I have a Sony TA F555 ES amp I'm trying to diagnose to either repair myself or determine whether it would be worth bringing to a repair shop.
There are four 2SC2922 NPN power transistors attached to the large heat sink on the back of the unit. All 4 are smoking, some have burned through the center of the chip.
Any ideas of why the chips are failing? I presume there is another problem that needs repair before these power transistors are replaced.
There are four 2SC2922 NPN power transistors attached to the large heat sink on the back of the unit. All 4 are smoking, some have burned through the center of the chip.
Any ideas of why the chips are failing? I presume there is another problem that needs repair before these power transistors are replaced.