HP Omnibook 4000c Ct Service Manual

							___________21 Hard Disk Drive
(End User Replaceable)
The Hard Disk Drive Module is user replaceable.
To remove the Hard Disk Drive Module, remove the screw under the latch on the
hard drive.  Push the Hard Drive Module Forward - do not pull on the latch - it is not
strong enough, use the back edge of the module in front of the depression in the
bottom case instead.
Reverse the procedure for installation.Figure 3 - Hard Disk Drive 
						

							___________22 Small parts
(End User Replaceable)
The I/R lens, expansion door, I/O door,  Rubber feet, memory doors, and  PCMCIA
door are all replaceable.
The I/R lens snaps in and out from the inside of the I/O door.
To remove the I/O door, open it fully. Flex the door so that the center hinge
separates from the backcase. Continue to flex until side pins clear holes in back
case.  To reassemble, simply reverse the procedure.
The expansion door is removed by opening it fully and flexing it in the middle until
the pins in the backcase disengage from the slots in the side of the door.  To
reassemble, reverse the procedure.
The rubber feet are adhered to the bottom case with adhesive.
The PCMCIA door is remove in the same manner as the expansion door. 
						

							___________23 Icon Assembly and Display Module
(HP Authorized Support Providers Only)
To remove the display module on the OmniBook 4000C and CT  turn the unit over
and withdraw the two Phillips screws from the bottom back corners of the unit (see
diagram below).  This is not required if only the ICON assembly is to be removed.Display/ChassisScrewsFigure 4 - Display Screws 
						

							___________24 Turn the unit right side up and remove the Icon assembly by placing the thumbs on
each edge of the assembly and pushing lightly (see diagram below).  The front
edge of the Icon Assembly will lift up slightly.Figure 5 - Icon Assembly 
						

							___________25 Lift the display straight up about 1 inch.  The Icon Assembly will lift up with the
display.  Move the Icon assembly out of the way.  The cable from the Icon
Assembly to the PC board does not need to be removed if only the display is being
removed.  Otherwise, slide the connector sleeve foward to remove the Icon
Assembly cable.
Next, remove the two cables attaching the display module to the PC board.  Lastly,
remove the two screws attaching the grounding straps to the PC board.  The
display can now be removed the rest of the way.Display/Chassis
Screws
Figure 6 - Display Removal
To reinstall the display module or Icon Assembly, just reverse the above
procedure.  When reinstalling the Display Module, make sure that the two posts on
either side of the display line up parallel with their slots in the top case.  If they are
not parallel, the post will get caught inside the top case before the display is seated
completely.  If this happens, remove the display and line the posts up properly.
Also take care that the Icon Assembly flex cable is tucked inside of the “tunnel” of
the Icon Assembly.  This will prevent the cable from crimping and possibly
malfunctioning. 
						

							___________26 Palm Rest Assembly and Track Ball Assembly
(HP Authorized Support Providers Only)
Before removing the Palm Rest Assembly or Track Ball Assembly, the battery and
the floppy disk drive assembly (a second battery may be installed in to the floppy
drive bay)  must be removed.  See instructions for removal of these two modules.
In the floppy disk drive and battery bays are four Phillips screws, two in each bay.
Remove these four screws while the unit is upside down (see illustration below).Palm Rest
Screws (4)
Figure 7 - Lower Case Screws 
						

							___________27 Turn the unit right side up, open the lid and lift up on the palmrest.  Disconnect the
cable attaching the palmrest to the track ball assembly.
To remove the track ball assembly, disconnect the Track Ball Assembly cable and
remove the one screw that holds the Track Ball Assembly in place.  The Track Ball
Assembly then lifts out.Palm Rest
AssemblyTrack Ball
AssemblyScrew ISOBM2.6x5LSub-BatteryAssemblyFigure 8 - Palm Rest and Track Ball Assemblies
Reverse the procedure to install a new Palm Rest Assembly or Track Ball
Assembly. 
						

							___________28 Keyboard Assembly
(HP Authorized Support Providers Only)
Required Equipment:
· Phillips Screwdriver
Components to Remove Prior to Keyboard:
1. HDD, FDD, and Battery
2. Palm Rest Assembly (may remain connected)
3. Sound Board (PCB Assy PK-688/PK-AUD) (partial removal)
Removal Procedure:
1. Follow the instructions for removing Battery, Floppy Disk and Hard Drive.
2. Follow the Palm Rest Assembly Removal Procedure.  Note the Track Ball does
not need to be removed and the Palm Rest may be lifted out without being
disconnected.
3. The keyboard can then be lifted out by gently prying up on the front edge.
4. To gain access to the Keyboard flex cables, the Sound Board must be removed
(see Figure 9).  To remove the Sound Board, lift up on the sides of the board.
Note, the Sound Board cannot be completely disconnected at this point - the
Upper Cover must be removed to gain full access to the Sound Board.
5. Disconnect the Keyboard flex cables from the zero force insertion slots.
Replacement Procedure:
1. Reverse the procedure to install a new keyboard. 
						

							___________29Figure 9 - Keyboard and Sound Board 
						

							___________30 Power Board (PCA Assy PK-DC)
(HP Authorized Support Providers Only)
Required Equipment:
· Phillips Screwdriver
Components to remove prior Power Board (PCA Assy PK-DC):
1. HDD, FDD, and Battery
2. Palm Rest Assembly (may remain connected)
3. Keyboard (may remain connected)
Removal Procedure:
1. Remove Battery, Floppy Disk Drive, and Hard Disk Drive.
2. Follow the Palm Rest Assembly Removal Procedure to remove this component.
Note, the Palm Rest only needs to be lifted out; it may remain connected.
3. Follow the Keyboard Removal Procedure.  Note, the Keyboard only needs to be
lifted out; it may remain connected.
4. Remove the Power Board by gently rocking back and forth.  See Figure 10 for
component location.
Replacement Procedure:
1. Simply reverse the above Removal Procedure.