Re: Datsun clock repair


"Honest John" <honestjohn@xxxxxxxxxxxxxx> wrote in message
news:VYmdnbZhTbq0o1DeRVn-iA@xxxxxxxxxxxxxxxxx
>
>
> There's usually a reason that the resistor fried in the first place.
> Burned
> resistors mean to me the circuit is drawing too much current, >
> H.J. ( electronic tech for 15 yrs )
>
>

The resistor burned because the diode shorted. I've removed all components
to test them out of circuit. The diode is as short as a length of copper
wire! It overheated and the glass envelope was cracked. I was amazed that
the diode came out intact. Usually, when I removed a blown diode, the glass
crumbles when I unsolder it, and almost always when using needle nose pliers
to remove it.

I'm going to try substituting a 2n2222 NPN transistor and a 1N914 diode in
the circuit. I've got a small resistor sub box to try to dial one in that
will work.

Bob



.

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