Power Supply Circuit Abnormal - Star Micronics LC-1011C Technical Manual

TROUBLESHOOTING

4-2. Power Supply Circuit Abnormal

(1) Remove connector CN5 from the main logic board.
START
Fuse F1
is blown?
NO
Fuse F2 is
blown?
NO
Check operation
END
YES
Replace Fuse F1
blown again?
The no load voltages are below;
VH(25~45V) Line
VL(5V) Line
YES
Replace Fuse F2
blown again?
YES
Fuse is
NO
25~45V
+5V 5%
Fuse is YES
NO
– 56 –
Replace
Power supply unit
Between Pin 5 and Pin 3 of CN101
Between Pin 1 and Pin 2 of CN101
Check and 5V line of
the main logic board