Toshiba Tecra 750dvd Maintenance Manual

							4/00, Tecra Toshiba TRRPage 22Tecra 750 Series Disassembly Overview, (cont.)
To remove the fan, follow the steps below.
1.Turn off the power to the computer.
Disconnect the AC adapter and all
external cables connected to the
computer.
2.Remove the battery pack, HDD pack,
optional memory module, modem
board, backup and RTC batteries,
keyboard, membrane switch, top cover
with display assembly, and system
board.
3.Turn the system board upside down
and remove the tape securing the fan
cable.
4.Disconnect the fan cable from PJ550
on the system board.
5.Turn the system board right side up and
remove two M2.5x4 screws.
6.Lift out the fan.
To remove the middle frame, follow the steps
below.
1.Turn off the power to the computer.
Disconnect the AC adapter and all
external cables connected to the
computer.
2.Remove the battery pack, HDD pack,
optional memory module, modem
board, backup and RTC batteries,
keyboard, membrane switch, top cover
with display assembly, and system
board.
3.Remove two M2.5x4 screws and one
M2.5x8 screw securing the Selectable
Bay top cover to the middle frame.
4.Two positioning pins fit into holes on
the Selectable Bay top cover. Pry the
cover free of the pins then lift off the
cover.
5.Disconnect two secondary battery
cables from the I/O board.
6.Remove six M2.5x8 screws and one
M2.5x4 screw securing the middle
frame to the bottom cover.
7.Pull out the Selectable Bay release
lever and set the Selectable Bay lock
to the lock position.
CAUTION: If you remove the middle frame
while the Selectable Bay lock is unlocked, the
I/O board will be damaged.
NOTE: Make sure the screw in the memory
slot has been removed.
8.Lift off the PC card slot cover and lift
out the middle frame.
9.Remove one M2x3 screw securing the
bracket over the probe pin harness.
10.Remove two M2x5 screws securing the
probe pin harness to the middle frame.
11.Lift out the probe pin harness and note
how the cables are threaded.ê 
						

							Toshiba TRR4/00, Tecra
Page 23Tecra 750 Series Disassembly Overview, (cont.)
To install the middle frame, follow the steps
below.
1.Reroute the cables and replace the
probe pin harness.
2.Secure the probe pin harness to the
middle frame with two M2x5 screws.
3.Secure the bracket over the probe pin
harness with one M2x3 screw.
4.Make sure the Selectable Bay release
lever is extended and the Selectable
Bay lock is in the lock position.
5.Seat the middle frame and make sure a
small tongue on the middle frame’s
Selectable Bay locking mechanism fits
into a corresponding notch on the
external Selectable Bay lock.
6.Secure one M2.5x8 screw next to the
Selectable Bay lock arm, then secure
the other five M2.5x8 screws.
7.Secure the middle frame to the bottom
cover with one M2.5x4 screw.
8.Seat the PC card slot cover.
9.Secure the Selectable Bay top cover
with two M2.5x4 screws and one
M2.5x8 screw.
10.Connect two secondary battery cables
to the I/O board.
11.Install the battery pack, HDD pack,
optional memory module, modem
board, backup and RTC batteries,
keyboard, membrane switch, top cover
with display assembly, and system
board.
5.Lift out the I/O board.
6.Lift out the base shield assembly. 4.Remove one M2x6 screw securing the
I/O board to the bottom cover. To remove the I/O board, follow the steps below.
1.Turn off the power to the computer.
Disconnect the AC adapter and all
external cables connected to the
computer.
2.Remove the battery pack, HDD pack,
optional memory module, modem
board, backup and RTC batteries,
keyboard, membrane switch, top cover
with display assembly, system board,
and middle frame.
3.Remove the battery pack jumper as
follows:
(a)From the bottom of the battery
pack slot, push up on the
battery jumper contact and
slide it forward.
(b)Press down on the jumper as
shown in the Figure below and
slide the jumper out to remove
it.î 
						

							4/00, Tecra Toshiba TRRPage 24Tecra 750 Series Disassembly Overview, (cont.)
To remove the display mask, follow the steps
below.
1.Turn off the power to the computer.
Disconnect the AC adapter and all
external cables connected to the
computer.
2.Remove the battery pack.
3.Remove two rubber seals at the
bottom corners of the display
assembly.
4.Remove two M2.5x6 screws that were
covered by the rubber seals.
NOTE: Support the display with your hand
when you remove the screws.
5.Release 18 latches along the edges of
the display mask. Begin at the top (six
latches), continue along the sides (four
latches on each side) and the bottom
(four latches).
6.Remove the display mask.î
To remove the FL inverter board, follow the
steps below.
1.Turn off the power to the computer.
Disconnect the AC adapter and all
external cables connected to the
computer.
2.Remove the battery pack, and the
display mask.
3.Lay the display panel on its back and
remove one M2x4 screw securing the
microphone and its ground cable.
4.Remove two M2.5x6 screws securing
the FL inverter board and its ground
cable.
5.Rotate out the top end of the FL
inverter board and disconnect the FL
cable from CN2.
6.Disconnect the FL inverter cable from
CN1 and lift out the FL inverter board.î 
						

