[Kenwood] TS820S Repair Questions

Sun, 18 Jan 2004 07:51:19 +0800

Hi All,

Bry, I have just repaired my 520S and serviced it for what sounds to be 
the same common problem. It is a bad contact on the grounding wiper 
on the VFO tuning capacitor. It is necessary to pull out the VFO 
completely in accord with the procedure detailed in the maintenance 
manual (available on the web for download). Remove the can and 
clean the wiping contact. Add some contact cleaner and exercise the 
capacitor. Maybe make sure the tension on the grounding contact is 
still OK. Then reassemble making sure to preserve the position of the 
capacitor relative to the dial.

A messy job but once started is not all that bad with care.

At least you can see the components unlike the modern surface mount 
stuff!

I'm not sure what you mean by "tumblers" but the dial scale on the 
main tuning knob can be moved by hand independently of the main 
knob to correct minor calibration shifts - maybe that's all that's 
needed?

73...Don VK6HK

> Hi guys,
> 
> I have a newly acquired TS820S and the VFO is jumping
> around pretty badly most of the time.
> 
> I also noticed that the "tumblers" for the 100 kHz positions
> on the analog dial are not correct either.
> They start coming out at 140 kHz instead of at 100 kHz.
> 
> The VFO jumping is a separate issue. At first I thought it was dirt
> switches - either the function switch or band switch. But then I
> noticed as I get higher up the dial, even the tuning dial itself will
> cause it to suddenly jump from say 7160 kHz to 7885 kHz.
> 
> Does anyone have any ideas about where I might start looking for the
> problem so I can fix it?
> 
> The rig was in storage for several years and prior to that had
> supposedly worked just fine.
> 
> Any tips or pointers would be appreciated.
> 
> Thanks - Bry, AF4K
> 
> - - -
> 
> Your moderator for this list is:
> Larry Wilson KE1HZ [email protected]
> 
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