HW-101 trouble shooting (IT"S FIXED!!)

[Jim Temple]

Hello to the group,

Thanks to Dave, Brad, and Ed, (you know who you are) the HW-101 is back.

All suggested looking at C423 as well as a couple of other parts.  I had
previously tested those parts on my cap tester, and the parts tested good,
so I was at a loss as to where to to from there.  It appears that components
will test good and still be bad in some suttle respects.

So to correct the problem of R405 smoking when tuning up, I shotgunned the
direct replacement of R405, C423, R401, C403, and C406.  (I didn't want to
do it one at a time and if it didn't work, have to disassemble, replace, and
assemble again for each part.)  Most likely C423 was the culpret, but if
not, certainly one of the others.  There you have it.

Thanks again to Dave, Brad, and Ed and the group.

Sincerely,

Jim
73, KF4ICZ

----- Original Message -----
From: "Dave Larson" <dalarson at ISPCHANNEL.COM>
To: <HEATH at LISTSERV.TEMPE.GOV>
Sent: Sunday, January 21, 2001 1:55 PM
Subject: Re: HW-101 trouble shooting


> Hi Jim.  You might want to take a look at c423. According to the schematic
> it is connected to pin 3 of the 6CL6 (looks like pins 3 and 8 are
connected
> to the screen grid). C423 may be shorted but with 6CL6 pulled from socket
it
> wouldn't smoke screen resistor.  You may also may want to take a look at
> C403.  If it is leaky, it could bias the 6CL6 on too much. You could also
> lift on side of C403 and see if it is a DC problem or if RF drive is
causing
> it to burn up.
> Good luck Jim.
>
> Dave WB0TSR
>
> At 01:10 PM 1/21/01 -0500, you wrote:
> >Hello to the list,
> >
> >I have a HW-101 that I have come to the end of my rope on. The receiver
> >works great.  The transmit relays work fine.  When tuning up R405 smokes.
> >
> >R405 on the RF board smokes when the mode switch is placed in "tune".  I
> >have traced the wiring that seems to have a connection.  I have checked
the
> >components that seem to have a connection.  I have removed the 6146's and
it
> >still smokes.  I have removed the 6CL6 driver and there is no smoke.  If
I
> >replace the 6CL6 with a known good driver, it again smokes.
> >
> >I am missing something somewhere, but I do not know where the possible
> >problem can be.
> >
> >Perhaps someone on the list can look at their schematic and let me know a
> >few possible areas to check, or specific parts to check that would
> >contribute to damaging R405.  Perhaps someone has had this same problem
and
> >would pass on to me their fix.  Thanks for any and all assistance that
will
> >help with my problem.
> >
> >Sincerely,
> >
> >Jim
> >73, KF4ICZ
> >
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