So, I have this piece of equipment I've reverse engineered and intend to donate to a museum to go with some other items I've donated.
As much as I want to be able to hook up a scope or logic analyzer to the unit to get some more data before I deliver it to the museum curator, I haven't been able to do so as 120VAC is present throughout the unit, even on the DC ground, and even when the unit is switched off!
Needless to say, this is clearly a dangerous condition and I want to try and correct it with as little modification as possible. See below for the schematic of the transmitter stage:
I should be able to accomplish my goal by finding the connection between the -170V DC bus (D6 / D8 anode) and the DC ground from J2 and breaking it, right?
As much as I want to be able to hook up a scope or logic analyzer to the unit to get some more data before I deliver it to the museum curator, I haven't been able to do so as 120VAC is present throughout the unit, even on the DC ground, and even when the unit is switched off!
Needless to say, this is clearly a dangerous condition and I want to try and correct it with as little modification as possible. See below for the schematic of the transmitter stage:
I should be able to accomplish my goal by finding the connection between the -170V DC bus (D6 / D8 anode) and the DC ground from J2 and breaking it, right?
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