1985 Commodore 128 PSU repair 

Repair of a dead Commodore 128 computer power supply. The supply has 9vac and 5vdc outputs. The 9vac output is direct from the transformer winding via a fuse. The 5vdc output has rectifier and regulation circuitry.
The video shows the schematic and basic operation of the PSU, and hopefully will help you to repair your own.
EDIT:
The schematic IS correct. V7 is the power transistor that was changed (BD708), V6 is a small non-power transistor used for feedback from the input voltage to the power transistor
(There is no silkscreen on the board so nothing was marked!)
---------------------------------------------------------------------------------------
RU-vid: / @antandtec
Instagram: / antandtec
TikTok: / ant_and_tectok

Наука