[time-nuts] HP 10544A Repair

Bob Camp kb8tq at n1k.org
Sun Feb 28 10:01:45 EST 2016


Hi

It’s not an electrical issue as much as a heat issue ….

Before you start, consider that you will be doing something like:

Move trimmer 1 turn CW
Wait 10 minutes
read frequency
Move trimmer 1 turn CW
wait / read
Move trimer 1/2 turn CCW
wait / read
Move trimmer 1/4 turn CW
wait / read
Move trimmer 1/8 turn CCW
wait / read
Move trimmer 1/16 turn CW
wait / read
Move trimmer 1/32 turn CW
wait / read

That is indeed an ideal version. You likely will do multiple steps at each of the stages rather 
than get it right the first time. The part needs to be warmed up for a few days before you 
can get to the 1/32 turn level. You also need a good standard to compare to.

Bob


> On Feb 28, 2016, at 2:53 AM, Nigel Vander Houwen <timenuts-nigelvh at nigelvh.com> wrote:
> 
> Mark,
> 
> I don’t see that referenced in the documentation, and the frequency adjustment pot appears to be plastic, but I will compare a non-conductive tool, to a conductive one to see if it makes a difference.
> 
> Nigel
> 
>> On Feb 27, 2016, at 19:11, Mark Sims <holrum at hotmail.com> wrote:
>> 
>> Also, when messing with a 10544A be aware that  that the frequency tuning adjustment must be made with an insulated tool. 		 	   		  
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