Beep Codes; Beep Code Descriptions - NEC SP B-Series Service And Reference Manual

Problem
Communication error

Beep Codes

During boot up, the computer performs a series of POST (Power On Self Test)
routines. A beep code may appear when an error is detected. There are fatal and
nonfatal errors. The fatal errors include BIOS, CMOS, DMA, RAM, video, and
keyboard controller errors. The nonfatal errors include timer tick interrupt,
shutdown test, unexpected interrupt in protected mode, gate A20, RAM test,
interval timer channel 2 test, clock, serial and parallel port test, numeric
processor, system board select, and extended CMOS RAM.
The following table describes the beep codes.
Beeps
1-2
1-2-2-3
1-3-1-1
1-3-1-3
1-3-3-1
1-3-3-2
1-3-3-3
1-3-4-1
1-3-4-3
1-4-1-1
2-1-2-2
2-1-2-3
2-2-3-1
2-2-4-1
Problems and Solutions
Symptom
No or bad data when
communicating.

Beep Code Descriptions

Description
Search for option ROMs
BIOS ROM checksum
Test DRAM refresh
Test keyboard controller
Autosize DRAM
Initialize POST memory manager
Clear 512 KB base RAM
RAM failure on address line xxxx
RAM failure on data bits xxxx of low byte of memory bus
RAM failure on data bits xxxx of high byte of memory bus
POST device initialization
Check ROM copyright notice
Test for unexpected interrupts
Test RAM between 512 KB and 640 KB
Solution
Check cable connections between the
system board and device.
Check that the interface port is selected.
Test or replace the device and interface
cable (see the device documentation for
troubleshooting).
Replace the system board.
Maintenance and Troubleshooting 4-9