[ICOM] 756ProII Resets on Transmit

[paul at w8aef.com]

I had the same problem with mine a couple of years ago.  C131 a .1 uF 
coupling capacitor in the R.F. A unit shorted, which created a feed back 
loop that kept the receiver enabled during tranmit and put the tranmitter 
into full power output (the loop is after the ALC circuit) and my Astron 
RS-35 went into current limiting and shut down.  The exact symptoms you are 
having.

As I recall the capacitor and the PIN diodes are easily accessible on the 
back side of the circuit board.

The shorted capacitor also took took out a couple of PIN diodes before I 
found a fixed the problem.

de Paul, W8AEF

----- Original Message ----- 
From: "Frank N. Haas" <kb4t at arrl.net>
To: <icom at mailman.qth.net>
Sent: Sunday, April 24, 2005 2:23 PM
Subject: [ICOM] 756ProII Resets on Transmit


> Greetings all:
>
> I believe this has been covered here but I don't recall the solution and 
> I'm trying to figure out how to wade through the archives.
>
> My 756ProII has developed the problem of RESETTING (shutting off and 
> immediately back on) the moment I attempt to transmit. Even with a dummy 
> load connected to the antenna jack and RF POWER set to 5 watts, the moment 
> I key the transmitter in any mode, the radio shuts off and turns back on.
>
> What is the standard cure for this problem?
>
> Thanks!
>
> 73,
>
> Frank N. Haas KB4T
> Florida