							Toshiba TRR4/00, Tecra
Page 25Tecra 750 Series Disassembly Overview, (cont.)
NOTE: Be careful not to apply pressure to
the ICs along the edge of the LCD module.
The ICs are easily damaged.
To remove the LCD module, follow the steps
below.
1.Turn off the power to the computer.
Disconnect the AC adapter and all
external cables connected to the
computer.
2.Remove the battery pack, display mask,
and FL inverter board.
3.Remove four M2.5x8 screws securing
the LCD module to the display assem-
bly.
4.Carefully rotate out the top of the LCD
module enough to access the display
cable, remove the tape, and disconnect
the cable.
5.Lift out the LCD Module.
CAUTION:  The FL cable, FL inverter cable,
and microphone cable will only fit one way.
Be certain you note how the cables are
routed so they can be replaced accurately.
To remove the microphone, follow the steps
below.
1.Turn off the power to the computer.
Disconnect the AC adapter and all
external cables connected to the
computer.
2.Remove the battery pack, display mask,
FL inverter board, and LCD module.
3.Lift the microphone holder out of its
seat. Remove the microphone from the
microphone holder.
4.Lay the top cover and display assembly
down so that the bottom of the top cover
lies flat and faces up.
5.Remove one M2x4 screw, under the
cable, securing the hinge cover and
one M2.5x6 screw securing the plastic
cable guide.
6.Remove the tape and release the
plastic cable guide, covering the  FL
inverter insulator, microphone cable,
and Fl inverter cable, from the top cover
at the top right corner of the left speaker
cable groove.
7.Press on the small end of the cable
guide, toward the case, to free it.
8.Lift the cable guide straight up, pull the
microphone cable out of the cable
guide, and remove the microphone.
NOTE: Grasp the top cover by the sides when
you rotate it up. Do not pull at the center.ê 
						

							4/00, Tecra Toshiba TRRPage 26Tecra 750 Series Disassembly Overview, (cont.)
CAUTION:  When you remove the FL, be
careful not to let any dust or other foreign
matter contaminate the LCD panel. Any
contamination can affect the performance of
the unit.
To remove the FL, follow the steps below.
1.Turn off the power to the computer.
Disconnect the AC adapter and all
external cables connected to the
computer.
2.Remove the battery pack, display mask,
FL inverter board, LCD module, and
microphone.
3.Remove the tape covering the FL
cable.
4.Remove one thin-head silver screw
and two M2x4 silver screws securing
the metal FL cover.
5.Carefully slide the metal FL cover
about 2 mm away from the FL cables
and lift it up.
6.Lift out the FL cable and the FL.î
í
CAUTION:  When you remove the FL, be
careful not to let any dust or other foreign
matter contaminate the LCD panel. Any
contamination can affect the performance of
the unit.
To remove the FL, follow the steps below.
1.Turn off the power to the computer.
Disconnect the AC adapter and all
external cables connected to the
computer.
2.Remove the battery pack, display mask,
FL inverter board, LCD module, and
microphone.
3.Remove two strips of tape securing
the FL cable and metal FL cover.
4.Remove two thin-head screws
securing the metal FL cover.
5.Slide the metal FL cover forward about
2 mm and lift it off.
6.Lift out the FL cable and the FL holder.
7.Remove the FL tube from the FL
holder.í
è 
						

							Toshiba TRR4/00, Tecra
Page 27Tecra 750 Series Disassembly Overview, (cont.)
CAUTION:  When you remove the FL, be
careful not to let any dust or other foreign
matter contaminate the LCD panel. Any
contamination can affect the performance of
the unit.
To remove the FL, follow the steps below.
1.Turn off the power to the computer.
Disconnect the AC adapter and all
external cables connected to the
computer.
2.Remove the battery pack, display mask,
FL inverter board, LCD module, and
microphone.
3.Remove one strip of tape securing the
FL cable to the LCD frame and lift the FL
cable.
4.Remove two M2x4 thin-head silver
screws, one M2x1 thin-head black
screw, and four thin-head silver
screws.
5.Carefully peel up the insulator adhered
to the circuit boards and ICs.
6.Disconnect the flexible cable from the
larger board and press down the
connector flap to avoid damage.
7.Lift up the center of the metal FL cover
until two latches are released.
8.Insert a thin object such as the end of
tweezers under the metal FL cover until
the cover is freed.
9.Lift up on the metal projections and pull
the FL cover slightly forward, slide it left,
and lift it out.
10.Carefully lift up the white sheet covering
the FL.
11.Lift out the pink FL cable connector.
12.Lift the white FL cable out of its groove
to remove the FL with cables.î ê
í
Images continued on the next pageî 
						

							4/00, Tecra Toshiba TRRPage 28Tecra 750 Series Disassembly Overview, (cont.)ê
Removing the FL, continued.