Yamaha ad8 hr

Page 1

AD CONVERTER WITH REMOTE PREAMP

AD8HR

SERVICE MANUAL

ICONTENT$I [I I] [I

SPECIFICATIONS] n n a a I] .................................................. 3
DIMENSIONS [I [I I] D .................................................. 6
PANELLAYOUTDDDDDDDDDD .................................... 7
CIRCUIT BOARD LAYOUTI] a a a I] I] [I a a a I] ................. 8
DISASSEMBLY PROCEDURED I] a [I [I [I .............................. 9
LSI PIN DESCRIPTIONI] LSID I] I] n I] n .............................. 13
IC BLOCK DIAGRAM] |C[| a I] n a...

CIRCUIT BOARD] n n [I [I D n

GAIN SETUPEI GAIND

TEST PROGRAM] |] [I I]

INSPECTIONS] I] [I [I

UPGRADED [I I] [I [I
ERROR MESSAGES] [I
PARTS LIST

BLOCK DIAGRAM] [I [I
CIRCUIT DIAGRAM] [I [I [I El

PA .YAMAHA

HAMAMATSU, JAPAN
200403-260000 Copyright (C) Yamaha Corporation. All rights reserved PDF-K6341 m 93H 04.03

Page 2

AD8HR

IMPORTANT NOTICE

This manual has been provided for the use of authorized Yamaha Fletailers and their service personnel. It has been assumed that basic
service procedures inherent to the industry, and more specilically Yamaha Products, are already known and understood by the users,
and have theretore 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 principalragent relationship ot any form.

The data provided is belived 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 subyect 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 LII 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 OFI PLASTIC COMPONENTS IN YOUR MOUTH FOR ANY FIEASON WHAT SO EVEFII

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.

LITHIUM BATTERY HANDLING

This product uses a lithium battery for memory backrup.
WARNING : Lithium batteries are dangerous because they can be exploded by improper handling. Observe 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 disasemble the batteries.

Never heat batteries or throw them into lire.

ADVARSEL!

LithiumbatterirEksplosionsfare ved fejlagtig handtering. Udskiltning ma kun ske med batleri af samme fabrikat og type. lever det brugte batten tilbage

til leverandren.

VARNING

Explosionsfara vid lelaktigt batteribyte.

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

Kassera anvant batteri enligt fabrikantens instruktion.

VAROITUS

F'aristo voi rajahtaa, yos se on virheellisesti asennettu.

Vaihda paristo ainoastaan laitevalmistajan suosittelemaan tyyppiiin.

Havita kaytetty paristo valmistajan ohjeiden mukaisesti.

The Iollowing 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 Backrup Battery.
- Leest u voor het verwijderen van de backup batterij deze beschrijving.

DDDDDDDDDDD

DDDEI
0 DDIIIDIIIEIDEIDDDDDDDDDEIEIDIIIDDDDIIIEIDIIIDDDDDDDDDDDDDDDDDDDDDDDDDD[ID
DEIDDEI

I WARNING

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

ADDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDEIEIEIEIDDDDDDDDDDDDEIEIEIEI