[ICOM] Icom Tuning?...Help Please

[Evans8119 at aol.com]

Hi,
I have an Icom IC-290A that I am working on...The problem being that when I  
turn the tuning knob it doesn't change frequencies,it acts as if the knob is  
slipping.
After determining that it wasn't the knob slipping I proceeded to  
disassemble the front to get at the tuning potentiometer.
If your familiar with this unit you know that the potentiometer is  
continuous and has teeth that catch when you turn the knob to make tuning  easier.
Now when I hook up my ohm meter to the wiper and to either end of the  
potentiometer all I get is an OL reading and when I turn the shaft the reading  
jumps around wildly. If I connect the meter to the wiper and to the case of  the(I 
am assuming this is correct?) potentiometer I should get a reading of  Zero 
ohms but again the only reading I get is OL.
 
Am I safe in saying that the potentiometer is bad?
 
If so how do I go about figuring out what type of potentiometer I need to  
replace the bad one?
The schematic doesn't tell me what value it is and there isn't a parts list  
or part number either.
 
 
I hope I have made myself clear enough to be understood,if not please let  me 
know so I can try and make things clearer.
 

Any help on this would be greatly appreciated.
Thank you