Rock-ola 477 Max Turntable Motor AC or DC ?

[stepdey]

Hi there, I now have a problem with my turntable which is now not "spinning" .

The selected record gets placed on the turntable by the gripper arm, the tone arm then places the needle correctly at the start of the record, and the needle is "live". BUT the platter isn't turning.

My problem is, that after searching for a solution on this, I am confused as to what I need to set my mulitimeter to, so I can check the motor wiring connections, is it AC or DC voltage ?  there seems to be some debate as to which it actually is.

Thank you

Stephen

[Ron Rich]

Hi Stephen,
Why is there a "debate" ? What does the schematic say ? (follow the wires back, from the motor to the power source) Ron Rich

[stepdey]

Hi Ron,
After browsing different sites some posters are of the opinion that the motor is DC others say AC, thats what confused me mate.

Have since found a label on the rear of the motor saying its 117v 50Hz so obviously AC. So I now know to set multimeter for AC

In regards to the schematics I cannot find any page where the turntable motor is shown, I've got a CD, I can clearly see both the gripper and carousal motors identified on several pages,
but must admit that not all pages are clearly reprinted from the originals on the copy I've got. A poster sized one would be a great help no doubt.

Anyway I shall do as you say and follow the wire back to their source
Thank you

Stephen

[Ron Rich]

Hi Stephen,
This is why I keep "harping" "--BUY GOOD copies, of Service Manuals, from the sellers listed in our FAQ's section" ! Ron Rich

[stepdey]

Point taken Ron !

Anyway, success
1. Fuses checked (all ok)
2. Logic Board cleaned all pins on connections, tested, still no spin
3. Play Relay cleaned all the contacts. tested, now working ok

Just happy/lucky that it wasn't anything_serious that required an engineers visit at the end of the day, especially knowing that the fault was not down to something I'd done !

Regards
Stephen

[jukenorman]

Hi Stephen,
The original manual came with a large fold-out schematic which would show the turntable. I was also going to say that I thought it was fed via the play control relay but you have discovered that!

Norman.

[Ron Rich]

Hi Stephen,
Yes-- It was "something(you) did--" YOU, no one else, shorted the 25 vac to ground--thus causing an un-due amount of current to be drawn through the relay contact(s?), which resulted, obviously, in a contact failure. But you also have now "un-done" it ! Hopefully you have followed the cleaning proceedure in our FAQ's section,or you will probably need to do it again, and again till it's correct --- Ron Rich

[stepdey]

Thanks for that Norman, theres one for sale here in the UK at the moment, only wants £15, will have to get it.

Strange thing is Ron, last played juke ok on Wednesday, had ordered a record which the wife wanted on the juke, placed in it magazine Saturday, said to wife, come here I've got a surprise for you, selected the record - nothing, opened lid to find the record on the turntable with needle positioned correctly at beginning of record, but not spinning, yeah I had a surprise for myself ! lol

So the only thing I did was move the magazine switch from operate to scan, change a record, move switch back to operate, as I said strange.

Stephen

[jukenorman]

Hi Stephen,
I would recommend that you check that the manual actually includes the large schematic before buying!

Norman.

[Ron Rich]

Hi Norman,
Absolutely--Egg-zact-ley whut it says to do in our FAQ's post !!

[Ron Rich]

Hi Stephen,
When was the last time both felt wicks on that motor was properly oiled -- with the correct oil ?? Did you lift up on the TurnTable (TT) to determine if the motor, was, or was not, turning ? When was the last time the idler wheel was cleaned with either al-kee-haul , or a safety solvent, bearing-slide oiled-- the inside of the TT housing, cleaned- the TT bearings properly oiled ?? Ron Rich

[stepdey]

Norman, already got the manual on CD, but some of the schematics are faintly reproduced, thats the problem, anyway have just bought the poster size you refer to mate.

Ron, I very recently bought the juke fully serviced and working from a jukebox dealer ( Justjukin )
I could see that the gripper spider and shaft etc had been freshly oiled and moved freely, likewise all the gears had been greased.
I don't however know if he'done anything to the turntable motor ( I did check both of the other motors to see if there was any play, both appeared ok, no sloppy play )

In repect of the turntable, yes that was the first thing I did, lift it, I have also cleaned the idler wheel and inside of turntable with isopropyl.

I do watch "Ron on Joe's Classic Video Games" a lot repairing Rock-olas etc, thats where I have got a lot of info from watching him first hand. He has also mentioned you and the books you have written.

Stephen

[Ron Rich]

Hi Stephen,
I have never watched him-give us a link---
Thanks, Ron Rich

[stepdey]

Hi Ron.
No problem mate, forgot to say on You Tube,

First time I've come across him doing a Seeburg ( DS-160 ) www.youtube.com/watch?v=nth-ldszJfM&t=5s

After watching several of his pintable repairs in particular, I'm really impressed with his understanding of schematics.

Stephen

[Ron Rich]

Hi Stephen,
I'm sorry-- in the first 10 minutes he miss-stated at least 10 things ! I could not take any more--
Thanks,
Ron Rich