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5
DIAGNOSIS CHART
A Operation 1
Be cautious of sudden running of the machine when turning on the power switch.
If nothing is happened on the machine when the power switch is turned on, turn off the power switch and
check the following points:
Step 1: Make sure that all of the connectors are connected properly.
Disconnect the power supply cord from the machine and go to the Step 2.
Step 2: Replace the machine socket, then turn the power switch on. If nothing is happened, turn off
the power switch and go to the Step 3.
Step 3: Replace the printed circuit board A, then turn the power switch on. If nothing is happened, turn off
the power switch and go to the Step 4.
Step 4: Replace the printed circuit board C, then turn the power switch on. If nothing is happened, turn off
the power switch and go to the Step 5.
Step 5: Replace the transformer unit, then turn the power switch on. If nothing is happened, turn off the
power switch and go to the Step 6.
Step 6: Replace the fuse.
If lamp does not light up when turning on the power switch, turn off the power switch. Then check the
following points:
Step 1: Replace the lamp bulb, then turn on the power switch. If nothing is happened, turn off the power
switch and no to the Step 2.
Step 2: Replace the printed circuit board A. Then turn on the power switch.
If LCD (Liquid Crystal Display) shows nothing when turning on the power switch, turn off the power switch
and check the following points:
Step 1: Replace the printed circuit board K. Then turn on the power switch, If nothing is happened, turn
off the power Switch. and go to the Step 2.
Step 2: Replace the printed circuit board A, Then turn on the power off the power switch.
If machine continue to sew the same part of a stitch, turn off the power switch and check the following
points:
Step 1: Replace the printed circuit board A. Then turn on the power switch. If nothing is happened, turn
off the power switch and go to the Step 2.
Step 2: Replace the stepping motor for zigzag and/or feed. If nothing is happened, turn off the power
switch and go to the Step 3.
Step 3: Replace the lamp bulb.
Operation Preparation (Use diagnosis chart).
Preparation
1.
Turn off the power switch.
2.
Set the bobbin winder spindle to the left.
3.
Raise the feed dog.
4.
Shift the speed setting lever to the left.
5.
Remove the presser foot and lift up the presser foot lever.
6.
Move the needle bar to up position.
7.
Connect the foot control to the machine.
If defect is found during the Step 01, turn off the power switch and take the following steps:
Step 1 Replace the printed circuit board F. Then check the machine.
Step 2: Replace the printed circuit boards K. Then check the machine.
Step 3: Replace the printed circuit boards A. Then check the machine.
If defect is found on the Step 02, turn off the power switch and take the following steps:
Step 1: Replace the printed circuit board F. Then check the machine.
Step 2: Replace the printed circuit board K. Then check the machine.
Step 3: Replace the printed circuit board A. Then check the machine.
To proceed further step, press.
"M" button on correct condition.
"C button on defect condition.
