Repairing A Rock-Ola Jukebox Computer - 490,496, 3000x etc. - Actually a Nice Little PCB Design

[@AllanSitte]

Dang Ron... you working your brain overtime today. Glad you put this together to show how tricky it can be to troubleshoot these machines without solid circuit diagrams. Your making progress, but it would definitely be easier to fix things with the right information.

[@LyonsArcade]

We're gonna figure it out... without the schematics if you kind of track it down it helps you learn how stuff works so it's o.k.!

[@jjgriffin100]

Enjoyed the reference to the great Shango 066.

[@DAVIDGREGORYKERR]

That 74LS138 close to the UART on the left side is most likely is used for remote use of the Jukebox from a remote head unit.

[@LyonsArcade]

Ahhh, that makes sense!

[@SteveJones172pilot]

Loved this video.. Never seen a jukebox board before.. and troubleshooting w/o schematics is interesting! I was really hoping that bad inverter was going to be the cause of it missing the signal to stop the motor too (I'm envisioning the PIA not being enabled because of some address or CS line not getting through.) Thanks for posting this.

[@LyonsArcade]

Thanks for watching Steve!

[@SteveJones172pilot]

Oh yeah.. and LOVE the physical buttons on the new control panel. I hate membrane buttons. It looks like it's gonna last another 40 years with your mod!!

[@LyonsArcade]

Yeah unfortunately those membranes are crappppppp if I could have fixed that I would have, and we tried, but you're left with few options if one of those lines breaks. I tried conductive paint on a dartboard, that didn't work very well.

[@jaapvanoverbeek7330]

nice to see greatings from holland

[@LyonsArcade]

Hello Jaap thank you for watching!

[@AvengerII]

Ron, Ron, Ron...! The Fonz would have just tapped the jukebox on the side and it would be working now!

[@LyonsArcade]

Heyyyyyyyyyyyy

[@AvengerII]

@@LyonsArcade "Come back to Ork with me, Human! "We have many uses for this power you call 'Cool'!"

[@scottgm321]

I like all these videos here at Christmas. "Rock-ola around the Christmas tree at the Christmas party hop..."

[@EsotericArctos]

I think I would bypass the switch on the battery holder, or at least hot glue it in the ON position. The slightly low 5V line likely isn't affecting it, but if any chips are borderline on the high pull-up, that slightly lower voltage could stop a high being properly detected. Looking forward to seeing this fixed up, as I know you already have fixed it as you only upload videos once you've got it working :)

[@LyonsArcade]

I'm going to do a video on the way they did the power, it has 5.7 running in, then running through a regular 1n4004 diode and it lowers it to 4.7. They then tacked a second diode on the top of that one. I think they're trying to lower the amperage through each diode, with the hopes it will raise the 4.7 to about 5... but I haven't tried it yet (I just put one diode back). They're in parallel (soldered on top of each other)

[@SiaVids]

@@LyonsArcade Try replacing the diodes with some same rated schottky diodes as they have about half of the forward voltage drop.

[@macdaddyns]

fantastic trouble shooting skills Ron!

[@160rpm]

reminds me of those driving games with force feedback

[@ericernst7414]

“So we put new buttons in it”. Amen brother jukebox.

[@kevtris]

seems to have a lot of bad chips scattered around the board. I wonder if it had some kind of "event" that damaged multiple chips at once? that '138 and '04 are not directly connected to the wiring, so it probably wasn't static. maybe the 5V went to 7V or so at some point? Fortunately all the chips on there are socketed which makes testing a lot easier.

[@LyonsArcade]

This is the same machine that had the smoked up power supply so yeah it could have gotten spiked at some point....

[@randycarter2001]

They needed a buffered data buss. It appears they way they chose to do the the buffering is with a cheap inverter IC. You can only drive so many loads with a TTL output.

[@LyonsArcade]

They've got those 273's in there too but I'm still learning. It seems like a nice clean little design to me though, it's even laid out well. No unobtaninum either, outside of the actual PCB itself.

[@BroWCarey]

Love this, looking forward to the next one. Trivial question: The purplish record: what is it?????

[@LyonsArcade]

That is "Purple Rain"

[@BroWCarey]

@@LyonsArcade Thank you!

[@tabbicide]

Do you have video for 1000 3x from 1984-85. Records. The circuit board is stuck on initializing. Assuming it needs a new one.

[@jimgathercole7025]

Joe I have a rock ola 424 and the basket that hold the records won’t come on. The selected runs, the turn table runs, but basket won’t run ,any suggestions would be helpful Jim

[@davevanoerle3879]

Any chance i can find that Control Computer Testing Procedure cheatsheet anywhere, could use it for mij Rock-Ola 2000X CD jukebox, Thanks !

[@jasonsteverson4609]

Hey Ron!!

[@LyonsArcade]

Hey Jason!

[@MichaelL-03]

We have a rockola 3000x need the selection buttons replaced and doesn't read all cds. Can you help?

[@SpaceCop]

Jukeboxes today are cloud-connected and let you buy credits and request songs from outside the building. Sure hope the bar near me likes the Spice Girls.

[@LyonsArcade]

Tonights The Night that 2become1

[@gorillaau]

Ask the bar, Tell me what you want. Lol

[@naytch2003]

Lynn Anderson people come on now 🌹..When ya take ya gotta give, so live and let live, or let go..

[@waynegram8907]

Does anyone know why they used inverted buss logic? was it for noise immunity or what?

[@AliusScitmelius]

If they named it as 'display and light bus' instead of 'inverted data bus' then nobody asks why it is named as it is. There is inverting darlington transistor arrays in that bus for displays and lights - only one eight bit inverter is needed for whole bus. In later models PCB 58399-1A the 74HC273 drives directly led display and inverted bus is not needed.

[@waynegram8907]

@@AliusScitmelius but why are they using an inverting Darlington transistors array? I guess they are using inverted segments displays. Mostly Darlington transistors aren't used to invert the logic signals on the buss unless the IC chips input pins need an active LOW

[@johnmichael1979]

Membrane bad.....buttons good. Every time.

[@lileveretteyoakumiii]

Yodelayheehoo

[@LyonsArcade]

Hello Lil Everettte!

[@ud646]

I'v sent an email to "LyonsArcade" regarding the schematic you're in need of if you still need one.