Power Supply Circuit Abnormal. Star Micronics LC-200, NX-1020

TROUBLESHOOTING

4-2. Power Supply Circuit Abnormal

(1) Remove connector CN5 from the main logic board.

START

Fuse F1 is blown?

NO

YES

Replace Fuse F1

Fuse is blown again?

NO

YES

Replace

Transformer

30VAC and

5VAC are supplied?

NO

Replace

Transformer

YES

Connect the connector CN5

Fuse F2 is blown?

NO

Fuse F3 is blown?

NO

The no load voltages are below:

J1-J2 of CN0 About 30VAC

J3-J4 of CN0 About 9VAC

YES

YES

Check and replace

1) IC1

2) D1

3) DB1

Check and replace

1) IC2

2) DB2

Check operation

END

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