Post by Ron Rich on May 26, 2018 2:57:09 GMT
This is a simplified example of a "generic, RECORD playing" jukebox's sequence of operation for "newbies", or anyone who does not understand what should happen, when--
Power on (wall plug/on-off switch on) Lights and all components get power--coin inserted to enable selector to function ( "select", or "credit" light should indicate a selection is available)--"keys" pressed for a selection, request set into "memory", motor started and unit searches (scans) for selected record.
NOTE: This is the "first sequence" , or "half" of the process--and other then to possibly use the same "power supply", this and the second sequence that follows, have ZERO relationships. ---
2nd sequence: Electro/mechanically stops at correct spot, puts record on turntable--plays record, closing of the end of record reject* switch, returns record to storage area. If other selections made, it scans for them, if no more have been made, motor stops, or returns to a "home position", before motor power is removed.
For CD players-- slight difference in that the laser is able (one hopes !) to find a TRACK, on the CD and only play that one track.
"Wall boxes" operate semi independent of the main unit, in that they have a self-contained "pricing unit", which enables them to unlock their keyboard and transmit some type of "code" to a receiver (aka "stepper"), when keys are pushed.
Remember what a jukebox was MADE to do-- as I have said before--NOT, to play records, as most seem to think--but, "TO MAKE MONEY" !! (in most jukeboxes, there is NO "free play" function ! If, money is not needed, in most cases, some type of "jury-rigging" has been done !)
"Generic" Trouble shooting: Once one understands the systems involved above, one can visualize that there are several independent systems that operate in sequence here. My method of locating the problem is to divide the systems, into two main groups,after the "money related" problems. The "money function" is sub divided into 2 groups--1. coin "handling" and "pricing" or "credit" unit functions. The handling portion takes the genuine coin down to the coin switch. 2. The switch energizes a coil inside the credit/pricing unit. In 99.9% of the cases, after the coin system is addressed, and working, the problem is difficult to understand. At that point I sub-divide, the phono into the two "main groups". In Seeburg-ease ( and most model RockOla's also ! ). #1 is the "Write-in" process. This is where the memory is triggered to remember which selection a customer has selected. The 2nd is, the "Read-out". This is the process where the mechanism motor has been started ( by process #1), and there is a "search" (aka "scan") going on to find the location of the selected record. I find it easier to check #2 first, as it's usually less involved. I will leave the rest to you--do your "homework"--read the printed material, both here AND, in your Service Manual, Trouble shooting guide (if a Seeburg, or available !), and understand it--work from there. Ron Rich
* No, Zero, none-- "jukebox" should ever "eject" records. Once in awhile they all do, and when they do it can be a very serious problem ( almost always destroys the record{s}) All Jukes are designed to RE-ject, records at the end of the record, or when a "RE-ject" or "cancel" button is pushed.
