[Lowfer] Icom R75 Frequency Jumps

[ToddRoberts2001 at aol.com]

Hi John,
Thanks much for the step by step directions on how to access the
front panel pots in the R75. I will take a look inside to see what the  pots
look like.
 
I have drilled holes in pots before in order to get a shot of Deoxit F5  
fader
lube inside and it was worth the trouble, so I won't let a sealed pot stop  
me.
Also sometimes I have been able to remove the back side of a pot 
in order to get  access inside without drilling so will see how  they are 
put together.
 
The Deoxit F5 has restored older sealed push-button switches in
some vintage Technics audio amplifiers I have after drilling holes in  the 
plastic to get
the spray lube inside the switches. The switches have worked great ever  
since.
 
Sometimes I wonder if sealing a pot or a switch is worthwhile? I have run  
across
many sealed pots in older equipment that have gone scratchy or intermittent 
 so
I don't think it necessarily increases reliability, but it does make it  
harder
to get any lube inside of them.
 
Thanks, 73 Todd WD4NGG
 
 
In a message dated 8/8/2013 2:11:56 P.M. Eastern Daylight Time,  
w1tag at charter.net writes:
Todd,

Hmmm...top cover off, bottom cover  off, remove the 4 screws holding the 
front panel to the chassis, unplug the  ribbon cables to the front panel, 
remove the panel, remove the 5 screws on  the shield to the front panel, 
unplug the headphone jack cable, remove the  shield, remove the PBT and 
AFG/RFG knobs, remove the nuts on the pots,  unplug the board the pots 
are mounted on, and remove the board. Now you can  change the pots, and 
undo the above!

The pots are pretty well sealed  - doubt you could clean them without 
removing them and drilling holes. My  morning project at work today is to 
clean up the mess left by a customer  that sprayed silicone contact 
cleaner into one of our products, trying to  hit the sealed pots. Not to 
compare the Deoxit with the cleaner my customer  used, though.