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Re: Yaesu G-5500 debugging help request



Mark:

Have you checked the wires at the rotor - I had a similar situation and found
one of my wires at the rotor had a poor solder joint and had come loose and was
shorting with another wire.

73's

Don Woodward
KD4APP
AMSAT 33535
kd4app@amsat.org
http://kd4app.webhop.org


----- Original Message -----
From: "Mark L. Hammond" <mlhammond@charter.net>
To: <amsat-bb@AMSAT.Org>
Sent: Sunday, September 08, 2002 16:44
Subject: [amsat-bb] Yaesu G-5500 debugging help request


Hello all,

Well, about 2 weeks ago I asked about burned out bulbs in my G-5500
controller.  Well, I hadn't even had the cover off to look at them, and
another problem has surfaced.  This is not impressing me since the unit is
only 1.5 years old and has not been abused.  Use of the rotators hasn't
even been daily.

In any event, the elevation meter reads 0 deg no matter what position I
move the rotator to--from 0 to 180 degrees.

Obviously it could be one of the wires to the position pot (it's just a
variable resistor pot, right?), or the pot has gone bad.

 From what my meter tells me, it seems like contacts/screws numbered 1 and
2 (on the back of the controller, where the wires run to the rotators) are
involved.  Seems like contact 1 is the reference voltage (measures 6.12 V
DC on the EL side, 5.94 V DC on the AZIMUTH side), and contact 2 is the
feedback/position voltage.

On the AZIMUTH side contact 2 varies from nearly 0V (0 deg) to ~4.35V (360
deg) ; all looks well.   On the ELEVATION side, it is interesting--while
the meter doesn't move, contact 2 reads about 0.5 millivolt at 0 deg, 4.0
millivolts at 45 deg, and 8 millivolts at 90 deg.  So, it's "sort of, kind
of" working.

Any of you G-5500 repair/debug experts have any advice?

How about instructions for replacing the position indicator resistor
pot?  Seems like I've seen that on this BB before.

Thanks in advance,

Mark L. Hammond  [N8MH]


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