Acer Travelmate 720 Service Guide

Chapter 4 83
Diskette Drive Checkout
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 (please 
refer to “Running...

84 Troubleshooting
Keyboard or Auxiliary Input Device Checkout
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 sub card.
If the keyboard cable connection is correct, run the Keyboard Test. See 
“Running the Diagnostics” for details.
If the tests detect a keyboard problem, do the following one at a time...

Chapter 4 85
Memory Checkout
DIMM cards are available for increasing memory capacity.
Memory errors might stop system operations, show error messages on the 
screen, or hang the system.
1.  Boot from the diagnostics diskette and start the PQA program (please 
refer to “Running PQA Diagnostics Program”).
2.  Go to the diagnostic Memory in the test items.
3.  Press F2 in the test items.
4.  Follow the instructions in the message window.
Note: 
Make sure that the DIMM is fully installed into the connector....

86 Troubleshooting
Flash Memory Update:
The flash memory update is required for the following conditions:
TNew versions of system programs
TNew features or options
Power System Checkout
To verify the symptom of the problem, power on the computer using each of 
the following power sources:
1.  Remove the battery pack and diskette drive.
2.  Connect the AC Adapter and check that power is supplied.
3.  Disconnect the AC Adapter and install the charged battery pack; then 
check that power is supplied by the...

Chapter 4 87
Checking Operational Charging: 
To check operational charging, use a discharged battery pack or a battery 
pack that has less than 50% of the total power remaining when installed in 
the computer.
Perform operational charging. If the battery status indicator does not turn on, 
remove the battery pack and let it return to room temperature. Reinstall the 
battery pack.
If the charge indicator still does not turn on, replace the battery pack. If the 
charge indicator still does not turn on,...

88 Troubleshooting
TouchPad Checkout
If the TouchPad does not work, check the configuration in the BIOS program. 
If the configuration of the TouchPad is disabled, select Enable to enable it.
If this does not correct the TouchPad problem, continue with the following. 
After you use the TouchPad, the pointer drifts on the screen for a short time. 
This self-acting pointer movement can occur when a slight, steady pressure 
is applied to the TouchPad pointer. This symptom is not a hardware problem. 
No...

Chapter 4 89
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 the “FRU/Action” columns. If a FRU replacement did not solve 
the problem, put the original part back in the computer. Do not 
replace a nondefective FRU.
This index can also help you determine the next possible FRU to be replaced 
when servicing a computer.
Numeric error codes...

90 Troubleshooting
0220
Monitor type does not 
match CMOS - Run SetupRun “Load Setup Defaults” in BIOS Setup Utility.
0230
Shadow RAM Failed at 
offset: nnnn1. BIOS ROM
2. System board
0231
System RAM Failed at 
offset: nnnn1. DIMM
2. System board
0232
Extended RAM Failed at 
offset:nnnn1. DIMM
2. System board
0250
System battery is dead - 
Replace and run SetupReplace backup battery (RTC) and Run SETUP 
to reconfigure System time, then reboot system.
0251
System CMOS checksum 
bad - Default...

Chapter 4 91
02D0
System cache error - Cache 
disabled1. IMM (CPU board)
2. System board
02F0
CPU ID:1. IMM (CPU board)
2. System board
02F5
DMA Test Failed1. DIMM
2. IMM (CPU board)
3. System board
02F6
Software NMI Failed1. DIMM
2. IMM (CPU board)
3. System board
02F7
Fail-Safe Timer NMI Failed1. DIMM
2. IMM (CPU board)
3. System board
Device Address Conflict 1. Run “Load Setup Defaults” in BIOS Setup 
     Utility.
2. Backup battery (RTC)
3. System board
Allocation Error for: device 1. Run “Load Setup...

92 Troubleshooting
Power-on indicator on, and 
a blank LCD not POST1. Ensure every connection is correct.
2. DIMM
3. Reseat IMM (CPU board)
4. IMM (CPU board)
5. System board
Power-on indicator not on, 
and a blank LCD during 
POST1. Reseat LCD connectors.
2. LCD inverter ID
3. LCD FPC cable
4. LCD inverter
5. LCD
6. LED board
7. System board
Power-on indicator on, and 
a blank LCD during POST.1. Reseat the LCD connectors.
2. LCD inverter ID
3. LCD FPC Cable
4. LCD inverter
5. LCD
6. System board
•  LCD...