Acer Travelmate 420 Service Guide

							Chapter 253
requirements, your regional office MAY have other diagnostic program. Please contact your regional 
offices or the responsible personnel/channel to provide you with further technical details.
NOTE:  For ASSY Function Test Procedure, please prepare the following items for system components test: 
PC (with FIR port), 1394 HDD, PS2 mouse, PS2  Ext-KB, CRT monitor, USB mouse, CD-ROM, DVD-
ROM disc (with data and audio track), external speak er, internal CD-ROM module, internal DVD-ROM 
module, SD card, MS card, AC adapter (90W), TV.
NOTE:  As running the testing utility, please do use the ri ght AC adapter (90W, 19V/4740mA). If you use AC 
adapter lower than 90W, it will damage notebook computer power circuit material. 
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							54Chapter 2
Running Diagnostics Program
1.RTC Function Test
Run the RTC Function Test program.
2. PIO Loop Back Test
Insert PIO loopback fixture to main boar d PIO connect then run the testing program.
3. CD-ROM Function Test
Insert a data CD to CD-ROM drive. Then check the  CD-ROM drive function with CD-ROM Function Test.
.
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							Chapter 255
4.Touchpad and USB Mouse Test
This utility can test touchpad and USB ports.
The three USB ports locate on the right panel. Please insert a USB mouse to USB port 1, port 2 and port 3. As
you run the testing utility, please test  port 1 and port 2 first. Move the mouse and click the left and the right
button to test its functions. After USB port 1 and port  two have been checked, please insert the mouse to the
third USB port for testing. Move t he mouse and click the right and the left button to see if it works fine.
.
                                   USB Port 1                              USB Port 2                          USB Port 3
5. Video Model (R. G. B.) Test
Use the utility to test LCD  color(red, green, blue, white, black) mode. Please  press “Enter” key to continue
each color display.
.
6.Internal Keyboard Test
 
     
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							56Chapter 2
Run the Internal Keyboard Test. Press the key one by one to see if it functions well or not. If suspect a certain 
key has problem, please press “B” key to test the key again.
7. Num/Caps/Scroll Key Lock Test
Press the FN+Num/Caps key. Then  check if the FN+Num/Caps media LED is emitting or not.
8. Battery (Charge/Discharge) Test
Use Battery Test to check AC adapter function and c harging LED. Please plug in the AC adapter before you 
run the testing utility. If the battery capacity  is more than 95%, it will alway pass the test. 
IMPORTANT: As running the testing utility, please do use th e right AC adapter (90W, 19V/4740mA). If you use 
AC adapter lower than 90W, it will damage not ebook computer power circuit material. 
9. Audio Test
Use this utility to test audio function. Please test inte rnal speakers first. Then insert the external speakers to 
speaker phone jack and see if it functions normally. List en to the sound emitting from the left and the right 
speakers (both internal and external).
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							Chapter 257
10.Audio CD Play Function Test
Put a music compact disc in CD-ROM drive. Click “Play”  button that display on the LCD/or external CRT 
monitor to play the music disc. Then click on other function  keys to test its functions. Click on “QUIT” to exit the 
testing.
11 . Lid Switch Function Test
Please use the utility to test the Lid Switch Functioin.
Close the LCD to press “Lid switch” for testing. Then check if the LCD backlight is on or off.
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							58Chapter 2
12.Easy Button Function Test
Please press the launch keys and audio controls respecti vely to see if they work normally. Launch keys locate 
on the middle cover; audio controls locate on the front panel. Once you press any launch key or audio control, 
the button displaying on the LCD/CRT monitor will disappear at the same time.
NOTE:  Please also note the FIR LED colors. It emits orang e for Wireless mode; green for bluetooth mode. If 
FIR LED does not light up, it m eans there is no wireless function.
13. FA N  Te s t
Run FAN test program to check if fan  wire and fan function works normally.
14. CRT Output Function Test
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							Chapter 259
Run CRT output fucntion test to see if CRT displays well. Please plug in CRT cable to monitor connectorFAN 
test program to check if fan wire and fan function wor ks normally. Press “Fn+F5” to switch to CRT monitor and 
LCD. This utility mainly checks if  you can be switch to LCD and CRT  monitor on this notebook computer.
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							60Chapter 2
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							Chapter 361
This chapter contains step-by-step procedures on how to disassemble the notebook computer for 
maintenance and troubleshooting.
To disassemble the computer, you need the following tools:
TWrist grounding strap and conductive mat for preventing electrostatic discharge
TFlat head screw driver
TTw e e z e r s
TPlastic screw driver
TNut driver
TPhilips screw driver
NOTE: The screws for the different components vary in size.  During the disassembly process, group the 
screws with the corresponding components to avoid mismatch when putting back the components. 
When you remove the stripe cover, please be careful not to scrape the cover.
Chapter 3
Machine Disassembly and Replacement
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							62Chapter 3
General Information
Before You Begin
Before proceeding with the disassembly procedure, make sure that you do the following:
1.Turn off the power to the system and all peripherals.
2.Unplug the AC adapter and all power and signal cables from the system.
3.Remove the battery pack.
NOTE:  TravelMate 420 series product uses mylar or tape to fasten the FFC/FPC/connectors/cable, you may 
need to tear the tape or mylar before you disconnect different FFC/FPC/connectors.
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