If the the meter stays on the left, check the 1/8 amp fuse
Skip, KJ6Y.
Communications Service Co
Sent from my IPhone
> On Jul 12, 2020, at 4:08 PM, Gary Slagel via TowerTalk
> <towertalk@contesting.com> wrote:
>
> I was in the calibrate position... reattached the rotor wires and turned it
> off and the meter was staying on the far left when I powered up. For a few
> seconds the meter was moving and it looked like it was going to work, then
> the meter took a couple big jumps and quit moving leaving me at about a SE
> position. Now its back to acting like its in calibrate (meter jumps to full
> right side on power up) and no movement. Tried jumping terminal 5 to 8 and
> then rocking it but no good. Bad to worse, I'm not sure if I was actually
> turning the antenna when the meter was moving! I think it ended up 180
> degrees from where it was but I'm not 100% sure its not in the original
> position.
> Feeling a little foolish and will wait till morning to jump back in hihi
> Gary KT0A
>
>
> On Sunday, July 12, 2020, 04:12:45 PM MDT, Dave Hachadorian
> <k6ll.dave@gmail.com> wrote:
>
> You may have opened the clockwise limit switch AND the brake wedge may be
> stuck. The usual way to overcome a stuck brake wedge is to rock the
> antenna in one direction or the other to free the wedge. If the Cclockwise
> limit switch is open, you can't rock the rotor clockwise.
>
> To bypass the Clockwise limit switch, jumper terminals 5-8 on the
> controller. Then you can briefly rock the antenna clockwise, and then turn
> it CCW out of the limit switch.
>
> Dave Hachadorian, K6LL
> Big Bear Lake, CA
>
>
> -----Original Message-----
> From: Gary Slagel via TowerTalk
> Sent: Sunday, July 12, 2020 1:49 PM
> To: towertalk@contesting.com
> Subject: [TowerTalk] Troubleshooting HamIV rotor and controller
>
> Hi guys,
> I have a HamIV rotor that's 4 or 5 years old and a companion controller that
> has an aftermarket brake release delay installed on it. Yesterday the
> rotor quit turning. When I turn on the rotor control the light comes on,
> the needle swings to the far right which is right where the rotor is turned
> to.
> I've checked the fuse and its good. I've been through the HamIV manual
> troubleshooting section and measured voltages and resistances and come up
> with the following anomalies:
> With controller plugged in and powered on and all terminal wires removed:
> manual says the needle should remain on the left hand S but mine swings to
> the right
> All other voltages described in manual look good except terminals 3
> and 7 should show 13VDC but show zero
>
> With controller unplugged and terminal wires removed: Resistance
> across line cord is 4.5 ohms with brake lever depressed
> All other resistances seem consistent with troubleshooting
> suggestions except they are low (1.5 instead of 4)
>
> Resistances measured on the control cable: These all seem reasonable
> compared with where the manual says they should be except the resistance
> across the entire pot switch (term 3 and 7) is 290 instead of 500.
> Resistance across Pot Arm to +end and -end total 290 ohms at 1 ohm and 289
> ohms.
>
> Just hoping someone might have an idea where to look next. My next idea is
> crank down the tower, look at connections and listen for noise when hitting
> the brake and turning levers. Next, beam off and rotor onto the bench to
> see if it works with another cable.
> Thanks for any thoughts
> Gary SlagelKT0A
>
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