Brother International MD-817 Service Manual - Page 57

Brother International MD-817 Manual

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Caution (p.63) 1. Connect all connectors except the operation box. 2. Three printed-circuit board switches: needle position switch: lower; correction switch: OFF; slow-start switch: OFF. 3. Turn the high-speed VR fully counterclockwise. Related Connectors (p.55) Wiper operation with power ON. Thread trimmer operation with power ON. Reverser operation with power ON. Brake ON with power ON. Motor roars or hums dur- I vi.. ing forward backtack. LED blinking during forward backtack. I Abnormal high speed while depressed forward. Pedal one-stitch sewing difficult. Sometimes not thread trimming. Deviation of needle (low- V er) and needle (upper) stopping. High speed OK, but no low speed. Pedal low-speed range is limited. Power ON. Motor starts. NO Wiper operates. #100 NO YES YES Return to "START" (p.52) #100-1 (p.64) Thread trimmer operates. #101 NO Reverse operates. #102 NO YES YES #101-1 (p.64) #102-1 (p.65) Brake sound NO #103 YES #103-1 (p.65) Machine pulley is light. NO #103 YES Treadle lever depressed forward. LED 1 blinks? NO Operation at high speed. #104 NO YES YES Operation at low speed. YES NO Have #3-#7 adjustments been made? Low-speed torque: OK NO YES #106 (p.66) YES Turn high-speed VR fully clockwise. .7 (P54) - 53 - Return to "START" (p.52) #104-1 (p.66) Return to "START" (p.52) NO D printed-circuit board check (p.58) #106-1 (p.66)

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Caution
(p.63)
Wiper
operation
with
power
ON.
1.
Connect
all
connectors
except
the
operation
box.
2.
Three
printed
-circuit
board
switches:
needle
position
switch:
lower;
correction
switch:
OFF;
slow
-start
switch:
OFF.
3.
Turn
the
high-speed
VR
fully
counterclockwise.
Related
Connectors
(p.55)
Thread
trimmer
opera-
tion
with
power
ON.
Power
ON.
Motor
starts.
Reverser
operation
with
power
ON.
Brake
ON
with
power
ON.
I
Motor
roars
or
hums
dur-
vi..
ing
forward
backtack.
LED
blinking
during
for-
ward
backtack.
I
Abnormal
high
speed
while
depressed
for-
ward.
Pedal
one
-stitch
sewing
difficult.
NO
Wiper
operates.
#100
NO
Thread
trimmer
operates.
#101
NO
Reverse
operates.
#102
NO
Brake
sound
#103
YES
Machine
pulley
is
light.
#103
YES
YES
YES
Return
to
"START"
(p.52)
YES
#100-1
(p.64)
YES
#101-1
(p.64)
NO
#102-1
(p.65)
NO
Treadle
lever
depressed
forward.
LED
1
blinks?
Sometimes
not
thread
trimming.
NO
Operation
at
high
speed.
#104
Deviation
of
needle
(low-
er)
and
needle
(upper)
stopping.
V
NO
Operation
at
low
speed.
High
speed
OK,
but
no
low
speed.
YES
Low
-speed
torque:
OK
#106
(p.66)
Pedal
low
-speed
range
is
limited.
YES
YES
#103-1
(p.65)
YES
Return
to
"START"
(p.52)
NO
Have
#3—#7
adjustments
been
made?
NO
YES
NO
#104-1
(p.66)
Return
to
"START"
(p.52)
Turn
high-speed
VR
fully
clockwise.
D
printed
-circuit
board
check
(p.58)
#106-1
(p.66)
.7
(P54)
—
53
—