5.
MAINTENANCE
AND
INSPECTION
5-1. How to replace the sensor
potentiometer
set
If the
sewing
speed of the machine decreases suddenly or the machine stops whilethe front part of the pedal is
depressed,replaceit because it has reachedend of its
service
life. There are two types of the pedal sensorsA and
Basshown in Fig.
5-1
(a) and (b). However, they are different from each other only in their pedalingsprings,so
replace
them
the
same way.
(a) Pedal sensor type A
(for AK-30, AK-33)
qDOOCSD.
Fig.
5-2
Fig. 5-4
• a
•
'6^,
I
iponi
Fig.
5-3
Fig. 5-1
(b)
Pedal sensor
type
B
(for AK-31,AK-34)
1) Remove the front cover setscrew (Fig. 5-2 O ) in the
PSC
box,
and open the front cover.
2) Disconnect the 6P connector of the sensor potentiometer
set (Fig. 5-3 O ) from the main circuit board. (The
locking device is installed in the
connector
housing, so
push
it
open
by
hand,
and pull it
out.)
3) Remove the FG cord
of
the pedal (Fig. 5-3 O ) screwed
on
the
main
frame.
4) Removethe pedal connecting bar (Fig. 5-4 O ) from the
pedal lever (using two spanners for MIO).
5) Remove the four screws attaching the pedal sensor (Fig,
5-4 d ), then remove the pedal sensor set from the
PSC
box.
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