kHz, 0.7% THD, 4 ohms)
MAIN L/R ................................................................. 135W + 135W
I Audio Section CENTER, REAR CENTER ..................................... 135W + 135W
REAR L/R ................................................................ 135W + 135W
Minimum RMS Output Power (Power Amp. Section)
IEC Power [B, G, L models]
[RX-V740/RX-V740RDS/DSP-AX740]
[RX-V740/RX-V740RDS/DSP-AX740]
1 kHz, 0.06% THD, 8 ohms .................................... 105W + 105W
(20 Hz to 20 kHz)
MAIN L/R [RX-V640/RX-V640RDS/HTR-5660/DSP-AX640/DSP-AX640SE]
U, C models (0.06% THD, 8 ohms) ............. (FTC) 90W + 90W 1 kHz, 0.06% THD, 8 ohms .................................... 100W + 100W
A, B, G, L, R, T, K models (0.06% THD, 8 ohms) ... 90W + 90W Dynamic Power Per Channel (IHF)
J model (0.06% THD, 6 ohms) ............................... 90W + 90W [RX-V740/RX-V740RDS/DSP-AX740]
CENTER, REAR CENTER U, C models (8/6/4/2 ohms) ............................ 130/160/190/235W
U, C models (0.06% THD, 8 ohms) ............. (FTC) 90W + 90W A, B, G, L, R, T, K models (8/6/4/2 ohms) ..... 120/145/185/230W
A, B, G, L, R, T, K models (0.06% THD, 8 ohms) ... 90W + 90W J model (8/6/4/2 ohms) ....................................... ­/130/160/205W
J model (0.06% THD, 6 ohms) ............................... 90W + 90W [RX-V640/RX-V640RDS/HTR-5660/DSP-AX640/DSP-AX640SE]
REAR L/R U, C models (8/6/4/2 ohms) ............................ 125/155/185/230W
U, C models (0.06% THD, 8 ohms) ............. (FTC) 90W + 90W A, B, G, L, R, T, K models (8/6/4/2 ohms) ..... 115/140/180/225W
A, B, G, L, R, T, K models (0.06% THD, 8 ohms) ... 90W + 90W J model (6/4/2 ohms) .......................................... ­/125/155/200W
J model (0.06% THD, 6 ohms) ............................... 90W + 90W Dynamic Headroom
(1 kHz) [RX-V740/RX-V740RDS/DSP-AX740]
MAIN L/R U, C models (8 ohms) ....................................................... 1.60 dB
U, C models (0.7% THD, 8 ohms) ........... (FTC) 110W + 110W [RX-V640/RX-V640RDS/HTR-5660/DSP-AX640/DSP-AX640SE]
A, B, G, L, R, T, K models (0.7% THD, 8 ohms) ... 110W + 110W U, C models (8 ohms) ....................................................... 1.67 dB
CENTER, REAR CENTER Damping Factor
U, C models (0.7% THD, 8 ohms) ........... (FTC) 110W + 110W 20 Hz to 20 kHz, SPEAKER-A, 8 ohms .................... 100 or more
A, B, G, L, R, T, K models (0.7% THD, 8 ohms) 110W + 110W Input Sensitivity / Input Impedance
REAR L/R PHONO (MM)(RX-V740/RX-V740RDS/DSP-AX740)
U, C models (0.7% THD, 8 ohms) ........... (FTC) 110W + 110W ........................................................................ 2.5 mV / 47 k-ohms
A, B, G, L, R, T, K models (0.7% THD, 8 ohms) ... 110W + 110W CD, etc. ......................................................... 150 mV / 47 k-ohms
[RX-V640/RX-V640RDS/HTR-5660/DSP-AX640/DSP-AX640SE] EXT. DECODER
(20 Hz to 20 kHz) MAIN L/R, CENTER, SURROUND L/R, SUB WOOFER
MAIN L/R .................................................................. 150 mV / 47 k-ohms
U, C models (0.06% THD, 8 ohms) ............. (FTC) 85W + 85W Maximum Input Signal Level
A, B, G, L, R, T, K models (0.06% THD, 8 ohms) ... 85W + 85W PHONO (MM) (1 kHz, 0.1% THD) ......................... 50 mV or more
J model (0.06% THD, 6 ohms) ............................... 85W + 85W CD, etc. (1 kHz, 0.5% THD, Effect On) ................... 2.2 V or more
CENTER, REAR CENTER Output Level / Output Impedance
U, C models (0.06% THD, 8 ohms) ............. (FTC) 85W + 85W REC OUT ..................................................... 150 mV / 1.2 k-ohms
A, B, G, L, R, T, K models (0.06% THD, 8 ohms) ... 85W + 85W PRE OUT ......................................................... 2.4 V / 1.2 k-ohms
J model (0.06% THD, 6 ohms) ............................... 85W + 85W SUB WOOFER (Stereo & MAIN SP: Small) ...... 4 V / 1.2 k-ohms
REAR L/R ZONE 2 OUT ................................................ 150 mV / 1.5 k-ohms
U, C models (0.06% THD, 8 ohms) ............. (FTC) 85W + 85W Headphone Jack Rated Output / Impedance
A, B, G, L, R, T, K models (0.06% THD, 8 ohms) ... 85W + 85W
J model (0.06% THD, 6 ohms) ............................... 85W + 85W CD, etc. (1 kHz, 35 mV, 8 ohms) ................... 150 mV / 100 ohms
(1 kHz) Frequency Response
MAIN L/R CD, etc. to MAIN L/R (10 Hz to 100 kHz) ..................... +0/-3.0dB
U, C models (0.7% THD, 8 ohms) ........... (FTC) 105W + 105W Total Harmonic Distortion (20Hz to 20kHz)
A, B, G, L, R, T, K models (0.7% THD, 8 ohms) ... 105W + 105W PHONO (MM) to REC OUT (1V)
CENTER, REAR CENTER (RX-V740/RX-V740RDS/DSP-AX740) .................... 0.02% or less
U, C models (0.7% THD, 8 ohms) ........... (FTC) 105W + 105W CD, etc. (Effect Off) to MAIN L/R SP OUT (45W, 8 ohms) ... 0.06% or less
RX-V640/RX-V640RDS/HTR-5660/DSP-AX640/DSP-AX640SE




