Hello,
I have one of these i am eager to repair, it used to work but was out of range and not creating the desired or 'advertised' frequnecies.
Looking at the manual, it stated that capacitors C1-C12 were resposible for frequency control, so due to their old age and the fact they are wax coated paper capacitors, i assumed they would be leaky...I desoldered them, measured them and they were fine, but upon reattaching them the unit no longer gives a stable output.
In addition to this, there is evidence of burning on the board, around the base of V2 (12BH7 valve), and around R12 and R24.
Here is a schematic, sorry, the pdf is a bit too big to upload here...i can email to people if they wish though
http://pdfcast.org/pdf/af-sig-gen-sche
Can anyone please tell where to test the circuit for fault finding? I am not sure if its oscillating at all anymore
I have access to decent test equipment (DMMs, RLC, Scopes)
Thanks
Duncan
I have one of these i am eager to repair, it used to work but was out of range and not creating the desired or 'advertised' frequnecies.
Looking at the manual, it stated that capacitors C1-C12 were resposible for frequency control, so due to their old age and the fact they are wax coated paper capacitors, i assumed they would be leaky...I desoldered them, measured them and they were fine, but upon reattaching them the unit no longer gives a stable output.
In addition to this, there is evidence of burning on the board, around the base of V2 (12BH7 valve), and around R12 and R24.
Here is a schematic, sorry, the pdf is a bit too big to upload here...i can email to people if they wish though
http://pdfcast.org/pdf/af-sig-gen-sche
Can anyone please tell where to test the circuit for fault finding? I am not sure if its oscillating at all anymore
I have access to decent test equipment (DMMs, RLC, Scopes)
Thanks
Duncan