Yamaha p4050

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POWER AMPLIFIER

[@LI-OSO

I CONTENTS (a :1)

SPECIFICATIONS (fiéQIiIfi) ...............................
PANEL LAYOUT (/VaHM/vfi) b)
BLOCK DIAGRAM (712; 7 5H 775/9 -------
CIRCUIT BOARD LAYOUT (1:7 |~ V477 h)"
CIRCUIT BOARD WIRING (/- bfifififiI)"
DIMENSIONS (diifiI) ~~~~~~~~~
DISASSEMBLY PROCEDURE (fififi-$II§)
IC BLOCK DIAGRAM (10 7'13 77-) """""""""
CAUTION FOR SPEAKER CONNECTION

(X 5-7] -§fii®;§=§) ............................ 15
TROUBLESHOOTING
(imfifififfimlfifitflfifii U1§E¥EE§®§MH ------
PERFORMANCE GRAPHS (fi'lfiI) """"""""""
CIRCUIT BOARDS (9... bgmm) ..........................
ADJUSTMENTS (fig) ............................................... 25/28
PARTS LIST

LM YAMAHA CORP.

HAMAMATSU, JAPAN
3K-IZ3 @ Printed in Japan 32.03

P4050

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P4050

P4050

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 iniury, destruction of expensive components and failure of the
product to perform as specified. For these reasons, we advise all Yamaha product owners
that all 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, 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 changes in specification are subject to change without
notice or obligation to retrofit. Should any discrepancy appear to exist, please Contact the distributors
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: Turn the unit OFF during disassembly and parts replacement. Recheck fl work before
you apply power to the unit.

j

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 REASON WHAT SO EVER!

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

If you come in contact with solder or components located inside the enclosure of this product,
wash your hands before handling foodi