Brother PE-180D Service Manual page 38

CONDITION
3. Pattern 1) Is the start/stop switch stuck?
selection is not
possible.
2) Other
4. Main motor 1) Does the hand wheel turn easily?
does not
operate.
2) Is the main motor assembly connector
3) Is the resistance between the terminals of
4) Is the start/stop switch normal?
5) Is the presser foot lever down? Is the
6) Other
5. Main motor 1) When the hand wheel is rotated slowly in
operates
unevenly.
2) Other
PROBLEM SYMPTOMS
(power supply unit connector CN1)
correctly connected?
the main motor assembly normal?
For 120 V models ................ 120 to 180 Ω
For 230 V models ................ 400 to 800 Ω
Resistance between both switch sides:
When switch is pressed .... less than 1 Ω
When switch is released ........ ∞ (infinite)
presser switch normal?
Resistance between both sides of CN8
Presser foot is up .............. less than 1 Ω
Presser foot is down............... ∞ (infinite)
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?
1) Correct, or replace the SS PC board
assembly.
2) Replace the LCD module assembly.
1) Correct installation so hand wheel turns
easily.
2) Confirm connection.
3) Replace the main motor assembly.
4) Replace the SS PC board assembly.
5) Confirm the presser switch installation; if
the problem remains, replace the
presser switch.
6) Replace the main PC board assembly or
the power supply unit assembly.
1) Replace the NP PC board assembly.
2) Replace the main PC board assembly.
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COUNTERMEASURES