[ICOM] More on my Pro3 pwr issue

[Bruce]

Try this:
Remove covers, bottom cover specifically. There is a shield plate that
covers the RF B unit, remove the shield then
find a gray coax cable that plugs into J101 on the RF B unit, this is the Rx
signal from the tuner control unit. Unplug this cable from J101, now try Tx
again. Does Tx now work without dropping in level?

-----Original Message-----
From: icom-bounces at mailman.qth.net [mailto:icom-bounces at mailman.qth.net] On
Behalf Of KI9A at aol.com
Sent: Sunday, October 27, 2013 7:21 AM
To: icom at mailman.qth.net
Subject: [ICOM] More on my Pro3 pwr issue

OK, need some ideas here, gang. Would like to cover all bases before losing 
 my rig for a few weeks at the shop.
 
My P3 has an intermittent power issue, here is what it  does.  
 
When turned on, shows 90-100 watts, key down, all bands, into a dummy load, 
 and antennas. I hear the fan kick on during xmit. After about 30 seconds 
of cw,  or SSB, the power drops to the following:
 
160m  8w
80m  40w
40m 30w
20-15-10m 8w
 
If I leave the rig turned on, it will recover to full 100w in about an  
hour. If I turn it off, it will recover in about 15 min. Which almost leads
me  
to think its a poor solder joint, or something other than a failed PA. 
 
Am I right thinking this???
 
I did switch out power cords, eliminating the fuse issue. My 50a PS is  
working fine, no drop in current or voltage at any time. All connections are

tight. 
 
I have googled the heck out of this. No joy...
 
Any thoughts? Having a hard time thinking its a bad PA. I guess it can be,  
but, conventional thinking says it either works, or not.
 
73- Chuck KI9A
----
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