Hello,
I trying repair Genelec s30's.
- its a three way active speaker
- bass, mid, treble has its own amp
- treble unit was short circuited, burning transistors
- no short circuit in the cable or ribbon tweeter
- changed many parts and got it running except bias reads ZERO!
- dc offset is within limits and reacts to trimmer
- bias is 0.00v and doesnt react to the trimmer
- bias trimmer pot is tested and ok, resistors attached to bias circuit are ok, capasitor in bias circuit was changed
- transistors were changed and tested too (with cheap component tester)
- attachment has the schematic and some info
Why bias stays zero and where is the fault?
I trying repair Genelec s30's.
- its a three way active speaker
- bass, mid, treble has its own amp
- treble unit was short circuited, burning transistors
- no short circuit in the cable or ribbon tweeter
- changed many parts and got it running except bias reads ZERO!
- dc offset is within limits and reacts to trimmer
- bias is 0.00v and doesnt react to the trimmer
- bias trimmer pot is tested and ok, resistors attached to bias circuit are ok, capasitor in bias circuit was changed
- transistors were changed and tested too (with cheap component tester)
- attachment has the schematic and some info
Why bias stays zero and where is the fault?
