' .
NO.
IN
CHAPTER
8
PROBABLE
CAUSES
REPLACEMENT
FLOWCHART
AND
CHECK/
ADJUSTMENT
I
REPAIR
ERROR
STATUS
PARTS
#5
1.
Presser
plate lifter
If
the
presser
plate automatically lowers
or
Presser
plate
The
presser
plate
switch defective
rises
when the power
is
turned
OFF
or
ON,
lifter switch
will
not lower
respectively,
without
any
other operator
assembly
when the
presser
action
to
the machine, the
presser
plate
(2-stage
plate lifter switch
lifter
switch
is
defective.
If
the
presser
plate
switch)
is
stepped on. once lowered by stepping on the
presser
plate
lifter
switch
rises
by
releasing
it,
the
presser
plate lifter switch
Is
d~fective.
#6
1.
Start
foot
switch
(a)
If
nothing shifts
at
all, reinsert connector
Start
foot
;.
·~--
The
presser
plate
and
its cab I e
P1
of
the main circuit board
and
switch
will
not
return
to
defective
connedorsJ&andP&oftheconttolbo~
its home position
(First
(b) Unplug connector
P6
of
the control
box,
when the start
~1~
then
check
it
for
contl nuity.
If
the
foot switch
Is
: Presser
measured
value
Is
not both the
r
following specified
values,
the start foot
stepped on.
!(Second
J
Switch)
switch or its
cable
is
defective:
co
0
or
00
Start
when
the
start foot switch
is
off
or
on,
P6
respectively.
2.
Home position
(a)
If
the
presser
plate
moves
in the
reverse
Home
position
signal error
direction
and
its motion
is
erratic, the
PCB
home position
signal
is
incorrect.
(b)
Reinsert
connector P12
of
the control
circuit board, connectors
J3
and
P3
of
the control
box,
and
connectors J
12
and
P12
of
the machine
head.
(c)
Press
EMERGENCYSTOPswitchtwice,
then operate the feeding
mechanism
by
hand.
If
the
LED
on the home position
PCB
does not flicker when the feeding
mechanism
approaches
the
home
position, the home position signal
is
incorrect.
(d)
Check
if
the
sensor
(particularly,
Y-home
position
sensor)
on the home position
PCB
is
subject
to
any light.
If
yes, protect
the
sensor
from the light.
(e)
Oean
X-axis
home position dog.
3.
Fuse
blown
Remove
fuse
No.3,
then
check
it
for
Fuse
1SA
continuity.
If
there
is
no continuity, replace
the
fuse.
-19-
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