Beep Codes; Diagnostic Beep Codes - NEC PowerMate Pro150 Series Service Manual

4-12 Maintenance and Troubleshooting
Problem
CD-ROM
Malfunction
(cont'd)
Communication
Error

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 4-5 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
Table 4-4 Problems and Solutions
Symptom
No sound from CDs.
No or bad data when
communicating.
Table 4-5 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.
Solution
1. Check that speaker power is on and
volume is adjusted.
2. Check audio software settings.
3. Check CD audio cable. Replace as
necessary.
4. .Replace CD-ROM reader.
5. Replace system board.
1. Check cable connections between
system board and device.
2. Check that the interface port is
selected.
3. Test or replace the device and
interface cable (see the device
documentation for troubleshooting).
4. Replace system board.