Yeah. The relay and cap on the load side of R2 test good, and other circuitry
on the source side is healthy. The failed R2 still has piecemarking legible:
HE19316, RT-25, 20 ohms. Don't recognize the HE19316 (mfg ?). It's looking like
the failure was one of a latent fault in R2 itself. Got a 50W 20 ohm
chassis-mounted resistor on order from mouser.
Also going to redesign/reconfigure the HV filter cap "nest" and it's mounting
hardware that secures nest to the chassis botom plate. Original mounting of
that nest involves stacking two thin (0.060) acrylic sheets separated by 5 thru
bushings, separated from the chassis bottom by 5 thru bushings, and all of that
stuff "secured" to the chassis bottom by five 1-1/2" 4-40
screws/nuts/washers....all of that stuff "floating", non-captive. Removal of
that nest is necessary to gain access to/removal of the 81212 rectifier board.
It'll go back together configured a whole lot more "assembly-friendly". If
anyone is interested in the redesigned nest, let me know off-line, and when
it's done I'll provide the details.
73,
Allen--W7GIF
----- Original Message -----
From: Stuart Rohre<mailto:Rohre@arlut.utexas.edu>
To: tentec@contesting.com<mailto:tentec@contesting.com>
Sent: Monday, January 29, 2018 3:40 PM
Subject: Re: [TenTec] Titan 425 power supply woes
sounds like the R2 failure was a current limiting resistor, to not
apply a big surge to the associated rectifier.
Stuart Rohre
K5KVH
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