Yamaha acd 1

Page 1

AMPLIFIER CONTROL DEVICE

ACD 1

SERVICE MANUAL

l CONTENTS (E :2)

SPECIFICATIONS (fiat/$5) ....................... 4/5 INITIALIZATION FOR FACTORY SHIPMENT SETUP
DIMENSIONS (Tr/El) ..................................... 6 (.Tfiflifi/fi r : 9 T 5 r 7:) ...................... 88/89
CIRCUIT BOARD LAYOUT (12 v |~ w 77 I) .. 6 FORMATTING (7 7r -7 y I) .................. 90/91
PANEL LAYOUT (/\"?~)l«l/f7"7 I~) ....7 TROUBLESHOOTING
WIRING (Ema/ail) ................................ ....8 (Hi/wl-TY >7) ......................... 92/93
DISASSEMBLY PROCEDURE (fififima) ....... 9 SEQUENCE WHEN POWER IS TURNED ON
LSI PIN DESCRIPTION (LSI fi?%§§i-��) ...... 15 ($5EE§b>-#>z) .................................. 94/95
IC BLOCK DIAGRAM (IC 7:1 '7 7|) ........... 18 PARTS LIST
CIRCUIT BOARDS <9- Igffi.) ................ 22 BLOCK DIAGRAM <7D v 7 5M 775/0
TEST PROGRAM fix I~ in 75/» ...... 32/47 CIRCUIT DIAGRAM HEIRS.)
UPDATING (7v 7?- I~) .......................... 62/75

PA .YAMAHA

200910-262500

HAMAMATSU, JAPAN
Copyright (C) Yamaha Corporation. A righs reserved. PDF M IDLE '09.1D

Page 2

ACD1

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, de-
struction 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 iirm does not constitute authorization certification, recog-
nition of any applicable technical capabilities, or establish a principal~agent relationship ol any form.

The data provided is belived to be accurate and applicable to the unitfs) indicated on the cover. The research engineering, and service
departments of Yamaha are continually striving to improve Yamaha products. Modiiications 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 : 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 in work before you apply power to the unit.

WARNING: This product contains chemicals known to the State of California to cause cancer, 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]
llux vapor!

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

IMPORTANT NOTICE FOR THE UNITED KINGDOM
Connecting the Plug and Card
WARNING : THIS APPARATUS MUST BE EARTHED IMPORTANT. The wires in this mains lead are coloured in accordance with the following

code:
GREEN»AND-YELLOW : EARTH
BLUE : NEUTRAL
BROWN : LIVE

As the colours of the wires in the mains lead of this apparatus may not correspond with the coloured markings identifying the terminals in your plug
proceed as follows:

The wire which is coloured GREEN»andrYELLOW must be connected to the terminal in the plug which is marked by the letter E or by the safety earth
symbol @ or colored GREEN or GREENrand-YELLOW.

The wire which is coloured BLUE must be connected to the terminal which is marked with the letter N or coloured BLACK.

The wire which is coloured BROWN must be connected to the terminal which is marked with the letter L or coloured RED.

- This applies only to products distributed by Yamaha Music UK. Ltd. (3 wires)

IWAFINING

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

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