Superman541
Well-Known Member
View attachment 992872 View attachment 992873 View attachment 992874 View attachment 992875 View attachment 992876 View attachment 992869 View attachment 992791 View attachment 992792 View attachment 992793 View attachment 992794 Thanks to 'northpaw' for helping me in another thread. I have an Advent 300 that has zero output, certainly from the preamp. I want to use it as a preamp.
A power supply cap visibly needs replacing. Before I start ordering parts, I hope to learn more about why this unit is not working. I would like to at least check where there should be voltage. There is voltage at F-400 and F-401.
Line voltage is 121.7 VAC
Voltages from the power supply caps are +25.75 and -25.5. They should be +/-22. I suppose the higher line voltage probably causes that.
Here are pics from the schematic. I find various voltages (12-15-18 range) at some locations and not others. Where can I look for voltage that would help determine why this thing is dead?
As you can see, I am just learning about electronics. And before you ask, I know about capacitors and how to drain them. I am VERY careful. I have a good multimeter and various leads. I have used soldering pens. I am ignorant, but not stupid.
View attachment 992790 View attachment 992791 View attachment 992792 View attachment 992793 View attachment 992794
A power supply cap visibly needs replacing. Before I start ordering parts, I hope to learn more about why this unit is not working. I would like to at least check where there should be voltage. There is voltage at F-400 and F-401.
Line voltage is 121.7 VAC
Voltages from the power supply caps are +25.75 and -25.5. They should be +/-22. I suppose the higher line voltage probably causes that.
Here are pics from the schematic. I find various voltages (12-15-18 range) at some locations and not others. Where can I look for voltage that would help determine why this thing is dead?
As you can see, I am just learning about electronics. And before you ask, I know about capacitors and how to drain them. I am VERY careful. I have a good multimeter and various leads. I have used soldering pens. I am ignorant, but not stupid.
View attachment 992790 View attachment 992791 View attachment 992792 View attachment 992793 View attachment 992794
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