HP Omnibook 4000c Ct Service Manual

							___________31 Upper Case, Sound Board (PCB Assy PK-688/PK-AUD),
and PCA Display Connect PK-LSP
(HP Authorized Support Providers Only)
Required Equipment:
· Phillips Screwdriver
Components to remove prior Upper Case, Sound Board (PCB Assy PK-688/PK-
AUD), and PCA Display Connect PK-LSP:
1. HDD, FDD, and Battery
2. Icon Assembly and Display Module
3. Palm Rest Assembly
4. Keyboard Assembly
5. Power Board (optional)
Removal Procedure:
1. Remove Battery, Floppy Disk Drive, and Hard Disk Drive.
2. Follow the Icon Assembly and Display Module Removal Procedure to remove
these components.
3. Follow the Keyboard Removal Procedure.  Note, although the Sound Board
cannot be completely removed at this point, it is strategic to disconnect the
rightmost harness cable at this step (see Figure 9).
4. Additional maneuvering space may be gained by removing the Power Board,
however, it is not necessary to do so.
5. Remove the ISOB M2x6L Screw located on the left side of the Upper Case.  See
Figure 10 for location of this component.
6. Remove the Upper Case by gently prying up at the seam between the Upper
Case and Lower Case.  The Upper Case will then snap off.
7. At this point, the Upper Case will still have the Sound Board and the Microphone
Assembly attached.  The Microphone can simply be disconnected from the
Sound Board if necessary.  The Sound Board may be affixed with a drop of glue
to the Upper Case where the Audio Ports meet the plastic.  The Audio Ports can
be gently pried from the Upper Case plastic if necessary (see Figure 10).  Note,
that the Sound Board and Audio Ports are a single assembly.
8. Next, remove the three (3) ISOB M2.6x5L screws from the LSP-M/B Shielding
Plate and PCA Display Connect PK-LSP.  See Figure 10 for locations of these
components.
9. The LSP-M/B Shielding Plate can now be removed.
10. Remove the PCA Display Connect PK-LSP by gently rocking back and forth.
Replacement Procedure:
1. Simply reverse the above Removal Procedure.
2. Take note that to reinstall the Audio Ports onto the plastic of the Upper Case
does not require a drop of glue.  The one screw is sufficient.
3. The LSP-M/B Shielding Plate fits between the plastic of the Lower Case and the
strip of shielding affixed along the audio ports holes in the plastic of the Lower
Case. 
						

							___________32PCB Assy PK-
688/PK-Aud
(Sound Board)Screw ISOBM2x6LMicrophone AssemblyUpper CasePCA DisplayConnect PK-LSPScrew ISOB
M2.6x5L
Qty (3)LSP-M/BShielding PlatePCA Assy PK-DC
(Power Board)Screw ISOB
2.6x5LAudio Ports (part of
Sound Board
Assembly)
Figure 10 - Upper Case and Display Connect 
						

							___________33 Keyboard Grounding Plate, CPU, and System Board
(HP Authorized Service Providers Only)
Required Equipment:
· Phillips Screwdriver
· Nutdriver (5 mm or 3/16 in)
Components to remove prior Keyboard Grounding Plate, CPU, and System
Board:
1. HDD, FDD, and Battery
2. Icon Assembly and Display Module
3. Palm Rest Assembly
4. Keyboard Assembly
5. Power Board
6. Upper Case, Sound Board, and Display Connect
Removal Procedure:
1. Remove Battery, Floppy Disk Drive, and Hard Disk Drive.
2. Follow the Icon Assembly and Display Module Removal Procedure to remove
these components
3. Follow the Palm Rest and Keyboard Assembly Removal Procedures to remove
these components.
4. Remove the Power Board by gently rocking back and forth.
5. Remove the Upper Case, Sound Board, and Display Connect by following the
corresponding Removal Procedure.
6. Remove the K/B Grounding Plate by unfastening the three (3) ISOB M2.6x5L
screws and one (1) 10mm standoff.  See Figure 11 for locations of these
components.  Take note that the Track Ball and Sub Battery-M/B Harnesses
must be threaded through the K/B Grounding Plate before it can be freely
removed.
7. The CPU may now be removed by gently rocking back and forth.  Take care not
to dislodge the heat sink from the top of the CPU.  If needed, the CPU Shielding
Plate may also be removed at this point. 
						

