Tek 453A-1

quadzillatech@...
 

Hi all,ive the above scope,i brought it as faulty with no trace,after some poking around i found a couple of transistors dead on the z axis board along with a few resistors out of spec due to age,i now have a trace but cant adjust the high voltage to - 1950v,the most i get is -1093,the hv adjustment pot R900 makes no difference to the voltage whatsoever ive renewed the door knob on the eht comp but no change,the cal is all to pot due to the low hv,any ideas where to look and what to check?,ive checked all the electrolytics for high esr,they all test good,cheers m3vuv 73.

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