Seeburg smc2 Juke Box Help.

Hello everyone, I have a smc2 and am having an issue with the digital selector screen. The other day I disassembled and cleaned all the pins to make sure the connection was good. I put it back in and after messing around with a few wires it started working perfectly. The next day I turned it back on and now it isn't working. Sometimes it'll show parts of numbers and the player keeps turning and none of the buttons respond at all. I know there are issues with theses computers and need some advice on where to start. I do have a nice soldering station and just finished recapping my pioneer sx-1250 so I'm not afraid to replace parts if I can determine what is bad. Thank you guys in advance! I really appreciate it.

Hi Arran,
The SMC/100-79M models all had many "computer problems". I quit repairing them as they are almost always "intermittent", and do crazy things--did so even when "new" ! I, ( along with a couple of other guy's) designed a new, one board replacement, for all SMC-100-79M's. I have been building them for the last 5 years--no reported problems --yet ! ( PM me if you wish to purchase one)
Meanwhile--
On the old style MCU's, try the following --it MAY work -- Install two new batteries (the new one does not need, nor,use batteries), with the power OFF. Turn the power on, and hope you get a "clean boot-up"( numbers on display OK--able to make selections). You may need to power it off/on several times ! If, when, you get the clean boot up, install the third battery with the power ON.
Big hint: On mechanisms that have a NIDAC motor--be sure to oil it with ONLY 20 wt. ND oil ( see "lubrication" above) AND, be sure you do so often--these motors tend to lock up, and burn-up, if not properly oiled ! ( Other brand motors are less likely to burn up, when locked up). ( Our new MCU automatically shuts off the motor if locked up for over 9 minutes) Ron Rich

Thank you very much for the reply! Two questions

1. what kind of batteries? c?

2. What and where is the NIDAC motor?


Thanks again!
Arran

Turning it on and off 30 times didn't do much. my next step was Unplugging the connector inside the control unit and plugging it back in. Now it works but I'm sure if I cycle the power it will fail again. Here is a picture of what I unplugged. Any ideas?

So now it's playing but the lower speakers are not working at all.

Hi Arran,
1. Open the lid, ( have some help, or a broom stick to prop it open), then open the MCU box. When it left the Stern factory, it had 3 C cells in a holder, on the inside cover of that unit. I have seen the holders/batteries changed--
2. The "NIDAC" (brand) motor is the main/only, motor used in most of them. Some Bodine brand motors were used also--
You un-plugged the Phono Control Center (PCC), Inter-Face Board (IFB)--don't know why that made it work , other then you had a "dirty connection" there ?? Ron Rich

Ok, so I figured out the speaker problem. They just don't work anymore. I need new ones.... Now I'm installing records but when I select a song it picks up the record just next to the one I select. I'm sure there has to be an adjustment right? I am ordering a manual today but can someone give me a tip on this one so I can listen to my joy box? Thanks as always!

Hi Arran,
On the speakers--are you sure ? Very rare to have them fail---
On the selection problem--
Do you have a mechanism that always stops at one end, or does it stop after it plays the last selection ? Does this happen if the mechanism is traveling in both directions Ron Rich

As for the speakers, I removed them and tried using the 9v battery test. When they failed I hooked up an old speaker I had laying around and it works on both channels. I will check tonight on the changer to verify what it does exactly. From playing it last night it seems the selections on the top of the juke box play the next in line record but the ones on the bottom play as selected.

On another note, Does anyone know where I can buy foam surrounds for the upper speakers?

Hi Arron,
If only one side s mis-counting--the limit switch is not adjusted for that side. Do you have the Tech Manual for it ? Instructions are in that manual. Speaker foam might be a problem--that jukebox should NOT have speakers there. It was designed to use horns, but Stern "could not get" horns (wonder why --could it have been that they did not pay for the last ones they got ??) so, they went with speakers-- from many suppliers, sometimes from Radio Shack--- Don't know which ones were installed in your phono ? Ron Rich

I don't have the tech manual yet. Do you sell them? As for the speakers. I found some horns and speakers on ebay for I'm guessing an earlier model. Would that be a good option? I am going to remove the changer assembly and do a good cleaning as it's pretty dirty.

No,
I only sell the two guides I wrote-- see above "sticky" for legitimate sellers.
Horns/ speakers from the SPS, up, models are fine--connector for the bass speaker may be different ("bullet" type used in earlier speakers).
You will need to re-wire the horns as per the tech manual, prior to use !!
IF you are going to remove, and clean the mechanism ( "changer" ?) I strongly advise you to first purchase, and read, my Seeburg Mechanism guide (PM me to order it directly from me).

It seems that when the player is traveling to the right it picks the correct selection. If traveling to the left it skips the selection and goes to the next one.

Two things can cause that problem--
1. The RH limit switch adjustment
2. Lack of, or use of, improper oil
To test--scan mechanism to RH and remove the motor fuse select #277, and turn motor coupling to point the it detents, then slightly past so the detent coil is not energized. Check to see if it has stopped on 277 or 276. If on 277, probably an oil related problem. If on 276, check display --if it shows 277, it is probably the limit switch problem.

Ron Rich wrote:Two things can cause that problem--
1. The RH limit switch adjustment
2. Lack of, or use of, improper oil
To test--scan mechanism to RH and remove the motor fuse select #277, and turn motor coupling to point the it detents, then slightly past so the detent coil is not energized. Check to see if it has stopped on 277 or 276. If on 277, probably an oil related problem. If on 276, check display --if it shows 277, it is probably the limit switch problem.

So I finally found time!!! Doing the above it did stop on #277 going to the right. I then hit #126 (Scanning to the left) and it stopped on #127 and displayed #126 on the board. It does stop on the correct selection if traveling to the right but always skips one traveling to the left.when it skips one going to the left it does display what you selected not what it picks. So is this a lubrication problem and if so where do I need to lubricate to solve the problem?

Thanks again, Arran