Brother PE-180D Service Manual page 39

CONDITION
6. Embroidery 1) Is the rotary shutter correctly positioned?
frame operation
2) Is the resistance between the following
is not normal.
3) When the hand wheel is rotated slowly in
4) Other
7. LCD does not 1) Is the voltage between 8-7 in the LCD
operate
normally.
2) Other
8. LCD backlight 1) Disconnect the output connector (CN1)
does not work.
2) Is the voltage between 9-10 of the LCD
3) Other
9. Bobbin winding 1) Is the resistance between both sides of
is not possible.
2) Is the installation correct?
3) Other
10.Needle thread 1) Is the voltage between 2-3 to the needle
detection does
not operate
normally.
2) Other
PROBLEM SYMPTOMS
pulse motor connector pins normal?
X (CN16).. Between 1-2, 3-4 → Approx. 3 Ω
Y (CN17).. Between 1-2, 3-4 → Approx. 4 Ω
reverse, does the voltage between 2-5, 3-
5 and 4-5 in the NP PC board assembly
connector (CN10) fluctuate between 0 to
5 V DC?
module connector (CN5) -5 to -10 V DC?
from the power supply PC board; is the
voltage between 3-4 normal?
Between 3-4 .......................13 to 18 V DC
module connector (CN5) 9V DC?
the bobbin winder switch connector (CN4)
less than 1 Ω during bobbin winding and
∞ (infinite) at all other times?
thread breakage sensor connector (CN9)
normal when the thread is tensioned and
released with the needle thread correctly
threaded in the thread path?
When thread is tensioned ............... 0 V Ω
When thread is released ................. 5 V Ω
1) Adjust (see page 16.)
2) Replace the defective pulse motor.
3) Replace the NP PC board assembly.
4) Replace the main PC board assembly.
1) Replace the main PC board assembly.
2) Replace the LCD module assembly or
the main PC board assembly.
1) Replace the power supply unit assembly.
2) Replace the main PC board assembly.
3) Replace the LCD module assembly.
1) Replace the bobbin winder switch
assembly.
2) Adjust (see page 21).
3) Replace the main PC board assembly.
1) Adjust the thread take-up spring; if the
problem remains, replace the thread
breakage sensor PC board assembly
(see p.20).
2) Replace the main PC board assembly.
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COUNTERMEASURES