Filter
Top Products
8. ELECTRICAL MECHANISM
132
BAS-311G, BAS-326G
Problem #17 Intermittent presser foot does not drop during sewing.
Cause Inspection/Remedy/Adjustment Replacement if a malfunction
2. If the presser foot does not
operate and [E300] is displayed,
there is a malfunction of the
PMD P.C. board or of the power
supply motor P.C. board.
1) Disconnect connector P9 (POWER1) from
the PMD P.C. board and measure the
resistance between pins 1-2 at connector P9.
OK if ∞ Ω; if 0 Ω, there is a malfunction of
the PMD P.C. board.
2) Measure the resistance between the fuse F2
terminal that is close to P6 (MAIN) and pin 2
of connector P7 (PMD) on the power supply
motor P.C. board. (D10 check)
OK if ∞ Ω
3) Disconnect connector P9 (POWER1) from
the PMD P.C. board, and then measure the
voltage between pins 1-2 of the cord-side
connector.
OK if approx. +100 V
After measuring, turn off the power, wait 5
minutes or more and then insert P9.
4) Disconnect connector P2 (POWER2) from
the PMD P.C. board, and then measure the
voltage between pins 1-2 of the cord-side
connector.
OK if approx. +16 V
After measuring, turn off the power, wait 5
minutes or more and then insert P2.
5) Check that connector P1 (MAIN) is inserted
into the PMD P.C. board.
PMD P.C. board, or power
supply motor P.C. board
3. If the presser foot moves slightly
and then [E300] is displayed,
there is a malfunction of the
encoder.
1) Check that connector P5 (P-ENC) is inserted
into the main P.C. board.
2) Check the encoder input while referring to
“2-8. Input checking method”.
Pulse motor P assembly
4. If the presser foot operates and
[E300] is displayed, there is a
malfunction of the work clamp
home position sensor.
1) Check that connector P8 (SENSOR1) is
inserted into the main P.C. board.
2) Check the work clamp home position sensor
input while referring to “2-8. Input checking
method”.
3) If a metallic object is brought close to the
work clamp home position sensor and the
LED inside the sensor does not illuminate,
there is a malfunction of the sensor.
4) If it illuminates, the home position dog is
incorrectly adjusted.
Switch to home position adjustment mode,
and adjust the position of the home position
dog. Refer to “7-20. Adjusting the home
position”.
Work clamp home position
sensor
4884Q