Brother International MD-817 Service Manual - Page 52

Malfunction

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ITEM PROBLEM CHECK PROBABLE CAUSE REMEDY #19 Start backtacking is impossible. Malfunction of the control Replace the control box. printed-circuit board. #20 Will not perform • Is it correct when the back- start backtacking tack stitch count is the set number of changed and you try again? stitches. (YES) Malfunction of the operation Replace the operation box. box. (NO) Malfunction of the control Replace the control box. printed-circuit board. (Note that care must be taken because there is a dirference in stitch length depend- ing on whether the stitch pitch is forward or reverse.) #21 Will not operate at high speed after start backtacking. #22 Start backtacking resumes. Malfunction of the control Replace the control box. printed-circuit board. Malfunction of the control Replace the control box. printed-circuit board. #23 Will not sew at high speed after start backtacking. Malfunction of the control Replace the control box. printed-circuit board. #24 Will not perform end Same as #19. backtack. Same as #19. Same as #19. #25 Will not perform end Same as #20. backtack set stitch count. Same as #20. Same as #20. #26 Needle (upper), thread trimmer and thread wiper will not stop after end backtacking. Malfunction of the control Replace the operation box. printed-circuit board. #27 Will not perform • Is it possible when the fixed-stitching at low fixed-stitch count is speed. changed and you try again? (YES) Malfunction of the operation Replace the operation box. box. (NO) Malfunction of the control Replace the control printed- printed-circuit board. circuit board. #28 Will not trim thread after fixed-stitch sewing. Malfunction of the operation Replace the operation box. box. Replace the control printed- circuit board. #29 Will not perform continuous backtacking. Malfunction of the control Replace the control box. printed-circuit board. #30 Will not trim thread after continuous backtacking. Malfunction of the control Replace the control box. printed-circuit board. #31 Will not perform one-stitch correction. Malfunction of the control Replace the control box. printed-circuit board. #32 Will not start slowly. Malfunction of the control Replace the control box. printed-circuit board. - 48 -

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ITEM
PROBLEM
CHECK
PROBABLE
CAUSE
REMEDY
#19
Start
backtacking
is
impossible.
Malfunction
of
the
control
printed
-circuit
board.
Replace
the
control
box.
#20
Will
not
perform
start
backtacking
the
set
number
of
stitches.
(Note
that
ing
on
whether
•
Is
it
correct
when
the
back
-
tack
stitch
count
is
changed
and
you
try
again?
(YES)
(NO)
care
must
be
taken
because
there
the
stitch
pitch
is
forward
Malfunction
of
the
operation
box.
Malfunction
of
the
control
printed
-circuit
board.
is
a
dirference
in
stitch
length
or
reverse.)
Replace
the
operation
box.
Replace
the
control
box.
depend-
#21
#22
Will
not
operate
at
high
speed
after
start
backtacking.
Start
backtacking
resumes.
Malfunction
of
the
control
printed
-circuit
board.
Malfunction
of
the
control
printed
-circuit
board.
Replace
the
control
box.
Replace
the
control
box.
#23
Will
not
sew
at
high
speed
after
start
backtacking.
Malfunction
of
the
control
printed
-circuit
board.
Replace
the
control
box.
#24
Will
not
perform
end
backtack.
Same
as
#19.
Same
as
#19.
Same
as
#19.
#25
Will
not
perform
end
backtack
set
stitch
count.
Same
as
#20.
Same
as
#20.
Same
as
#20.
#26
Needle
(upper),
thread
trimmer
and
thread
wiper
will
not
stop
after
end
back
-
tacking.
Malfunction
of
the
control
printed
-circuit
board.
Replace
the
operation
box.
#27
Will
not
perform
fixed
-stitching
at
low
speed.
•
Is
it
possible
when
the
fixed
-stitch
count
is
changed
and
you
try
again?
(YES)
(NO)
Malfunction
of
the
operation
box.
Malfunction
of
the
control
printed
-circuit
board.
Replace
the
operation
box.
Replace
the
control
printed
-
circuit
board.
#28
Will
not
trim
thread
after
fixed
-stitch
sewing.
Malfunction
of
the
operation
box.
Replace
the
operation
box.
Replace
the
control
printed
-
circuit
board.
#29
Will
not
perform
continuous
back-
tacking.
Malfunction
of
the
control
printed
-circuit
board.
Replace
the
control
box.
#30
Will
not
trim
thread
after
continuous
backtacking.
Malfunction
of
the
control
printed
-circuit
board.
Replace
the
control
box.
#31
Will
not
perform
one
-stitch
correc-
tion.
Malfunction
of
the
control
printed
-circuit
board.
Replace
the
control
box.
#32
Will
not
start
slowly.
Malfunction
of
the
control
printed
-circuit
board.
Replace
the
control
box.
-
48
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