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Look at the A5 card. It has the K5 mounted on it. Look at the back side of the card also. Burn spots are not good. Often the are traces that have been burnt in half. Burned up components are not good. Sometimes you can fix them. Some times buy a new/used card in ebay, or Forum member KLOPPK...

You need to read the TM's. The TB1 is changed by taking off the mounting nuts and moving the board. The instructions for moving the board are on the sheet you posted. Why do you want to move it? Or check it? There is nothing wrong with your main generator. Get into the -34 TM. Read about how...

You said that it makes proper voltage when the S2 is held in the start position. That means the man gen is good. That means the S9-1 switch works, in its first position. When the S2 is released, the S9-1 reverses its contacts, and the the Initial excitation is turned off, and the Static...

One side should be un hooked to do it right. And you know how to check diodes right?

Also, the listings I saw in epay showed the whole VR. You don't need that. The card alone will fix the problem. Look up the card NSN and part number. Look for just that. Its got to be cheaper then the whole VR.

Was the card disconnected? Did you un solder one end of the components before testing?

99.99% of the time its a Volt reg. And yes, if you have not downloaded the TM's, you should. I saw a card on flee-bay not long ago.