[ICOM] Need Help w/PW-1 Problem

[Anthony R Gargano N2SS]

I have an early serial number, 1138, PW-1. The amp has worked fine up until 
now. This evening I started to get an "Amp/Protect" fault on every band - 
160 thru 6 meters. I have connected the amp to a dummy load, done a CPU 
reset and a reinitialization - all to no avail.

I drive the amp with a 756 PROII and have been using this particular 
combination for several years. If I reduce the drive to minimum (RF Power 
control fully CCW), the amp keys and does not fault but as soon as I begin 
to increase the drive, it kicks out and the Amp Protect led turns from 
green to red. The 45V HV line to the PA stages is fine. I would really 
appreciate any thoughts or suggestions. Thanks, Tony N2SS