Troubleshooting; Error Messages - NEC POWERMATE P - SERVICE MANUAL 1995 Service And Reference Manual

TROUBLESHOOTING

This subsection provides information that helps isolate and repair system malfunctions at the
field level. Step-by-step instructions for diagnosing and solving system hardware problems
are provided.
If disassembly is required, see Section 5. Connector pin assignments are given in Appendix
A. Switch settings are given in Appendix B.

Error Messages

Messages may appear when running NEC utilities. Table Section 4-2 describes possible
system error and warning messages. Table Section 4-4 describes possible ISA NMI error
messages.
Message
Address Line Short
Cache Memory Bad, Do Not
Enable Cache
CH-2 Timer Error
CMOS Battery State Low
CMOS Checksum Failure
CMOS System Options Not
Set
CMOS Display Type
Mismatch
CMOS Memory Size
Mismatch
CMOS Time and Date Not Set
Diskette Boot Failure
Display Switch Not Proper
DMA Error
DMA #1 Error
DMA #2 Error
FDD Controller Failure
Table Section 4-2 System Error Messages
Description
Error in the address decoding circuitry on the system board.
Cache memory is defective. Replace it.
There is an error in timer 2.
CMOS RAM battery power is low. Replace the battery (see
battery replacement at the end of this section).
After CMOS RAM values are saved, a checksum value is
generated for error checking. The previous value is different
from the current value. Run Setup .
The values stored in CMOS RAM are either corrupt or
nonexistent. Run Setup (see Section 2).
The video type in CMOS RAM does not match the type
detected by the BIOS. Run Setup (see Section 2).
The amount of memory on the system board is different than
the amount in CMOS RAM. Run Setup (see Section 2).
Run Setup to reset (see Section 2).
The boot disk in drive A is corrupt and cannot be used to boot
the system. Use another boot disk and follow the screen
instructions.
System video switch is set to either color or monochrome.
Turn the system off, set the switch, and turn the system on.
Error in the DMA controller.
Error in the first DMA channel.
Error in the second DMA channel.
The BIOS cannot communicate with the diskette drive
Maintenance and Troubleshooting 4-5