[Collins] NYC Help with 51J4?

[Bill Kirkland]

DO NOT force the band change. You WILL strip damage gears.

The Geneva wheel in the gear box is the gear disk with the slots in it. You 
can see it from the bottom of the gear box. There is a sheet metal spring
on the bottom of the gear box with a dimple in it. Check to see if the dimple
is worn through - happens alot. This dimple is responsible for keeping the 
Geneva wheel aligned properly.  A slot from the Geneva wheel should always
 be aligned in this dimple. If not you will not be able to change bands
 and the whole gear box will jam up.  If you try to force things you will
 damage the whole gear box.

If the Geneva wheel has fallen out of alignment it is very likely 
that your crystal selection for the bands are all screwed up. You
will have to re-align it. You can easily turn it by hand - none of the 
other gears will change.  You can check crystal alignment by monitoring 
the frequency of the crystal osc or trying a visual inspection of the 
switching wafers. I think this is in my notes.

Since I am using my work email, this may not make it to the group.
Please pass on.  BTW if you wish give me a shout at home some time
 613-591-0550 but let me know a time.

My notes on the gear box are on the CCA as well as a couple of other sites.
Also at my home page http://www3.sympatico.ca/kirklandb/51j_gearbox_v1.pdf

Bill, ve3jhu


-----Original Message-----
From: collins-bounces at mailman.qth.net [mailto:collins-bounces at mailman.qth.net] On Behalf Of eugene at hertzmail.com
Sent: Friday, May 18, 2007 2:10 PM
To: collins at mailman.qth.net
Subject: [Collins] NYC Help with 51J4?


Hello all,

I have a Collins 51J4 that was electrically restored and was working very well for several months.  About 4 months ago, something went awry in the mechanical bandswitching/bandspread where I can no longer change bands, and when I really try to torque the bandswitch, the bandspread flies across the band!

In any case, it is beyond my troubleshooting abilities. I was wondering if there might be a charitable boatanchor enthusiast in the New York City area that I could take it to for a look-see? I am hoping it is something simple.  I would gladly drive 2+ hours in any direction. 

If all else fails, I have lined up someone to fix it, but I am hoping to avoid shipping costs by looking locally first.

Many thanks
Eugene ______________________________________________________________
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