Yamaha stagepas 300 service manual

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PORTABLE PA SYSTEM

STAGEPAS 300

SERVICE MANUAL

Speaker Mixer Speaker

I CONTENTS[] [I I] [I

SPECIFICATIONSEI I] [I [I [I [I
PANELLAYOUTEI I] [I I] I] I] I] [I
DIM ENSIONsI] [I [I a [I ...........
CIRCUIT BOARD LAYOUTEI [I a [I I] [I [I
DISASSEMBLY PROCEDURED [I [I [I [I [I .
IC BLOCK DIAGRAMI] mg [I [I I] [I [I .........
CIRCUIT BOARDSD [I I] [I [I [I [I [I .....
INSPECTIONSEI I] I] I] .............................................
TROUBLE SHOOTINGDDDDDDDDDDDDD ............ 26
PARTS LIST

BLOCKDIAGRAMEIDEIEIDEIEIDEIEIEIEIEI
CIRCUIT DIAGRAMD [I an [I

PA .YAMAHA

2005032186100 HAMAM ATSU, J APAN
Copyright (c) Yamaha Corporation. AII rights reserved. PDF-K9611 m (1. '05.04

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STAGEPAS 300

IMPORTANT NOTICE

This manual has been provided for the use of authorized Yamaha Retailers and their service personnel. It has been assumed that bastc
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 ot 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: This 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 principalragent relationship ot any form.

The data provided is belived 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, theretore. inevitable and changes in
specification are subject to change Without notice or obligation to retrofit. Should any discrepancy appear to exist, please contact the
distributor's Service DIVISlon.

WARNING : Static discharges can destroy expensive components. Discharge any static electricity your body may have accumulated
by grounding yourself to the ground bus in the unit (heavy gauge black wires connect to this bus.)

IMPORTANT : Turn the unit OFF during disassembly and parts replacement. Recheck a_ll work before you apply power to the unit.

WARNING: CHEMICAL CONTENT NOTICE!

The solder used in the production ot 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 SOLDEFI, ELECTRICAL/ELECTRONIC OFI PLASTIC COMPONENTS IN YOUFI MOUTH FOR ANY REASON WHAT SO EVEFIi

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.

|MPORTANT NOT|CE FOR THE UN|TED KINGDOM As the colours of the wires in the mains lead ot this apparatus may not
Connecting the Plug and Card correspond with the coloured markings identifying the terminals in your plug
proceed as follows:
WARN'NG= 5 APIAHNUS MUST BE EARTHED _ The wire which is coloured GREENrandrYELLOW must be connected to the
IMPORTANT The W'Ies 'n "5 mains lead are coloured 'n accordance terminal in the plug which is marked by the letter E or by the satety earth
W'lh "9 f°°9 mdei symbol Q or colored GREEN or GFlEENrandrYELLOW.

GHEENANDYELLOW : EARTH The wire which is coloured BLUE must be connected to the terminal which is
BLUE 1 NEUTRAL marked With the letter N or coloured BLACK.
BROWN 2 LIVE

The wire which is coloured BROWN must be connected to the terminal which is
marked with the letter L or coloured FlED.

~ This applies only to products distributed by YamaharKemble Music (U.K.) Ltd.

IWARNING

Components having special characteristics are marked & and must be replaced with parts having specification equal to those
originally installed.

$DDDDDDDDDUDDDDDDDDEIEIEIEIDDUDDDDDDDDDDEIEIEIEIUDDDDDDDDDDDEIEIEI

(3 wires)