[CQ-Contest] low output on IC756Pro II/solved

[AB2E Darrell]

Hello Everyone,
Thanks to everyone who replied with suggestions or a similar experience. 
Several of you asked me to post the solution, so here it is. I recently had 
the rig on a flight from EU, and Icom says it's likely the vibration changed 
an internal setting or 2.

The solution is to adjust R507 on the Main A board (remove the bottom 
cover). This pot is tiny, and also the label is almost an inch away due to a 
chassis screw and other components in the area. Locate the adj pot for the 
Speech Syth, which is also in that area, or the chassis screw. Before 
adjusting, set your xmit freq to 14.10000, mode=RTTY,Tuner - off, RF Power - 
Max. Next adjust R507 (using a dummy load) for 100 watts.

This solved the problem. Before the adjustment I had 75W out, now I can 
easily get 100W out and all is again well.
This solution was provided by Icom tech support over the phone.

73 Darrell AB2E





>>----- Original Message -----
>From: "AB2E Darrell" <ab2e at hotmail.com>
>To: <cq-contest at contesting.com>
>Sent: Monday, October 27, 2003 2:57 PM
>Subject: [CQ-Contest] low output on IC756Pro II
>
>
> > Hello,
> > After CQWW last night, I noticed my IC756 Pro II is only putting out a 
>max
> > of 75 Watts on most bands. Has anyone had this experience? Is there an
> > internal adjustment for power out?
> > Has anyone replaced the power transistors?
> > Any info appreciated.
> > Thanks and 73,
> > Darrell AB2E
> >
>

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