Hi,
I've recently been doing some work on my R&B Pinball and need to take some voltage readings from various components on the playfield.
As we're working with DC current my understanding is that the black terminal should connect to the ground braid and then I can use the red probe to read voltages at the required points on the playfield.
Now, here's the strange thing.
When I do this I get very little in the way of readings. For example taking a reading on the relay board which controls the saw motor shows currents of < 1v.
However, if I move my black terminal to the ground point on the CPU board then I get correct readings (> 40v on the relay board).
I've checked continuity from the ground braid to the earth pin on the plug and it checks out.
Has anyone got any clues what's going on here?
Thanks in advance
Pete
I've recently been doing some work on my R&B Pinball and need to take some voltage readings from various components on the playfield.
As we're working with DC current my understanding is that the black terminal should connect to the ground braid and then I can use the red probe to read voltages at the required points on the playfield.
Now, here's the strange thing.
When I do this I get very little in the way of readings. For example taking a reading on the relay board which controls the saw motor shows currents of < 1v.
However, if I move my black terminal to the ground point on the CPU board then I get correct readings (> 40v on the relay board).
I've checked continuity from the ground braid to the earth pin on the plug and it checks out.
Has anyone got any clues what's going on here?
Thanks in advance
Pete