A, B, G, L, R, T, K models (0.7% THD, 8 ohms) 105W + 105W RIAA Equalization Deviation
REAR L/R PHONO (MM) ................................................................... 0±0.5dB
U, C models (0.7% THD, 8 ohms) ........... (FTC) 105W + 105W
Signal to Noise Ratio (IHF-A network)
A, B, G, L, R, T, K models (0.7% THD, 8 ohms) ... 105W + 105W
PHONO (MM) (Input shorted) to REC OUT
RX-V740/RX-V740RDS/DSP-AX740




Maximum Power (EIAJ, 1kHz, 10% THD) (RX-V740/RX-V740RDS/DSP-AX740)
[RX-V740/RX-V740RDS/DSP-AX740] U, C, R, T, K models (5mV) .................................. 86dB or more
MAIN L/R A, B, G, L models (5mV) ....................................... 81dB or more
R, T, K models (8 ohms) ..................................... 130W + 130W J model (2.5mV) .................................................... 80dB or more
J model (6 ohms) ................................................ 140W + 140W CD, etc. (Input shorted, EFFECT OFF) to MAIN L/R
CENTER, REAR CENTER 250mV ................................................................. 100dB or more
R, T, K models (8 ohms) ..................................... 130W + 130W Residual Noise (IHF-A network)
J model (6 ohms) ................................................ 140W + 140W MAIN L/R SP OUT .................................................. 150µV or less
REAR L/R
Channel Separation
R, T, K models (8 ohms) ..................................... 130W + 130W
(Vol -30 dB, Effect Off)
J model (6 ohms) ................................................ 140W + 140W
PHONO (Input shorted, 1 kHz/10 kHz)
[RX-V640/RX-V640RDS/HTR-5660/DSP-AX640/DSP-AX640SE] (RX-V740/RX-V740RDS/DSP-AX740)60 dB or more/55 dB or more
MAIN L/R CD, etc. (Input 5.1 k-ohms shorted, 1 kHz/10 kHz)
R, T, K models (8 ohms) ..................................... 125W + 125W ........................................................ 60 dB or more/45 dB or more
J model (6 ohms) ................................................ 135W + 135W
Tone Control Characteristics
CENTER, REAR CENTER
BASS
R, T, K models (8 ohms) ..................................... 125W + 125W
Boost/Cut ............................................................ ±10dB (50Hz)
J model (6 ohms) ................................................ 135W + 135W
Turnover Frequency ....................................................... 350Hz
REAR L/R
TREBLE
R, T, K models (8 ohms) ..................................... 125W + 125W
Boost/Cut .......................................................... ±10dB (20kHz)
J model (6 ohms) ................................................ 135W + 135W
Turnover Frequency ...................................................... 3.5kHz
DIN Standard Output Power Per Channel [B, G, L
Filter Characteristics
models] MAIN, REAR L/R SP Small (H.P.F.) .................. 90Hz / 12dB oct.
[RX-V740/RX-V740RDS/DSP-AX740] SUBWOOFER (L.P.F.) ....................................... 90Hz / 18dB oct.
(1 kHz, 0.7% THD, 4 ohms)
MAIN L/R ................................................................. 140W + 140W
CENTER, REAR CENTER ..................................... 140W + 140W
REAR L/R ................................................................ 140W + 140W

14
RX-V740/RX-V740RDS/DSP-AX740
RX-V640/RX-V640RDS/HTR-5660/DSP-AX640/DSP-AX640SE


I Video Section Maximum Power Consumption
(6ch Drive, 10% THD)
Video Signal Type R model ............................................................................... 750 W
U, C, J models ..................................................................... NTSC AC Outlets
A, B, G, L models .................................................................... PAL 2 switched outlets
R, T, K models ......................................................... NTSC or PAL U, C, G, L, J models ........................................ 100 W max. total
Video Signal Level R, T models ........................................................ 50 W max. total
