It's a "watch" quartz crystal... http://www.explainthatstuff.com/quartzclockwatch.html
probably used to set the master frequency for the UART/Serial interfaces... Dave > -----Original Message----- > From: cctalk [mailto:[email protected]] On Behalf Of Rob Jarratt > via cctalk > Sent: 23 July 2017 23:05 > To: General Discussion: On-Topic and Off-Topic Posts > <[email protected]> > Subject: What Is This Component? > > 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 QZ1 in the following picture: > https://rjarratt.files.wordpress.com/2017/07/wp_20170723_22_38_20_pro.j > pg > > > > The U56 component in the picture is what QZ1 is connected to (pins 5 and 6), > on the reverse side of the board the pins are also connected to a resistor and > a capacitor. > > > > If anyone can tell me what QZ1 is I would be grateful, and if there is a modern > equivalent, that would also be good to know. > > > > Thanks > > > > Rob
