AMI Continental 2 power supply schematic?

[rudy18d]

Greetings,

Having an issue with the transformer overheating and smoking 5 minutes after turning on my Continental 2. All I did was move to another room in the house, lol.

I have several "Service Manuals" for the jukebox but I cannot find a schematic for the power supply. Can some please direct me where I can download a schematic for the power supply please? TIA  Rudy

[Deadhead Japan]

Rudy,

Specifically, what transformer are you referring to? The junction box transformer? The 26 volt transformer or the transformers on the amplifiers?

Neal

[rudy18d]

Specifically, I was referencing the only transformer on the power supply, L-1234 A9-127. It was on the title of the original message that I was asking for schematic of the power supply, but I should have included it in the body text as well.

Update, the over-heating of the transformer seems to have been because the transfer motor was bound. Seems the adjusting screws were not tight on the transfer motor, and when I took the jukebox over several raised thresholds into another room, it must have jarred the transfer arm motor to move enough to cause it to bind. So, with the motor bound it caused the over-heat of the transformer as it was trying send current. That has been resolved.

However, the jukebox now seems out of sequence. I can get it to read and write a selection, record wheel moves to the selection and stops but the transfer motor doesn't engage and grab the record and move it to turntable. I can manually engage the switch to make the transfer work but it doesn't do it on its own after the selection is made.

Another symptom to consider is the turntable now turns constantly?? I thought the turn table only turned after the 30v signal engaged the solenoid to activate the 110v connections for the turntable and transfer arm??

What should I look for next? Any ideas on next steps to get the sequence back? Seems I just need to get the transfer motor to engage after the read /write of the selection. Crazy that it was working fine until the move out of one room, the move down a hall to another room. Ugh

TIA
Rudy

[jukenorman]

"What should I look for next?"

Look for your service manual lol! The schem-a-grams there will help you. For example, cam switch 1 operates the turntable motor. Does it not load either an A side or B side? If so, is the transfer motor relay energising? Otherwise, it's back to the manual!


Norman.

[rudy18d]

Thanks Norm. Neither A no B side now. I have the "Service Manual" and it's not helpful. Is there a specific manual or set of schematics that helps with troubleshooting this particular Continental 2 jukebox that you know of?

[jukenorman]

The manual pages from RCS-5 onwards show you the schematic and what circuit is made - as well as describing in words what's taking place - for each step. I think it's fairly clear and self explanatory and it's what I use. There is also a fair bit of dialogue on the forum pages, the Continental has been quite well covered.

Norman.

[rudy18d]

humm...I can't find those pages in my manual. I have an older printed copy of "AMI Continental and Lyric Service Manual" that must have pages missing. Guess it is time to purchase a current complete one.

Thanks Norm

[jukeboxmarty]

RCS-5 refers to the page number of the manual section titled "Record Changer Service Manual". It should be present if your manual is complete.

[Deadhead Japan]

Rudy,

To clarify... When your box writes in a selection, are you confirming that a pin is being pushed in? If it is, are you hearing the stopping paddle hit the pin as it passes by?

"I can manually engage the switch to make the transfer work but it doesn't do it on its own after the selection is made." Are you referring to the stopping switch? Also, if the magazine is continuously scanning, are you verifying that the plastic cog is winding down to engage the scan stop switch?

Neal

[rudy18d]

Norm, et al.

I purchased a new manual that had "RCS5 and forward" information you referenced, and I tediously followed the adjustment instructions and feel confident cam shaft switches are spot on as is CS6. The gap between the tone arm cam and the cam follower plate is .040".

Issue remaining is that all odd numbers selections play normally. If an even number selection is made, it selects correct pin, carousel rotates and stops at the correct even number, but when the transfer motor should kick on for the gripper to grab the record nothing happens. Just a slight humm. This is when the normally 28VDC coming from the junction box drops to 10VDC and the transformer on the junction box quickly starts to overheat. Moving the switch on the Record Changer Control Box to Off stops the humm and returns the DC voltage back to 28 VDC at the junction box. The even number selection must be cleared before moving the switch back to run on the Record Changer control box.

I checked the even stop switch and it is functioning correctly and the gripper is aligned directly over the record. Ideas about why odd numbers play normally and even numbers cause the above mentioned VDC drop, subsequent transformer overheating, and no gripper movement, would be greatly appreciated.

TIA Rudy

[jukenorman]

Hi Rudy,
I would suspect the toggle shifter solenoid No.2 (B sides). Probably the easiest way to prove it is to manually operate the toggle shifter to the B side, disconnect a wire from toggle shifter solenoid No.2 and then make another B side selection - if it works OK, then it's that solenoid.

Norman.

[rudy18d]

Hi Norm,

I did as you suggested. I moved the toggle shifter to the B side. I disconnected the orange wire at the terminal strip that went to the No.2 solenoid. Turned on the jukebox, made an even selection and had the same result unfortunately. Got all the way to when the gripper should activate and grab the record but nothing after that. After I reconnected the orange wire to the No. 2 solenoid, I cleared all selections, selected another even number, same result. This time after poking around the gripper I did notice that the No. 2 solenoid got very hot pretty quickly. Should I assume the solenoid is bad and try and find another? Or could something else be causing it to overheat and drop the DC voltage at the junction box from 28 VDC to 10 VDC & make the transformer at the junction box overheat as well?

Thanks Norm
P.S. I would like to test the solenoid off the jukebox but What is the easiest way to get to the No. 2 toggleshifter? Also, what is the easiest way to unscrew the solenoid from the bottom? It is right up against the record bonnet. Really cramped in there.

[jukenorman]

I'm concerned that there might be a wiring error. Could you try that again with both wires of the toggle shifter solenoid disconnected?

The Continental is noted for being difficult to work on.  Often the only option is to remove the mechanism to enable access

Norman.

[rudy18d]

Good day Norm,

Well, that was a good call to disconnect both wires. Referring back to RCS-30, I disconnected both wires coming from toggleshifter solenoid No. 2, the Blue wire from cam switch number 4 and the Orange wire connected to the terminal strip. Manually moved the toggle shifter, made an even selection and it worked just fine.

So, do you still suspect a wiring error, or should I just start looking a new solenoid?

Thanks again for all your help and patiently sharing your knowledge.
Rudy

[jukenorman]

Yes there must be a short to ground within the solenoid coil. I thought it was better to be certain before you needlessly might have replaced the solenoid. So yes go ahead, not a wiring error!

Norman.