							___________34Screw ISOBM2.6x5LStandoff 10mmK/B Grounding
PlateTrack Ball and
Sub Battery-M/B
HarnessesPCA Proc(CPU)Standoff 15mmScrew ISOB
M2.6x5L
Qty (2)PCA Main PK-486(System Board)PCMCIA ButtonAssemblyLower CaseCPU Shielding
Plate
Figure 11 - System Board and Keyboard Grounding Plate 
						

							___________35 Enhanced Port Replicator
(Exchange Assembly)
The Enhanced Port Replicator (EPR) for the OmniBook 4000 contains no field
replaceable components.  If any component of the EPR is defective, the entire unit
must be replaced.
Troubleshooting Tips:
· The OmniBook 4000 will only detect one pointing device at a time.  Therefore, if
an external mouse is connected to the EPR, the track ball will not be active.
· When an external mouse is detached, the pointing devices settings must be
manually updated in the Setup for the change to be detected.
· The EPR PCMCIA slots do not receive power when the OmniBook is in Suspend
mode. 
						

							___________36 Configuration and Setup
Main Configuration Screen
Pressing [fn][f2] invokes the BIOS setup and configuration utility.  Users can check
system configuration and changes settings using [f] keys from this screen.  This is
the most accurate place to check battery and system status.  Pressing [f3] from this
screen exits back to the current application. 
						

							___________37 Power Screen
The power screen contains the current power level of the main and auxiliary
battery.  If there is no auxiliary battery, the text is dimmed (or in a passive color).
Power conservation settings consists of the options shown.  When Custom is
selected, suspend after, hibernate after and HDD stop after settings can be
changed by the user (indicated again by the settings in brackets [  xxx  ]).  When
any of the other selections are chosen by the user, the system will show the
settings that are programmed by the system.
The hibernation setup area is shown to inform the user the size of the file used to
save the RAM image to disk.  There is no user selectable control in this area. 
						

							___________38 Power Configuration
To implement the power management capabilities, the following settings are set by
the user from the power setup screen.  The CPU doze will automatically occur and
will not be user selectable.
Setting:Parameters:DefaultComments:Power
Conservation
ModeAdvanced;
Standard; Off;
CustomAdvancedIn advanced mode the
user can not change the
settings,  they are preset.Suspend AfterDisable; Time
(1 - 15 minutes)2 minutesHow long the system will
stay in Run with (no
activity) until it suspends.
If disabled it will stay in
Run.Hibernate AfterDisable; Time
(5 - 120 minutes)30 minutesHow long the system will
be in the suspend state.  If
disabled it will stay in the
suspend state.HDD Stop AfterDisable; Time
(0.5 - 15 minutes)1 minuteHDD will turn off, system
has ability to run.  HDD
will spin up when access
required.Processor SpeedFast; SlowFastPCMCIA PowerDisable; EnableEnableEnable power to PCMCIA
each slot during suspend. 
						

							___________39 Power Defaults
Advanced, Standard, Off and Custom, power conservation default values are:AdvancedStandardOff:CustomSuspend After1 minute2 minutesDisabled1 minuteHibernate After:15 minutes60 minutesDisabled15 minutesHDD Stop After:30 secondsDisabledDisabled30 seconds 
						

							___________40 System Configuration
The system screen contains the processor and memory information for the user to
glance at.  It also allows the user to set the date and time. The real time clock is
not changed until the user exits the setup program.   The user can also enable or
disable the processor cache.
When the user decides to enable a password, a pop up window requests the old
password, new password and confirmation of the new password.  Hard drives or
mass storage are not affected by the password--only the turn-on condition.
Password is not tested at resume from suspend.