............................................................................ 1 Vp-p / 75 ohms 1 switched outlet
S-Video Signal Level A, B models ............................................................... 100W max.
Y ......................................................................... 1 Vp-p / 75 ohms Dimensions (W x H x D)
C .................................................................. 0.286 Vp-p / 75 ohms .......................... 435 x 171 x 390 mm (17-1/8" x 6-3/4" x 15-3/8")
Component Signal Level Weight
Y ......................................................................... 1 Vp-p / 75 ohms .................................................................. 13.0 kg (28 lbs. 11 oz.)
Cb/Cr ............................................................... 0.7 Vp-p / 75 ohms Finish
Maximum Input Level RX-V740 ................................ Gold color (L, R, T, K) models
.......................................................................................... 1.5 Vp-p Black color (U, C, A, R) models
Signal to Noise Ratio RX-V640 ................................ Gold color (L, R, T, K) models
................................................................................. 50 dB or more Black color (U, C, A, R) models
Monitor Out Frequency Response RX-V740RDS ........................... Black color (B, G) models
Video Signal Level, S-Video Signal Level ... 5 Hz to 10 MHz, -3 dB Titanium color (B, G) models
Component Video Signal Level [U, C, A, B, G, L, R, T, K models] RX-V640RDS ........................... Gold color (G) model
.................................................................... 5 Hz to 30 MHz, -3 dB Black color (B, G) models
D4-Video Signal Level [J model] ................ DC to 60 MHz, -3 dB Titanium color (B, G) models
HTR-5660 .............................. Gold color (T, K) models
I FM Section (except DSP-AX640SE) Black color (U, C, A) models
DSP-AX740/DSP-AX640 ...... Gold color (J) model
Tuning Range
DSP-AX640SE ...................... Black color (B, G) models
U, C models ..................................................... 87.5 to 107.9 MHz
Titanium color (B, G) models
A, B, G, L models ............................................. 87.5 to 108.0 MHz
R, T, K models .................... 87.5 to 108.0 / 87.50 to 108.00 MHz Accessories
J model ............................................................... 76.0 to 90.0 MHz Remote Control, Batteries (Manganese Dry), Indoor FM Antenna,
AM Loop Antenna, PAL 75/300 Socket [B model]
50dB Quieting Sensitivity (IHF)
(1kHz, 100% Mod.)
Mono .................................................................. 2.0 µV (17.3 dBf)
Stereo .................................................................. 25 µV (39.2 dBf) * Specifications are subject to change without notice due to product
Usable Sensitivity (IHF) improvements.
Mono .................................................................. 1.0 µV (11.2 dBf)
Selectivity
at 400 kHz ............................................................................ 70 dB
Signal to Noise Ratio (IHF) U .......... U.S.A. model C ...... Canadian model
Mono / Stereo .......................................................... 76 dB / 70 dB A .......... Australian model B ...... British model
Harmonic Distortion G .......... European model L ....... Singapore model
(1 kHz) R .......... General model T ....... Chinese model
Mono/Stereo ................................................................. 0.2 / 0.3 % K .......... Korean model J ....... Japanese model
Stereo Separation
1 kHz .................................................................................... 42 dB
Frequency Response
20 Hz to 15 kHz .......................................................... +0.5 / -2 dB
Antenna Input
...................................................................... 75 ohms unbalanced Manufactured under license from Dolby Laboratories.
"Dolby", "Pro Logic" and the double-D symbol are trademarks of




