[ICOM] 756 pro II problem

[Dan Cotsirilos]

Thanks Larry




Dan K9DTC


-----Original Message----- 
From: Larry Young
Sent: Monday, October 13, 2014 12:27 PM
To: ICOM Reflector
Subject: Re: [ICOM] 756 pro II problem

Dan:There is very likely something amiss, most likely in the PA module if 
turnng off the power from the radio's power button did not reduce the p/s 
current requirement to zero. Most modern solid state radios leave the +13.8 
v DC applied to the radios PA module when the radio is turned off from it's 
front panel power button.
I suspect you have an intermittent transistor or other pa module component.

Larry K4LXV





On Monday, October 13, 2014 10:38 AM, Dan Cotsirilos <k9dtc at comcast.net> 
wrote:



it has something to do with the bias. I just talked with Matt in St Joe and
his says the power amp is always connected to the PA regardless of the power
switch.




Dan K9DTC


-----Original Message----- 
From: Ken Sands
Sent: Monday, October 13, 2014 9:31 AM
To: ICOM Reflector
Subject: Re: [ICOM] 756 pro II problem

Dan,
I am going to look at the schematic of the Pro 2 and try to find that
resistor,.....STAY TUNED!!

73
Ken

On Mon, Oct 13, 2014 at 10:09 AM, Dan Cotsirilos <k9dtc at comcast.net> wrote:

> Something very strange is going on with my PRO II. I was using a PRO for
> weeks without issues. I upgraded to a PRO II and sold the other. Sometime
> last Sunday with the radio just receiving the power supply Astron 35 got
> super hot. So hot it was melting the cord. I had the supply totally check
> out and nothing was wrong.
>
> In meantime I have been using a Astron 20M (for over a week) with the
> meter in the amp position and this morning after the radio was on for
> about
> 10 mins I went to transmit and saw the display blinking. I looked at the
> meter and it was drawing 20 amps just in receive mode. I shut off the
> radio
> and it was still drawing 20 amps. I turned off the supply disconnected the
> radio and the amps were zero. I reconnected the radio and it works
> perfect!
> Anyone have a clue what could be wrong?
>
> Dan K9DTC
>
>
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----
Your Moderator: Dick Flanagan K7VC: icom-owner at mailman.qth.net
Icom Users Net: Sundays, 1700Z, 14.316 MHz
Icom FAQ: http://www.qsl.net/icom/
To support QSL/QTH.net: http://www.qsl.net/donate.html
----
Your Moderator: Dick Flanagan K7VC: icom-owner at mailman.qth.net
Icom Users Net: Sundays, 1700Z, 14.316 MHz
Icom FAQ: http://www.qsl.net/icom/
To support QSL/QTH.net: http://www.qsl.net/donate.html