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Mark
I don't know the EQ6 but does it (the HC) come up with auto guide signals like "E"/"W" or "N"/"S" somewhere on the handset display when a correction is made?
If not can you connect using ASCOM POTH (or EQMOD) I think these was a setting to watch communications traffic (is this possible in EQMOD) to an from the mount, since ST4 connects to computer then mount you should see these commands being sent.
If so you can make a cable RJ12 6P6 to fit the ST4 port and stimulate (STIM) the circuit with pules by touching each N/S/E/W connector to earth (actually Autoguider common) and watch the POTH coms for the correct "Mn#", "Ms#" "Me#" and "Mw#" signals. I do something similar with Gemini 1's but measure the buffer inverter circuit IC outputs for the correct output. I guess if you identify the IC on the PCB then look up the specs you could do the same.
Of course you could do the same and watch the gear train for movement!...very slow!
Lastly have you tried pulse guide instead?
FWIW.
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