Hi I have a problem on a channel of this amp when I switch it on you hear a noise like fries accompanied by a slight hiss, which does not bother to play, but raising the maximum volume that the sound always almost tears while 'other channel has no problems playing the whole, I was advised to move the ceramic plates and acting on bias but nothing 's gonna change, I have no diagrams or other in order to understand what the problem is, anyone can' help me in this?
Thanks to all
Thanks to all
Look at the attached image (link). You see two resistors. Place the meter (set to ohms) on the end points of each resistor. What is the resistance for each?
Do this with no power applied.
http://www.bcae1.com/temp/ppidriverboardresistoroverlay01.swf
Do this with no power applied.
http://www.bcae1.com/temp/ppidriverboardresistoroverlay01.swf
If the problem is noise, you need to be able to either listen to the signal at various points in the signal chain or you need to be able to see the waveforms to see where the noise is being introduced.
Are you sure that the noise isn't due to dirty contacts or bad connections on the switches, potentiometers or RCA jacks?
Are you sure that the noise isn't due to dirty contacts or bad connections on the switches, potentiometers or RCA jacks?
hi Perry i have solved this, i have reweld the pins to channel card/board ( your photo see a few weldind pins and maybe not make a good contact)and transistor and for now noise is vanished, now i test for 2-3 day, i hope is all ok .
tnx 4 u help, maybe one day i disturb you again for oscilloscope signal , first i buy a oscilloscope
.
tnx again
tnx 4 u help, maybe one day i disturb you again for oscilloscope signal , first i buy a oscilloscope
.tnx again
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