[Elecraft] KBPF3 mod kit

[Ron D'Eau Claire]

Hello Dale:

One of the significant mechanical changes to the K3S was a battery holder that lets the battery lie flat so it can be replaced without pulling the KRX3 enclosure. Also, lying flat the battery does not need a protective cover.

Yes, the battery lasts a very long time, like the bios battery in your computer. All it does is keep the real-time clock running when power is off. The battery is unimportant if you don't use the clock. If you do use it or just want to have  good battery in place, why not change it after 5 years if you are "under the hood" anyway? You need a CR2032 3-V battery.    

I would remove the left side panel (the side panel with the handle) along with the top cover, Then loosen the two long screws that hold the KRX3 enclosure in place and lift it enough to take the battery cover off and replace the battery. Having the side off makes it easier to ensure the interface boards between the KRX3 module and the RF board are seated when you replace the KRX3 module. With a little care you won't have to disconnect the TMP coaxial cables.

Be sure to replace the battery cover. The positive (rim) of the battery can short against the bottom of the KRX3 enclosure if it is left off. 

When you replace the side cover, be sure to replace all SEVEN screws, including the one near the forward end of the handle. That screw is easily overlooked but is essential for proper shielding.

73, Ron AC7AC

-----Original Message-----
From: Elecraft [mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Dauer, Edward
Sent: Monday, March 13, 2017 2:12 PM
To: elecraft at mailman.qth.net
Subject: [Elecraft] KBPF3 mod kit

I just ordered the KIO3B and a KBPF3 mod kit for the K3.  The process of installing the KBPF3 mod provides access to the small battery under the plastic protective cover.  The K3 is about five years old.  Would it be worth replacing that battery while I am in there, or do they last essentially forever?  The mod will also require removing the Sub Rx.  As I remember, that was the most frustrating part of the original build.  I would appreciate any tips on how to remove and – especially – replace the Sub Rx with a minimum of cussing.  Would removing the right side panel help, or would that just complicate things?

Tnx,

Ted, KN1CBR

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