[ICOM] Pro3 Fan Questions

[Alan Zack]

As you are a new owner of a 756ProIII let me make you aware of a problem 
some of
us are experiencing with this rig.

Check out the thread (Icom) IC-756PROIII No Transmit.

My 5 month old 756P3 is back at Icom for the second time. The first time
there was no mention of what the problem was. They just fixed it, boxed 
it up, and sent it back to me. There was a list of Icom part numbers but 
no indication of what these parts actually were. Now, for the second 
time it is back, the service center called and told me both my no 
transmit failures were due to blown diodes on the control switching 
board caused by ESD. Seems in the SW dry states there is enough static 
electricity in the dry air to enter the rig through the coax and destroy 
these diodes. I use a LDG DTS-4 antenna selector switch that 
automatically grounds all my antenna connections when 12 vdc is removed 
from the ant switch when I switch off the rig and P/S. I also have 
Polyphaser surge protectors in line with my coaxes at the base of my 
tower where the coax goes under the ground. The surge protectors are 
grounded to the base of the tower via the section of the tower that is 
underground, by three 8 ft ground rods, one at each leg of the tower, 
and by a 10 ft deep, 8 ft wide rebar cage so I am at a loss of how this 
static electricity gets into my rig and causes ESD. My next step will be 
to install additional surge protectors where the coax enters my home. As 
it is, there is a 18 ft run of coaxes and rotor cable running 
underground from the base of the tower to the wall of the house with 
about 12 inches exposed before they enter the wall. I will put an 
additional set of suppressors there attached to a 8 ft ground rod.

Several others on this reflector have reported their 756Pros losing 
transmit due to Icom telling them it is caused by ESD. Just something to 
be aware of.

73 & GL




_______________________________________________________
Alan Zack
Amateur Radio Station K7ACZ
Official USCG Auxiliary Comm Station
Las Vegas, Nevada, USA
Delta Rocket Quality Engineer, The Boeing Company, Retired
Aviation Chief Warrant Officer,  U.S. Coast Guard, Retired



----- Original Message ----- 
From: "Bob Beatty" <rbeatty at mpinet.net>
To: <icom at mailman.qth.net>
Sent: Sunday, July 26, 2009 7:21 PM
Subject: [ICOM] Pro3 Fan Questions


>I have just received a new Pro3 and am having some issues with the fan.
>
> 1.  Without keying the rig, the fan periodically comes on and runs for
> about a minute and shuts off.  Is this normal?
>
> 2.  Today (7-26), the fan began to run whenever the rig was keyed and
> would
> stay on from 30 seconds to 1+ minute.  By "keyed", I mean clicking the
> PTT
> and letting up.  This operation seems excessive.  I thought the fan
> was
> thermostatically-controlled and would only run when it got hot enough.
>
> I do not find the fan action mentioned in the owner's manual and I
> don't
> know if there is a user adjustment for what is happening.
>
> Any suggestions, opinions, etc. are appreciated.
>
> 73,
> Bob W4VQ
> w4vq at arrl.net
> ----
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