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Before replacing the printed circuit board A, copy the data in the board to a USB flash drive.
* Check the clear set mode (refer to page 45).
(1)
(2) (3)
(29)
(28)
(27)
(26)
(25)
(24)
(23)
(21)
(22)
Replacing Electronic Components
Setscrew
Setscrew
Printed circuit board A connection
(4) (5)
(19)
(17)
(20)
(18)
Printed circuit board A
NOTE:
Do not disconnect the connectors by pulling on cord.
To disconnect the connectors, grasp the connector, not
the cord.
To remove:
1. Remove the front cover (refer to pages 6 and 7).
2. Remove the setscrews (4 pcs.) and disconnect all the
connectors from the printed circuit board A.
Remove the printed circuit board A.
To attach:
3. Follow the above procedure in reverse.
Be sure that the connector post on the printed circuit
board to which it is connected.
Position the connector correctly, then push it straight
down until it locks in place.
(1)
Bobbin winder switch
(2)
LCD (Flexible)
(3)
Touch panel (Flexible)
(6)
(4)
Printed circuit board L1 (black)
(5)
Printed circuit board L2 (white)
(7)
(6)
Printed circuit board L3 (red)
(7)
Slide volume
(8)
(8)
Printed circuit board F
(9)
Presser foot lifter switch
(9)
(10)
ErP switch (Auto-off timer switch)
(11)
BH sensor
(10)
(12)
Upper thread sensor
(11)
(13)
Knee lifter sensor
(12)
(14)
Power switch
(13)
(15)
Rotary encoder
(16)
Stitch regulator
(14)
(17)
Thread cutter motor
(18)
Remaining bobbin thread detecting sensor
(19)
Feed motor
(15)
(20)
Remaining bobbin thread detecting motor
(16)
(21)
Needle plate sensor
(22)
Drop feed detecting sensor (brown)
(23)
DC motor
(24)
Presser foot lifter motor
(25)
Thread tension motor
(26)
Zigzag motor
(27)
USB
(28)
Foot control & Thread cutter switch jack
(29)
Phase sensor
11
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