>>12. There is NO loss or change in the receiver! Signals stay the same whether or not in operate or standby.<<
>>"I believe another relay is responsible for T/R"<<
Shouldn't be a relay involved when the QSK kit is installed, the T/R switching relay is what the solid state PIN diodes replace.
Receiver working in either state of amp means the QSK board is not switching now. It is very likely stuck in the amp bypass mode. Since it is all solid state this must be due to a circuit fault of some kind, not a simple stuck mechanical relay or anything you could return to working order with a mechanical push somewhere, unless the fault was caused possibly by a bad connection. It is, after all, Ameritron, and the bad connection situation has been seen before, solder joint never soldered comes to mind. That will work right up until the point where carbonization or the like becomes too high of a resistance for the circuit path to function anymore, so you might take a look at all connections too and from the QSK board to see if they look properly soldered, screwed, or whatever, and tight.
Have you tried the basic CW test as described in the Ameritron QSK-5 manual? http://www.ameritron.com/man/pdf/QSK-5PC.pdf
The QSK line from rig to amp is critical IIRC, there is a timing issue here. Check the line carefully for fault, disconnect, etc. first. Check the rig to see if the QSK line is still active and if it is timing correctly, QSK line MUST become active before RF output at rig. This will require an oscilloscope, preferably a dual trace triggered job, freeze function would be desirable to take a single snapshot, but not necessary by viewing a dash string, one trace on the QSK line, the other on the RF out of rig across dummy load. Trigger off of the leading edge of the rig's QSK line.
From the QSK-5 manual:
CAUTION!! This jack must always be directly connected to the transceivers QSK output line.
NEVER attempt to operate the amplifier without this jack properly connected.
Do not connect any devices between this jack and the transceiver.
This jack provides the connection from the Key 2 terminal (D) of the circuit board. This jack has 5 volts open circuit and supplies a maximum of 1 mA of current.
This jack must be pulled low (below 2 volts) at least 1 mS before RF is applied to the amplifier.
The jack must not be returned to an open circuit
condition before RF is removed from the amplifier.
Failure to comply with these restrictions will damage the amplifier or the QSK board.
The QSK board will inhibit the receive signals for one mS after this jack returns to an open or "high" condition."
If the above is seeming to be a bit much to you, call Ameritron Customer Service.
But you do need to know if the fault originated with the rig or the amp here, could be either if this is the problem and sounds like it surely is.