K2 Encoder Question on 7415 build

[Glenn Haffly-2]

I have a question on the length of  the 4 wires from the encoder board to
the front panel. If they are too short the encoder is too far forward
resulting in the front panel buttons out of alignment.
Having the wires longer cures the front panel alignment but , Then the back
of the encoder board is contacting the rear of the control board. Anyone
else observed this?

Thanks , Glenn
K5ZE
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[Don Wilhelm-4]

Glenn,

The encoder board does come VERY close to the Control Board.  You must
flush cut the encoder leads and flush cut the area indicated in the
Errata sheet on the control board.  Flush means really flush, trim into
the solder fillet.

Observe the instructions for mounting the encoder shaft. .
Make the wires as long as necessary to pass through the encoder board,
then solder and flush cut them.

If you are still concerned about contact, some electrical tape over the
encoder board is extra insurance, but should not be reuired if you did
everything right.

73,
Don W3FPR

On 2/27/2013 11:01 AM, Glenn Haffly wrote:
> I have a question on the length of  the 4 wires from the encoder board to
> the front panel. If they are too short the encoder is too far forward
> resulting in the front panel buttons out of alignment.
> Having the wires longer cures the front panel alignment but , Then the back
> of the encoder board is contacting the rear of the control board. Anyone
> else observed this?
>
>

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[Christophe F8ACF-56]

Glenn and goodnight all

I'll put this link:

http://cjoint.com/?CBBvSo5XnWP

if here can help you to see a little more clearly the way I mounted here

# 7369

 
73 , Christophe F8ACF-56


________________________________
 De : Glenn Haffly <[hidden email]>
À : [hidden email]
Envoyé le : Mercredi 27 février 2013 17h01
Objet : [Elecraft] K2 Encoder Question on 7415 build
 
I have a question on the length of  the 4 wires from the encoder board to
the front panel. If they are too short the encoder is too far forward
resulting in the front panel buttons out of alignment.
Having the wires longer cures the front panel alignment but , Then the back
of the encoder board is contacting the rear of the control board. Anyone
else observed this?

Thanks , Glenn
K5ZE
______________________________________________________________
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[N4KTR]

Glenn,

I just passed this point in the build of my K2 (7418) and didn't have any difficulty.

The instructions on p. 32 specify the length of the four wires as 1.5" and this was more than enough length to properly connect the front panel board to the encoder pony board. With the encoder pony board soldered to the back of the encoder, and the encoder, in turn, bolted to the front panel, the distance between the encoder pony board and the front panel board (also attached to the front panel) is fixed. In other words, the wire length doesn't determine this spacing but needs to be of sufficient length to span this distance. On my front panel assembly, this distance is just under 7/16", a distance easily spanned by a 1.5" wire. Check to see how you're sequencing this part of the assembly; i.e., the four wires don't get soldered to the pony board until this distance is already established by the mechanical assembly.

As for the control board to encoder pony board spacing, I agree it appears to be tight. I wasn't aware of the errata Don mentions and, therefore, didn't initially flush trim any of the interference on the control board. Upon initial fit of the control board, the back of the encoder pony board appeared to get hung up on the pins for the U6 socket on the control board. Once I flush trimmed the lower row of those (plus the IC pins on the pony board), there appeared to be adequate clearance. I've completed all resistance checks up to this point as well as the initial power-up without any problems.

Scott
N4KTR