3) Transistor citcuit boards assembly [M42013010A0]
Fig.
5-14
(1) Pushup latch O to open
PSC
box top
cover
O andupperright transistor
circuit board cover assembly O .
(2) Next, pull the transistor circuit board
. assembly corresponding to the
location
of
the malfunction up and out.
[BR=
O (onlyin the
case
of
Company
H),
FL= 0 (only in the caseof the machine
providedwith an AK),
WP=
0 ,
TRM=
O ,
TL-PC-BT=©,BT=© ]
(3) Next, pass a new transistor circuit board
assembly through the slit in
the
PSC
box
top cover and fit securely
onto
power
supply circuit board A and B assemblies,
(4) Last,fit transistor circuitboard group
protrusion 0 to
PSC
box top cover
guide 0 , close the cover, and lock
the latch to complete the replacement.
It position at which the transistor is to be pushed in, marked by a
symbol
on the front riglitpart of the power
supply circuit board inside the opened front cover.
BR braketransistor(onlyin the
case
of
Company
H)
FL presser foot lifter transistor
WP wiper transistor
TRiM
:
thread
trimmer
transistor
BT'PC'TL
: Top feed lifter transistor
BT : backtack (reverse feed) transistor
-
56
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