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Post by pinballrob on May 8, 2023 0:04:28 GMT
Looking for some help getting this thing spinning again.
I brought this back to life about a year ago. Took the gripper arm apart and thoroughly cleaned it. Everything was working great for about a year. Now I’m having issues.
The magazine won’t spin.
The gripper arm won’t move.
The turntable just spins.
I’ve checked all the fuses. All are good
I can hand turn the two motors and they move freely
I’m not getting any volts coming out of the control box (red connector) to the magazine?
Any other places I should be looking?
One other thing
I tested the voltage from the power supply.
All the windings are a little above spec except the 25volt is only 20v
I’m not sure if this has anything to do with the magazine. It doesn’t appear to go to the magazine
Thanks for any help
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Post by jukenorman on May 8, 2023 7:59:20 GMT
Hi Rob,
You've pretty much answered your own questions, you need DC volts!
Norman.
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Post by pinballrob on May 8, 2023 10:34:25 GMT
Are you saying the fix is to swap out the power supply? Where would I get one?
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Post by pinballrob on May 8, 2023 10:41:56 GMT
If the lower volts were the issue, wouldn’t I at least be getting some volts out of the red connector from the control box. I’m getting 0volts.
Could there be something else wrong?
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Post by jukenorman on May 8, 2023 14:42:29 GMT
No what I am saying is to fix the power supply! You haven't make clear whether the voltages you are referring to are AC or DC. What AC voltage are you measuring going into the bridge rectifier?
Norman.
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Post by pinballrob on May 8, 2023 15:32:30 GMT
There are 5 windings coming off the transformer. All are a little over the AC voltage. With the exception of the 25 volts AC. Measures around 20 V.A.C
But the 35 volt AC is the one that goes to the bridge rectifier. That one tests ok. I replaced the original Power Rectifier yesterday with a bridge rectifier. Didn’t fix the issue.
Which winding of the transformer powers the magazine motor? And the gripper arm motor?
My next place to look is the rectifier in the counter unit? I’m just thinking those are parts that fail.
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Post by jukenorman on May 8, 2023 15:53:29 GMT
These motors are both DC so if you you have the 35VAC and you've replaced the rectifier, then you should have the DC voltage. The DC is split via two fuses. If my memory serves me correctly one feed is for the write-in circuits and the other for the read-out circuits. Do you have a manual or the schematic that you can use to fualt find? Are you getting DC at the output of the rectifier at the fuses?
Norman.
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Post by pinballrob on May 8, 2023 16:24:30 GMT
I have a manual. I’m a rookie at repairing jukes and reading schematics. This is my only one. Better at pinball repair. But I’m determined to get spinning again.
What DC voltage should I be seeing after the rectifier?
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Post by jukenorman on May 8, 2023 16:41:37 GMT
With no load, you'll be looking at close to 50VDC. That would drop considerably when motors etc are operating.
Norman.
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Post by shrimpeater on May 11, 2023 23:59:52 GMT
Have you checked your cam switches. I think it's the number 2 switch that needs to be in the cam groove when gripper arm is in the rest position
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Post by pinballrob on May 19, 2023 16:53:15 GMT
Still struggling with this
I’m getting 13.3DCV after the bridge rectifier. (37.7 ACV) going in
What/where are the cam switches?
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Post by jukenorman on May 20, 2023 8:57:27 GMT
Hi Rob,
13VDC is obviously not enough, what do you measure there if you disconnect the outgoing plugs ie no load at all? That would show whether the problem is within the power supply or external. You could then maybe connect them individually to see where the problem is, depending on the result.
Norman.
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Post by shrimpeater on May 21, 2023 2:15:27 GMT
The cam is located opposite of the gripper motor end. Motor on one end,cam and switches at other end just beyond the tonearm control.
It's sounds more like a power problem. I would get a manuel/schematic and pull the power supply and bench test it,and go from there.
Good luck
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Post by pinballrob on May 26, 2023 12:34:48 GMT
I pulled the control box and did some testing.
The 680 ohm resistor for the gripper relay is dead.
What watt resistor should I get for replacement?
Thanks
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Post by jukenorman on May 26, 2023 15:41:21 GMT
Do you mean the play control relay? In which case it's a 5W resistor. When you say "dead", do you mean open circuit - the reason I ask is because I wouldn't see that resistor open circuit being the cause of your problem. However if it was close to a short circuit, then yes.
Norman.
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