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 ensure that the connector slots properly align with the battery slots.
Figure 6-7  Primary Battery Board Replacement
 
6-14    Field Service 
						

							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  Removing/Replacing the Memory Board
To remove and replace the Memory Board Assembly, perform the following
procedure:
1.  Remove the AC Adapter, Battery Pack, Hard Disk Drive and Floppy Disk Drive
from the unit. 
Figure 6-8  Power Supply Board Removal
 
 Field Service   6-15   
						

							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 assembly as described in Paragraph 6.5.5
3.  Remove the Heatsink as described in paragraph 6.5.6.
4.  Remove the Power Supply Board as described in paragraph 6.5.14.
5.  Remove the Memory Board as described in paragraph 6.5.15.
6 Disconnect all interboard cable connectors (SIR Board Connector from J9;
Primary Battery Board Connector from J15, etc.
7 Using a small flat blade screwdriver and apply light pressure in a rocking
motion to remove the hard drive cable connector.
8 Remove the three large Phillips-head screws (one near the 25-pin parallel port and
two screws near the floppy connector. Do not remove the smaller
Figure 6-9  Memory Board Removal
 
6-16    Field Service 
						

							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  Removing/Replacing the Secondary Battery
Board
To remove and replace the Secondary Battery Assembly, perform the following
procedure:
Figure 6-10  Main Board Removal/Replacement
 
 Field Service   6-17   
						

							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 retry; if
problem persists
Diskette Drive Type Mismatch Press Ctrl-Alt-Esc to reconfigure
the system.
Equipment Configuration Error Press Ctrl-Alt-Esc to reconfigure
the system.
Hard Disk 0 Error Cycle power to Notebook; if
problem persists
Hard Disk 0 Extended Type Error. Cycle power to Notebook; if
problem persists, replace Hard
Drive 
Insert system diskette and press key to
rebootInsert a system disk in drive A
I/O Parity Error Cycle power to Notebook; if
problem persists
Keyboard Error or No Keyboard Con-
nectedCycle power to Notebook; if
problem persists
       
Error  Messages 
A-1 
						

							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 Power to Notebook; if
problem persists
Pointing Device Interface Error.  Cycle Power to Notebook; if
problem persists, open up the
notebook and check the touchpad
cabling
Protected Mode Test Fail Cycle power to Notebook
RAM BIOS Bad Cycle power to Notebook
RAM Parity Error.  Cycle power to Notebook if problem
persists
Real-T ime Clock Error Press Ctrl-Alt-Esc to reconfigure
the system.
Video RAM BIOS Bad Cycle power to Notebook
Table A-2 POST Checkpoint List 
Checkpoint
No.Description
D4h   Normal POST start
FCh   CMOS and BIOS ROM checksum test skip or
complete
01h   80286 register test in-progress
02h   CMOS write/read test in-progress or failure
03h   BIOS ROM checksum in-progress or failure
04h   Programmable Interval Timer test in-progress or
failure
     
A-2 Error  Messages 
						

							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 register test in-progress or failure
22h   Master interrupt mask register test in-progress
or fail
23h   Slave interrupt mask register test in-progress or
fail
25h   Interrupt vector loading in-progress
27h   Keyboard controller test in-progress or failure
28h   CMOS power -fail and checksum checks in-
progress
29h   CMOS config info validation in-progress
2Bh   Screen memory test in-progress or failure
2Ch   Screen initialization in-progress or failure
2Dh   Screen retrace tests in-progress or failure
2Eh   Search for video ROM in-progress
30h   Screen believed operable:
34h   Timer tick interrupt test in_progress or failure
35h   Shutdown test in_progress or failure
36h   Gate A20 failure
37h   Unexpected interrupt in protected mode
38h   RAM test in_progress or failure above address
0FFFFh
       
Error  Messages 
A-3