RX-V640/RX-V640RDS/HTR-5660/DSP-AX640/DSP-AX640SE
I AM Section (except DSP-AX640SE) Dolby Laboratories.
Tuning Range
U, C models ....................................................... 530 to 1,710 kHz




RX-V740/RX-V740RDS/DSP-AX740
A, B, G, L, K, J models ...................................... 531 to 1,611 kHz
R, T models ................................ 530 to 1,710 / 531 to 1,611 kHz
Usable Sensitivity
........................................................................................ 300 µV/m
Antenna
................................................................................. Loop Antenna "DTS", "DTS-ES Extended Surround" and "Neo: 6" are
trademarks of Digital Theater Systems, Inc.
I General
Power Supply
U, C models ........................................................ AC 120 V, 60 Hz
A model ............................................................... AC 240 V, 50 Hz
B, G, L models .................................................... AC 230 V, 50 Hz
R model .................................... AC 110/120/220/240 V, 50/60 Hz
T model ............................................................... AC 220 V, 50 Hz
K model ............................................................... AC 220 V, 60 Hz
J model ........................................................... AC 100V, 50/60 Hz
Power Consumption
U, C models ......................................................... 320 W / 420 VA
A, B, G, L, R, T, K models .................................................. 320 W
J model ................................................................................ 270 W
Standby Power Consumption (reference data)
U, C models ......................................................................... 0.9 W
A, B, G, L models ................................................................. 0.9 W
R, T, K models ..................................................................... 0.7 W
J model ................................................................................. 0.8 W




15
RX-V740/RX-V740RDS/DSP-AX740
RX-V640/RX-V640RDS/HTR-5660/DSP-AX640/DSP-AX640SE


· Set Menu Table
Category Model RX-V740/RX-V740RDS/DSP-AX740 RX-V640/RX-V640RDS/HTR-5660/DSP-AX640/DSP-AX640SE
RX-V640/RX-V640RDS/HTR-5660/DSP-AX640/DSP-AX640SE
RX-V740/RX-V740RDS/DSP-AX740




