435 princess power issue repaired new problems.

[jukenorman]

Yes the ground should go to the bridge recifier at the positive side. The DC voltage from a silicon bridge recifier will be a bit higher than a selenium rectifier, this is not usually an issue. The measuremets you are taking are with no load connected so will be higher because of that.

Norman.

[Ron Rich]

Pete,
3rd time I've axked--- IS, or IS NOT, that one diode jumpered from one leg to the other with a black wire ? Ron Rich

[prime]

I answered it earlier no, the white/red wire is going to the positive positive legs of the diodes, the two black wires are going to the negative negative legs of the diodes, the two transformer wires are going to the positive negative sides of the diodes. If this is incorrect let me know please pete the black wire you see that seems to be jumping the diode is underneath, it just looks like it connects that way.

[prime]

Hi Norman i will switch the wires

[jukenorman]

Pete, that is a very confusing answer that you have given Ron! You should only really have four wires connected to the bridge you made up and the black wire should only be connected at one point. You shouldn't have a black wire connected at the same point as the red wire - it looks like Ron's suspicion was correct!

Norman.

[prime]

Im adding another photo, i think you guys cant see it properly.. But i do have one issue if i reverse the wht-red with the two blacks, one of the blacks are going to the chassis, will this not short out everything??? After reading your answer Norman, i get the impression there should be only one black wire, on the green rectifier that i removed there were two, one going to the switch, one going to a ground lug, should i remove the one going to the ground lug before i reverse the wht-red and black

[prime]

This is the original rectifier installed, as you can see there are two black wires, one going to chassis. pete

[jukenorman]

One black wire on the old rectifier is going to the chassis - that provides the ground for the -28V. The other black wire that's connected there is providing a convenient ground for something else. That second black wire could easily have been connected to the chassis (or any other ground point), it has no bearing on the -28V operation. If you're going to connect these two wires to your new rectifier, they must be connected together to the same point. So essentially four wires connected to the new rectifier and one other to provide a convenient ground connection to "the switch". Do you understand?

Norman.

[prime]

That is what i have ,four wire connections, just the negative connection has 2 wires because one is going to switch. No to be clear you want me to switch the wht-red wire with the blacks to reverce everything. pete

[jukenorman]

Yes Pete, swap the Wht-Red and the Blacks and then check that you have negative voltage at the Wht-Red wrt ground (Black).

Norman.

[prime]

OK swapped wht-red and black red probe on wht-red wire ,black probe on chassis , -42vdc. Hi Norm or Ron can it use electrical tape to cover all of the diodes so at no time in the future can it short through movement, i was informed that this type of a rectifier does not get as hot, maybe this is bad info. thanks pete

[prime]

Hi Ron and Norman, like always thank you for all of your time and patience, I reinstalled power supply, basket and gripper motor now spin in the right direction. Tried a few records, read out needed adjustment but its perfect now. I dont know about sound because the needle came broken and see someone has been in the amp. I will recapp and check all joints before i try sound. Again thanks pete