Acer Extensa 450 Maintenance Manual

Figure 6-5  Touchpad Removal/Replacement
 
6-12    Field Service 

6.5.12  Removing/Replacing the SIR Board
To remove and replace the SIR Board, perform the following procedure:
1. Remove the Top Case Assembly as described in paragraph 6.5.10.
2. Unplug the SIR Board cable connector from the Main Board (small leftmost cable
connector at J8 as shown in Figure 6-6).
3. Remove the SIR Board from the notebook.
4Replacement is essentially the reverse of steps 1 through 3 above.
Figure 6-6  SIR Board Removal/Replacement
 
 Field Service   6-13   

6.5.13  Removing/Replacing the Primary Battery
Board
To remove and replace the Primary Battery Board, perform the following procedure:
1. Remove the Top Case Assembly as described in paragraph 6.5.10. 
2. Disconnect the cable located next to the HDD Connector.
3. Remove the two screws that secure the board to the plastics and remove the
board.
4. Replacement is essentially the reverse of steps 1 through 3 above. 
nNote:
 When reinstalling the Primary Battery Board, use the battery pack as a guide
to...

6.5.14  Removing/Replacing the Power Supply
Board Assembly
To remove and replace the Power Supply Board Assembly, perform the following
procedure:
1. Remove the Top Case Assembly as described in paragraph 6.5.10. 
2. Remove the metal shield that covers the Power Supply Board.
3. Using a plastic stick, lift up on the end of the board that is adjacent to the
processor. The board assembly snaps out. Remove board from unit.
4. Replacement is essentially the reverse of steps 1 through 3 above. 
6.5.15...

2.  Remove the Top Case Assembly as described in Paragraph 6.5.10.
3.  Using a plastic stick, lift up on the left and right edges of the board. The board
assembly snaps out. Lift the board out of the unit.
4.  Reassembly is the reverse of steps 1 through 3 above.
6.5.16  Removing/Replacing the Main Board
To remove and replace the Main Board Assembly, perform the following procedure:
1.  Remove the AC Adapter, Battery Pack, Hard Disk Drive and Floppy Disk Drive
from the unit. 
2.  Remove the keyboard...

Phillips-head screws as they are part of the PCMCIA connector
hardware.
9.  Using a 5 mm hex driver, remove the hex nut adjacent to the display cable
connectors.
10.  Lift up along the front edge of the Main Board Assembly until it clears the hard
drive cavity; then pull the board forward and out of the plastics.
11.Remove the secondary Battery and transfer to the replacement Main Board
(reference Paragraph 6.5.17).
12 Reassembly is essentially the reverse of steps 1 through 10 above.
6.5.17...

1.  Remove the Main Board Assembly as described in paragraph 6.5.16.
2.  Carefully slide the secondary Battery Board Assembly from its right angle
connector and remove board from unit.
3. 
Replacement is the reverse of steps 1 and 2 above.
Figure 6-11  Secondary Battery Board
 
6-18    Field Service 

Appendix A
Self-Test Error Messages 
A.1  Introduction
This appendix contains reference data useful in diagnosing and correcting self test
errors.
Table A-1  Self-Test Error Messages
Error Message  Corrective Action
CMOS Battery Bad Replace Main Board
CMOS Checksum Error Cycle power to Notebook; if
problem persists
Disk Boot Failure Insert a system disk in drive A
Diskette Drive Controller Error or No
Controller PresentCycle power to Notebook; if
problem persists
Diskette Drive Error Insert Diskette and...

Error Message  Corrective Action
Keyboard Interface Error Cycle Power to Notebook. If
problem persists
Memory Size Mismatch Enter and then exit the System
Configuration Setup in the Setup
utility.
Missing operating system Correct the HDD type and reboot.
Refer to the specification label
pasted on the back side of the
notebook or attached to hard disk
drive.
Non-system disk or disk error. Replace
and strike any key when readyInsert a system disk in drive A and
press any key
Pointing Device Error Cycle...

Checkpoint
No.Description
D4h   Normal POST start
06h   DMA page register write/read test in-progress or
fail
08h   RAM refresh verification in-progress or failure
09h   1st 64K RAM test in-progress
0Ah   1st 64K RAM chip or data line failure - multi-bit
0Bh   1st 64K RAM odd/even logic failure
0Ch   1st 64K RAM address line failure
0Dh   1st 64K RAM parity test in_progress or failure
10h   1st 64K RAM chip or data line failure bit 0
20h   Slave DMA register test in-progress or failure
21h   Master DMA...