Yamaha md4 recorder service manual

Page 1

MULTITRACK MD RECORDER

MELI-

l CONTENTS (E &)
DISCS FOR MD4(MD4Tfii6§-4 17) ................................. 4

SPECIFICATIONS (fiSIiIE) ................. 5/6

PANEL LAYOUTUWJI/IMTD I) .. ...7
DIMENSIONS (Trail) ............................................................... 9
BLOCK DIAGRAM (MAIN CIRCUIT)
(MAINx-b7El-y'79'477'51a) ..................................... 1o
BLOCK DIAGRAM. (MIXER PART) , »
(STv-EBO7D-y7747jim ................................... 11

SIGNAL FLOW CHART «ES-mam ......
CIRCUIT BOARD LAYOUT (12v I~ 1/4 7 '7 b . .
DISASSEMBLY PROCEDURE (magma) ................................
MD4 UNIT DISASSEMBLY AND ASSEMBLY PROCEDURE
(WM 721: y I~ wfifiitfmfiflfi) .................................. 18
LSI PIN DESCRIPTION (LSlfifi%¥#&§E§) ' .

IC BLOCK DIAGRAM (IC 7:1 ~y 7|) .. ....33
CIRCUIT BOARD (9- LEW.) ....35
ERROR MESSAGES (I 5 - x y +2 50/51
ADJUSTMENT (REE) ....................... ...52/63
MIDI IMPLEMENTATION CHART ....78
CIRCUIT DIAGRAMS MEIER.) .................................................. 79
PARTS LIST

PA \ L YAMAHHADIAEQEFI

1996061599800 2.685K-996 0: Printed In Japan '96.8

Page 2

MD4

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 injuw, dustruction 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 sen/ice
representative.

IMPORTANT: This presentation or sale of this manual to any individual or furm does not constitute authori-
zation, certification, recognition of any applicable technical capabilities, or establish a princi-
pal-agent relationship of any form.

The data provided is belived 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. Modifi-
cations 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 didtributor's Service Division.

WARNING: Static discharges can destroy expensive components. Discharge any static electricity you
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 O_FF during disassembly and parts replacement. Recheck a_|| 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 treaces 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 EVERI

Avoid prolonged, unprotected ccntace between solder and your skin! When soldering, do not inhale solder
fumes or expose eyes to solder/flux vaporl l

If you come in contact with solder or components located inside the enclosure of this product, wash your hands .
before handling food.

I WARNING

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

AEDUDE'inElzt figififiéétwliifitifififizé'fi KEiflTéififim fiéwtw%ffifiwfifi§1EZfifiTébo