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[K0RO]

My G-1000 rotates at normal speed clockwise but at half speed counter-clockwise.  Voltage on motor lines read 29 VDC clockwise and -11 VDC counter-clockwise.  Voltages should be equal but opposite in polarity.

Controller was sent to Yaesu but they find no problem with it.  It drives their test-bench rotor properly in both directions.  Voltages are nominal.  And a test of the rotor on the tower powered by my shack power supply without the controller shows proper rotation speed in both directions.

Any ideas?

Ralph Bolt, KØRO

[KB7TT]

Flakey connection on a wire?

[K6AER]

If the voltage out of the controller is correct then you have a bad cable connection to the rotor.

[K6AER]

Also check the reverse polarity diode on the rotor switch.

[W1AN]

Ralph, You will need to check for past water caused corrosion on the cable connector or on the rotor connector itself.  The corrosion could provide a signal path to terminal 6 from your CCW voltage. This may cause the controller to go to slow speed. Although auto slow speed limit switches are not used on the G-1000DXA, I believe the controller uses the same circuit board as the G-2800DXA.  Disconnecting pin 6 at the controller end may confirm. Checking for a voltage change at terminal 6 as you change from CW to CCW could also confirm.
John W1AN

[K0RO]

Thanks guys.  I appreciate the responses.  I intend to follow each suggestion as I search for the problem.  I'll post my findings.

73, 
Ralph Bolt, KØRO