Toshiba A20-S259 Maintenance Manual - Page 122

3 Tests and Diagnostics 3.4 System Test 3.4 System Test To execute the System Test select 1 from the DIAGNOSTIC TEST MENU, press Enter and follow the directions 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 Thermister Check This subtest reads the status (normal/open/short) of the [Thermister connect check] of the PS micon. When it is not normal, an error message is displayed. When it is normal, the display returns to the main menu. Subtest 04 CPU Fan On/Off This subtest checks CPU fan operation using the on/off command. The following message will appear when this subtest is executed. Make sure the fan does not rotate and press Enter. Test CPU Fan Revolution 0000RPM Start The following message will appear. Make sure the fan rotates at high speed and press Enter. Test CPU Fan Revolution LEVEL 5 speed start Subtest 05 2nd Fan On/Off This subtest checks 2nd fan operation using the on/off command. The following message will appear when this subtest is executed. Make sure the fan does not rotate and press Enter. Test 2nd Fan Revolution 0000RPM Start The following message will appear. Make sure the fan rotates at high speed and press Enter. Test 2nd Fan Revolution LEVEL 5 speed start Subtest 06 Quick charge This subtest checks the status for the quick charge. 3-10 Satellite A20 Maintenance Manual (960-444)