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Old 16th Oct 2020, 4:20 pm   #6
RogerEvans
Pentode
 
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,

Roger
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