Yamaha EQ-630 Service Manual page 39

! , " .
~
No.
= . .
135H
Effccti.ve
.Da,t~.:
.
·Septembe.~
27
J
1989
MODEL:
EQ'-630/Ti
STEREo GRAPHIC
EQUALIZER
SERIAL r-WMBERS AFFECTED: Units
under
Serial
N~~ber ~~99~---~­
(released before
Septerr~ber
26
~
1989)*
rJNCTIONS AFFECTED: MEMORY BACKmUP
BATTERY
!~lfE
OF
Clt~NGE
t-t~NDATOR'{
·
OPTIC;NAL FOR
INFO
ONLY
o
D 0
(This modification is to be petformed
on all
store~stock
and customer-units
not already
modified
by
y~v~HA or an
authorized y~~~~
Preferred Customer
Service Cente1;.)
S'"iM?I'OM:
w~en the
At-mains pC'wer
is
disconnectt?d,
uset,-set equaliza~ion curves.
the
unit any
CAUSE:
-.tNOTE:
The 3 volt lichi'. . u-n,
mG'.ffior:l
b.)ck-~".ip
batte:t-y' has
failE~d d~~e
::0
e:-
cu~rent-d~ain
whenever che
ACNnains
power is disconnected .
. Mo;~ifvthe' · · . .
'mctioi·v·-
ba.ck:·u~ c::'r~\.;.i'-.
t.o'
reduce'
cur'rent-dra~":i then
i
~ ~
.
remove and replace the lithium batcery (as described on the reverse
side of this bulletin).
All
unlCS
released after Septemb~t 26~ 1989, include this modifica~
tian',,,
~~ny
units
rnQdified
by
Yl.1J·{~~J-Lf\
before this
d.~:~
ha""e a green
mark next
to
th€ ·St·rial
~~:..tmb+lr
and a
g<)ld
Q. .
C'.
-..:;;:icker. on the
carton-box-
(See reverse side for procedure to modify che memory
back-up circui.t: and
rcpl~tce
the lithium batte:-y.)