16
RX-V740/RX-V740RDS/DSP-AX740
RX-V640/RX-V640RDS/HTR-5660/DSP-AX640/DSP-AX640SE


· The variable range of the parameter (Min/Max/Step)
Parameter name Pro Logic Pro Logic II Pro Logic II Neo:6 2ch DD/dts/AAC 6.1/ES Unit
Movie Music
DSP LEVEL - - - - -6/3/1 -6/3/1 -6/3/1 dB
(P.) INIT. DLY - - - - 1/99/1 1/99/1 1/99/1 ms
(P.) ROOM SIZE - - - - 0.1/2.0/0.1 0.1/2.0/0.1 0.1/2.0/0.1 -
(P.) LIVENESS - - - - 0/10/1 0/10/1 0/10/1 -
S. INIT. DLY - - - - 1/49/1 1/49/1 1/49/1 ms
S. ROOM SIZE - - - - 0.1/2.0/0.1 0.1/2.0/0.1 0.1/2.0/0.1 -
S. LIVENESS - - - - 0/10/1 0/10/1 0/10/1 -
RC. INT. DLY - - - - - - 1/49/1 ms
RC. ROOM SIZE - - - - - - 0.1/2.0/0.1 -
RC. LIVENESS - - - - - - 0/10/1 -
REV. TIME - - - - 1.0/5.0/0.1 1.0/5.0/0.1 1.0/5.0/0.1 s
REV. DELAY - - - - 0/250/1 0/250/1 0/250/1 ms
REV. LEVEL - - - - 0/100/1 0/100/1 0/100/1 %
PANORAMA - OFF OFF/ON - - - - -
DIMENSIONS - 0 (STD) -3/+3/1 - - - - -
CT WIDTH - 0 0/7/1 - - - - -
C. IMAGE - - - 0/0.5/0.1 - - - -


6ch Stereo Parameter Unit
CT. LEVEL 0/100/1 %
RL. LEVEL 0/100/1 %
RC. LEVEL 0/100/1 %
RR. LEVEL 0/100/1 %




RX-V640/RX-V640RDS/HTR-5660/DSP-AX640/DSP-AX640SE
RX-V740/RX-V740RDS/DSP-AX740




17
RX-V740/RX-V740RDS/DSP-AX740
RX-V640/RX-V640RDS/HTR-5660/DSP-AX640/DSP-AX640SE



I INTERNAL VIEW
1 2 34 5 6 7 89 0 A 1 POWER (2) P.C.B.
2 POWER (3) P.C.B.
(R, T, K models only)
B 3 MAIN (2) P.C.B.
4 VIDEO P.C.B.
C
(J model only)
D 5 FUNCTION (8) P.C.B.
(U, C, A models only)
E 6 MAIN (4) P.C.B.
F 7 Tuner
G (except DSP-AX640SE)
H
8 FUNCTION (7) P.C.B.
(U, C, A, B, G, L, R, T, K models only)
9 FUNCTION (5) P.C.B.
0 FUNCTION (6) P.C.B.
A FUNCTION (2) P.C.B.
B DSP P.C.B.
C FUNCTION (3) P.C.B.
D FUNCTION (4) P.C.B.
E MAIN (1) P.C.B.
N M L K J I F FUNCTION (1) P.C.B.
G POWER (1) P.C.B.
H MAIN (3) P.C.B.
I OPERATION (6) P.C.B.
J OPERATION (3) P.C.B.
K OPERATION (4) P.C.B.
L OPERATION (1) P.C.B.
M OPERATION (2) P.C.B.
N OPERATION (5) P.C.B.
RX-V640/RX-V640RDS/HTR-5660/DSP-AX640/DSP-AX640SE
RX-V740/RX-V740RDS/DSP-AX740




18
RX-V740/RX-V740RDS/DSP-AX740
RX-V640/RX-V640RDS/HTR-5660/DSP-AX640/DSP-AX640SE



I DISASSEMBLY PROCEDURES
* The description below uses RX-V740RDS (G model) as
a representative model.

