What you seem to be saying is that the main power supply works fine when the coax inputs to T2010 are
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not connected, but when you connect them the main supply goes into tick mode?
Is that correct?
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of ef804s tubes
Sent: 15 October 2018 15:55
Subject: [TekScopes] 7834 High Voltage Board
recently I acquired a non-functional 7834. After finding a bad tantalum on the +15V on the readout
board and an open zener in the -50V supply, I was very happy that the supply came up and there was
no obvious short in the high voltage section. But, no high voltage was present. After opening the
I saw, somebody had disconnected the two coax connectors supplying the AC voltage. After
reconnecting, the power supply did not come up. I disconnected the secondaries of the high voltage
25Khz transformer but the symptom remained, so to me it looks like a shorted transformer.
Therefore, I need a new high voltage board or transformer. If you agree with my diagnosis, could you
please help to locate a high voltage board.