Yamaha fx900 effects processor service manual

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SlMUL-EFFECT PROCESSOR

FX900

SERVICE MANUAL

K'K

ICONTENTS (5:52)

: SPECIFICATIONS (mggfiifi) .............................................. 2

f PANEL LAYOUT (/Y*}I/I/r7'7 l~) 4
BLOCK DIAGRAM (7s /79477-7A) -------------------------- 5

CIRCUIT BOARD LAYOUT (1:7 I 1/477 I)
DISASSEMBLY PROCEDURE (9%$JE) """""
LSI PIN DESCRIPTION (LSIfiRRCIfifiEfi) ~~~~~~~
IC BLOCK DIAGRAM (107C! /7.) """""""
CIRCUIT BOARDS (>- Igflil) ~~~~
TEST PROGRAM (-72 I 7D 75A)
CHECKS & ADJUSTMENTS (Ififitifiig) -----
MIDI DATA FORMAT (MIDI 7"-77>r-7y b)
MIDI IMPLEMENTATION CHART """""""""""""""
PARTS LIST

HAMAMATSU. JAPAN
2,914K-035 @ Printed in Japan 'BUIOB

FX9OO

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FX9OO

FX900

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 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: Staticdischarges 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 a_ll 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.

0 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,

ADVARSE L!
Lithiumbatteri. Eksplosionsfare.
Udskiftning m5 kun foretages af en sagkyndig, og som beskrevet i servicemanualen.

no...

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, ELECTRlCAL/ELECTRONIC 0R 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 food.