[TenTec] centurion

[Floyd Sense]

The problem is not on the QSK board, it's on the Filament/AC board.  Q1 
and/or Q2 are bad.  You'll need to pull the board out so you can get to 
Q1, which is on the back side of the board.  To do that, you need to 
heat the large filament lead till the solder flows and then pull up on 
that corner of the board to separate it from the filament lead.  Before 
doing that, there are a couple of screws to remove that hold the board 
in place.  You don't need to remove any of the other leads attached to 
the board - you'll be able to turn it over easily.  This problem can 
occur when a tube shorts, or if you fail to allow time for the filter 
caps to drain their charge before removing the cabinet top.  If the 
cabinet interlock closes and draws an arc, you'll probably lose Q1 
and/or Q2.  When you disassemble the aluminum piece on he rear of the 
board from the board, don't lose the two spacer washers or the two 
ceramic washers.  The metal washers are necessary to properly space he 
board so it isn't bent when you reassemble and tighten the two screws 
that engage the metal lugs.  Use a 2N3055 for Q1 no matter what's there 
now.  Q2 is obsolete, but you can find them on eBay.  They may not have 
the same case type as the original - don't be concerned about that.

You can email me if you have any further questions about the fix.


73, Floyd - K8AC


On 3/27/2018 10:09 PM, Rodney wrote:
> I have  plate current of 190m in stand by should be 0 , trouble is on the QSK board no.81542 I think it is Q1 and D2 anyone have any info on this problem. 73 Rod
>
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