Hi Roger,
Thanks for all the ideas. I am a bit careful with voltages over 1 KV, but in the past, when I was still at school, I caught a belt at 2 KV on a homebrew scope that I was trying to build. This was from a mains-transformer supply with a voltage doubler and so was low-impedance and capable of quite a whack. It came about from a leaky capacitor which was supposed to be keeping the X-modulation input safe. More fool me!
With regard to the 7623A, I think I mentioned that I had checked all of the voltages from the low-voltage DC supply and found that they were all in spec. I might also have mentioned that I could see the sweep output on the BNC at the back of the scope, so a good few voltages are obviously ok.
I suppose I should gird my loins and try to gain safe access to the high-voltage board and that heat-sunk transistor Q1195.
Colin.
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-----Original Message-----
From:
[email protected] [mailto:
[email protected]] On Behalf Of Roger Evans via groups.io
Sent: 23 September 2020 11:13
To:
[email protected]Subject: Re: [TekScopes] 7623A Storage problem
Apologies - I skipped the very important 'check all the low voltage DC supplies', there are so many inter-dependencies in these scopes.
Roger
