HP Omnibook 800csct Service Manual

							43SymptomCall CenterRepair Centercomparing it to another OB800?
Is customer a heavy user?Some or all keys not workingRemove the 2 keyboard screws
and check keyboard flex cable
connections visually.  If not
aligned properly in the
connector, send in for repair.
These connectors can be
damaged if the proper tool is not
used to disconnect the cables.Check keyboard flex
connection.  If OK, try another
keyboard.  If still bad, replace
logic board.Computer noisy but workingHDD “clunking or scratchy”Was the computer dropped?
Back the drive up immediately!Replace HD.  Check computer
case for evidence of customer
abuse.Buzzing or whiningBack the drive up immediately!
Is the sound present when HD
not spinning?  Is there a
PCMCIA hard drive in the slot
that is making the noise?  Does
pressing a key cause the sound
to change?  If yes, then this is
probably power supply noise.
Only if it is very objectionable
should computer be sent in for
repair.Replace logic board.MiscellaneousComputer does not resume
after:
· Being suspended
· A reset
· An alarm from an
applicationTry using reset button.  Check
BIOS version and install latest
(v1.02.00).  Otherwise, send in
for repair.Replace CPU board (see
Service Note 800-02A).File corruptionRun a virus scan program.  Boot
to DOS and run CHKDSK to look
for lost clusters, cross-linked
chains.  If present, run CHKDSK
/f to fix.  Then run Scandisk
surface scan to test for damaged
HD platter.  Use Recovery CD to
recover Omnibook files
corrupted.  If computer still has
problems, return for repair.Try steps at left.  If keyboard
support plate of old design
(without notch), add I/O
insulator to plate above HD
connector (see Service Note
800-09).  Check for latest BIOS
(v 1.02.00). Run a virus
checker.Computer gets hotIt is normal for computer to get
hot, especially when charging.
DOS applications (games?) and
poorly written Windows
applications can contribute.  Run
System Monitor and look at CPU
activity.  Suspend applications
that drive CPU usage toward
100%.  PCMCIA modem cards
normally get very hot when in
use.Computer won’t time outDoes the cursor  jitter?  If so,Does the cursor jitter?  This will 
						

							44SymptomCall CenterRepair Center(i.e., doesn’t automatically
turn off after a preset
interval)send in for repair.  If not, check
the timeout settings in Omnibook
Power Management in the
Control Panel.  Set hard drive
timeout = computer timeout.  A
future BIOS will address this
issue.prevent timeout.  If so, replace
paw active assembly.Computer pauses and won’t
permit kybd or mouse input
for a few secondsThis is probably normal W95
behavior.  The operating system
processes events in the
background and sometimes
these interfere with the
responsiveness of the
application.
If the hard disk has spun down to
conserve power, it can take up to
five seconds to spin back up.
You can hear this happen.  You
can set the hard drive timeout
equal to the computer timeout
such that this does not happen
often.
COE users should use COE
Disconnect and recognize that
various COE activities (like virus
scans) are happening in the
background.
Some file browsers (like the one
in PowerPoint in the Insert
Picture dialog box) will process
and display a graphic image
before they respond to keys.
This can take twenty seconds.
File browsers may wait for
broken/non-existent network
connections to time out.PCMCIA cards recognized
but not available for use.If this occurs with PCMCIA HD,
flash card or LAN card, it may be
the computer has run out of
IRQ’s.  Check in System
Properties for available IRQ’s.  If
card is an ATA card, install new
driver, SSHP800.VXD (see
Service Note 800-03).  Also try
the card in another machine
and/or run diagnostics on the
card.If card is an ATA card, install
new driver, SSHP800.VXD
(see Service Note 800-03).If HP COE customer,
modems/PCMCIA cards not
recognized consistentlySee local IT dept for a PC COE
Reliability Tracker patch which
solves this problem.Difficult to install RAM
expansion doorWas RAM expansion just
added?  Does door work without
RAM expansion?  If yes to both,
send in RAM for replacement.Was RAM expansion just
added?  Does door work
without RAM expansion?  See
Service Note 800-11. 
						

