Maintenance and Troubleshooting 4-5
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.
Table Section 4-2 System Error Messages
Message
Description
Address Line Short
Error in the address decoding circuitry on the system board.
Cache Memory Bad, Do Not
Enable Cache
Cache memory is defective. Replace it.
CH-2 Timer Error
There is an error in timer 2.
CMOS Battery State Low
CMOS RAM battery power is low. Replace the battery (see
battery replacement at the end of this section).
CMOS Checksum Failure
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 .
CMOS System Options Not
Set
The values stored in CMOS RAM are either corrupt or
nonexistent. Run Setup (see Section 2).
CMOS Display Type
Mismatch
The video type in CMOS RAM does not match the type
detected by the BIOS. Run Setup (see Section 2).
CMOS Memory Size
Mismatch
The amount of memory on the system board is different than
the amount in CMOS RAM. Run Setup (see Section 2).
CMOS Time and Date Not Set
Run Setup to reset (see Section 2).
Diskette Boot Failure
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.
Display Switch Not Proper
System video switch is set to either color or monochrome.
Turn the system off, set the switch, and turn the system on.
DMA Error
Error in the DMA controller.
DMA #1 Error
Error in the first DMA channel.
DMA #2 Error
Error in the second DMA channel.
FDD Controller Failure
The BIOS cannot communicate with the diskette drive
Summary of Contents for POWERMATE P - SERVICE MANUAL 1995
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