[QuadList] Problem AVR 3

[Don Norwood]

Hi Lee:

Did you swap the head itself?

An incorrect level out of the demod would be expected if the carrier selection is wrong.

Otherwise, probably time to get out the scope and manuals.

Don Norwood
Digitrak Communications, Inc.
www.digitrakcom.com
  ----- Original Message ----- 
  From: lee williams 
  To: Quad List 
  Sent: Wednesday, April 06, 2011 11:48 AM
  Subject: [QuadList] Problem AVR 3


        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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