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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