TAS455 TAS465 SMPS 119-5024-00 (Astec AA18020) repair

Jon Harrison-Hughes

Hi everyone,

I'm trying to save this 'scope from landfill after a previous owner connected it to 230V with the power supply switched to 110V ! It's the earlier model (pre S/N B020099) with the switchable Astec AA18020 power supply. I have two initial requests

1) C5 and C6 , VDR1 and VDR2 have been removed. Please could someone tell me what was originally fitted in these positions.
2) Does anyone have a schematic for this power supply ? It's omitted from the Tek 070-8524-02 service manual.

Many thanks,


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