Brother Industries SUPER ACE+e, Service Manual

Page: 53 / 56

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15.The LCD light
does not light.
1) Is the voltage between pins 4-5 20 to 30 VDC when
the connector (CN6) which is output from the power
board is disconnected?
2) Is fuse blown?
3) Is the voltage between pins 9-10 of the LCD module
connector (CN9) approx. 9 VDC?
4) Others
1) Replace the power board
assembly.
2) Replace fuse after correctly
defect that caused fuse to
blow.
3) Replace main PC board
assembly.
4) Replace LCD module
assembly.
16.Thread cannot
be wound
around bobbin.
1) Is resistance between both ends of connector CN5
(for bobbin winder switch) under 1
Ω
when thread is
wound, or infinity in other cases?
2) Is bobbin winder attached correctly?
3) Others
1) Replace bobbin winder switch
assembly.
2) Adjust bobbin winder position.
3) Replace main PC board.
17.Needle thread
breakage
detector does
not operate
correctly.
1) When passing thread through thread route and
setting thread condition as follows, is voltage
between pins 2-1 of connector CN10 (for needle
thread breakage detector) correct?
When thread is tensioned..... 0 VDC
When thread is loose............ 5 VDC
2) Others
1) If condition does not change
after adjusting thread take-up
spring, replace needle thread
breakage detecting PC board.
2) Replace main PC board.
18.Bobbin thread
detector does
not operate
correctly.
1) Are both ends of bobbin thread detector correctly
positioned?
2) Is voltage between pins 1-2 of connector CN18(for
bobbin thread detecting LED) approx. 1 VDC?
3) After inserting the bobbin as follows, is voltage
between pins 2-1 of connector CN17(for bobbin
thread detecting photo-transistor)correct?
Bobbin without thread..... 0.1 to 0.2 VDC
Bobbin with thread............. 2 to 5 VDC
4) Others
1) Correct directions of bobbin
thread detector ends.
2) Replace photo-diode
assembly.
3) Replace photo transistor
assembly.
4) Replace main PC board.
19.Embroidery unit
does not work
correctly.
(OPTION)
1) Is your card a embroidery card? Is embroidery unit
connected to sewing machine correctly?
2) Is embroidery unit installed in sewing machine
correctly? Are timing belt tension, gear meshing, and
wiring correct?
3) Are resistances between pins 1-3 and 2-4 of
connectors on X and Y pulse motors (where
embroidery unit is installed) 8-10
Ω
?
4) When embroidery unit is installed, are resistances
between pins 1-3 and 2-4 of connectors CN19 and
CN20 on X and Y pulse motors 8-10
Ω
?.
5) Are resistances between pins 5-6 of connector CN19
on the X pulse motor correct in the following states?
When embroidery unit is installed.....1
Ω
or less
When embroidery unit is removed.....infinite
6) Does a malfunction occur in the initial positioning of
carriage when the power is turned on?
7) Others
1) Check your card and
connection between
embroidery unit and sewing
machine.
2) Adjust position of embroidery
unit. (Torque of embroidery
frame is important.)
3) Replace X or Y pulse motor
or lead wire assembly.
4) Replace lead wire assembly
or connector 176496.
5) After confirming the
installation of X pulse motor
lead wire assembly, replace X
pulse motor lead wire
assembly, connector 176496,
lead wire assembly or X
sensor PC board assembly.
6) Replace X or Y sensor PC
board assembly.
7) Replace main PC board
assembly.
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