Power Supply Circuit Abnormal - Star Micronics LC-4511 Technical Manual

TROUBLESHOOTING

4-2. Power Supply Circuit Abnormal

(1) Remove connector CN101 from power supply unit.
START
Fuse F1
is blown?
NO
Check the 5V line of the
main logic board.
END
YES
Replace Fuse F1
blown again?
The no load voltages are below;
LC-4511 +33V Line +33V ± 5%
LC-4521 +40V Line +40V ± 5%
YES
Fuse is
NO
+5V Line +5V ± 5%
– 64 –
Replace
1) Power supply unit
Between Pin 4 and Pin 5 of CN1
Between Pin 1 and Pin 2 of CN1