> -----Original Message----- > From: cctalk [mailto:cctalk-boun...@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@classiccmp.org> > Subject: Re: What Is This Component? > > > > On 23 Jul 2017, at 23:05, Rob Jarratt via cctalk > > <cctalk@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! Thanks Rob
