[ICOM] Re: Need Help w/PW-1 Problem

[Mac]

Tony,
My 53 week old PW-1 had the same exact symptom... Icom honored the warranty
even tho' it was a week over... it cost me $209 shipping, but they replaced
one final, a diode on the filter unit and a relay driver IC on the main
board...
I got it back, and while setting the ALC level, the PW-1 went poof.. Icom
suspects shipping damage, but who knows... it is trucking back across
America as I type..
But the point is at least one of your finals is probably toast. The parts
listed on my warranty invoice would have cost $150.00, and no labor hours
were listed. The invoice also warned me to set the ALC and never let it
deliver more than 1KW(which I had done properly BTW).  Mine was the first I
had seen with a problem after being on this list over a year.
73,
Mac, W8XF


-----Original Message-----
From: icom-bounces at mailman.qth.net
[mailto:icom-bounces at mailman.qth.net]On Behalf Of Anthony R Gargano N2SS
Sent: Sunday, July 04, 2004 1:06 AM
To: icom at mailman.qth.net
Subject: [ICOM] Re: Need Help w/PW-1 Problem


Harry, with regard to the ALC adjustment, just a few watts of drive makes
the amp kick out so it is not possible to make the adjustment.

Johnny, All the voltages seem to be there, so I think the PS is OK.

When the amp kicks out besides the AMP/PROTECT led turning red, the AUTO
led blinks. According to the instruction manual a blinking AUTO led fault
indicates the "power level of the 4 PA units becomes unbalanced". That
leads me to believe I may have lost one of the output devices. The RF
output stage is comprised of 4 boards, each with a pair of MRF150 devices
and the output of each board is fed into a combiner via an RCA plug. Any
PW-1 owners have experience in individually measuring the RF output of each
of the PA boards? If so, what did you use to do it with? Thanks, Tony N2SS

>Date: Sat, 03 Jul 2004 22:58:06 -0400
>To: icom at mailman.qth.net
>From: Anthony R Gargano N2SS <n2ss at n2ss.com>
>Subject: Need Help w/PW-1 Problem
>
>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


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