What Is This Component?

Rob Jarratt robert.jarratt at ntlworld.com
Sun Jul 23 17:23:58 CDT 2017

> -----Original Message-----
> From: cctalk [mailto:cctalk-bounces at classiccmp.org] On Behalf Of Adrian
> Graham via cctalk
> Sent: 23 July 2017 23:11
> To: General Discussion: On-Topic and Off-Topic Posts <cctalk at classiccmp.org>
> Subject: Re: What Is This Component?
> > On 23 Jul 2017, at 23:05, Rob Jarratt via cctalk
> > <cctalk at classiccmp.org> wrote I am trying to repair my DECstation 220
> > after a battery leak, and making some reasonable progress. I have
> > reached a component that is unknown to me, so I don't know how it is
> > supposed to behave. It is connected to the inputs of a CMOS NAND gate,
> > where I measure a steady voltage of 1.8V, but the output of the gate
> > is oscillating, which suggests to me that the gate can't decide what
> > the input is. So perhaps this mystery component could be to blame. The
> > marking on it is "KDS0B" (the zero could be an "oh", I am not sure). I
> > have a spare board with the same component where there is a marking of
> "32768". Some searches suggest it might be an oscillator.
> >
> It is, it’s a 32.768kHz oscillator for an RTC. I’ve got a few brand new ones in
> front of me as replacements for the battery-damaged crystal in the Executel
> I’m trying to resurrect.

Thanks for that. I checked it again and realised that it *is* oscillating. I was sure that I had checked for a signal before, but I must have done something wrong and managed to miss it. I suppose knowing what it is supposed to do helps!



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