[ICOM] 756 Pro question

Lawrence Young k4lxv at bellsouth.net
Sat May 9 00:11:12 EDT 2009


Stephen: sounds like you have lost a 2SC1972 driver transistor in your PA. That is the most likely scenario with the pro series. They are no longer being manufactured, but the NTE 343 replacement replacement transistoris are about $15ea. If one is bad, I would suggest you replace both.
good Luck, Larry K4LXV.

--- On Fri, 5/8/09, Stephen Budensiek <kzerosd at gmail.com> wrote:

From: Stephen Budensiek <kzerosd at gmail.com>
Subject: [ICOM] 756 Pro question
To: "ICOM Reflector" <icom at mailman.qth.net>
Date: Friday, May 8, 2009, 9:29 PM

Hello all,
   I've had a 756 Pro for 10 years, it's worked flawlessly.   Turned
it on this morning, receive was OK, went to transmitt on 20m RTTY, and
could only get 10 watts out.   It worked OK last night, the antenna is
OK, even connected it to a Bird 500w Dry Dummy Load, 10w Forward, 0w
Reflected with power control fully clockwise.  Checked all bands, 6
through 80m, CW, SSB, RTTY.   Only about 5 amps of current increase
when I key.   Did a reset on it, no change.   Popped the covers off,
nothing smoked or visibly burned or bad.  PS is OK, connected another
radio to it, 100 w out OK, 25 amps (it's a 40 amp supply, metered).
Anyone have any ideals?   Little curious, it was OK last night, but
not this morning, no lightening, everything unplugged all night.
Maybe someone else has encountered something like this?

73's de Stephen, K0SD in So FL
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