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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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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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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
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.
Machine Disassembly and Replacement
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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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