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SERVICE MANUAL
YDP-131 YDP-131C
s CONTENTS
SPECIFICATIONS 3/4
PANEL LAYOUT 5
DISASSEMBLY PROCEDURE 6
LSI PIN DESCRIPTION 21
IC BLOCK DIAGRAM 23
CIRCUIT BOARDS 24
TEST PROGRAM 32/37
BACKING UP DATA AND INITIALIZING THE SETTINGS
42/43
TRANSMITTING SONG DATA BETWEEN THE COMPUTER
AND YDP-131/YDP-131C
44/45
MIDI IMPLEMENTATION CHART .......................................... 46
MIDI DATA FORMAT ............................................................. 47
PARTS LIST
BLOCK DIAGRAM
CIRCUIT BOARD LAYOUT & WIRING
OVERALL CIRCUIT DIAGRAM
PK 000398
20060801- Copyright (c) Yamaha Corporation. All rights reserved. PDF '06.08
YDP-131/YDP-131C
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 : 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 principal-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 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 bus in the unit (heavy gauge black wires
connect to this bus).
IMPORTANT : Turn the unit OFF during disassembly and parts replacement. Recheck all work before you apply
power to the unit.
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, ELECTRICAL/ELECTRONIC OR 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 vapor!
If you come in contact with solder or components located inside the enclosure of this product, wash your hands before
handling food.
s WARNING
Components having special characteristics are marked Z and must be replaced with parts having specification equal to
those originally installed.
Z
s SAVING DATA
Saving and backing up your data