[QuadList] VR-1200 Capstan Oscillator Mod for Course and Fine Adjustment Pots

[Ted Langdell]

Hi, Chris,

Interesting that Gary Adams was talking about the capstan speed and  
editing at breakfast yesterday.

Does the modification you listed here change or disable any 625-line  
functions?

Ted

On Aug 23, 2009, at 7:59 AM, Chill315 at aol.com wrote:

> VR-1200 B Series Inter-Sync 60 Hz Capstan Oscillator Modification
>
>
> This was given to me by someone a long time ago.  It made life  
> simpler.
>
> The capstan Oscillator is difficult to set and is critical for  
> assemble edits.  It sets the free run speed for the capstan.  There  
> is a simple modification that will provide the user with a course  
> and fine adjustment pot for the oscillator.
>
> Remove Board 13 from the Inter-Sync.
>
> Find R-78, the 625 Capstan Frequency adjustment.
>
> Lift the wire that connects the end of the pot to Q-12 Collector.   
> This is the end not connected to R-60, a 300K resistor.
>
> Attach wire disconnected to the End of R-20 that is not connected  
> to R-38, a 20K resistor.
>
> Reinstall board
>
>
> TEST and Setup
>
> Center R-78
>
> Adjust Capstan Oscillator using R-20.
>
> From now on only use R-78 for Capstan Frequency Adjustment unless  
> pot is near the end of range.  Then re-center and set Oscillator  
> with R-20.
>
> R-20 is now the COURSE adjustment and R-78 is the FINE adjustment.
>
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Ted Langdell
Secretary

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