[R-390] R-390A Zero adjust

[Bob Young]

I'm looking down between the clutch and the gear in front of it towards the back of the radio and there is what appears to be a bent washer thin enough to compress when the clutch is turned in, I wonder if there is a problem with that? I'm not sure of the name of it but I think it's called a spring washer. That gear moves forward a bit when the clutch is turned in also, I don't think it's supposed to do that.

Bob
KB1OKL

> Date: Sat, 16 Mar 2013 17:09:06 -0400
> From: rbethman at comcast.net
> To: r-390 at mailman.qth.net
> Subject: Re: [R-390] R-390A Zero adjust
> 
> Yes, the disc on the end of the zero adjust knob SHOULD turn.
> 
> The clutch is what should NOT turn freely.
> 
> They are two separate entities.
> 
> The zero adjust plate pushes on the clutch to allow movement of the PTO 
> *without* moving the geartrain.
> 
> That's why the Veeder root counter does NOT move when making a zero 
> adjustment.
> 
> Bob - N0DGN
> 
> On 3/16/2013 4:45 PM, k2cby wrote:
> > The disc attached to the zero adjust shaft on my R-390A (a 1954 Motorola)
> > has always been loose and rotates freely, but it works fine.
> >
> >   
> >
> > As the zero adjust knob is rotated clockwise, the disc at the end of the
> > shaft bears on three pins projecting from the clutch. The disc doesn't turn
> > anything; it imparts pressure, not rotary motion. So long as the pins are
> > depressed the clutch will disengage.
> >
> >   
> 
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