Foot Controller Does Not Operate Normally When Depressed; Lcd Does Not Light Up Properly; Bobbin Winder Doesn't Work; Needle Thread Breakage Detector Doesn't Work Correctly - Brother PE-300S Service Manual

PROBLEM
10. Foot controller 1. Is resistance between pins 2-3 of foot controller
does not operate
normally when
depressed.
2. When there is a pin jack and the foot controller is
3. Others
11. LCD does not 1. Have you tried adjusting the contrast of the
light up properly.
2. Is the voltage between pins 1-4 of power source
3. Others
12. Bobbin winder 1. Are both ends of BW switch connector (CN3)
doesn't work.
2. Has the bobbin winder been assembled
3. Others
13. Needle thread 1. When threaded along thread paths and thread
breakage detector
doesn't work
correctly.
2. When threaded along thread paths and thread
3. Others
14. Embroidery 1. Is the card inserted a proper embroidery card? Is
attachment
doesn't work well.
2. Is the embroidery attachment correctly assembled?
3. Is resistance between pins 1-2 and 3-4 of the X
4. With the embroidery unit attached to the sewing
5. Is the voltage between pins 6-2 of the
6. Is initial movement correct when power is turned
7. Others
CHECK
connector (CN1 of NP board) 1 Ω or less when
there is no pin jack and ∞ with a pin jack?
depressed, does the resistance between pins 1-3
of the foot controller connector (CN1 of the NP
board) fluctuate between several Ω -10k Ω ?
LCD?
2
connector (CN13) between DC -18-35V?
1 Ω or less during bobbin winding, and ∞ at
other times?
correctly?
conditions are set as follows, is voltage between
pins 2-3 of needle thread breakage detector
connector (SSVR board connector) as follows?
When thread tension is tightened ...DC
When thread tension is loosened ...DC
conditions are set as follows, is voltage between
pins 1-7 of SSVR board connector (CN4) as
follows?
When thread tension is tightened ...DC
When thread tension is
loosened.........................................DC
the embroidery attachment connected to the
sewing machine correctly?
In particular, is the timing belt tension, gear settings, and
code processing correct?
and Y pulse motor connectors (where the
embroidery unit attaches to the sewing machine)
between 9-11 Ω?
machine, is resistance between pins
1-3, 5-7, 9-11 and 13-14 of the embroidery
attachment connector (CN12) between 9-11 Ω?
embroidery attachment connector (CN12) as
listed below?
With embroidery unit
attached to machine ........ DC
When unit is not
attached to machine ........ DC
on?
1. Replace pin jack assembly
2. Replace foot controller.
3. Change main PC board assembly or NP
(needle position) board assembly.
1. Adjust contrast.
2. Replace main PC board assembly.
3. Replace main PC board assembly.
1. Change bobbin winder switch assembly.
2. Adjust.
3. Replace main PC board assembly.
1. If condition does not change after adjusting
thread take-up spring, replace needle thread
breakage detecting PC board.
0V
5V
2. Exchange SS (VR) PC board assembly.
0V
5V
3. Replace main PC board assembly.
1. Check.
2. Adjust (torque of embroidery hoop is
important).
3. Replace X or Y pulse motor, or X or Y initial
sensor assembly.
4. Replace XYPM lead wire assembly or
connector 176496.
5. Replace connector 176496, XYPM lead wire
assembly, or X initial sensor assembly.
approx. 2V
approx. 5V
6. Replace X or Y initial sensor assembly.
7. Change main PC board assembly.
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REMEDY