Troubleshooting; Error Messages; System Error Messages - NEC PowerMate Pro150 Series Service 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 4-2 describes possible system error
messages.
Table 4-3 describes possible PCI error messages.
Message
Address Line Short
Cache Memory Failure, Do
Not
Enable Cache
CMOS Battery Failed
CMOS Checksum Invalid
CMOS System Options Not
Set
CMOS Time and Date Not Set
Diskette Boot Failure
DMA Controller Error
Drive Not Ready Error
Floppy Disk Controller Failure
Floppy Drive A: Failure
Floppy Drive B: Failure
Table 4-2 System Error Messages
Description
Error in the address decoding circuitry on the system board.
Cache memory is defective. Replace the CPU.
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).
Run Setup to set the date and time (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.
Error in the DMA controller.
The BIOS cannot communicate with the diskette drive. Power
off the system and check all connections.
The BIOS cannot communicate with the diskette drive
controller. Power off the system and check all connections.
The BIOS cannot access the diskette drive A:. Power off the
system and check all connections.
The BIOS cannot access the diskette drive B:. Power off the
system and check all connections.
Maintenance and Troubleshooting 4-5