NEC POWERMATE VE - SERVICE MANUAL 05-1996 Service Manual page 97

Table Section 4-2 Problems and Solutions
Problem Symptom
No power Power lamp on computer
status panel will not light.
Power supply Any one or more of the
malfunction following conditions could
occur:
Front panel lamps out,
diskette and/or hard drives do
not spin, monitor blank,
interface ports not working,
and keyboard lamp out and/or
cannot input from keyboard.
Maintenance and Troubleshooting
Solution
1. Check that the power cord is plugged
into the AC connector on the computer.
Check that the other end of the cord is
plugged into a live properly grounded AC
power outlet.
2. Check cable connections between
power supply and system board.
3. Systematically eliminate possible
shorted PCBs by removing cables and
expansion boards.
4. Check the +5 and +12 power supply
voltages (see Appendix A, Connector Pin
Assignments). Measure voltages with the
system board installed.
5. Replace power supply.
6. Replace system board.
1. Perform steps 1 through 4 listed in this
table under No Power.
2. Check power supply voltages. Voltages
should be measured with a load on them
(system board plugged in). See Appendix
A for connector pin assignments and
Section 1 for the power supply
specifications.
3. Replace power supply.
4-5