KPA500 Assembly Question

[Jim Bennett]

I Just started assembling my KPA500 serial number 0585 this evening. All was going OK until I got to the point where I mount the Z-bracket to the PA/LPF heat sink. The book sez to use 4-40 5/16" black flat head screws. Using this size screw does NOT pull the Z-bracket tight against the heat sink. I've measured these screws three times and I am certain I'm using 5/16" screws. If I use a 3/16" screw, it works fine. Also, I have verified that I've positioned the PA/LPF properly. So, is the documentation wrong, or is this Z-bracket supposed to be wobbly and not tight against the heat sink?

Thanks, Jim / W6JHB
______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[hidden email]

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html

[Robert Dorchuck W6VY]

I had the same problem (and I think several others have also).  Gary told me to use the shorter screws so it would be snug.  They really need 1/4"  screws or deeper holes.  Mine was serial 370.

Bob  W6VY

Message: 1
Date: Sat, 03 Dec 2011 01:31:28 -0800
From: Jim Bennett <[hidden email]>
Subject: [Elecraft] KPA500 Assembly Question
To: [hidden email]
Message-ID: <[hidden email]>
Content-Type: text/plain; CHARSET=US-ASCII

I Just started assembling my KPA500 serial number 0585 this evening. All was going OK until I got to the point where I mount the Z-bracket to the PA/LPF heat sink. The book sez to use 4-40 5/16" black flat head screws. Using this size screw does NOT pull the Z-bracket tight against the heat sink. I've measured these screws three times and I am certain I'm using 5/16" screws. If I use a 3/16" screw, it works fine. Also, I have verified that I've positioned the PA/LPF properly. So, is the documentation wrong, or is this Z-bracket supposed to be wobbly and not tight against the heat sink?

Thanks, Jim / W6JHB

********************************
______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[hidden email]

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html

[Dave Johnson]

The assembly manual is wrong, I notified Elecraft a few days ago of the
same issue. You should fnd there are enough smaller screws to not run short
when you use them for the Z bracket to heatsink assembly.

73  Dave, G4AON
KPA500 #573
--------------------------------
"I Just started assembling my KPA500 serial number 0585 this evening. All
was going OK until I got to the point where I mount the Z-bracket to the
PA/LPF heat sink. The book sez to use 4-40 5/16" black flat head screws.
Using this size screw does NOT pull the Z-bracket tight against the heat
sink. I've measured these screws three times and I am certain I'm using
5/16" screws. If I use a 3/16" screw, it works fine."
______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[hidden email]

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html

[Jim Bennett]

Sorry about this, guys - this post went out days and days ago - why it is just now showing up is beyond me.. AND, the problem is fixed.

On   Saturday, Dec 3, 2011, at  Saturday, 1:31 AM, Jim Bennett wrote:

> I Just started assembling my KPA500 serial number 0585 this evening. All was going OK until I got to the point where I mount the Z-bracket to the PA/LPF heat sink. The book sez to use 4-40 5/16" black flat head screws. Using this size screw does NOT pull the Z-bracket tight against the heat sink. I've measured these screws three times and I am certain I'm using 5/16" screws. If I use a 3/16" screw, it works fine. Also, I have verified that I've positioned the PA/LPF properly. So, is the documentation wrong, or is this Z-bracket supposed to be wobbly and not tight against the heat sink?
>
> Thanks, Jim / W6JHB
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html

______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[hidden email]

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html