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

[Massimo 'Max' MUCCI - I8NHJ]

Ciao Anthony
Yes, I had got the same problem here. At the end of the
story the combiner unit was faulty.
----------------------

73 de Max, I8NHJ/NH7CU
one of EL2PP, 1A0KM, JT1Y, E30GA, T77V, TT8MM, T32R, K5K, XR0X, S05X

on domenica 4 luglio 2004 you wrote:

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

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

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