I'm not sure that you have definitively isolated the problem to the
rotator. The controller motor drive circuit has current regulators in
it so they may be confusing the measurements. I think connecting a DC
supply to the motor leads w/o the controller and then see if the rotator
rotates both directions and the internal diodes and limit switches work
properly will be definitive.
The Yaesu controller is a zoo both mechanically and electrically (I'll
never fix another one) and many are replaced with Green Herons. I
thought I had a redrawn schematic by a ham that delved into the
controller, but couldn't find it. Perhaps another TTalker has a copy.
The factory one in the manual is not at all logical and is very
difficult to understand.
Grant KZ1W
On 2/5/2019 14:57 PM, Dick Allardyce via TowerTalk wrote:
I need a little help troubleshooting a Yaesu G800DXArotator. The rotator is about 5 years old and has been working fineso far. It has been used for turning astack of 6/2/432 yagis
– pretty light load. The problem started when I turned full CCW and it wouldn’t return. My initial suspicion was a limit switch so Iordered a couple and waited for
decent weather to remove the rotator from thetower. I did that this past weekend.Bench testing seems to exonerate the limit switches and theassociated diodes. The control unit
issending +/- 29 VDC to the rotator eliminating the CU and the cable andconnectors. With the cable connected tothe rotator I measure 29 VDC when the CCW switch is pushed, but only
18 VDCwhen the CW switch is pushed. The motorbuzzes a little, but will not turn with the 18 volts. The suspicious unit is the “filter unit” between the limitswitches
and the motor. The filter “looks”OK, but I have no idea how to test it. BTW, no sign of water in the bottom of the housing.Has anyone had experience with this type
problem with aG-800DXA/G-1000DXA/G-2800DXA? Regards,Dick N4RA
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