Rockola 460 readout not working

[jski]

This is my first thread, i have a rockola 460, the A side quit working awhile ago, now the B side quit working, it appears to be writeing in because the pin is moveing, but when the readout arm passes over the pin i can see a small spark and it just keeps spinning, would it be the coils on the arm ? and if so how can i test them ? i do have another complete box so i have parts, are the coils on the writein the same as the readout ? any help appreciated, thank you,,, jski,,,

[shrimpeater]

I would check,clean the area that makes contact with the pin.
Clean contacts and track the read out rides on.
This assembly can be removed fairly easy for service and cleaning.Coils can be checked for continuity.Inspect wire connections
A manuel with troubleshooting will come in handy.

[jski]

I have tried everything possable with the readout arm, includeing changeing the coils ,its doing the same as before, the readout arm just keeps turning, now im curious if it could be a micro switch   The manual ,page 45, sequence #14(carriage trips interlock relay) where is the interlock relay located , sequence states, When the mechanism has completed conditions for the physical transfer of the correct selection to the turntable,... The striking of the selector lever by the readout carriage contact completes a circuit to the interlock trip coil,,, i dont know where the trip coil is located, any help would be appreciated, im ready to travel 125 miles to the nearest repair shop,, if anyone can help, please e-mail me ,,,,thank you,,,,,

[shrimpeater]

Make sure you have plenty of push on the contacts and that they are clean. You may want to remove that assembly.It only has 1 bolt holding it on.That way you can clean the tracks and ccontacts on arm real good,and make sure there is plenty (but not too much) pressure on contacts on track.
You can use a volt meter on track and contact to make sure you have good conections

[jukeboxmarty]

Oct 7, 2023 16:38:05 GMT shrimpeater said:

Make sure you have plenty of push on the contacts and that they are clean. You may want to remove that assembly.It only has 1 bolt holding it on.That way you can clean the tracks and ccontacts on arm real good,and make sure there is plenty (but not too much) pressure on contacts on track.
You can use a volt meter on track and contact to make sure you have good conections

Agreed.

I've had some machines where the contacts on the fingers were so corroded I needed to use a burnishing tool to get them to conduct.

[jski]

I have had the readout arm off ,cleaned Everything, changed coils,changed AB switch,changed all 4 micro switches, reset plug connectors, and changed control box located under turntable,trid different relays (red),changed play relay,cleaned pins,The only thing i haven't done is get a new jukebox,readout arm is still turning,,,,tomorrow im going to switch out the Pin disc,,,

[jski]

I switched the pin disc, i cleaned everything, contacts and put a slight bend on the contact arms, still keeps turning, anybody have any thoughts on this, when the arm strikes the pin,where can i check to see if it is sending the power to the right place,,,? Control Box , thank you,,,

[jukenorman]

Look at the manual - page 44, sequence 14, "carriage trips interlock relay" to fault find what is wrong. I'm not sure that the random changing out of various parts is the key to logical fault finding!

Norman.

[jski]

Thank you for your input norman, i can use all the help i can get, your probally correct on the random changeing out of parts not being logical,but im new at this,ive referanced sequence 14, i changed the control box that houses the interlock relay but it has'nt made a difference, im takeing apart all plugs and cleaning them and resetting them,im not really sure on how to test the interlock relay, i know it should operate when the readout arm hits the pin, i checked each readout contact to each ring on the disc and have continuity on each of them,so it should be sending power to the relay,can i use a multimeter to check that ?

[jukenorman]

Can you identify the "interlok trip coil"? If so, turn your jukebox off with the carriage contact block above a selector pin in the selected position. In that position you should read 60 ohms from one side of interlok trip relay coil to ground (the other side will read more because of the resistance of the coil, but measure that as well). The other side of the interlok trip coil (not the 60 ohms side) should read 0 ohms to the 33VDC rail which you can find at the common of #2 micro switch (red/blue wires). Refer to the schem-a-gram on page 44. Report back with your findings.

Norman.

[jski]

Ok Norman,i know where the interlock trip coil is in the control box underneath the turntable, i just purchased a multi meter, yesterday, i set the readout on a pin and checked it to the big wire connector coming off the pin disc,i then followed it to the AB switch where it also had continuity, so i guess it is sending a signal from the readout arm pin contact to the AB switch, i will check #2 micro and trip coil as you described, and as always THANK YOU VERY MUCH for takeing the time to help me,,,,, jim

[jski]

Hey norman, sorry i hav'nt got back to you, wife has medical issues, mama comes 1st, anyway one thing happening that could mean something is i noticed the numbers flashing after you make a selection, will not stop,like if you play 176, the numbers will move untill they stop on 1, then 7, and finally 6, they just keep flashing over and over, i will check that Interlock trip coil tomorrow,,, thanks, jim m.

[jski]

Hey norman, sorry i havent got back, the problem is definately in the trip coil area, i really dont know how to use a multi meter but when i engage the trip coil it stops the carriage and places the record on the turntable, it appears to be playing A and B sides, so what wires send the juice to the trip coil to play the record ?? or what should i try,,,as always, thank you for your patience and help, i must say i am learning alot, at least the basics,,,

[jukenorman]

Hi Jim,
All I can really suggest is you refer to something like learn.sparkfun.com/tutorials/how-to-use-a-multimeter/all and learn the basics of the multimeter. My previous post had instructions for some basic fault finding and we haven't really progressed much from there - yet! You need to go back to that post, follow it and provide the readings asked for. That won't solve your problem but it'll get us part of the way along the route.

Norman.

[jski]

Ok norman, i will try learning the multimeter, and do the test you referred too, thanks again for your imput,,,jim m.