[DG] [DG] AH4000 control unit replace

[KariR]

Hi Derek,

Thank's for your reply. I may look after the ST4000 in second hand shops. On the other hand, does the T70281 kit work well with the old drive unit? I'm interested in connecting the autopilot to my chartplotter.

I may have now a third possibility: I found that one of the Darlington transistors regulating the power to the drive unit is broken (short cut between B and C). I'm just waiting for a new transistor and after replacing the old one the control unit may work again? Anyway, this is a cheap try (less than 1 €/ transistor + delivery costs). This failure with the power may explain the earlier sudden drops from auto to stand by and the final stop of working, where I found that the control unit gave only 0,1 V to the drive unit. (However, in this case no possibilities to connect to the chartplotter.)

Best regards,
Kari