Brother International MD-817 Service Manual - Page 49

Brother International MD-817 Manual

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ITEM PROBLEM #1 No "click" sound and from brake when #2 power is switched ON. Control box lamp doesn't illuminate. CHECK • Is the connection of the 4-pin or 3-pin power plug correct? • The fuse has blown. (For 3-phase, fuse on the outside of control box has failed. For single-phase, 15A fuse on the power board has failed.) * Fuse fails again after replacement. • The fuse (8A fuse inside the control box) has blown. • Other than that above. PROBABLE CAUSE Power plug is incorrectly connected. Fuse has blown. Malfunction of 8A fuse, the control printed-circuit board. Malfunction of the control printed-circuit board. REMEDY Connect the power plug correctly. Replace the fuse. Replace the motor and control box. Replace the fuse and control box. Replace the control box. #3 No operation box • Does the operation box lamp is illuminated. function correctly? (YES) Bulb failure-no functional problem. (NO) Malfunction of the operation Replace the operation box. box. • Other than that above. Malfunction of the control Replace the control box. printed-circuit board. #4 Machine starts when power is switched ON. Malfunction of the control printed-circuit board. Malfunction of the D printedcircuit board. (single phase 110V or higher) Replace the control box. Replace the control box motor. #5 Machine operate. doesn't • Does the control box lamp flash? (YES) Large torque (head). Reduce the torque. Malfunction of control Replace the control box. printed-circuit board Malfunction of treadle unit. Replace the control box. • Is there a motor noise? (YES) Large torque (head). Reduce the torque. Malfunction of treadle unit. Replace the control box. • Other than the above. Malfunction of treadle unit. Replace the control box. Malfunction of treadle unit. Replace the control box. Adjust VR TRIM (LOW). Machine operates in reverse. Unsuitable low- speed operation. Machine operates at Malfunction of treadle unit. Replace the control box. high speed. #6 Machine doesn't stop when treadle is set at neutral. Synchronizer installation position is not suitable. Synchronizer malfunction. Control printed-circuit board malfunction. Position adjustment: 0.5mm Replace the synchronizer. Replace the control box. #7 Operation speed • Uneven operation at Malfunction of treadle unit. doesn't correspond treadle maximum. Malfunction of control box. to amount of treadle • Initial operation speed is Malfunction of treadle unit. depression. fast (no low-speed range). Replace the control box. Replace the control box. Replace the control box. - 45 -

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ITEM
PROBLEM
CHECK
PROBABLE
CAUSE
REMEDY
#1
and
#2
No
"click"
sound
from
brake
when
power
is
switched
ON.
Control
box
lamp
doesn't
illuminate.
•
Is
the
connection
of
the
4
-pin
or
3
-pin
power
plug
correct?
•
The
fuse
has
blown.
(For
3
-phase,
fuse
on
the
out
-
side
of
control
box
has
failed.
For
single-phase,
15A
fuse
on
the
power
board
has
failed.)
*
Fuse
fails
again
after
re-
placement.
•
The
fuse
(8A
fuse
inside
the
control
box)
has
blown.
•
Other
than
that
above.
Power
plug
is
incorrectly
connected.
Fuse
has
blown.
Malfunction
of
8A
fuse,
the
control
printed
-circuit
board.
Malfunction
of
the
control
printed
-circuit
board.
Connect
the
power
plug
cor-
rectly.
Replace
the
fuse.
Replace
the
motor
and
con
-
trol
box.
Replace
the
fuse
and
control
box.
Replace
the
control
box.
#3
No
operation
box
lamp
is
illuminated.
•
Does
the
operation
box
function
correctly?
(YES)
(NO)
•
Other
than
that
above.
Bulb
failure
-no
functional
problem.
Malfunction
of
the
operation
box.
Malfunction
of
the
control
printed
-circuit
board.
Replace
the
operation
box.
Replace
the
control
box.
#4
Machine
starts
when
power
is
switched
ON.
Malfunction
of
the
control
printed
-circuit
board.
Malfunction
of
the
D
printed-
circuit
board.
(single
phase
110V
or
higher)
Replace
the
control
box.
Replace
the
control
box
motor.
#5
Machine
doesn't
operate.
Machine
operates
in
reverse.
Unsuitable
low
-
speed
operation.
Machine
operates
at
high
speed.
•
Does
the
control
box
lamp
flash?
(YES)
•
Is
there
a
motor
noise?
(YES)
•
Other
than
the
above.
Large
torque
(head).
Malfunction
of
control
printed
-circuit
board
Malfunction
of
treadle
unit.
Large
torque
(head).
Malfunction
of
treadle
unit.
Malfunction
of
treadle
unit.
Malfunction
of
treadle
unit.
Malfunction
of
treadle
unit.
Reduce
the
torque.
Replace
the
control
box.
Replace
the
control
box.
Reduce
the
torque.
Replace
the
control
box.
Replace
the
control
box.
Replace
the
control
box.
Adjust
VR
TRIM
(LOW).
Replace
the
control
box.
#6
Machine
doesn't
stop
when
treadle
is
set
at
neutral.
Synchronizer
installation
po-
sition
is
not
suitable.
Synchronizer
malfunction.
Control
printed
-circuit
board
malfunction.
Position
adjustment:
0.5mm
Replace
the
synchronizer.
Replace
the
control
box.
#7
Operation
speed
doesn't
correspond
to
amount
of
treadle
depression.
•
Uneven
operation
at
treadle
maximum.
•
Initial
operation
speed
is
fast
(no
low
-speed
range).
Malfunction
of
treadle
unit.
Malfunction
of
control
box.
Malfunction
of
treadle
unit.
Replace
the
control
box.
Replace
the
control
box.
Replace
the
control
box.
-
45
-