K2: AF and RF volume controls

[Sverre Holm-2]

> second, if the RF gain control is turned or touched at all, the rig
> immediately goes silent and all the bars in the bar-graph meter are
> illuminated.  Over a period of about three seconds the bars are
> extinguished, from right to left, and the sound comes back up.  The
control
> itself works in limiting RF gain normally, depending on the position to
> which it is turned.

Mine was like that a long while ago also. If I pressed it inwards while
slightly rotating it, it was OK. I remember reading in the archives that it
probably needed replacement, but thought that I had nothing to lose by
spraying it with contact spray.  The spray solved the problem and has done
so for probably a couple of years and at least 1500 QSOs. If you want to try
this then the front panel needs to be removed to access the pot.


73

Sverre
LA3ZA
http://www.qslnet.de/la3za/ 

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[Ron D'Eau Claire-2]

Another, probably less messy, approach is a few drops of DeOxit into the pot
either along the shaft (that's the usual ingress) or, if there's any gaps
around the electrical contacts or case in back, in there. DeOxit comes in a
small squeeze bottle with a very fine metal tube applicator.

I know that good cleaners are supposed to be benign, but it offends my
sensibilities to blast a part with a fluid, Hi! When all I have is a spray I
usually spray a small screwdriver shaft (with a paper towel behind it to
absorb the over-spray) and then let the liquid drip off of the end of the
screwdriver into the part I want 'treated'. That way the paper towel gets
the excess instead of the circuit board.

Ron AC7AC


-----Original Message-----

> second, if the RF gain control is turned or touched at all, the rig
> immediately goes silent and all the bars in the bar-graph meter are
> illuminated.  Over a period of about three seconds the bars are
> extinguished, from right to left, and the sound comes back up.  The
control
> itself works in limiting RF gain normally, depending on the position
> to which it is turned.

Mine was like that a long while ago also. If I pressed it inwards while
slightly rotating it, it was OK. I remember reading in the archives that it
probably needed replacement, but thought that I had nothing to lose by
spraying it with contact spray.  The spray solved the problem and has done
so for probably a couple of years and at least 1500 QSOs. If you want to try
this then the front panel needs to be removed to access the pot.


73

Sverre
LA3ZA
http://www.qslnet.de/la3za/ 

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[Gary Hembree]

Ron D'Eau Claire wrote at Mon, 8 Jan 2007 14:33:23 -0800
"Another, probably less messy, approach is a few drops of DeOxit into the pot
either along the shaft (that's the usual ingress) or, if there's any gaps
around the electrical contacts or case in back, in there. DeOxit comes in a
small squeeze bottle with a very fine metal tube applicator."
__________________________________________

DeoxIT® is the wrong chemical to use on carbon/plastic sliding contact
controls!  It may ruin the film resistor and/or its subtrate.  The proper
cleaner/lubricant is DeoxIT® FaderLube, which was sold as CaiLube MCL.
I've been using the latter product professionally for more than ten years
with excellent results.  See the following on the Caig web site for more
detailed information:

http://store.caig.com/s.nl/sc.2/category.293/.f

I've also used DeoxIT® and DeoxIT® GOLD on rotary switch and relay contacts
with good results over the same time period, both professionally and in my
amateur radio equipment.

Usual caveat: I have no connection with Caig other than as a satisfied
customer.

73
Gary, N7IR


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