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

[Bruce MacLellan]

Ken,
 I had the same problem with an "A" , but on all frequencies.   It turned out to be a resistor at the PTO tube socket that had broken into 2 pieces and made contact untill it warmed up a bit.   Sorry but I don't have my schematic or notes with me to identify it.   
Bruce


-----Original Message-----
>From: Ken Harpur <igloo99nz at yahoo.co.nz>
>Sent: Mar 23, 2011 12:07 AM
>To: r-390 at mailman.qth.net
>Subject: Re: [R-390] Update to 3 Mc issue with R390A
>
>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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