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#1
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Need Help with TS-120S VFO Stability
I suggest resoldering the connections to the frequency determining
components. If there are any mechanical linkages or bearings, those could be needing some cleaning and/or lubrication. Especially look for wiping contacts that could have a thin film of corrosion. If it's permeability tuned, there are no wiping contacts. But the slug could be loose or dirty. Look for cracks in capacitors that could cause capacitance jump with temperature or movement. Measure the supply voltage on the oscillator; if it changes when the shift occurs, the trouble could be caused by a zener diode. I could go on, but you get the drift. (that;s a pun) 73, Bob |
#2
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Clean the switch contacts for the RIT control. Or at least cycle it rapidly
several times and the problem will go away. -- Clif Holland, KA5IPF AVVid Authorized Kenwood and Icom Service Center 816 W Shady Grove Rd Irving, TX 75060 www.avvid.com 1-800-214-5779 972-870-0630 (Local) "tlee" wrote in message ... I recently bought a TS-120S that every so often will just jump 4-8khz off frequency without touching knob. This is not a gradual drift but a direct jump. I have removed the VFO and removed VFO shell case and tightened all screw backup as suggested in kenwood service bulletins, but it is still doing this. Any ideas or help would be appreciated from the technical people out there. 73 Ted N8GPQ |
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