Brother International MD-817 Service Manual - Page 45

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C DC MOTOR TROUBLESHOOTING GUIDE Start Press the treadle slightly forward. Set the control box switches: • Needle position-needle (low- er) • Correction-none • Slow start-none • Set the maximum speed VA fully counterclockwise. Does the machine operate at low speed? Yes Return the treadle to neutral. Set all switches in the operation box to OFF. Set the machine's thread wiper swtich to OFF. Set the treadle to neutral. Set the power switch to ON. Can a clear brake sound ("click") be heard? Yes Does the machine stop? Yes Set the speed adjustment control fully clockwise (maximum speed). Gradually depress the treadle forward until it's completely depressed. Does the machine speed increase in accordance with the amount the treadle # 1 is depressed? Yes Return the treadle to neutral. Is the control box lamp illuminated? Yes Is the operation box lamp illuminated? Yes Has the machine stopped? Yes Does the brake # 2 function during deceleration? Does the needle (lower) stop? Yes Repeat the treadle forward depression and return to neutral steps. # 3 Is there any variance in the Yes needle (lower) stopping position? No # 4 Is the needle (lower) stopping position No suitable? Yes - 41 - # 5 # 6 # 7 # 8 # 9 # 10

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C
DC
MOTOR
TROUBLESHOOTING
GUIDE
Start
Press
the
treadle
slightly
forward.
Set
the
control
box
switches:
•
Needle
position
—needle
(low-
er)
•
Correction
—none
•
Slow
start
-none
•
Set
the
maximum
speed
VA
fully
counterclockwise.
Set
all switches
in
the
operation
box
to
OFF.
Set
the
machine's
thread
wiper
swtich
to
OFF.
Set
the
treadle
to
neutral.
Set
the
power
switch
to
ON.
Can
a
clear
brake
sound
("click")
be
heard?
Yes
Is
the
control
box
lamp
illuminated?
Yes
Is
the
operation
box
lamp
illuminated?
Yes
Has
the
machine
stopped?
Yes
#
1
#
2
#
3
#
4
Does
the
machine
operate
at
low
speed?
Yes
Return
the
treadle
to
neutral.
Does
the
machine
stop?
Yes
#
5
Set
the
speed
adjustment
con-
trol
fully
clockwise
(maximum
speed).
Gradually
depress
the
treadle
forward
until
it's
completely
de-
pressed.
Does
the
machine
speed
increase
in
accordance
with
the
amount
the
treadle
is
depressed?
Yes
#
6
Return
the
treadle
to
neutral.
Does
the
brake
function
during
deceleration?
Does
the
needle
(lower)
stop?
Yes
#
7
Repeat
the
treadle
forward
depress-
ion
and
return
to
neutral
steps.
Is
there
any
variance
in
the
needle
(lower)
stopping
position?
No
Is
the
needle
(lower)
stopping
position
suitable?
Yes
#
8
No
#
9
#
10
-
41
-
Yes