HP Omnibook 800csct Service Manual

Part 2
Troubleshooting
· Power-On Self-Test
· OmniBook Diagnostics
· Desktop Management Interface
· System Configuration Utility
· Troubleshooting Tips 

4Power-On Self-Test
The OmniBook 800 BIOS includes a Power-On Self-Test (POST) facility that tests a number of
hardware and firmware items in the unit at each cold-start (BOOT or RESET).
The OmniBook self-test alone should not be used to diagnose a hardware problem.  If the self-
test results are absolutely clear and repeatable, confirm the results with at least two other non-
self-test failure symptoms.
Within POST, there are three kinds of messages:
· Error Messages – These messages appear when there...

5Display Codes
There are a number of Power On Self Test (POST) tests that are performed after the Beep Code
tests.  Failure of one or more of these tests will result in a displayed failure code (such as
03044).  It is extremely important not to interpret a failure code immediately as a hardware
failure.  The failure should be confirmed with a clean boot.  A clean boot is defined as pressing
the reset button after removing all accessories (including additional memory, floppy drive,
modems, PC cards, and...

6MessagePossible CauseKEYBOARD FAILUREThe keyboard failed to respond to the
RESET ID Command.MACHINE IS LOCKED - TURN KEYThe system will not continue the boot
sequence until you insert the key into the
key lock and turn it.NO BOOTABLE FLOPPY DRIVE 0 INSTALLEDNo bootable floppy drive was detected.
Possible solutions:  1) Power down the
system and check all appropriate
connections, cables, etc.  2) In
configurations where no floppy drive is
installed, run System Configuration Utility
and make sure the...

7OmniBook Diagnostics
The OmniBook diagnostics program provides an effective tool for diagnosing and isolating a
hardware problem.  The diagnostics software is intended for use in concert with additional
troubleshooting methods to accurately determine the cause of trouble.  The diagnostics program
is not designed for unassisted end customer use.
Diag is a DOS program developed to test the OmniBook 800 computer and docking station.  For
the most part Diag is a stand-alone program, testing components and...

8Figure 4 - Main Diagnostic Screen
Running selected tests
Tests may be initiated individually, or as a group.  Some tests may be run at different levels.  In
general, tests that can take a long time to be fully checked have levels that permit testing more
quickly while still providing a reasonable level of testing.  An unselected test has a 
before the test name.  A test at a quick level has a  before the test name.  A standard level
test has a  before the test name.  A long test has a  before the test...

9The name of the currently selected test is always shown inversed.
To help monitor the progress of testing, the LEDs (near the On button) blink about once per
second from green to off.  If a test has failed the LEDs blink from red to off.  When Diag finishes
testing, the LEDs blink rapidly.  If the system locks up for some reason, the LEDs generally stop
blinking.
Alternative methods for running tests
Individual tests may be run by moving the highlight to the desired test and running it.  Move the...

10Loop Back Connectors
In order to run the RS232 serial port, parallel port, and SCSI port self-test, a loop back connector
is needed.  The loop back may be placed on either the OmniBook port or at the end of the
corresponding cable.  This feature is also helpful in diagnosing a defective serial, parallel, or
SCSI cable.
Loop back connectors may be purchased or can easily be constructed.  The following illustrations
identify the correct pin-out configurations for the serial, parallel, and scsi loop back...

11PCMCIA Type III extender card
The PCMCIA test that makes use of SyCard Technology’s SyCard also requires an extender
card modified with two jumpers or with solder bridges.  In order for the Sycard to be detected,
CD1- and GND must be shorted together, and GND with CD2- must also be shorted together.
These are both pairs of endmost pins on the extender.  Once these jumpers or solder bridges are
added, the SyCard will successfully be detected and the SyCard tests can be performed.  See
Figure 8.Figure 8...

12Command line options
When Diag is run, either from the command line, or from a batch file, a number of switches (or
options) may be included to “customize” the operation of Diag.  Switches must be specified
separately, and must begin with either a - or a / character.  Upper or lower case may be used as
desired.  Switches may be used in any order.  The switches, a brief description, and their use are
described below:
Table 4 - Diagnotic Command Line OptionsSwitchDescription-?Report the standard command...