435 princess power issue repaired new problems.

[prime]

Thanks guys, as far as the gripper motor, i know you wont like this but if i manually turn the motor to start removing the record then restart the unit, the gripper motor moves it back to the basket and stops. I feel that proves the motor works. I will look at the reverse relay, i had noticed when selecting the record and the write in process starts ,i see the play relay move, i see the light flash on for a millisecond moving the reverse relay , but no other movement after basket starts and stops.  

[prime]

Ok starting unit at stand by, using number selectors for A7, write in pushes A7, read out turns to A7 stops, at this time i disconnected the connector to the gripper motor, on the power side of connector i get 2.4 vac at top pin .07 at bottom pin, im not sure if i would get any voltage if relay didnt work. Does this help confirm reverse relay is the issue or wire broken maybe in power supply ?

[prime]

I removed the power supply, tested all the blades (contact,pins) on the play switch, reverse relay and the switch inside the power supply, i have excellent continuity on all blade (contacts) i found no wires loose or broken. The only change i have made is restoring power with a new rectifier, i see the ground for the switch array under the power supply use to go to the second pin of the old rectifier, a second ground came from the bottom of the chassis going to the same pin. The old rectifier was bolted to the casing. I am not bolted to anything now but I dont see why i would need to be.

[Ron Rich]

Hi Pete,
What (how) are you checking continuity, with ? Ron Rich

[prime]

I use my analog meter, i set it on HFE, i use one probe on each side of the wires going to the blades i am testing, i close the blades and watch the needle, if it sinks completely to the right i know it is a strong contact. pete

[prime]

I just got power to the gripper motor,     two problems using my automatic digital fluke i get 16.4 vac at pins that connect to gripper motor wire, I think i should get 25vac, secondly i see the main issue is the gripper motor is running in the wrong direction and is at its limit. When facing the front of the jukebox and watching the small drive wheel on the motor, it needs to go right to pick up the record and place it on the turntable, instead it is going to the left and is jamming.

[Ron Rich]

Pete,
What is the "HFE" setting-- and you are not looking for 25 VAC, you should be looking for RECTIFIED, 25 volts-- motor runs on 25 VDC , which controls the motor's direction. Ron Rich

[prime]

HFE is the analog setting for OHM resistance. a full needle to the right is a complete or dead short, this was just to check blades(switches). I was checking the AC voltage at the connector to the gripper motor ,as usual you are correct, i forgot it was now VDC. When power goes to the motor it reads 32VDC. My issue was not power but direction, i didn't realize the gripper motor was getting power all along but was moving in the wrong direction, it was heating and it was stuck. Im not sure why it hasnt changed direction. 

[jukenorman]

Hi Pete,
The Rock-Ola power supply diagram is not strictly correct - the diodes in the bridge rectifier are shown the wrong way round. Most people probably wouldn't notice because they would use a composite rectifier where the connections are marked ~, + and -. The + and - on the rectifier as shown on the schematic are correct. So you need to swap around the Wht-Red and Black wires so that -28V is on the Wht-Red. Check the voltage first but I'm certain that you will have +28V relative to ground.

Norman.

[prime]

I was wondering if the rectifier was the issue, it was the only thing i changed. When testing what should i see now at the wht-red and at the black, If i read this right i want -28v connected to the wht-red and whatever is coming off the positive side of the rectifier connected to the black.

[jukenorman]

Yes Pete, the positive connection of the bridge rectifier to ground and you should read -28V at the Wht-Red relative to ground. Didn't the record basket also rotate the wrong way?

Norman

[prime]

Hi Norman, i removed the power supply from the unit, i put it on my bench, using red probe on wht-red and black probe on chassis i read 42vdc ,putting red probe on black wires connected to rectifier as it is and black probe to chassis i get 0 vdc. After some thought i think the basket may have been going the wrong way. Just to add black probe on wht-red and red probe to chassis -42vdc

[prime]

Sorry to go on ,in the old green rectifier there were two ground wires connected together, one goes to the switch that's inside the power supply, the other goes to a lug and meets more ground wires then to other ground lugs. Just confirming this ground should still go to my rectifier.

[Ron Rich]

Good morning All.
Pete--
Thanks for the HFE explanation-- I am not familiar with that at all---- Looking at the photo of your 4 diodes, it looks like there is a black wire soldered between the 2 legs of the diode, on the upper right ? If so, that's wrong, as it just removes that diode from the circuit ?
Ron Rich

[prime]

I tested the transformer 38 vac