Yamaha mu 90r

Page 1

TONE GENERATOR

ENAMEL-IR
-

YIIII'I m M
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I CONTENTS (5 Z!)
SPECIFICATIONS (fiat/IE) .................................................. 2/3
PANEL LAYOUT (Hz/WT 7'7 I~) ......................................... 4
CIRCUIT BOARD LAY_OUT(:L:~y I~ W777 I~) ...................... 5
BLOCK DIAGRAM (71: 7 7747775A) ................................ 6
DISASSEMBLY PROCEDURE (fififla) .................................. 7
LSI PIN DESCRIPTION (LSI%¥¥&§E§) .................................. 11
IC BLOCK DIAGRAM (107:! -y 7I) ....................................... 14
TEST PROGRAM (72 F 7:1 7 a A) ................................. 16/25
MIDI/COMPUTER CONNECTING CABLES
(3)t19}§fi771|¢-��39b{) .................................. 22/31
ERROR MESSAGES (I a - x v t - 9) ............................ 23/32
INITIALIZE (4 : 9 *I 5 4 1) ............................................... 24/33
MIDI DATA FORMAT (MIDIFJ- 7 7 7r - 7 ., |~) ...................... 34
EFFECT PROGRAM LIST (I 7 I 7 I~ 7I:I 7514') x H ....... 57
EFFECT PARAMETER LIST (I 7 I 7 IVY? x - 7 U x F)....63
MIDI IMPLEMENTATION CHART ............................................. 7o
CIRCUIT BOARDS (>- biI/il) ........................................... 72
OVERALL CIRCUIT DIAGRAM (fililfigl) ............................... 75
PARTS LIST

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SY YAMAHA CORR

HAMAMATSU, JAPAN
19970210-79000 1.96k-676 @ Printed in Japan '97.03

Page 2

MUSOR

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 under--
stood 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 per.-
sonal 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: This presentation or sale of this manual to any individual or firm does not constitute authorization, certifi-
cation, recognition of any applicable technical capabilities. or establish a principal-agent relationship of
any form.

The data provided is belived to be accurate and applicable to the unitlsi 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 you body may have
accugnulated by grounding yourself to the ground buss in the unit (heavy gauge black wires connect to
this uss.

IMPORTANT: Turn the unit 95E during disassembly and parts replacement. Recheck a_ll work before you apply power-
to the unit.

LITHIUM BATTERY HANDLING

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 follow--
ing precautions when handling or replacing lithium batteries.

Leave lithium battery replacement to qualified service personnel.

Always replace with batteries of the same type.

When installing on the PC board by soldering, 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.

ADVARSELI

Lithiumbatteri-Eksplosionsfare ved leilagtig handtering. Udsklftning ma kun site med batteri af samme fabrikat 09 type. Lever
det brugta batteri tilbage til leveranderen.

VARNING

Explosionsfera vid felaktigt batteribyte.
Anvand samme batterityp eller en ekvivalent typ som rekommenderas ev apparattillverkaren.
Kassera anvant batteri enligt fabrikentens instruktion.

VAROITUS

Paristo voi rajamaa, jos so on virheellisesti asennettu.
Veihde paristo ainoastaan Iaitevalmistajan suosittelemaan tyyppiin.
Havita kaytetty peristo valmistajan ohjeiden mukaisesti.

gngolgigéng information complies with Dutch Official Gazette 1995. 45; ESSENTIALS OF ORDER ON THE COLLECTION OF2
E .

- Please refer to the diassembly procedure for the removal of Backsup Battery.
- Least u voor het verwijderen van de backup batterij daze beschrijving.

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.

(5)8 ESJRIILACE SOLDER, ELECTRICAUELECTRONIC OR PLASTIC COMPONENTS IN YOUR MOUTH FOR ANY REASON WHAT

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

if ygu come in contact with solder or components located inside the enclosure of this product. wash your hands before handling
00 .

I WARNING

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

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