(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 4 screws (2). (Fig. 1) 1 2
b. Slide the Top Cover rearward to remove it. (Fig. 1)

2. Removal of Front Panel
Remove 6 screws (3) and then remove the Front Panel.
(Fig. 1) 3

3. Removal of Sub Chassis
a. Remove 2 push rivets (4) and then remove the Side
Plates. (Fig. 1) 4
b. Remove 2 screws (5) and then remove the Sub
Chassis. (Fig. 2) 5
c. Loosen the harness fixture fixing the cable.
d. Remove CB305, 306, 572, 604 and 605. (Fig. 2)


2 Top Cover



2
1


Side Plate



4
1
3




RX-V640/RX-V640RDS/HTR-5660/DSP-AX640/DSP-AX640SE
RX-V740/RX-V740RDS/DSP-AX740
Side Plate

3
CB605
4
Front Panel Unit


CB572
Fig. 1



5
CB604
CB305

CB306
Sub Chassis

5
Fig. 2
19
RX-V740/RX-V740RDS/DSP-AX740
RX-V640/RX-V640RDS/HTR-5660/DSP-AX640/DSP-AX640SE


4. Removal of DSP P.C.B.
a. Remove 1 screw (6). (Fig. 3) 6
b. Remove 6 screws (7). (Fig. 4) 7
c. Remove CB602 and CB603. (Fig. 3)
d. Remove the DSP P.C.B. with the Support/DSP. (Fig. 3)




DSP P.C.B.
CB304




CB602


CB104 CB603
CB307
6 Support/DSP




Fig. 3


7 8
RX-V640/RX-V640RDS/HTR-5660/DSP-AX640/DSP-AX640SE
RX-V740/RX-V740RDS/DSP-AX740




Fig. 4




20
RX-V740/RX-V740RDS/DSP-AX740
RX-V640/RX-V640RDS/HTR-5660/DSP-AX640/DSP-AX640SE


5. Removal of FUNCTION (1) ~ (7) P.C.B.s and Tuner
a. Remove CB104, CB304 and CB307. (Fig. 3)
b. Remove 23 screws (8). (Fig. 3) 8
c. Remove FUNCTION (1) ~ (7) P.C.B.s. and the Tuner.
(Fig. 5)

When checking the P.C.B.:
· Reconnect all cables (connectors) that have been
disconnected.
Be sure to use the extension cable for servicing for
the following section.
POWER (1) P.C.B. CB601 ­ FUNCTION (1) P.C.B. CB307: POWER (1) P.C.B. CB601 ­ FUNCTION (1) P.C.B. CB307:
MF117200 (17P 200mm) MF117200 (17P 200mm)
· When connecting the flat cable, use care for the
polarity.
· The P.C.B. removed from the rear panel does not
work because its grounding is loose. Be sure to
connect the ground of each P.C.B. to the chassis or
GND with a jumper wire or the like.



FUNCTION (6) P.C.B.
FUNCTION (5) P.C.B.
FUNCTION (3) P.C.B.
FUNCTION (7) P.C.B. (except J model)
FUNCTION (4) P.C.B.

P.C.B.

Tuner




RX-V640/RX-V640RDS/HTR-5660/DSP-AX640/DSP-AX640SE
RX-V740/RX-V740RDS/DSP-AX740
MF117200 FUNCTION (1) P.C.B.
FUNCTION (2) P.C.B.


Fig. 5




21
RX-V740/RX-V740RDS/DSP-AX740
RX-V640/RX-V640RDS/HTR-5660/DSP-AX640/DSP-AX640SE


6. Removal of MAIN (1), MAIN (3) and POWER (1)
P.C.B.s
a. Remove CB307. (Fig. 6)
b. Remove 2 screws (9) and 4 screws (0). (Fig. 6) 9 0
c. Loosen the harness fixture fixing the cable.
d. Remove MAIN (1), (3) and POWER (1) P.C.B.s.. (Fig.
6)

MAIN (1) P.C.B.
MAIN (3) P.C.B.