3-8 420 Series
3.4 System Test
To execute the System Test, select 1 from the DIAGNOSTIC TEST MENU, press Enter and
follow the directions displayed on the screen. Move the highlight bar to the subtest you want
to execute and press Enter.
Subtest 01 ROM checksum
This subtest executes a checksum test of the BIOS ROM on the system board.
Subtest 02 Not used
Subtest 03 Not used
Subtest 04 Fan on/off
This subtest checks fan operation using the on/off command.
The fan cable is securely connected to PJ11 on the system board. When you
execute this subtest, the following message is displayed:
*** Fan ON *** : Press [Enter] key?
When you press Enter, the fan should spin.
*** Fan OFF *** : Press [Enter] key?
When you press Enter, the fan should stop.
Subtest 05 Thermistor check
This subtest reads the thermistor connect check status of the power supply
microprocessor, then compares it with the original data. If the data indicates
the connector is open or shorted, it displays an error message.
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