Repairing The Power Supply In A Rock Ola 490 Jukebox For A Customer

ladies and gentlemen this is Joe's classic video games back with another cool jukebox repair video for you today there is a gentleman that lives right down the road from us here that uh comes by every once in a while and he let us know that he was moving but he had a juke box two of them actually that he wanted us to repair and we agreed to repair it for him so this is a rockola Super Sound I think that's the 490 rockola 490 I have to look at the back to make sure but is ack call a Super Sound CPU control jukebox and uh we're going to fix it for him in this video or set of videos I don't even know what's wrong with it he's had it for quite a while and the thing is in very clean Nice condition so we've had it here in one of our back rooms for a little while and uh we're going to fix it and we're going to film it and the reason that we're going to film it is because we're hoping that if somebody has a similar box uh that they'll uh watch this video and maybe it'll help them fix theirs because a lot of these things are being thrown away taken to the landfill because once they stop playing they're no fun anymore and they're big and heavy but I would love to see more people save them because they are something special whenever they're working so hopefully this will help you if you've got one that isn't working um now keep in mind uh on Juke boxes most of the boxes if they're by the same manufacturer are very similar so this one has a CPU in it that that controls everything that part is different but the things like the mechanism is very similar the power supply is different but it's a similar idea behind it so I'll just I'm going to go through some generic troubleshooting just to help you determine what's wrong with yours and then you can focus on that area and try to fix it so first thing I'm going to do is I'm going to slide it out of here where we can look at it a little bit better and uh we'll see what model it is on the back look at the other side of it and then we'll uh um we'll try try it out and see what's going on and we're we're doing it here in our one of our little storage rooms we got some cool stuff in here right now that's a tempest we're working on for our buddy uh down at the beach Adam uh we've got a balet Night Rider electromechanical pinball machine and we've got a gotlib swing Along old school pinball machine that we're going to be working on we've got a Namco Ridge Racer arcade game and there is a crane machine a stuffed an an plush machine hiding back there in the back so we got stuff like this hid all over the place right but uh this juke box is next so we're going to we're going to work on it a little bit so I hope you'll enjoy this video series let me slide it out and then let's look inside it too so here's the back that we're looking at this thing is in very nice shape really this is a you know you know I I wouldn't hesitate to call this like collector's quality yeah there's a little bit of issues like these it's got a couple holes drilled in it for something um but in general this thing is much nicer than they usually are and yes it is a rock ho of 490 I think the 490 and 494 were very similar I never remember which is which got her all opened up still has the original key it looks like um for the front at least very clean inside everything looking decent I say clean compared to other ones this is very clean right you'll know if you get one there haven't been there's only been 10 beers spilled in this one instead of the normal 100 uh so over here is the power supply that's usually having problems so we'll see uh this is the the CPU up here it has a battery mounted on it often gives problems um and then here's the mechanism this is the amp over here you have your coin Mech down there and you have the uh I think this is called the mechanism board mechanism PCB basically it runs the um electrical but well it runs the mech we'll just keep it like that okay so what the reason I'm showing this is because I I like to open them up whenever they've been moved just to make sure there's nothing crazy going on sometimes there'll be something hanging down the amplifier fell off the back and is laying on this on this light bulb or there's there's broken pieces of light bulb all down in through here just want to check make sure everything looks like it's in its right place so now that we've done that we can plug it up and see what it does um and uh see what we can do to fix it all right so I've never turned it on but but I plugged it up let's see what happens not much okay so I'll show you what you're looking for I know I'm going to turn the brightness down so that that light doesn't blind us revved up like a deuce okay so um here's here what you want to look for so when we plugged it in it didn't do anything so a lot of people think that uh whenever like a light like this is on that that's something significant all that means is that the AC power uh is connected to the wall and we already know that right uh but the power supply actually creates a bunch of DC voltages that the mech needs the CPU needs and all of that right so if you look on here let me see if I can we do have a light on that says default default pricing a little hard to see but if you look down here on this power spot board see those LEDs on the side on a rock Ola those should be lit up so there's one there that says -28 and I think one says positive 25 and neither one of those are are are are U lit up the motor light is lit up I don't know if that means power to the motor I would assume it does and then the one on the bottom is lit up now it could be that those two LEDs that aren't lit up are just burn out but since nothing's working there's probably a problem there so uh first thing I'm going to go do is see if I've got the