54
104 73 15-26
Speed adjustment no operation
Check if the connector from the speed adjustment is properly connected to the LCD board CN2.
Replace the Speed slide resistor.
Replace the LCD board.
No operation of the Zig-zag step motor
Check - using Service program
1. Go to the service program of the machine.
2. In Menu 1 test the No 1~3.
3. Check if the connectors N5 and N9 are properly connected to the main board.
If the problem still remains.
Replace the ZigZag Photo sensor board .
Replace the ZigZag step motor.
Replace the main board.
No operation of feed stepper motor
Check - using Service program
1. Go to the service program of the machine.
2. In Menu 1 test the No 4~6.
3. Check if the connectors N6 and N11 are properly connected to the main board. If the problem still remains:
Replace the feed photo-sensor board.
Replace the feed stepping motor.
Replace the main board.
The bobbin winder spindle is in ”off” position,
Check - using Service program
1. Go to the service program of the machine.
2. In Menu 2 choose the No 4 Bobbin sensor.
3. Check if the connector N14 is properly connected to the main board.
Check if the bobbin winder spindle and microswitch are making proper contact.
Adjustment :
Loosen the two screws that holds the microswitch in place, reposition the micro-switch until it is positioned in
such a way that the bobbin spindle is pressing fully against the switch, tighten the two screws.
If the problem still remains:
Replace the bobbin winder micro-switch.
Replace the main board.
No operation of BH
Check - using Service program
1. Go to the service program of the machine.
2. In Menu 2 choose the No 4 Button hole sensor switch.
3. Check if the connector N18 is properly connected to the main board.
4. Check if the indentation on the top of the BH arm is positioned in the center of photosensor switch.
Adjustment :
See adjustment : Button hole sensor position.
If the problem still remains.
Replace the sensor board.
Replace the main board.
Fault fi nding Ambition 1.0 - 1.5