Phonoland

Hi Again,I have a rock ola 454 which has an intermittent selection fault,my engineer is confident that it is a problem with the selection box but i have been looking for replacement and i can only find a couple for sale which are both untested can anyone suggest where i may be able to get a good one.thanks tony.

You MIGHT get some help on this IF, 1. you went into your "profile" and posted your location--at least country-- 2. If, You 'splained what you mean by "---the selection box." Ron Rich

Hi Ron.Sorry im new. the box i am talking about is in the top left hand corner of cabinet and has two plugs in the front. i was told it was the selection box but you will no doubt know the proper name. tony.

Hi Tony,
No--sorry, I don't know the insides of RockOlas well enough to even guess--hopefully someone else will--Your "engineer" well should ! Ron Rich

Thank you anyway ron.

Hi Tony,

Like Ron but even less knowledge I do not work on Rock Ola, There are a number of people that work on these in the UK that are members of the jukeboxjive forum. www.jukeboxjive.freeforums.org

Regards
Alan

Alan Hood
ami-man
UK

Hi Alan,Will try that thank you. tony.

Hi Tony

Can you be more specific about the "intermittant selection fault"

What are the symptoms ?

Can you add credits ?
Do the 1st, and 2nd selection lights come on ?
Does the button unit latch on the 3rd digit press?
Does the write-in arm start to rotate etc etc.

I have restored an electrically similar machine the 474, which has the same mech, and very similar selection system.

The selection control box, (not sure where its located on your machine), hinges open and contains a couple of relays, fuses and a printed circuit board, which has
a couple of edge connectors on. The button bank unit connects directly to this unit.

Your "engineer" should be able to assist in the checking, and or repair of this unit if need be (nothing more complicated than a few SCR's)
You would be wise however to make a start by simply cleaning the edge connectors using dioxit or similar.

All depends on the symptoms of course, we need more information.

I am not a jukebox engineer myself. But I do know my way around electronic and mechanical equipment.
I restored my machine (including repairing said "selection box") from a complete basket case.

HOWEVER the purchase of a service manual and a methodical approach to fault finding is essential.

Pete



Pete

Hi Pete thanks for post. well the problem is that you can put in say ten selections all buttons working fine but sometimes wont play the first selection just blank screen,other times it will play maybe six or seven selections and stops then you have to push the top contact breaker and will carry on.the problem trying to watch what it does when this happens is you never know when its going to do it.my engineer thought at first it was the connections of front two plugs and suggests that a new box should cure it. tony.

Hi Tony,
To put it "nicely"--which I am not famous for--, your "engineer" needs to be changed.
What does the silk-screen say that circuit breaker is for ?
Ron Rich

Hi Ron. Not sure what you mean by silk screen but that breaker has mechanism written underneath it. thanks tony.

Tony,
"Silk screening" is the process that the letters you see, were attached to the metal with--
The "mechanism" CB has absolutely nothing to do with the "selection control box".
The fact that it is tripping, indicates a problem with either the basket or gripper motor.
Ron Rich

Hi Ron,Many thanks for that, i will start to investigate those areas. tony.

Hi Tony.

Good, we're getting somewhere.
As Ron has mentioned, it sounds like a problem with either (or both) of those motors.

The Mechanism CB is in fact a resettable fuse, and is tripping because too much current is being drawn through it.

Get your "engineer" friend to help you drop each motor out in turn and check them, the brushes could be worn, or even non existant.
They should ideally be completely dismantled, cleaned /checked and regreased. While they are out check that the basket and gripper arm are able to move freely.
be sure to note how they come apart, and the fitting of the washers and bearings. Take pictures if need be.

The gripper arm is particularly known for being seized due to congealed grease. This has been discussed at length on most of the Jukebox forums, Google is your friend here.

Any excess load on those motors will cause the circuit breaker to open removing power to the whole mechanism.
This will usually occur at any time either the basket or the gripper is moving.

If you are in any doubt about performing a repair to this level, don't. Get the help of someone who can.

Pete

Hi Pete, Thank you for post i will go through it with my engineer. tony.