Acer Travelmate 4220 Service Guide

83Chapter 3
3.Connect the wireless antenna to the wireless card.
Reassembling the HDD
1.Place the HDD back to the main unit.
2. Secure the HDD with one screw.
3. Place the HDD cover back to the main unit.
4. Secure the HDD cover with the two screws.
Reassembling the heatsink cover & Battery
1.Aim the three hooks to the holes on the rear panel and place the heatsink cover back to the lower case.
2. Secure the heatsink co ver with six screws. 

Chapter 384
3.Place the battery back.
4. This completes the main unit reassembly. 

85Chapter 3 

Chapter 485
Use the following procedure as a guide for computer problems.
NOTE: The diagnostic tests are intended to test this model.   Non-Acer products, prototype cards, or modified 
options can give false errors  and invalid system responses.
1. Duplicate symptom and obtain the failing symptoms in as much detail as possible.
2. Distinguish symptom. Verify the symptoms by attempti ng to re-create the failure by running the diagnostic 
test or by repeating the same operation.
3. Disassemble and...

86Chapter 4
System Check Procedures
External Diskette Drive Check
If an error occurs with the internal diskette drive, reconnect the diskette connector on the system board.
If the error still remains:
1. Reconnect the external diskette drive/DVD-ROM module.
2. Replace the external diskette drive/CD-ROM module.
3. Replace the main board.
External CD-ROM Drive Check
Do the following to isolate the problem to a controller,  drive, or CD-ROM. Make sure that the CD-ROM does 
not have any label attached to...

Chapter 487
Power System Check
To verify the symptom of the problem, power on the computer using each of the following power sources:
1. Remove the battery pack.
2. Connect the power adapter and check that power is supplied.
3. Disconnect the power adapter and install the charged ba ttery pack; then check that power is supplied by 
the battery pack.
If you suspect a power problem, see the approp riate power supply check in the following list:
T“Check the Battery Pack” on page 88 

88Chapter 4
Check the Battery Pack
To check the battery pack, do the following:
From Software:
1.Check out the Power Management in control Panel
2. In Power Meter, confirm that if the parameters sh own in the screen for Current Power Source and Total 
Battery Power Remaining are correct.
3. Repeat the steps 1 and 2, for both battery and adapter.
4. This helps you identify first the prob lem is on recharging or discharging.
From Hardware:
1. Power off the computer. 
2. Remove the battery pack and measure...

Chapter 489
Power-On Self-Test (POST) Error Message
The POST error message index lists the error message and their possible causes. The most likely cause is 
listed first.
NOTE: Perform the FRU replacement or actions in the s equence shown in FRU/Action column, if the FRU 
replacement does not solve the proble m, 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...

90Chapter 4
Index of Error Messages
Error Message List
Error MessagesFRU/Action in Sequence
Struck Key See “Keyboard or Auxiliary Input Device Check” on page 86
System CMOS checksum bad - Default 
configuration used RTC battery
Run BIOS Setup Utility to reconfigure system, then reboot system.
Real time clock error RTC battery Run BIOS Setup Utility to reconfigure system time, then reboot 
system.
Main board
Previous boot incomplete - Default configuration 
used “Load Default Settings” in BIOS Setup...

Chapter 491
Error Message List
No beep Error MessagesFRU/Action in Sequence
Power-on indicator turns off and LCD is blank. Power s ource (battery pack and power adapter.) See “Power 
System Check” on page 87
Ensure every connector is connected tightly and correctly.
Reconnect the DIMM.
Main board.
Power-on indicator turns on and LCD is blank. Power s ource (battery pack and power adapter.) See “Power 
System Check” on page 87
Reconnect the LCD connector
Hard disk drive
LCD cable
LCD inverter
LCD
Main...