i just got the PL20 and i put it all together. i don't have the back plane just the PL20. once i got to the bias adjustment the left adjusted fine. Right channel however i get nothing. i get no reading at the test point. i verified all my work to make sure i did not install diode or cap in reveres position and it looks good for both channels. i dont know where to start looking since i do not have the diagram. I measured some voltages and what i know is this:
there is +-81vdc, + -15 vdc. and i get 0.6vdc at the left channel bias pot and 0.1 at the right one.
i have q6 and q9 readings but im not sure which is e b c but i hope this helps:
| o |
/ | \
1 2 3
Q6L: 1=1.4vdc, 2=81.5vdc, 3=0.88vdc
Q6R: 1=-0.64vdc, 2=81.4vdc, 3=0.224 vdc
Q9L: 1=0.62vdc, 2=-80.7vdc, 3=-0.010vdc
Q9R: 1=-0.124vdc, 2=-81.5vdc, 3=-0.012vdc
Q1: 1=15.6vdc, 2=81vdc, 3=15.1vdc
Q2: 2=-16.1vdc, 2=-81vdc, 3=-15.6vdc
not sure i that helps but here it is.
Any ideas where to start looking for the problem. Thank you
there is +-81vdc, + -15 vdc. and i get 0.6vdc at the left channel bias pot and 0.1 at the right one.
i have q6 and q9 readings but im not sure which is e b c but i hope this helps:
| o |
/ | \
1 2 3
Q6L: 1=1.4vdc, 2=81.5vdc, 3=0.88vdc
Q6R: 1=-0.64vdc, 2=81.4vdc, 3=0.224 vdc
Q9L: 1=0.62vdc, 2=-80.7vdc, 3=-0.010vdc
Q9R: 1=-0.124vdc, 2=-81.5vdc, 3=-0.012vdc
Q1: 1=15.6vdc, 2=81vdc, 3=15.1vdc
Q2: 2=-16.1vdc, 2=-81vdc, 3=-15.6vdc
not sure i that helps but here it is.
Any ideas where to start looking for the problem. Thank you
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