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I bought a used TS930S that works well except that the tuning dial seems to slip. Not all the time, just some time. Sometime if I just want to tune a few hundred hertz I may have to turn the tuning knob 1/2 revelation or more. Any suggestions what the problem might be? Thanks.

Greetings. KE5KDT here. I understand that this has an optical dial like my VFO-230 does. My VFO has two optical sensors and a large disc connected to the tuning dial that has small slots around the circumference. AS you turn the dial the optical sender/receiver interprets the rotation and speed. On my VFO I would have to spin the heck out of it to get it to change the display just a little and it only went up not down in freq. I got inside and noticed that there were two adjustable slugs/coils and I started playing with them a bit at a time until I got it to work correctly. If the TS-930 is the same then you might want to start making some very small adjustments on those coils to see if you can get it to start behaving.
Bob

I did not quite understand that reply by leer66.
W4BCD, Did you manage to fix your 930?
...Al

Thought I'd best post Bob's reply here for the benefit of others. 73 ...Al

Bob - Thanks a ton! My old 930 is getting cranky, mostly from disuse. ... Al
P.S. That's a beautiful Stearman model on your .com page!

On Feb 22, 2009, at 5:59 PM, Bob Verlander wrote:
Al, Yes, my 930 tunes perfectly now. Clif, KA5IPF (the resident TS-930 Yahoo
Group expert), provided me with two fixes, which I list below. Since I do
not have a scope I went with Method 1. It’s real easy. I didn’t have to
remove the top cover; just the bottom. You shouldn’t have any trouble.

Method 1:
Covers off, radio upside down, and VFO knob pointing to your bellybutton.
Directly behind the VFO knob is a small circuit board mounted horizontally.
This is not the main board but a little one mounted to the front panel.
In the back left corner of it are 2 small pots. There are also holes in the
PCB to adjust them.
Carefully note the position of each, give a few back and forth motions, and
reset to the original position.

Method 2:
To use a 'scope I usually connect to ME1 and ME2 (Main Encoder 1 & 2) on the
Digital unit but you can pick up the signals on the small board.
The pots are adjusted for a square wave with a 50% duty cycle. One pot each
for ME1 & 2.
It takes longer to talk about it than it does to do it.

Good luck. Bob, W4BCD