Diagnosing And Solving Problems - NEC POWERMATE P - SERVICE MANUAL 1996 Service And Reference Manual

4-6 Maintenance and Troubleshooting
Table Section 4-2 PowerMate P System Error Messages
Message
Parity Error ????
Message
Memory Parity Error at xxxxx
I/O Card Parity Error at xxxxx
DMA Bus Time-out

Diagnosing and Solving Problems

One beep indicates that the system has completed its POST test. If intermittent beeping
occurs, power off the system and try again. If the beeping persists, see
ble summarizes problems that may develop during system operation and lists (in sequential
order) suggested corrective actions.
Problem
No power
Description
XXXX is the hex address where the error occurred.
Parity error in system memory at an unknown address.
Table Section 4-4 ISA NMI Error Messages
Description
Memory failed. If the memory location can be determined, it is
displayed as xxxxx. If not, the message is Memory Parity
Error ????.
An expansion card failed. If the address can be determined, it is
displayed as xxxxx. If not, the message is I/O Card Parity Error
????.
A device has driven the signal for more than 7.8 microseconds.
Table Section 4-6 Problems and Solutions
Symptom
Power lamp on computer status
panel will not light.
. The ta-
Table Section 4-6
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).