Yamaha ew20 electronic wood wind service manual

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ELECTRONIC WOOD WIND

M L Second Edition

Tone Generator

Comroller

ICONTENTS (Elk)

SPECIFICATIONS (figgttfi) ....................................... 2
PANEL LAYOUT (/\:fi)|,|/»f7rj h) ............................. 3
CIRCUIT BOARD LAYOUT (1:7 I 1/4 7'7 I) -------- 5
BLOCK DIAGRAM (7'D~y757"f77-3'A) -- 6
LSI PIN DESCRIPTION (LSI fi¥1flfifii§) ~~~~~~~~~~~~~~~~ 7
|C BLOCK DIAGRAM (IC7'EI77I) .......................... 9
DISASSEMBLY PROCEDURE (fifi¥¥llfi) -------------------- 10
TEST PROGRAM (-7-;{|~ju75/_\) ........................... 14
MIDI IMPLEMENTATION CHART ---------------------------- 16
CIRCUIT BOARDS (V-lgfii.) ---------------------------- 17
PARTS LIST

YAMAHA CORP.

HAMAMATSU. JAPAN
1.26K202KPrinted in Japan '901

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EWZO

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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 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 ofany 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 distributor's
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.

This product uses a lithium battery for memory back-up,

WARNING: Lithium batteries are dangerous because they can be exploded by improper handling,
Observe the following precautions when handling or replacing lithium batteries

0 Leave lithium battery replacement to qualified service personnel.

Always replace with batteries of the same type.

When installing on the PC board, solder using the connection terminals provided on the battery cells
Never solder directly to the cells Perform the soldering as quickly as possible.

Never reverse the battery polarities when installing

Do not short the batteries,

Do not attempt to recharge these batteries

Do not disassemble the batteries.

Never heat batteries or throw them into fire.

ADVARSEL!
Lithiumbatteri. Eksplosionsfare.
Udskiftning ma kun foretages af en sagkyndig, 0g som beskrevet i servicemanualen.