Toshiba Satellite M40 Maintenance Manual page 109

3.5 System Test
2. Chipset Fan Speed Test
This test item is to check whether Chipset Fan exists or not. If it exists, the
test will check the speed of Chipset Fan at the status of Power On or Power
Off.
Manual 35
Satellite M40/M45 TECRA A4 Dynabook Vx/4 Maintenance
3 Diagnostic Programs