Schematics for KPA500 REV "B"

[w4sc-2]

The “Rev” that is silkscreened on the board reflects the revision level of the bare board, NOT the assembly revision level of the module which will reflect changes made to the module and could any component, hardware, or circuit changes.  The module revision level should be reflected on an attached label, written on the pwb (i.e. “ASSY C2”) in a conspicuous location, or not(?).

Ben W4SC

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[ANDY DURBIN]

"I have a PA board with "REV B" "silked" on it, but the schema I was supplied with is for "REV A". I know there are differences."

I received KPA500 schematics from Elecraft about 2 years ago.  This set includes sheets that are at rev C and rev D but the sheet "KPA 500 PA Module" is rev A.

KPA500 LPF Bank, LPF Control, and TR Switch are all rev D

I don't know the history of changes to the PA board but it would be possible to have a change to the PCB that did not require a change to the schematic - e.g. elimination of corrections made by cuts and jumpers.

If there is a later version of the sheet "KPA 500 PA Module" I would like to have it too.

(Pedant alert - The schematic really is titled "KPA 500" with a space, not "KPA500")

Andy, k3wyc
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[4z1tl]

Thanks for clarifying.

 

So what can I understand from a small white label on the board, saying this: ?


17226

0812B

OO31

 

 

I Am asking for the proper schematics because I can’t locate a certain 270 Ohm resistor on my physical PA board.

This resistor appears on a “REV Ä” schematics from 02/16/11 (it’s part of the input attenuator I think).

 

Isaac, 4Z1TL

 

מאת: w4sc <[hidden email]>
נשלח: Wednesday, 8 July 2020 16:28
אל: [hidden email]; [hidden email]
נושא: [Elecraft] Schematics for KPA500 REV "B"

 

The “Rev” that is silkscreened on the board reflects the revision level of the bare board, NOT the assembly revision level of the module which will reflect changes made to the module and could any component, hardware, or circuit changes.  The module revision level should be reflected on an attached label, written on the pwb (i.e. “ASSY C2”) in a conspicuous location, or not(?).

 

Ben W4SC

 

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