Resurrected a Customized WOPL 400

Aw jeez Scott, I've got a 700 board in front of me here.


W want to check offset, one test lead on "out" and one on ground , whacha got, and what on rail voltage?
 
laatsch55 said:
Aw jeez Scott, I've got a 700 board in front of me here.


W want to check offset, one test lead on "out" and one on ground , whacha got, and what on rail voltage?
Click to expand...

Ground to OUT2: Left: 66.9vdc. Right: 12.95vdc.
 
Yep, need to get those minus pico fuses changed out. What do you have for rail voltage?
 
Nevermind, Rev C..... Check the 1 ohm resistors towards the bottom of the backplane , a couple of them act as small fuses also...
 
This is exactly why I will never attempt one of these builds, I just don't have the patience. The amp would be flying across the yard by now :laughing6:
 
I guess that's my point. Unless I find where the short occurred, it's just going to do the same thing after I replace the parts. Obviously, the whole unit needs to come apart in order to replace pieces on the backplane boards. So how do I diagnose the problem? Any ideas?
 
Let me read through the whole thread again Scott, maybe I can get an idea...
 
Northwinds said:
This is exactly why I will never attempt one of these builds, I just don't have the patience. The amp would be flying across the yard by now :laughing6:
Click to expand...
Well, this is just a fun project. I already have a Phase Linear system in use. This amplifier is for my own entertainment. I love projects, and I'm retired. So even when I start to get pissed, I just remind myself that I'm extremely lucky to have the time and resources to even attempt this build. I don't have any kids, no living relatives, house is paid for, girlfriend is fantastic. If I can get this one going, I have a 700 Series II I recently acquired for $0.00 I'm going to rebuild as well. The 700 is already performing like a champ, so there's no hurry. Also, I have a 3300 pre I want to rebuild. I'm just waiting for parts from Dennis. I've been waiting a long time on the parts, but that's okay. I think Dennis' life is a little nuts now. So I don't mind waiting a bit longer. He's come through a bunch of other times. It'll work out.
 
laatsch55 said:
Let me read through the whole thread again Scott, maybe I can get an idea...
Click to expand...

Clearly this thing has to come apart. Would it be easier for me to simply post close-up photos of each component for verification?
 
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