HP Omnibook 800csct Service Manual

							63Assembly can then be removed with the CPU still attached to the underside of the
Keyboard Support Plate.  This avoids causing damage to the CPU or Logic PCA.
 
6. Close the cover and gently pry the Top Case and Display Assembly from the Bottom Case
along the case seam.  See Figure 34 on page 64 and Figure 35 on page 65.  Take caution
of the Display Flex Cable(s) still connected to the Bottom Case, as it is the only
component now holding the Top Case and Display Assembly to the Bottom Case; do
not lay the Top Case and Display Assembly down at this point.
CAUTION:To avoid damage to the display cables, take care not to pull the cables out
of the connector while prying open the case.Figure 33 - Keyboard Support Plate ScrewsF1360 onlyF1171 - F1175M2.0x0.4x4.5
qty 2
1.5-3.0 in-lb
(p/n 0515-2853) M2.0x0.4x11.5
qty 2
1.5-3.0 in-lb
(p/n 0515-2920)
M2.0x0.4x3.5
qty 1
1.5-3.0 in-lb
(p/n 0515-2921) 
						

							647. Note -- TFT displays (OmniBook 800CT) have two Display Flex Cables, while DSTN
displays (OmniBook 800CS) only have one.  Take care to properly remove both cables on
TFT units (the smaller cable may be hidden under the larger cable).  While still supporting
the Top Case and Display Assembly, remove the Display Flex Cable(s) from the connector
slot(s).Figure 34 - Display Flex Cables 
						

							658. To separate the Display from the Top Case, thread the Display Flex Cable(s) through the
opening of the Top Case.
Replacement Procedure
1. If the replacement Display arrived without an Intel Inside sticker, one will need to be placed
equidistant between the edges of the Display.  For the F1360 OmniBooks, the sticker is
placed about 7mm above the hinge.  For F1171 - F1175 OmniBooks, the sticker is placed
about 10mm above the hinge.  See Figure 36 for examples.Figure 35 - Top Case and Display Removal 
						

							66 
 
2. Thread the Display Flex Cable(s) of the replacement Display through the opening in the Top
Case and “close” the assembly comprising of the Top Case and Display Assembly.
3. Firmly place the Display Flex Cables(s) into the connector(s) on the Logic PCA.
4. Snap the Top Case and Display assembly in place and replace the keyboard support screws.
Note – For F1360 only, the two long screws MUST be replaced before the short screw.
CAUTION:Use care when replacing the top case and display assembly so as not to
pinch the display flex cables between the top case I/O backplane.  Always
inspect the back seam of the OmniBook to ensure the cables are not
pinched.
5. Replace the remainder of the components and reboot.Figure 36 - Intel Inside Sticker PlacementIntel Inside
Sticker for
F1360 only
(p/n 7121-7455)Intel Inside
Sticker for
F1171 - F1175
(p/n 5182-5113) 
						

							67CPU
(HP Authorized Service Providers Only)
Required Equipment
· Torx #6 screwdriver
Removal Procedure
1. Follow the Display Removal Procedure to gain access to the CPU.
2. Remove the two CPU screws (see Figure 37).
3. Gently rock the CPU back and forth from front to back to remove from the connector.
Replacement Procedure
1. Ensure the CPU Insulator is positioned over the CPU connector on the Logic PCA.
2. Position the replacement CPU over the connector on the Logic PCA and press firmly but
gently.  For F1360 units, please refer to the Heat Transfer Disk information on page 68.
 
CAUTION:To avoid damage, apply pressure to the CPU only directly above the
connector.
 
3. Replace the remainder of the components and reboot.Figure 37 - Removing the CPUCPU Screws
M1.6x0.35x4.0mm
1.0-2.0 in-lb
(p/n 0515-2852)
CPU Insulator
(p/n F1360-20007) CPU 
						

							68Heat Transfer Disk
(The following information applies to F1360 units only.)
With each replacement of the CPU, a new Heat Transfer Disk must be placed on the underside
of the Top Case.  See Figure 38.  Simply pull back the Keyboard Support Insulator, remove the
old Heat Transfer Disk, center the new Heat Transfer Disk in the indentation and reposition the
Insulator.  Ensure the rectangle opening in the Insulator is positioned squarely over the Heat
Transfer Disk so that the edges of the Insulator opening retain the disk.
The heat generated by the CPU must be transferred through the CPU Thermal Coupling to the
Heat Transfer Disk.  See Figure 39.  The material used to facilitate the heat transfer is a paraffin-
based thermally conductive wax.  When heated, the wax on the disk melts and flows to fill in
thermally restrictive air gaps between the Top Case and the CPU.Figure 38 - Heat Transfer Disk and Keyboard Support InsulatorFigure 39 - CPU Thermal
CouplingKeyboard Support Insulator
(p/n F1360-20004)
CPU Thermal CouplingHeat Transfer Disk
(p/n F1360-20006) 
						

							69Under normal conditions, it is important not to disturb the wax residue on the Top Case and
CPU.  If the Top Case is replaced, it will have a new Heat Transfer Disk already in place on the
Keyboard Support Plate.  However, to ensure the integrity of the heat transfer, this Heat Transfer
Disk should be replaced with a new disk after installation of the new Top Case Assembly. 
						

