Hope you can view the schematic here or locate it via search.
https://www.scribd.com/mobile/doc/118264526/Toshiba-SC-335-Schematic-Diagram
The right channel has intermittent problem of going dead and blowing 4amp F1. First attempt was to replace fuse and it worked great for several minutes but then suddenly heard buzzing in speaker and then quiet. Fuse had blown again. Also speaker was blown.
Tried again with larger fuse trying to get bad part to fail enough to identify it but so far continues to work just fine.
I did find that R27 10 ohm that looked like it had run hot at some time had increased in value to 160 ohms. I replaced it and not sure how it had run hot with no DC path through C13 that is not shorted.
So my question is what is most likely cause of burned speaker VC and blown fuse that happen at random?
If the input transistors are involved, why wouldn't they short out with the current we must be getting during the failure mode. Or are the drivers, outputs be more likely. I'm considering replacing all the transistors and hope for the best.
Appreciate your thoughts and thanks !
https://www.scribd.com/mobile/doc/118264526/Toshiba-SC-335-Schematic-Diagram
The right channel has intermittent problem of going dead and blowing 4amp F1. First attempt was to replace fuse and it worked great for several minutes but then suddenly heard buzzing in speaker and then quiet. Fuse had blown again. Also speaker was blown.
Tried again with larger fuse trying to get bad part to fail enough to identify it but so far continues to work just fine.
I did find that R27 10 ohm that looked like it had run hot at some time had increased in value to 160 ohms. I replaced it and not sure how it had run hot with no DC path through C13 that is not shorted.
So my question is what is most likely cause of burned speaker VC and blown fuse that happen at random?
If the input transistors are involved, why wouldn't they short out with the current we must be getting during the failure mode. Or are the drivers, outputs be more likely. I'm considering replacing all the transistors and hope for the best.
Appreciate your thoughts and thanks !
