[ICOM] 756 Pro question

[Lawrence Young]

G/M Stephen. Glad you found the source of your problem. There is a procedure in the service manual for adjusting the bias for the PA stages. Before you replace the drivers, I suggest you read this procedure. Good luck.
Larry, Raleigh NC.

--- On Sat, 5/9/09, Stephen Budensiek <kzerosd at gmail.com> wrote:

From: Stephen Budensiek <kzerosd at gmail.com>
Subject: Re: [ICOM] 756 Pro question
To: "ICOM Reflector" <icom at mailman.qth.net>
Date: Saturday, May 9, 2009, 12:45 AM

Larry,
   Thank you.   Just saw your note, after finding one driver shorted
Collector to Base, and the other one is leaking real bad.  I'll have
to find a source for the NTE343.   You hit it right on the head.

73's de Stephen, K0SD in So FL

**************************

On Sat, May 9, 2009 at 12:11 AM, Lawrence Young <k4lxv at bellsouth.net>
wrote:
> 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
> ----
> Your Moderator: Dick Flanagan K7VC: icom-owner at mailman.qth.net
> Icom Users Net: Sundays, 1700Z, 14.316 MHz
> Icom FAQ: http://www.qsl.net/icom/
> To support QSL/QTH.net: http://www.qsl.net/donate.html
> ----
> Your Moderator: Dick Flanagan K7VC: icom-owner at mailman.qth.net
> Icom Users Net: Sundays, 1700Z, 14.316 MHz
> Icom FAQ: http://www.qsl.net/icom/
> To support QSL/QTH.net: http://www.qsl.net/donate.html
>
----
Your Moderator: Dick Flanagan K7VC: icom-owner at mailman.qth.net
Icom Users Net: Sundays, 1700Z, 14.316 MHz
Icom FAQ: http://www.qsl.net/icom/
To support QSL/QTH.net: http://www.qsl.net/donate.html