Yamaha dsp ax450

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AV RECEIVER/AV AMPLIFIER
RX-V550/HTR-5750

RX-V450/HTR-5740/DSP-AX450

SERVICE MANUAL

IMPORTANT NOTICE

This manual has been provided for the use or authorized YAMAHA Retailers and their service personnel.
it has been assumed that basic service procedures inherent to the industry, and more speciticaliy YAMAHA Products, are already
known and understood by the users, and have therefore not been restated.

WARNING: Failure to follow appropriate servtce 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 principleragem 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 disiiibulois Service Division.

WARNING: Static discharges can destroy expensive components. Discharge any static electricity your body may have
accumulated by grounding yourself to the ground buss in the unit (heavy gauge black wires connect to this buss).
IMPORTANT: Tum the unit OFF during disassembly and part replacement. Recheck all work before you apply power to the unit.

I CONTENTS

TO SERVICE PERSONNEL .......................................... 2
IMPEDANCE SELECTOR ............................................. 3
FRONT PANELS ........................................................ 4~6
REAR PANELS ...................... . 7~15
REMOTE CONTROL PANELS. 16
SPECIFICATIONS / §%I:I:I§fi . 17~18
INTERNAL VIEW ................ 18
DISASSEMBLY PROCEDURES / fifl¥¥ll§ ......... 19~21
SELF DIAGNOSIS FUNCTION (DIAG) /

Eafiéfifiigfi'é (57477") ..................................... 22~42

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This Service Manual uses recycled paper.

AMP ADJUSTMENT / 7 >7§I§§E¥ ........................... 43
IC DATA ................................................................. 44~49
BLOCK DIAGRAM ................................................. 50~51
DISPLAY DATA ............... 52
PRINTED CIRCUIT BOARD .. 53~73
PIN CONNECTION DIAGRAM 74
SCHEMATIC DIAGRAM ........................................ 75~85
PARTS LIST ......................................................... 87~123
REMOTE CONTROL .......................................... 124~125

YAMAHA

YAMAHA CORPORATION

P.O.Box 1, Hamamaisu. Japan

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RX-V450/HTR-5740/DSP-AX450

RX-V550lHTR-5750
RX-V450IHTR-5740/DSP-AX450

I TO SERVICE PERSONNEL

1. Critical Components Information
Components having special characteristics are marked Vi: AC LEAKAGE
and must be replaced with parts having specifications equal WALL EQUIPMENT TESTER OR
to those originally installed. OUTLET UNDER TEST EQUIVALENT

2. Leakage Current Measurement (For 120V Models Only)
When service has been completed, it is imperative to verify ® 3*
that all exposed conductive surfaces are properly insulated
from supply circuits. :

0 Meter impedance should be equivalent to 1500 ohm shunted INSULATING
by 0.1 SpF. TABLE

0 Leakage current must not exceed 0.5mA.

0 Be sure to test for leakage with the AC plug in both polarities.

CAUTION
A F1, 2: FOR CONTINUED PROTECTION AGAINST RISK OF FIRE, REPLACE ONLY WITH SAME TYPE 8A, 125V FUSE.

CAUTION
F1, 2: REPLACE WITH SAME TYPE 8A, 125V FUSE.

ATTENTION
F1, 2: 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.