[R-390] Update to 3 Mc issue with R390A

[Ken Harpur]

Roger,

I find this very interesting...I have an R-390(non-A) that exhibits the same behaviour in the crystal calibrator module...

Turn it on and it's good for about 30seconds or so then indeed dies a slow death. I had initially thought it may have been a cap or resistor that's gone out of spec. The idea of crud getting in there and causing mischief hadn't occured to me.

Ken 


On 23/03/2011, at 12:45 PM, Flowertime01 at wmconnect.com wrote:

> Steve,
> 
> An update on the 3Mc issue, 20Mc is having the same issue.....
> 
> There's your clue. 3 and 20 share a crystal in the 2ND osc deck.
> 
> When you switch into 3 or 20 the shock bumps the crystal, but the gain is 
> to low to keep it going so it dies a slow 30 second death.
> 
> 1 clean the crystal socket and crystal pins in the OSC oven.
> 2 clean the tube socket pins.
> 3 clean the switch contact.
> 4 clean the trimmer cap on the OSC deck.
> 
> Try to clean the tube socket and crystal sockets as you can do that without 
> pulling the RF deck.
> 
> If you do need to pull the RF deck then take the time to do a full clean, 
> polish and lube. Save your self from doing it one band at a time as they fail 
> from crud.
> 
> If that does not fix it then you will need to get a replacement crystal.
> 
> Roger Ruszkowski</HTML>
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