Dan:
My Ham IV manual, circa 1987, shows the following between terminals when
checking
from the ground:
per table 2 on page 20
To Check resistance between terminals
Brake Solenoid .75 ohms+leads 1-2
1/2 motor winding 2.5 ohms+leads 1-8
1/2 motor winding 2.5 ohms+leads 1-4
1/2motor+switch 2.5 ohms+leads 1-6
Entire Motor 5 ohms + leads 8-4
Right Limit Switch 0 ohms +leads 8-5
left limit switch 0 ohms + leads 4-6
entire pot switch 500 ohms 3-7
pot arm to + end 0 to 500 ohms 3-1
pot arm to - end 0 to 500 ohms 1-7
Also:
1. With unit plugged in, terminals 1&2 should show 30 volts AC when the brake
lever is pressed.
2. Terminals 1&5 should show 30 volts AC with brake release lever depressed and
CW lever depressed.
3. terminals 1 & 6 should show 30 volts AC with brake release lever depressed
and
CCW lever depressed.
4. Terminals 3 & 7 should show approximately 13 volts
"Resistances with unit NOT plugged in:" page 20 of manual:
terminals 1&2 reads .4 ohms (same as David's reading)
should be same value across terminals 1 through 5 with clockwise switch lever
(right hand) depressed and across terminals 1 through 6 with counterclockwise
(left) depressed.
Resistance across the input line cord with on/off switch in the on position and
brake lever depressed should read 3.8 ohms.
all of this per page 19-20 of manual. My rotor has a serial number of 87023.
Hope this helps.
Tom, WW5L
David O Hachadorian wrote:
> My Tailtwister manual says .4 ohm. I think your manual
> has a typo.
>
> Dave Hachadorian, K6LL
> Yuma, AZ
> K6LL@juno.com
>
> On Wed, 28 Nov 2001 10:19:55 -0500 "Dan Evans" <n9rla@yahoo.com> writes:
> >
> > Hi Folks,
> >
> > A local friend brought over a Ham IV control box this past weekend.
> > He told
> > me it quit working, and wanted me to check it out for him. I've
> > never owned
> > a Ham IV, but luckily he brought the manual over with it. I ran
> > through the
> > test procedures outlined in the manual and everything seemed OK
> > except for
> > one part. The manual says checking resistance across terminals 1
> > and 2 [and
> > several others] should read 4 ohms. My meter shows this as .4 ohms.
> > Now I
> > don't have any reason to doubt the accuracy of my meter, but this
> > isn't much
> > resistance. Does this sound like a problem? Is this an indication
> > of any
> > common failures?
> >
> > All of the voltage checks the manual called for were correct.
> >
> > Thanks for the help,
> > Dan
> >
> >
> > Dan Evans N9RLA
> > Scottsburg, IN 47170
> > {EM78}
> > IN-Ham list administrator
> > QRP-l #1269
> > 1/2 of the N9RLA /R no budget Rover Team
> > Check out the Rover Resource Page at:
> > http://www.qsl.net/n9rla
> >
> >
> >
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