[time-nuts] Austron/ Systrom Donner 8181 Time Code Reader

Dave Wood w4ej15 at gmail.com
Sun Apr 23 14:31:15 EDT 2017

Bill, actually what happened is the zener diode that the resistor fed
shorted and that's the reason it burned up.  I have two units with this
issue and I cannot read the resistor value since it burned up.  What I
would love to know is what the original value of the dropping resistor
was?  73  Dave

On Sat, Apr 22, 2017 at 11:39 PM, Bill Hawkins <bill.iaxs at pobox.com> wrote:

> There is usually a power dissipation reason why a resistor becomes
> toast, and the reason is frequently a shorted bypass cap or a shorted
> device.
> Have you measured the resistance to ground of the end of the resistor
> opposite the power supply?
> Sometimes inputs get high voltages and short the amplifying device.
> Sometimes that is reason the units were for sale.
> Hope I'm wrong.
> Bill Hawkins
> -----Original Message-----
> From: time-nuts [mailto:time-nuts-bounces at febo.com] On Behalf Of Dave
> Wood
> Sent: Saturday, April 22, 2017 8:43 PM
> Anyone on the list own the above Time Code Readesr.  I have one of each,
> they are identical with the same issue.  I need to identify the correct
> value of a resistor in the power supply that provides 27 volts to the
> input amp.  They are both toast in my units and I do not have a manual.
> Thanks in advance!  Dave _______________________________________________
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