Cmos Battery Replacement - NEC POWERMATE P - SERVICE MANUAL 1995 Service And Reference Manual

4-12 Maintenance and Troubleshooting
Message
Processor Exception Interrupt
Error
Display Memory Read/Write
Error
ROM Checksum Error
CMOS Shutdown Register
Read/Write Error
Cache Error/External Cache
Bad

CMOS Battery Replacement

Remove the 3-volt lithium battery from system board as follows.
Turn off and unplug the system unit and any external option connected to it.
1.
2. Remove the system unit cover.
3. Locate the battery socket on the system board.
Table Section 4-8 Diagnostic Beep Codes
Beeps Description of Failure
7 The CPU generated an exception interrupt.
8 The system graphics 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 external cache is faulty.
Figure Section 4-4 Battery Socket Location