Troubleshooting (DPO7000 Series, MSO70000/C Series, DSA/DPO70000B/C Series)
BIOS Beep Codes
When the μAT X bo
ard powers on, a number of the BIOS checkpoints generate an
audible ‘beep’ code on failure using the standard PC speaker (also routed through
the board audio system). The beep codes are listed in the following table. Codes
are also written to I/O port 80h and the video adapters. External ROM modules
may issue a series of tones on error detection.
The BIOS generates one short beep if the power on self tests complete without
error.
If your instrument does not contain a speaker, attach a speaker to the
display-adapter board square pins to he ar the codes .
Table 4-13: 039-0173-xx and 065-0745-xx μATX beep codes
Item no. Beep code Error message
1
3 (long) Memory error (beep freq = 1280 Hz)
2
4 ( alter nating hi-low)
Thermal warning
(beep freq - high = 2 kHz, low = 1.5 kHz)
31
Refresh failure
42
Cannot reset parity
5
3
Memory failure, first 64 KB
64
Timer failure
75
Not used
86
Cannot toggle 8042 Gate A20
9
7
Exception interrupt error
10 8
Display memory R/W error
11 9 Not used
12 10
CMOS Shutdown register test error
13 11
Cache memory error
MSO70000/C, DSA70000B/C, DPO70000B/C, D PO7000, MSO5000, DPO5000 Series 4–41
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