							45SymptomCall CenterRepair CenterDock latch jammed, won’t
permit computer to dockTry manual undocking to get the
system apart.  See dock User’s
Guide (pg 1-13 English or
appropriate language’s page) for
procedure.  Send in dock for
repair.Replace dockClock won’t keep timeIn Control Panel, click on Power.
Power Management must be set
to Advanced.  Has the computer
ever failed to resume and had a
dead battery (causing the clock
to stop)?  If so, replace the
BIOS.Verify that Power Management
is set to Advanced.  Test clock
accuracy with unit suspended.
If still not accurate, replace
logic and retest.Computer runs slowSee: “Computer pauses and
won’t permit keyboard or mouse
input for a few seconds.”
Make sure cache is enabled in
SCU.  If yes, then
press [Fn][+].  One beep
indicates slow mode, 2 beeps
fast mode.  If problem persists,
send in for repair.Verify problem and replace
CPU first, then logic board.Hard drive errorsCan use Spin Rite 4 to
thoroughly diagnose the
problem.RAM module does not fit
into OmniBook connectorIf the RAM module does not
connect 1000% try another
module.  A few of the RAM
modules received from the
vendor are out of alignment.CD ROM Drive Troubleshooting
The following table lists several troubleshooting tips specifically for the optional CD-ROM drive.
Table 16 - CD-ROM Troubleshooting TipsTroublePossible CausesSolutions· The POWER switch is
ON, but nothing appears
on the CD-ROM display.· The power cable is not
plugged into the
OmniBook connector or
the DC IN jack.
· The batteries are not
installed correctly or are
dead.· Plug in the power cable correctly.
· Install the batteries correctly or
replace with new ones. 
						

							46TroublePossible CausesSolutions· The CD-ROM drive is not
accessible from the
OmniBook.· For Windows 95, the CD-
ROM drive was not turned
on when you plugged it
into the OmniBook.
· For Windows for
Workgroups, the CD-ROM
drive was not turned on
when you rebooted the
OmniBook.· Turn on the drive, then click Start,
Eject PC. When prompted,  unplug
and reconnect the SCSI adapter
cable to the OmniBook.
· Turn on the drive, then exit
Windows and press
CTRL+ALT+DEL to reboot.· The data from the CD is
not properly transmitted
to the OmniBook.· The SCSI adapter cable is
not connected properly.
· Devices with duplicate
SCSI ID numbers are
connected to the
OmniBook.
· SCSI termination on the
CD-ROM drive is OFF.
· There is a problem with
the OmniBook software.· Connect the SCSI adapter cable
correctly.
· Make sure each SCSI device
connected to the OmniBook has a
unique ID number.
· Change the terminator switch
(switch 4) on the CD-ROM drive
from OFF to ON.
· See the OmniBook User’s Guide.· A “no dISC” message
appears on the display
after inserting a CD, the
sound skips, or data can
not be read.· The CD is upside down.
· The CD is dirty.
· The CD is damaged.
· There is moisture on the
CD-ROM drive or the CD,
possibly due to
temperature change
condensation.· Reinsert the CD with the label side
up.
· Clean the CD with a soft, dry cloth.
· Replace with new CD.
· Remove the CD from the CD-ROM
drive and do not use for 1 hour.· The CD-ROM drive does
not play sound.· Headphones or amplified
speakers are not
connected to the CD-ROM
drive.
· VOLUME control is set to
“0”.· Connect the headphones or
amplified speakers to the CD-ROM
drive PHONES jack.
· Set the VOLUME control to a
higher number.· The control buttons do
not function.· CD-ROM drive has been
playing audio CD
controlled by OmniBook
software.· Open and close the disk cover.· The control buttons and
POWER switch do not
function. · Disconnect the CD-ROM power
cable and remove the batteries,
then reconnect the power cable
and reinstall the batteries.Resolving Docking Station Operating Problems
Below are several scenarios of Docking Station operating problems.  Possible causes and
troubleshooting tips are provided for each.
If a serial or parallel device, external display, or floppy drive doesn’t work
· Make sure the OmniBook is fully inserted in the docking system. Connection should be snug.
· If the green light on the docking system isn’t on, check power to the docking system, then try
undocking and docking again.
If an external PS/2 mouse or keyboard doesn’t work
· Make sure the OmniBook is fully inserted in the docking system.  Connection should be
snug. 
						

