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Trouble Cause (1) Cause (2) Checking order and adjusting procedure Page
From the previous page
9. Error No. 9
Safety switch error
1. When the sewing machine head
is tilted, error is displayed.
2. When the sewing machine head
is not tilted, error is displayed.
4. Short-circuit of wiring
5. Failure with MAIN circuit board
6. Fuse has blown out.
1. Starting switch is pressed.
1. Installing position of safetu switch
is wrong.
2. Connection is defective or cable
is defective.
3. Safety switch is defective.
There is a case of short-circuit of wiring of stepping motor when fuse
has blown out. Check continuity between earth and connector pins of
the respective stepping motors. When fuse F5 has blown out, there is
a case of short-circuit of wiring of thread tension solenoid, presser
liting solenoid, or cloth cutting knife solenoid. Check continuity between
earth and connector pins of the respective solenoids. In case of short-
circuit of wiring, there is a case where the transistor on MAIN circuit
board has already broken. When there is no spare fuse, replace the
fuse after removing the cause with special care.
Check according to the aforementioned items. When fuse has not blown
out, replace MAIN circuit board.
Check according to the aforementioned items and replace fuse F5
(10AT) after removing the cause.
Do not press the starting switch when the sewing machine head is
tilted.
Check assembling of the safety switch.
Check the connection of CN23 and CN72.
Check ON/OFF with input check 3 of the test mode.
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