[QuadList] Problem AVR 3--Did this ever get identified/fixed?

[lee williams]

Hi Ted, 
 
Got part of the problem fixed with the low RF. 
 
Turns out that the pre-amp of a NTSC/PAL AVR3 is different than a NTSC only. 
When I got the right amp in the right machine, the RF came back to were it should be. 
 
The interesting thing is now I have lost Auto Chroma on that machine. (And it's not the #4 card) 
The manual says that several of the cards have to work together to get it to auto chroma and unfortunately we did not write down what we had swapped out between machines. 
 
Makes a good picture on manual so not really to enthusiastic to find the right combination. 
 
As for cleaning, I still have 3 gallons left of the old xylene that California banned 10 years ago. 
Toxic as you can believe, but brings back heads like nothing else will. 
 
Lee 
 
 


--- On Wed, 7/13/11, Ted Langdell <ted at quadvideotapegroup.com> wrote:


From: Ted Langdell <ted at quadvideotapegroup.com>
Subject: Re: [QuadList] Problem AVR 3--Did this ever get identified/fixed?
To: "Quad List" <quadlist at quadvideotapegroup.com>
Date: Wednesday, July 13, 2011, 6:03 PM



Hi, Lee,


Just wondering whether you were able to track down the problem and fix it.


Ted




On Apr 6, 2011, at 8:48 AM, lee williams wrote:






Have a interesting problem with one of my AVR 3's. 
 
I have consistently low RF readings at the tracking meeter and can't get the RF up to normal levels. 
 
 
Here is what I see. 
 
A known good hi band tape that will display RF between 80-85 in any other machine will only display 10-15. 
 
Low Band light always on.
 
Auto Chroma won't respond on #4 card. 
 
Looking at the Demod in the wave form monitor, the sync level looks 10 IRE low. 
 
 
Here is what  I have tried.  (all swap outs are with known working machines) 
 
Swapped out pre amp behind head. 
Changed out MDA  (it was bad with other issues) 
Swapped out every card in the lower frames. 
Changed out power supply frame.  (it had cap problems with other issues) 
 
 
This one has me good. 
Nothing visible as far as the wiring harness. 
I am kind of running out of things to swap/look at. 
 
Has anybody else ever experienced this one? 
 
Also, 
Were will the get together be at NAB? 
Plan on being there for Monday and Tuesday. 
 
Thanks 
Lee 
 
 
 
 
 

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Ted Langdell
Secretary


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