Acer Extensa 450 Maintenance Manual

6.2.2   Protecting the Disk Drives
To protect the disk drives and data, back up the system disk periodically on floppy
diskettes. Periodically use a head-cleaning diskette in the floppy diskette drive to
prolong the life of the drive and to help maintain data integrity.
6.2.3   Handling the Computer Battery Pack
The battery pack furnished with the computer requires reasonable care and
handling to ensure efficient operation and maximum life. Periodically inspect the
battery terminals and the batteries for...

cCaution: All boards, options and peripherals contain components that
are sensitive to static electricity. When handling any of these items, pro-
tect against static electricity by using wrist or ankle grounding straps
and grounded working mats. When moving or storing items, use the anti-
static bags supplied with the items.
6.4  Notebook Field-Replaceable Parts
and Assemblies
All members of the Extensa 450 Series Notebook Computers contain two major
assemblies including the Cover Display Assembly (upper...

Table 6-1  Cover Display Assembly, Field Replaceable Units (FRUs)
FRU Description Reference 
Paragraph 
No.FRU Description Reference 
Paragraph 
No.
Inverter Board, DSSTN
10.46.5.9 LCD Cover, DSSTN
10.4, 4506.5.9
Inverter Board, TFT 9.4 6.5.9 LCD Cover, TFT 9.4,
450T6.5.9
Display Assembly, 10.4
DSSTN 4506.5.8 Bezel, DSSTN 10.4,
4506.5.9
Display Assembly, 9.4
TFT 450T6.5.8 Bezel, DSSTN 10.4,
4556.5.9
Slide Pot Board, DSSTN
10.4 6.5.9 Bezel, TFT 9.4,  450T 6.5.9
Converter Board, TFT
9.46.5.9 Bezel, TFT...

Table 6-2  Base Assembly, Field Replaceable Units (FRUs)
FRU Description Reference
Paragraph
No.FRU Description Reference 
Paragraph 
No 
Main Board Assembly 6.5.16 Touch Pad Assembly 6.5.11
Memory Board Assembly 6.5.15 Heat Sink Assembly 6.5.6
Serial IR Board Assembly 6.5.12 HDD Cable 6.5.4
Primary Battery Board
Assembly6.5.13 FDD Cable 6.5.4
Secondary Battery
Board Assembly6.5.17 HDD Cover Assembly 6.5.4
Power Supply Board
Assembly6.5.14 HDD Holder Assembly 6.5.4
Floppy Drive Assembly  6.5.3 Lower Case...

6.5  Notebook Subassembly Removal
and Replacement Procedures
The following paragraphs contain field service-level removal/replacement
procedures for the Notebook.
cCaution: Prior to removing any of the internal FRUs in the notebook, re-
move the AC Adapter, battery, floppy and hard drives and all external op-
tions installed on the notebook.
6.5.1  Removing/Replacing the Notebook Battery
Pack
The procedure for removing and replacing the battery pack(s) is as follows:  
1. Turn off the computer. 
2....

6.5.2   Removing/Replacing PCMCIA Options
The procedure for removing and replacing the PCMCIA options is as follows:  
1. Turn off  the computer.
2.  Remove the PCMCIA device(s).
3.  To replace the PCMCIA Device, open the cover door and insert the device.
Reinstall any external cabling required for the device. 
6.5.3  Removing/Replacing the Floppy Drive
To remove and replace the Floppy Drive,  perform the following procedure:
1.  Remove the battery as described in Paragraph 6.5.1 above.
2. Turn the...

3. Turn the computer over so that the Hard Drive panel is on your right side (See
Figure 6-3). Press down on the circular bump with your thumb to release the
hard drive cover; remove the cover and lay aside for later reinstallation.
4.  Using finger pressure, slide the metal cover downwards toward the edge of the
notebook; then lift upwards to remove the metal cover.
5. Insert a small blade straight slot screwdriver into the recess in the plastics and
gently lift the frontmost edge of the drive out of...

6.5.7  Removing/Replacing Dual Inline Memory
Modules (DIMMS)
To remove and replace the expansion memory, use the following procedure:
1. Loosen the keyboard assembly (but do not disconnect keyboard cables) as
described in steps 1 through 5 of Paragraph 6.5.5).
2.
        Remove the Heatsink as described in Paragraph 6.5.6.
3. Using the back edge of the keyboard as a hinge, lift the front edge of the keyboard
up and lay it against the LCD assembly.
4. Push the two metal springs away from the board edge...

6.5.8   Removing and Replacing the Cover-Display
Assembly
To remove the cover -display assembly, perform the following procedure:
1.  Remove the keyboard and heatsink as described in paragraphs 6.5.5 and 6.5.6
respectively.
2.   Remove the cable cover below the display by lifting upwards on the front edge of
the cover.
4.   Unplug the video cable that mates with the Main Board.
5.  With the main video cable out of the way, two smaller cables are visible. Unplug
the rightmost cable.
6.  Using a plastic...

8.  Reinstallation of the Inverter Board is the reverse of steps 1 through 7 above.
6.5.10  Opening/Replacing the Top Case Assembly
To remove/replace the Top Case Assembly, perform the following procedure:
1. Remove the Keyboard Assembly and Heat Sink Assembly as described in
Paragraphs 5.5.5 and 5.5.6.
2. Remove the four screws that secure the Top Case Assembly to the base. Note that
the screw at the rear of the opening is shorter than the remaining three
screws.
3. Using a plastic stick, unlock the ZIF...