Brother International MD-817 Service Manual - Page 56

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LI Main flow-chart START I Blown fuse A Motor starts when power switch turns ON. Disconnect (from among the external connectors) the power-supply, motor, brake, presser foot, thread trimmer and three stand-operation connectors. From among the internal connectors, disconnect CN5 from the D printedcircuit board. Related Connectors (p.55) Machine doesn't operj ate. PTR, D: OK? NO #1 (p.55) Printed-circuit board/removal YES Blown fuse #2 (p.55) N YES Fuse replacement Related (resetting of overvoltage Connectors relay) (p.55) 1. Connect only the power-supply connector (which is one of the external connectors). 2. Among the internal connectors, disconnect CN5 from the D printedcircuit board and CN8 from the transformer. Note: All other internal connectors must be connected. 3. Turn the VR for high speed fully clockwise. (Note) Related Connectors (p.55) Power ON LED 1 illumination NO #3 (p.55) #3-1 (p.56) YES CN8 voltage: OK? NO #4 (p.58) YES Switch OFF the power, connect CN8, and then return the power switch to ON. Connector related (p.55) Transformer replacement Refer to the section concerning disconnection and removal of printed-circuit boards; then disconnect and remove the printed-circuit boards and replace the transformer. Set the treadle lever for forward depression. LED1 flashing. YES #5 (p.55) NO Set the treadle to neutral position. Note: Be absolutely sure to disconnect CN5. If disconnection is forgotten, the printed-circuit board will be damaged. CP5: OK? NO #6 (p.61) YES O107 „K" or CN5 pin 2: OK NO #7 (p.60) YES Power OFF (P53) - 52 - #5-1 (p.59) Treadle unit (p.67) #7-1 (p.60)

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LI
Main
flow
-chart
START
I
Blown
fuse
Motor
starts
when
power
switch
turns
ON.
Machine
doesn't
operj
ate.
A
Disconnect
(from
among
the
external
connectors)
the
power
-supply,
motor,
brake,
presser
foot,
thread
trimmer
and
three
stand
-operation
connectors.
From
among
the
internal
connectors,
disconnect
CN5
from
the
D
printed
-
circuit
board.
Related
Connectors
(p.55)
PTR,
D:
OK?
#1
(p.55)
YES
Blown
fuse
#2
(p.55)
N
NO
YES
Printed
-circuit
board/removal
Fuse
replacement
(resetting
of
overvoltage
relay)
Related
Connectors
(p.55)
1.
Connect
only
the
power
-supply
connector
(which
is
one
of
the
external
connectors).
2.
Among
the
internal
connectors,
disconnect
CN5
from
the
D
printed
-
circuit
board
and
CN8
from
the
transformer.
Note:
All
other
internal
connectors
must
be
connected.
3.
Turn
the
VR
for
high
speed
fully
clockwise.
(Note)
Related
Connectors
(p.55)
Power
ON
LED
1
illumination
#3
(p.55)
YES
CN8
voltage:
OK?
#4
(p.58)
YES
NO
NO
#3-1
(p.56)
Transformer
replacement
Refer
to
the
section
concerning
disconnection
and
removal
of
printed
-circuit
boards;
then
dis-
connect
and
remove
the
printed
-circuit
boards
and
replace
the
transformer.
Switch
OFF
the
power,
connect
CN8,
and
then
return
the
power
switch
to
ON.
Connector
related
(p.55)
Set
the
treadle
lever
for
forward
depression.
LED1
flashing.
#5
(p.55)
NO
YES
Set
the
treadle
to
neutral
position.
Note:
Be
absolutely
sure
to
disconnect
CN5.
If
disconnection
is
forgotten,
the
printed
-circuit
board
will
be
damaged.
CP5:
OK?
#6
(p.61)
YES
O107
„K"
or
CN5
pin
2:
OK
#7
(p.60)
YES
Power
OFF
(P53)
NO
#5-1
(p.59)
NO
Treadle
unit
(p.67)
#7-1
(p.60)
-
52
-