Thanks to Mike, Jerry and of course Garland Jenkins at Ten Tec I fixed
my Model 280 supply with 2 used J802 pass transistors I had on hand.
Everyone's contribution is much appreciated. The J802 is a cross to the
original 2N5301's. Thanks for the help guys and as for Garland; what a
customer service rep for Ten Tec.
73,
Jeff
----- Original Message -----
From: "Mike Hyder -N4NT-" <N4NT_Mike.Hyder@charter.net>
To: <tentec@contesting.com>
Sent: Tuesday, April 22, 2003 3:53 AM
Subject: Re: [TenTec] Omni C - No TX
> Jerry, the trouble wouldn't be with the current protection, but is
probably
> with the crowbar (overvoltage protection) that is blowing the fuse. One
of
> the pass transistors may be shorted, putting too much voltage across the
> output. The crowbar clamps it down and blows the fuse when this happens.
>
> 73, Mike N4NT
>
> ----- Original Message -----
> From: "Jeff Stewart" <stewgoat@indy.net>
> To: <tentec@contesting.com>
> Sent: Tuesday, April 22, 2003 2:00 AM
> Subject: Re: [TenTec] Omni C - No TX
>
>
> > Thanks to Jerry I found the 20 amp fuse in the supply blown but the
> > replacement fuse blew also. Unhooked the supply from the rig and
jumpered
> > the switch lead that goes from the supply normally to the radio and the
> fuse
> > still blows without the radio attached. Now I could use the schematic
for
> > the supply to figure out how the current protection works. At least I
> have
> > it narrowed to the supply and not the radio at fault for the blown fuse.
> >
> > Jeff
> > ----- Original Message -----
> > From: "JERRY JUDY" <ke8npjmj@ameritech.net>
> > To: <tentec@contesting.com>
> > Sent: Monday, April 21, 2003 9:45 AM
> > Subject: Re: [TenTec] Omni C - No TX
> >
> >
> > > Inside the ps is a 20 amp fuse on the ps circuit board. I would bet
that
> > > fuse is blown. This condition lets the recieve work but high current
of
> > > xmit is gone. Let me know if I am right? KE8NP
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > > ----- Original Message -----
> > > From: "Jeff Stewart" <stewgoat@indy.net>
> > > To: <tentec@contesting.com>
> > > Sent: Sunday, April 20, 2003 10:36 PM
> > > Subject: [TenTec] Omni C - No TX
> > >
> > >
> > > While adjusting my MFJ antenna tuner, my Omni C kicked out of
> transmit
> > > (too high an SWR I assume). In the past, just shutting the rig down
> then
> > > powering up would reset it. Now every time I key the mic or use the
> lock
> > > position, it shuts down but will return to receive when unkeyed. The
> Omni
> > > and the 280 power supply both turn off on transmit but works fine in
> > > receive. Both the fuse on the power supply and the radio check fine
> with
> > an
> > > ohm meter. What have I blown? ( I do have the owner's manual but I
> > there's
> > > no troubleshooting section.
> > >
> > > Thanks,
> > > Jeff
>
> _______________________________________________
> TenTec mailing list
> TenTec@contesting.com
> http://lists.contesting.com/mailman/listinfo/tentec
|