Beep Codes - NEC POWERMATE P60D Service Manual

Table Section 4-6 Problems and Solutions
Problem Symptom
Communication No or bad data when
error communicating.

Beep Codes

One beep indicates that the computer 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 per-
sists, see Table Section 4-7 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.
Table Section 4-7 Diagnostic Beep Codes
Message
Refresh failure
Parity error
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/external cache bad
Maintenance and Troubleshooting
Solution
1. Check cable connections between
system board and device.
2. Check that the interface port is
selected.
3. Test or replace device and interface
cable.
4. Replace system board.
Beeps Description of Failure
1 The memory refresh circuitry on the system board
is faulty.
2 Parity error in the first 64 KB of memory.
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 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.
4-11