Power Is Not Supplied - Star Micronics LS-5 SERIES Technical Manual

TROUBLESHOOTING

2-12-1. Power is not Supplied

Step
1 Check parts with different specifications for problems with
usage, defective installation, breakage, and deformation.
• Main parts to be checked:
(1) LVPS assy, (2) MCU PCB, (3) Feeder assy
(4) Optional feeder unit, (5) HVPS, (6) Fan, (7) Drive assy
(8) Pick up solenoid, (9) Console assy, (10) ROS assy
2 (Check LVPS assy)
Are the voltages as follows?
24VDC between J11-10PIN
J11-2PIN, J11-12PIN
5 VDC between J11-5PIN
J11-2PIN
• Disconnect one of the connectors (P/J11) from the MCU
PCB, and after about 5 minutes, turn on the power and check
the voltages.
Check before the output is stopped by the no-load status of the
LVPS assy (within 30 seconds of the power being turned on).
3 Does the fan rotate when the power is turned on?
4 (Check main logic board) *1
Disconnect connector (P/J5) and wait 2-3 minutes. Then turn
on the power and check to see if a display appears on the LCD
and if the fan rotates.
5 (Check HVPS) *2
Disconnect connector (P/J111) from the HVPS. Then turn on
the power and see if a display appears on the LCD and if the fan
rotates.
6 (Check fan) *2
Disconnect connector (P/J18) from the MCU PCB. Then turn
on the power and see if a display appears on the LCD and if the
fuser begins to warm up.
7 (Check drive assy) *2
Disconnect connector (P/J14) from the MCU PCB. Then turn
on the power and see if a display appears on the LCD and if the
fan rotates.
8 (Check pick up solenoid) *2
Disconnect connector (P/J17) from the MCU PCB. Then turn
on the power and see if a display appears on the LCD and if the
fan rotates.
Check
↔
J11-2PIN, J11-11PIN
↔
J11-2PIN
↔
J11-2PIN, J11-6PIN
– 94 –
Measure
YES
To step 2
To step 3
↔
↔
Replace MCU
PCB.
Check main logic
board.
Replace HVPS.
Replace fan.
Replace drive
assy.
Replace pick up
solenoid.
NO
Replace or
reinstall.
Replace LVPS
assy.
To step 4
To step 5
To step 6
(check all of the
following steps
with the connec-
tor disconnected
from the HVPS)
To step 7
To step 8
To step 9