Brother BAS-340 - Page 82

NO. IN CHAPTER 8
PROBABLE
REPLACEMENT
REF.
FLOWCHART AND
CHECK/ ADJUSTMENT I REPAIR
ERROR STATUS
CAUSES
PARTS
PAGE
#16
3. Thread
{a)
Referring to 2-3
"Checking solenoid's
Thread
The thread cannot
trimming
voltages" {P 57}, measure the resistance. If
trimming
be cut. solenoid or
it is not approx. 10n, the thread trimming
solenoid
its cable
solenoid
is defective.
assembly
57
defective
#17
1.Synchronizer
If the needle stop position varies at random
The needle does not adjusted each the machine operation is complete,
not stop at the top
properly
adjust
the needle stop signal issuing timing.
end position after
the thread is cut.
2.Control PCB
Replace the cotrol PCB.
Control PCB
57
defective
#18
Refer to # 12. {p 78)
The machine
cannot sew
patterns
as
programmed.
#19
1. EMERGENCY
(a)
Unplug connector P12 from J12 of the
EMERGENCY
The operation will
stop button machine bed, then check it for continuity.
stop
button
not stop if the or its cable If the resistance is not the following
assembly
EMERGENCY stop
specified value, the emergency stop
button is pressed. button assembly is defective;
J~
Between pins 1 and 3: On or oon
when the EMERGENCY stop button is
OFF or ON, respectively.
Between pins 2 and
3: oo n or on
u
when the EMERGENCY stop button is
OFF or ON, respectively.
#20
Refer to #16 and #17.
The thread cannot
be
cut after the
emergency stop
state is cancelled.
#21
1. STEP BACK
(a)
Unplug connector
P3 of the control PCB,
The STEP BACK
switch or its
then check the operation panel harness
switch
is cable
conenctor
for continuity. If the measured
inoperative. defective
value is not the following specified
resistance, the operation panel PCB is
~·
defective.
90
Between pins B1 and B9; normally oon
3
When the STEP BACK switch is ON, it should
be on.
#22
Refer
to #12 and #13.
The machine stops
78
sewing
operation
in midstream.
-79-
From the library of: Superior Sewing Machine & Supply LLC