Figure 3-3. Serial And Parallel Loopback Connectors; Table 3-3. Omnibook Diagnostic Error Codes - HP OmniBook 900 Service Manual

Note that the serial and parallel port tests are more thorough if you connect a loop-back connector to
the port before running the test for that port. See the wiring diagrams below.
Interpreting the Results
The following table lists test groups, error codes, and suggestions for follow-up actions. Consider
these suggestions in combination with other troubleshooting information.
Code Suggestions
System Tests
0001h - Reseat or replace the CPU module.
0008h
0009h Replace the motherboard.
0010h - Reseat or replace the CPU module.
002Fh
0030h - Replace the motherboard.
0040h
0041h Unrecognized interrupts. Run BIOS Setup and
check IRQ assignments for all devices.
0050h - Replace the motherboard.
0070h
0071h Bad CMOS checksum. Reset the system, then
run BIOS Setup and check settings. Replace
the motherboard.
0072h Configuration mismatch in CMOS. Reset the
system, then run BIOS Setup and check
settings. Replace the motherboard.
0073h Bad CMOS RAM size. Reset the system, then
run BIOS Setup and check settings. Replace
the motherboard.
0074h Bad CMOS time. Reset the system, then run
BIOS Setup and check settings. Replace the
motherboard.
0075h - Reset the system. Replace the motherboard.
0076h
0077h Replace the motherboard.
0078h Bad CMOS checksum. Reset the system, then
run BIOS Setup and check settings. Replace
the motherboard.
0079h Replace the motherboard.
0083h - Replace the BIOS IC. Replace the
0086h motherboard.
0087h Replace the motherboard.
0088h Replace the BIOS IC.
3-14 Troubleshooting and Diagnostics
5
9
6
1

Figure 3-3. Serial and Parallel Loopback Connectors

Table 3-3. OmniBook Diagnostic Error Codes

13
25
These connections
are not used.
Diodes are 1N4004 or equivalent
(I =1A, V
F
14
1
Code Suggestions
008Ah Replace the motherboard..
0090h - Replace the BIOS IC. Replace the
009Eh motherboard.
009Fh Insufficient DOS memory. Load fewer device
drivers.
00A0h No repair. (ESCD not supported.)
00A1h Replace the BIOS IC. Replace the
motherboard.
00A2h - No repair. (ESCD not supported.)
00A3h
00A4h Replace the BIOS IC.
00A5h - No repair. (ESCD not supported.)
00A6h
00A7h Replace the BIOS IC. Replace the
motherboard.
00C0h - Replace the CPU module.
00CCh
00FFh Rerun the test. (Possible diagnostic
programming error.)
Memory Tests
The addresses below are absolute (32-bit) addresses.
These addresses are not in the segment:offset format.
0100h - Replace the motherboard.
0101h
0102h Replace the BIOS IC. Replace the
motherboard.
0120h - For 01FFFFFFh (OB900†) or 03FFFFFFh
0150h (OB900B) and below, replace the motherboard.
Above that, replace the RAM board (each
01000000h represents 16MB).
0160h Address bus short. Remove any RAM board
and rerun the test. Check the CPU module for
shorts. Replace the motherboard.
0170h - Replace the motherboard.
0172h
=1V@1A, V =30-400V)
F R
HP OmniBook 900