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8. ELECTRICAL MECHANISM
133
BAS-311G, BAS-326G
Problem #17 Intermittent presser foot does not drop during sewing.
Cause Inspection/Remedy/Adjustment Replacement if a malfunction
5. If the presser foot does not
move and [E300] is displayed,
there is a malfunction of the
pulse motor or cord.
1) Disconnect connector P3 (PPM) from the
PMD P.C. board, and measure the resistance
between pins 1-2 and 3-4 at the cord-side
connector.
OK if 2-3 Ω
After measuring, insert P3.
2) If 1) is OK, there is a malfunction of the PMD
P.C. board.
Pulse motor P assembly
PMD P.C. board
Problem # 18 Sewing machine does not operate during sewing and [E120] is displayed.
Cause Inspection/Remedy/Adjustment Replacement if a malfunction
1. Malfunction of sewing machine
motor cord
Check connector P4 (UVW) of the power supply
motor P.C. board and the sewing machine motor
connector.
Motor cable
2. If the fuse (F1) on the power
supply motor P.C. board is
blown, there is a malfunction of
the main P.C. board.
1) If the fuse (F1) is blown, check the resistance
values between all pins of the connector P4
(UVW) and the pins of the fuse (∞ Ω) and
replace the fuse.
2) If the fuse blows again, replace the power
supply motor P.C. board.
Power supply motor P.C.
board
3. Sewing machine motor overheats
and the thermostat inside the
motor operates when the sewing
machine is operated at short
cycle.
1) Turn off the power and let the sewing
machine stand for 30 minutes.
2) Turn the power back on; OK if operation is
normal.
Avoid repeated sewing of sewing data that is
less than 15 stitches.
Motor cable
4888Q