Yamaha ad824 ad converter service manual

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AD CONVERTER

AD 824

SERV E MANUAL

This document IS printed on chIoIme Iree (ECF) paper wIth soy Ink.

l CONTENTS

SPEC'FICATIONS .................................................................... 3
PANEL LAYOUT ------------ 5
ClRCUlT BOARD LAYOUT ...................................................... 6
DlMENTIONS ........................................................................... 8
BLOCK DIAGRAM ---------------- 9
DISASSEMBLY PROCEDURE - 1o
LSI PIN DESCRIPTION -------- - 14

IC BLOCK DIAGRAM
CIRCUIT BOARDS -

'16
'19

INSPECTION ---------- - 36
TEST PROGRAM ---------- - 39
FLASH ROM UPGRADE -- - 43
ERROR MESSAGES .............................................................. 45
PARTS LIST

OVERALL CIRCUIT DIAGRAM

PA

200006'5150000

.YAMAHA

HAMAMATSU, JAPAN
1.45K-9731 K @ Primed in Japan '00.07

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AD824

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 lollow 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 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. 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 a_|| 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. Obsen/e the following
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.

ADVARSEL!

Lithiumbatteri-Eksplosionsfare ved fejlagtig handtering. Udskittning ma kun ske med batteri at samme fabrikat og type. Levér det
brugte batteri tilbage til leverandoren.

VARNING

Explosionsfara vid felaktigt batteribyte.

Anvand samma batterityp eller en ekvivalent typ som rekommenderas av apparattillverkaren.

Kassera anvant batteri enligt tabrikantens instruktion.

VAROITUS

Paristo voi rajahtaa, jos se on virheellisesti asennettu.

Vaihda paristo ainoastaan Iaitevalmistajan suosittelemaan tyyppiin.

Havita kaytetty paristo valmistajan ohjeiden mukaisesti.

The following information complies with Dutch Official Gazette 1995. 45; ESSENTIALS OF ORDER ON THE COLLECTION OF
BATTERIES.

- Please refer to the diassembly procedure for the removal of Back-up Battery.
- Leest u voor het verwijderen van de backup batterii deze beschriiving.

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.

I WARNING

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