Beep Codes; Cmos Battery Replacement; Diagnostic Beep Codes - NEC POWERMATE PRO2180 - SERVICE MANUAL 1996 Service Manual

4-12 Maintenance and Troubleshooting

Beep Codes

One beep indicates that the system has completed its power-on self-test. If a long beep or a
series of long beeps occur, power off the computer and try again. If the long beeps persists,
see Table Section 4-8 for the diagnostic beep codes.
The beep codes are announced on the speaker only if a fatal failure is detected. For instance,
three long beeps indicates a failure in the first 64 K of RAM.
Message
Refresh Failure
Base 64 KB Memory Failure
Timer Not Operational
Processor Error
8042 – Gate A20 Failure
Processor Exception Interrupt
Error
Display Memory Read/Write
Error
ROM Checksum Error
CMOS Shutdown Register
Read/Write Error
Cache Error

CMOS Battery Replacement

Remove the 3-volt lithium battery from system board as follows.
1. Turn off and unplug the system unit and any external option connected to it.
Remove the system unit cover.
2.
Table Section 4-8 Diagnostic Beep Codes
Beeps Description of Failure
1 The memory refresh circuit on the system board is
faulty.
3 Memory failure in the first 64 KB.
4 Memory failure in the 64 KB of memory or timer 1
on the system board is not functioning.
5 The CPU on the system board generated an error.
6 The keyboard controller (8042) may be bad. The
BIOS cannot switch to protect mode.
7 The CPU generated an exception interrupt.
8 The system's video adapter is either missing or its
memory is faulty. This is not a fatal error.
9 ROM checksum value does not match the value
encoded in the BIOS.
10 The shutdown register for CMOS RAM failed.
11 The cache is faulty.