Power Supply Circuit Abnormal - Star Micronics NX-1020 Technical Manual

TROUBLESHOOTING

4-2. Power Supply Circuit Abnormal

(1) Remove connector CN5 from the main logic board.
START
Fuse F1
is blown?
NO
30VAC and
5VAC are
supplied?
NO
Replace
Transformer
Check operation
END
YES
Replace Fuse F1
blown again?
YES
Connect the
connector CN5
is blown?
is blown?
YES
Fuse is
NO
The no load voltages are below:
J1-J2 of CN0 About 30VAC
J3-J4 of CN0 About 9VAC
YES
Fuse F2
NO
YES
Fuse F3
NO
– 66 –
Replace
Transformer
Check and replace
1) IC1
2) D1
3) DB1
Check and replace
1) IC2
2) DB2