[TowerTalk] Help with a Yaesu Rotator

[Jack Brindle]

Are you sure the wires to the rotor are OK? One of these (there are only two that drive the motor) building up resistance could cause the same symptoms. Check the connectors especially.

73!
Jack, W6FB

> On Feb 5, 2019, at 4:27 PM, Grant Saviers <grants2 at pacbell.net> wrote:
> 
> 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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