Star Micronics NX-1020 - Power Supply Circuit Abnormal

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TROUBLESHOOTING
YES
4-2. Power Supply Circuit Abnormal
(1) Remove connector CN5 from the main logic board.
Replace Fuse F1
Fuse is
blown again?
NO
YES
YES
YES
YES
Check and replace
1) IC1
2) D1
3) DB1
Check and replace
1) IC2
2) DB2
START
Fuse F1
is blown?
NO
30VAC and
5VAC are
supplied?
NO
Replace
Transformer
Check operation
END
Connect the
connector CN5
Fuse F2
is blown?
NO
Fuse F3
is blown?
NO
Replace
Transformer
The no load voltages are below:
J1-J2 of CN0 About 30VAC
J3-J4 of CN0 About 9VAC