Troubleshooting; Error Messages - NEC POWERMATE P60D Service Manual

TROUBLESHOOTING

This subsection provides information that helps isolate and repair computer malfunctions at
the field level. Step-by-step instructions on diagnosing and solving computer hardware
problems are provided.
If disassembly is required, see Sections 5 and 6. Connector pin assignments are explained in
the Appendix A. Jumper settings are explained in Section 2.

Error Messages

Messages may appear when booting the system unit. Table Section 4-2 describes the possi-
ble error messages and their meanings.
Message
8042 Gate – A20 error
Address Line Short
C: Drive Error
C: Drive Failure
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
D: Drive Error
Table Section 4-2 System Error Messages
Description
Gate A20 on the keyboard controller (8042) is not working.
Replace the 8042.
Error in the address decoding circuitry on the system board.
Hard disk drive C: does not respond. Run the Setup to correct
this problem. Also, check the C: hard disk drive type in Setup
to make sure the hard disk drive type is correct.
Hard disk drive C: does not respond. Replace the hard disk
drive.
Cache memory is defective.
Most AT systems include two timers. There is an error in
Timer 2.
CMOS RAM is powered by a battery. The battery power is low.
Replace the RTC on the system board.
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 does not match the type
detected by the BIOS. Run Setup.
The graphics type in CMOS RAM does not match the type
detected by the BIOS. Run Setup.
The amount of memory on the system board is different than
the amount in CMOS RAM. Run Setup.
Run Setup to set the date and time in CMOS RAM.
Hard disk drive D: does not respond. Run the Setup to correct
this problem. Also, check the D: hard disk drive type in Setup
to make sure the hard disk drive type is correct.
Maintenance and Troubleshooting 4-5