18
TO ENTER SELF-DIAGNOSTIC MODE:
Preparation:
1. Turn the power switch off.
2. Move the bobbin winder spindle to the left.
3. Raise the feed dog.
4. Set the speed control lever to the left.
5. Remove the presser foot and raise the presser foot lifter.
6. Turn the hand wheel toward you to raise the needle to its highest position.
NOTE:
• Be careful: the sewing machine may start running in its own while in test mode.
• Turn off the power switch before replacing any parts.
• Repeat the diagnostic test until the problem has been resolved.
To begin:
Turn on the switch. If any of the following problems occur, take the recommended actions in the order they
are shown.
1. The machine does not respond when the power switch is turned on:
• Check each connector connection.
• Replace the switching regulator (with the machine socket).
• Replace the printed circuit board A.
2. The sewing machine lamp does not light up:
• Be sure all connectors are connected to the circuit board L and A properly (Refer to page 23).
• Replace the printed circuit board L.
• Replace the printed circuit board A.
SELF-DIAGNOSTIC TEST
1. Turn the power switch on while
simultaneously pressing auto-lock
button and needle up/down button.
2. The LED display
will indicate “
1”.
3. Press the MODE key
to
enter the
self-diagnostic mode.