							70Logic PCA Board
(HP Authorized Service Providers Only)
Electronic Serial Number
The OmniBook 800 (F1360 only) is shipped with an electronic serial number programmed in
EEPROM on the Logic PCA Board.  This built-in serial number will help MIS managers in
tracking assets and software configuration.  Serial numbers can also be used for security and in
tracking lost or stolen notebooks.  The Desktop Management Interface (DMI) TopTools
application shipped with the OmniBook can be used to read the serial number locally and across
a network.
Programming the Electronic Serial Number
All replacement Logic PCA Boards will arrive with a temporary serial number programmed in
EEPROM.  The following procedure provides the steps necessary to reprogram the electronic
serial number.
1. After installation of the replacement Logic PCA Board and upon reboot, the OmniBook will
halt with this prompt:
INVALID ELECTRONIC SERIAL NUMBER
PRESS ANY KEY TO CONTINUE
2. After a key is pressed, the OmniBook will continue a normal boot process.  The HP
Authorized Service Provider must program a valid serial number before the OmniBook can
be shipped to the customer.
3. Run the ESN.EXE program located in the c:\omnibook\diag directory.
4. The ESN program will prompt for a valid serial number.
5. Enter the serial number located on the bottom of the OmniBook.  The ESN program will burn
the serial number into EEPROM.
Overriding an Incorrect Electronic Serial Number
If an incorrect serial number is inadvertently burned into EEPROM, it can be corrected.  Perform
the following steps:
1. Run the ESN.EXE program located in the c:\omnibook\diag directory.
2. The ESN program will prompt to confirm that the serial number is incorrect.  It will then
generate a five (5) digit number key.
3. The HP Authorized Service Provider must contact Hewlett-Packard Technical Support at this
point.
4. HP Technical Support will ask for a CZ authorization number and the five (5) digit number
(from step 2).
5. HP Technical Support will provide a validation key to the HP Authorized Service Provider.
6. Enter the validation key.  This will reset the electronic serial number with a temporary
number.
7. Follow the above steps in Programming the Electronic Serial Number to enter the correct
serial number.
Note, updating the BIOS on the OmniBook will not affect the electronic serial number. 
						

							71Required Equipment
· Torx #6 screwdriver
· 5mm hexdriver (F1171 & F1175 only)
Removal Procedure
1. Follow the Display Removal Procedure to gain access to the Logic PCA.
2. For convenience, the Microphone Assembly may be removed at this point.  See Figure 40.
3. The Eject Button and Spring along with the Pivot Door and Spring do not need to be
removed to replace the Logic PCA.  However, both of these springs are easily dislodged at
this point and can become lost.  It is best to remove them and set them aside.Figure 40 - Logic PCA RemovalMicrophone
Assembly
(p/n F1067-60012) Paw Eject Button
(p/n F1170-40005) Paw Eject Arm(p/n F1170-40008)Standoffs
(p/n 0380-4606
F1171 - F1175
only)Logic PCA
(p/n F1170-60906
F1171 - F1175)
(p/n F1360-60906
F1360 only)
Bottom Case
(p/n F1170-
60904
F1171 & F1175)
(p/n F1360-60904Speaker
Connection
Paw Active
Flex Cable
Connection 
						

							724. Remove the Paw Eject Arm, Paw Eject Button, two standoffs (F1171 - F1175 only, the CPU
must be removed to gain access to the two standoffs), and disconnect the Paw Active Flex
Cable and the Speaker Cable.
5. Remove the Logic PCA from the bottom case by first lifting up on the right-hand side .  Note
– the Logic PCA fits snugly into the bottom case.  Removing it will require a little
force; take care not to damage the I/O port connectors by lifting up on them.
Replacement Procedure
1. To replace the Logic PCA, reverse the above procedure.  Ensure that the Grommet and
Bushing are in place on the Logic PCA (see
2. Figure 41).
CAUTION:To avoid damage to the OmniBook components, ensure the paw active flex
cable is completely and squarely inserted into the zero insertion force
connector.Figure 41 - Grommet and Bushing PlacementLogic PCA(top view)Bushing(p/n F1170-40025)Grommet
(p/n F1360-40004)