8. ELECTRICAL MECHANISM
136
BAS-311G, BAS-326G
Problem #22 Thread wiper does not operate.
Cause
Inspection/Remedy/Adjustment
Replacement if a malfunction
1. Incorrect mechanism adjustment
Adjust the thread wiper while referring to “7-11.
Adjusting the thread wiper”.
(If it is clear that the thread wiper mechanism is
not operating, carry out inspections 2. and 3.
below.)
2. Poor connector contact
Check that connector P1 (MAIN) is inserted into
the PMD P.C. board.
3. Malfunction of thread wiper
solenoid
Disconnect connector P6 (SOL1) from the PMD
P.C. board, and measure the resistance between
pins 2-5 of the cord-side connector.
OK if approximately 4
Ω
Thread wiper solenoid
4. Malfunction of PMD P.C. board
With connector P6 (SOL1) connected to the
PMD P.C. board, turn on the power and carry out
sewing, and measure the voltage between pins
2-5 of connector P6 (SOL1).
OK if voltage is output momentarily at the sewing
end.
PMD P.C. board
Problem #23 Needle does not stop in the up position ([E110] is displayed.)
Cause
Inspection/Remedy/Adjustment
Replacement if a malfunction
1. Incorrect adjustment
Adjust while referring to “7-21. Adjusting the
needle up stop home position” and “7-22.
Adjusting the needle up stop position”.
2. Malfunction of synchronizer
Refer to inspection #19.
3. Malfunction of cord
Refer to inspection #18.
4. Malfunction of power supply
motor P.C. board
With connector P2 (POWER2) connected to the
PMD P.C. board, measure the voltage at the cord.
OK if approximately 30 V DC between pins 3-4
Power supply motor P.C.
board
5. Malfunction of main P.C. board
Main P.C. board
6. Malfunction of motor
Motor
4892Q
5088Q
5089Q
