[Heath] [Heathkit] SB-401 dial stops hard at 4-1/4 turns

[Glen Zook]

The rotating "fingers" that are on the shaft immediately outside the LMO housing often get "stuck".  Lubricate them with something like WD-40.  

You may have to use a screwdriver to get the fingers unstuck.  Just turn the LMO to where it gets stuck and then "back off" about half a turn.  Spray the lubricant on the fingers and then use the screwdriver to push the last finger on the shaft.  That should loosen the finger.

Again, this is a pretty common problem with the Heath LMOs.

If that doesn't help, then you may have to remove the LMO to get the fingers unstuck.
 
Glen, K9STH


Website:  http://k9sth.com


On Saturday, July 26, 2014 9:32 PM, howard holden <holden7471 at msn.com> wrote:
 


Have you checked the hard stop in the other direction? It should be about 15-20 KHz below 00. If it goes a turn it more below the dial has skipped a revolution in the groove.

Howie WB2AWQ

Sent from my iPhone

On Jul 26, 2014, at 6:20 PM, "Robert Myers" <rsmyers at rogers.com> wrote:

> I was turning the dial on my SB-401 and noticed that it abruptly stops at
> about 4 -1/4 revolutions.  That is, about 25 KHz beyond the '4' shown on the
> upper turns counter window.  It is quite a hard stop.
> 
> The spiral and the nylon follower seem fine - they aren't binding or
> clogged.  And I doesn't look like anything is binding elsewhere that I can
> see.
> 
> Is there anything inside the LMO that would cause this?  Is this a known
> problem by any chance?
> 
> Thanks,
> -- Rob, VE3JQL
> 
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