							47· Make sure the mouse is plugged into the correct port. The mouse and keyboard ports look
the same.
· Turn the system off and on.
· Reboot the system.
· Undock the OmniBook, unplug and reconnect the ac adapter, then dock again.
If network connections don’t work
· Make sure that the LAN cable is connected.
· You normally lose connections when you turn off the system or undock.  See if your network
software has a reconnect feature.
· Check your configuration files to make sure that the network drivers are properly installed.
· If the green light on the docking system isn’t on, check power to the docking system, then try
undocking and docking again.
· Check that there is no address or interrupt conflict. Check these settings on the network
board—or, if the board has configuration software, check the settings using that software—
see the manual for the network board. Also check these settings in your network software.
If SCSI devices don’t work
· Try rebooting and selecting a startup option that loads the SCSI drivers.
· Check the device id for conflicts.
· Make sure you turn on the SCSI devices before you reboot the system. Theyre configured at
boot time.
· Check your connections and SCSI termination.
· Check your configuration files to make sure that the SCSI drivers are properly installed.
· Try pushing the OmniBook into the docking system a bit harder.
· If the green light on the docking system isn’t on, check power to the docking system, then try
undocking and docking again.
· Check that there is no address or interrupt conflict. The SCSI interface normally uses I/O
address 3100F and interrupt 10.
If a network-enabled system locks up when rebooting
The following hints apply to Windows for Workgroups only:
· Edit AUTOEXEC.BAT to disable Windows for Workgroups network support for all non-
network startup options. Add the /N switch to the WIN command (win /n) for each of the non-
network options.
· Edit CONFIG.SYS and AUTOEXEC.BAT to load network drivers only for the “Docking
system” startup option, and not for undocked startup options.
For other operating systems:
· Check any available online tools—Device Wizard in Windows 95, for example—or check
with your system administrator.
Resolving OmniBook Docking Problems
Below are several scenarios of problems that may occur when docking the OmniBook.  Possible
causes and troubleshooting tips are provided for each.
If your docking password isn’t accepted
· Check whether Num Lock is off.
· If you’ve forgotten your password, have your OmniBook at hand and call Hewlett-Packard
support. See your OmniBook Support and Service booklet. 
						

							48If the OmniBook isn’t released after pressing the Undock button
· If you’re using a password, make sure it’s accepted.
· If you’re prompted about shutting down devices, and if no applications are using those
devices, press ENTER. Otherwise, close those applications and try undocking again.
· To override the undocking software, press a paper clip or other thin object into the security
opening in the docking system. Hold it in while sliding one release latch forward. 
						

							Part 3
Hardware Repair
· Battery
· Memory
· Hard Disk Drive
· Mouse
· Small Parts
· Keyboard
· Display
· CPU
· Logic PCA
· Paw Active
· Other Components and Accessories
CAUTION:Always provide proper grounding when performing any of the
following repairs.  An electrostatic discharge may cause irreparable
damage to the OmniBook and its components 
						

							50Battery
(End User Replaceable)
WARNING:Do not mutilate, puncture, or dispose of batteries in fire.  The batteries can
burst or explode, releasing hazardous chemicals.  A rechargeable battery
pack must be recycled or disposed of properly.
Required Equipment
· none
Removal Procedure
1. Turn the OmniBook off.  If ac power is plugged in, don’t remove the ac power while the
battery is out.
2. Turn the unit over and slide the two latches away from body of battery and lift the battery
out.  See Figure 15.
Replacement Procedure
1. Insert the new battery pack so the metal battery contacts on the pack line up with the
contacts in the compartment, then latch the cover.Figure 15 - Removing the Battery 
						

							51Memory
(End User Replaceable)
Required Equipment
· none
CAUTION:To avoid damage due to electrostatic discharge, handle the memory module
by the edges only.
Removal Procedure
1. Exit all applications, including Windows.
2. Remove the ac adapter and battery from the OmniBook.
3. Turn the unit upside down and slide the memory cover off by using the two finger grips. See
Figure 18 on page 52.
4. To remove the Memory Module, gently lift up the front of the module to disengage the pins.
CAUTION:If the memory module is an older model of the 32-MB RAM (see Figure 17)
take care not to crimp the flex cable end when removing or replacing.Figure 16 - 8- and 16-MB Memory ModulesFigure 17 - New and Old 32-MB Memory Module (respectively) 
						

							52Replacement Procedure
1. To replace, position the non-connector end first, then press the front of the module down into
the connector.
CAUTION:Apply pressure to the memory module only on the connector to avoid
damaging the circuit board.Figure 18 - Removing the Memory Module