Yamaha spx90 service manual

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YAMU-00379

DIGITAL SOUND PROCESSOR

SPXQO

INFO-CENTER

ICONTENTS

SPECIFICATIONS . . . ............................ 1
BLOCK DIAGRAM ............................... 1
PANEL LAYOUT ................................ 2
ROOM SIZE CHART ............................. 3
SIGNAL FLOW .................................. 4
PRESET PROGRAM LIST ......................... 5
CIRCUIT BOARD LAYOUT ....................... 7
CHECKS AND ADJUSTMENTS ..................... 8
TEST PROGRAM ................................ 9
MIDI DATA FORMAT ............................ 11
LSI DATA TABLE ............................... 13
CIRCUIT BOARDS ............................... 15
PARTS LIST

.YAMAHA

NIPPON GAKKI (30., LTD. HAMAMATSU, JAPAN

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OBXdS

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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 inherant tothe 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 of any form.

The data provided is believed to be accurate and applicable to the unitls) 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 subiect 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 componentwischarge 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. Rechecka_||work before
you apply power to the unit.