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Old 16th Oct 2020, 4:20 pm   #6
Join Date: Oct 2014
Location: Wiltshire, UK.
Posts: 237
Default Re: Tektronix 7623A poser

The 'collector' test point on the storage board is powered by the +600V supply to the storage board, dropped to +160V on the Zener VR1831. The +600V comes from a winding on T1199 which is the source of all the high voltages for the CRT. So if you have lost the -1475V and the fuse to the driver transistor keeps blowing then you will lose the +600V to the storage board as well.

I have been quiet over on Tekscopes simply because I have never stripped down the boards that Colin needs to get at and I know how awkward the access can be around the power supplies.

Sounds like Colin has some proper advice now.

Best of luck with the repair,

RogerEvans is offline   Reply With Quote