AKAI PDP4273M Help Needed

[capkid]

Re: AKAI PDP4273M Help Needed

What puzzles me is I get three green lights on the control broad. You would think if it had a problem I would not get the 3 green.

Yeah, that is a little odd. I'd still take the cheap gamble instead of trashing it right away.

Edit: I'd also look at the ribbon cable as a possible failure.

[capkid]

Re: AKAI PDP4273M Help Needed

One other thing: Check your Vzb voltage on the Z-Sus to make sure it's correct. It should be somewhere around 100V (see the panel label). To check the Vzb (Zbias), place your negative lead on the chassis and your positive lead on collector of the transistor at location Q18.

[n7qpp]

Re: AKAI PDP4273M Help Needed

well purchased a logic broad and still have the same problem. The Vzb is 99.2 volts.

[capkid]

Re: AKAI PDP4273M Help Needed

Ah, that's too bad. I wonder if something upstream from the logic board, such as the main board, is causing the -Vy to drop.

[n7qpp]

Re: AKAI PDP4273M Help Needed

I think it is something on the Y-sus broad. All the voltages coming into the Y-sus are fine. If I just could track down the schematic I could back track and see were the problem is occurring. Someone out there in the great WWW must have one.