Friday, April 28, 2023

Graetz Joker-834 portable radio repair
What a challenge!

 This radio is as old as me: born in 1959.

Initial conditions

Found it in very tough conditions: dirty, smelly, not working (dead).
Inside the PCB was dirty and strangely greasy in some area.
I have found the schematic in my personal old paper archive.
Here is the annotated version I used during the repair job (look at the end of the article for a high res pristine version):

Please note this rig uses PNP transistors so GND is positive.