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

[Chill315 at aol.com]

Good for you in solving the first problem.
 
One thing you can do to try to get the right set of boards back is see if  
there are serial numbers on the boards.  Sometimes there were.  Look  at the 
serial numbers of the machines and thus you might figure out that the  
lower card serial number will go with the lower serial  number machine.  Another 
way is if there is a big difference between  the serial numbers of the 
machines, the dash numbers on the boards may be  different.  Higher dash number, 
later production.  Also if there is a  different assembly number, then the 
board is not compatible with an earlier  machine.  Usually means there was a 
change to the back plane in that  case.  
 
Lastly, if you set the machine up in manual mode and it does not get it  
perfectly, but close, check the DG controls.  Sometimes they are so far  from 
normal that it looks strange.  This is a real extreme situation and  
probably does not apply.  But I throw it out for consideration.
 
Chris Hill
 
 
In a message dated 7/14/2011 8:15:52 P.M. Eastern Daylight Time,  
lasvegastvengineer at yahoo.com writes:

     
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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