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Re: [TowerTalk] Troubleshooting HamIV rotor and controller

To: towertalk@contesting.com, towertalk@contesting.com
Subject: Re: [TowerTalk] Troubleshooting HamIV rotor and controller
From: kj6y--- via TowerTalk <towertalk@contesting.com>
Reply-to: kj6y@aol.com
Date: Sun, 12 Jul 2020 20:52:01 +0000 (UTC)
List-post: <mailto:towertalk@contesting.com>
Sounds like you are in the calibrate position.  Check the calibrate switch.

 Skip Bolnick, KJ6YCommunications Service Cowww.kj6y.com818-522-5421  In a 
message dated 7/12/2020 1:49:34 PM Pacific Standard Time, 
towertalk@contesting.com writes: 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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