Acer Extensa 500 Service Guide

Chapter 371
2.  Remove the modem phone jack shield from the system board. 
9. Remove the system board from the lower case.
Removing the PCMCIA slot 
1.  Remove the 4 screws around the PCMCIA slot. 
2.  Turn the board over, gently lift up the PCMCIA slot.  

72
Machine Disassembly 
Removing the Modem Phone Jack
1.  Remove the modem phone jack from the lower case.
2.  This completes the disassembly of the lower case.  

Chapter 473
Use the following procedure as a guide for computer problems.
Note: 
The diagnostic tests are intended to test only Acer products. Non-
Acer products, prototype cards, or modified options can give false 
errors and invalid system responses.
1.  Obtain the failing symptoms in as much detail as possible.
2.  Verify the symptoms by attempting to re-create the failure by running the 
diagnostic test or by repeating the same operation.
3.  Use the following table with the verified symptom to...

74
Troubleshooting 
System Check Procedures
Diskette Drive Check
Do the following to isolate the problem to a controller, driver, or diskette. A 
write-enabled, diagnostic diskette is required.
Note: 
Make sure that the diskette does not have more than one label 
attached to it. Multiple labels can cause damage to the drive or 
cause the drive to fail. 
Do the following to select the test device. See “Running the Diagnostics” for 
details.
1.  Boot from the diagnostics diskette and start the PQA program...

Chapter 475
2.  Replace the CD-ROM drive.
3.  Replace the system board.
Keyboard or Auxiliary Input Device Check
Remove the external keyboard if the internal keyboard is to be tested.
If the internal keyboard does not work or an unexpected character appears, 
make sure that the flexible cable extending from the keyboard is correctly 
seated in the connector on the system board.
If the keyboard cable connection is correct, run the Keyboard Test. See 
“Running the Diagnostics” for details.
If the tests...

76
Troubleshooting 
2.  Connect the power adapter and check that power is supplied.
3.  Disconnect the power adapter and install the charged battery pack; then 
check that power is supplied by the battery pack.
If you suspect a power problem, see the appropriate power supply check in 
the following list:
q“Check the Power Adapter” on page 76
q“Check the Battery Pack” on page 76
Check the Power Adapter
Unplug the power adapter cable from the computer and measure the output 
voltage at the plug of the...

Chapter 477
2.  Remove the battery pack and measure the voltage between battery 
terminals 2(+) and 7(ground). See the following figure
3.  If the voltage is still less than 8.0 Vdc after recharging, replace the battery. 
To check the battery charge operation, use a discharged battery pack or a 
battery pack that has less than 50% of the total power remaining when 
installed in the computer. 
If the battery status indicator does not light up, remove the battery pack and 
let it return to room...

78
Troubleshooting 
Error Symptom-to-FRU Index
The symptom-to-FRU index lists the symptoms and errors and their possible 
causes. The most likely cause is listed first.
Note: 
 Perform the FRU replacement or actions in the sequence shown 
in FRU/Action column, if the FRU replacement does not solve the 
problem, put the original part back in the computer. Do not replace 
a non-defective FRU.
This index can also help you determine the next possible FRU to be replaced 
when servicing a computer.
If the...

Chapter 479
Extended RAM Failed at 
offset:nnnnDIMM
System board
System battery is dead - 
Replace and run SetupReplace RTC battery and Run BIOS Setup Utility 
to reconfigure system time, then reboot system.
System CMOS checksum 
bad - Default configuration 
usedRTC battery
Run BIOS Setup Utility to reconfigure system 
time, then reboot system.
System timer error RTC battery
Run BIOS Setup Utility to reconfigure system 
time, then reboot system.
System board
Real time clock error RTC battery
Run BIOS...

80
Troubleshooting 
Fail-Safe Timer NMI Failed DIMM
CPU board
System board
Device Address Conflict Run “Load Default Settings” in BIOS Setup Utility.
RTC battery
System board
Allocation Error for: device Run “Load Default Settings” in BIOS Setup Utility.
RTC battery
System board
Failing Bits: nnnn DIMM
BIOS ROM
System board
Fixed Disk n None
Invalid System 
Configuration DataBIOS ROM
System board
I/O device IRQ conflict Run “Load Default Settings” in BIOS Setup Utility.
RTC battery
System board
Operating...