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IJITPORTANT NOTICE
This manual has becn
providcd
for
the
use
of authorized
Yamaha
Retailers and their service
personnel.
It has
been assumed that basic servicc
proccdures
inhcrant to the industry, and more
specifically
Yamaha
Products, are alrcady known
and
understood
by the
users,
and
have
thereforc
not
been rcstatcd.
WARNING: Failure to
follow
appropriate service and safety
procedures
whcn
servicing this
product
may result in
personal
iniury, dcstruction of expcnsivc components
and
failure
of the
product
to
perform
as specificd.
For
thesc reasons, we advisc all
Yamaha
product
owners
that all servicc required should be
performed
by an authorizcd Yamaha Retailer or
the
dppointed
rer vice
reprerentativc.
IMPORTANT:
The
prescntation
or
salc
of this manual to any individual
or
firm
does not constitute
authorization, ccrtification,
recognition
of any applicable
technical capabilitites, or
establish a
principle
agent relationship of any form.
Thc data
provided
is belicved to
be accurate and applicable to the
unit/s
indicatcd on the covcr.
The
rcscarch, engineering, and
scrvice
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 obliSation to retrofit. Should any discrepancy appcar to exist,
please
contact the distributor's
Servicc
Division.
Static dischargcs can destroy experrsive components. Discharge
any static electricity
your
body may have
accumulated by
grounding
yourself
to the
ground
buss in the unit
(heavy
gauge
black
wires
connect to this buss).
Turn the
unit
OFF during disassembly and
parts
replacement. Recheck
all
work
before
you
apply
power
to th€ unit.
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CONTENTS
TOSERVICEPERSONEL
........1
REARPANELS... .....1
BLOCKDIAGRAM ......2
SPEC|F|CAT|ONS.
......3
INTERNALVIEW. ......3
DISASSEMBLYPROCEDURES . .....
4-6
MECHANICALADJUSTMENTS. 7
-9
ELECTRICALADJUSTMENTS . ....9-11
LSI DATA
TABLES
12
TIMINGCHART .......13
PRINTED
CIRCUIT
BOARD
(Pattern
Side)
.
.
14
-
17
wtRtNG .. .. .. . 18
fcBLocK
..19-21
SCHEMATICDIAGRAM
.....22,23
PARTSLTST.
.24-36
SINCEI'87
@YAMAHA
NIPPON GAKKI CO., LTD. HAMAMATSU,
JAPAN
2.5k 533
El
@
Printed in Japan.
'85 . I
_ ..1
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