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.jpg 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
