Commodore PET => CBM II => CBM-II tips & tricks => Topic started by: Blacklord on July 30, 2009, 07:13 AM
Title: System runs fine, but a whining noise is heard
Post by: Blacklord on July 30, 2009, 07:13 AM
Only on hi-profile models, the cooling fan mounted on top of the power supply needs cleaning/replacement. Can also be a filter capacitor dying in the power supply unit.