schematics where I can look that up and then we'll be able to uh to see how those two get their power it could just be a fuse or something but usually if you have a blown fuse it's because something blew it so let's check out the schematics okay folks I'm running into a problem that I've ran into before um I I have the schematics for the rockola 49-1 but I do not have the schematics for the rockola 490 um they're out there somewhere but you can't even buy them the if you if you get in touch with the uh manual places that do reprint manuals and stuff none of them have the the wiring diagram for the original rockola 490 which is what this one is as you saw on the name plate on back they also made a 49-1 and a 49-2 so those schematics you can find that's what this is right here and it's similar but it's a little bit different so the power block on the 490 D1 was a can we read that 54920 I think I've got hold on a second let me change this let's have it automatically Focus and automatically do white balance okay that's better so this one is a 54920 but the one in the machine is a 5 4525 so these schematics don't mean anything um so we're going to have to do it the old fashioned way I'm going to have to take the power supply out and we're just going to have to look at it that it's a similar setup it's just you can't go by the wire wiring diagram or anything so I'll pull it out on the machine let's put it on the bench and we can check it out all right folks I have pulled the thing out of the box and this says rockola power distribution 545 25A and it has different little things to say if it's being used in England or United States it says domestic because this made in the US um so it's just like when we're working on arcade games you just start at the wall and you follow the power into the machine or if you're working on a on a uh pinball machine so this is the first place that power comes to and uh it's not working right so let's see why now it's unplugged of course and you do want to be careful because there's a big old Transformer in here which means it's got some some some power let's see what the inside looks like I wish I had a schematic that would make things a hell of a lot easier I've worked on these before but little secret about me me I have a pretty bad memory like I don't I remember messing with it but I don't remember how I fixed the last one okay so the whole front plate comes off and you can see um the the 12vt we had and the motor DS4 we had not really sure what that is but the -28 and the plus 25 we did not have so these caps by the way it looks like my brother Joe's been messing with it trying to fix it so he attempted it um yeah I see some stuff down in there okay so I guess we're going to check out some fuses again everything's unplugged we're not uh we're in no danger of getting Z Zapped a lot of times people on things like these they think oh my Transformer's bad BL it's usually not that it's usually something simple like a cap burnt up or a resistor burnt up or a transistor or something the Transformer would be a big deal so I don't even know what these fuses go to you know I'm just checking them it's good it's good it's good it's good all right so all those are good oh here's another one also good all fuses are cool people all right so um H you would think with a voltage gone you'd have a fuse blown but you'd be thinking wrong let's see if I can get any kind of a measure on this transistor mounted to the side 556 0551 all right [Music] so that is a 7805 okay so that seems to be decent all right so I'm going to take this off so we can see down in there if I had the schematics that'd be much better but hey you win some you lose some it could it could be a scenario where it's working and the um um the LEDs are burn out or something these caps look like crap see what I can do here let's pull some more crap out of here what do you think let's dig deeper Dig Dug deeper there was was a sequel to Dig Dug in the I think in the 80s called dig Doug deeper what do you think about that so how is that mounted just little those standoffs no there's something holding it what have we got here it's moving I hate to pry this is black B for black help me help you Mr jukebox help me help you have I told you in any of my videos about my theory of inanimate object so here's my theory okay this juke box only has one purpose yes I was just trying to put that in there to pry on the other end of that board the only purpose of this Juke box is to play records right and the only purpose of this is to play is the it's a power supply to create power and it's not doing that right now so my theory is is that it wants to work towards its purpose you know like it was made its only purpose is to make power so it wants to do that but it's just got a few little problems so usually if you'll mess with them a little bit they'll do their part and help you out too so we're going to see if we can get this thing to do its thing okay so these are labeled and I don't want to take those off of there if I can help it that looks like a nightmare waiting to happen but I believe I'm going to so this is eight and it's black all right we're going have to write it down people we're also going to take a picture matter of fact we're going to take several pictures just to make sure so eight is black seven is blue and red six is blue and yellow five is red just red four is red just red surely that won't get screwed up three is red and yellow two two is green and white and one is I'm going to put fuse because it goes it's green and white as well but it goes to a fuse so the what we're going to do just to be super safe because you know you can't ever be too safe we are going to put some black electrical tape on number five so five is red and tape okay Tada now what are the odds that maybe maybe this rectifier board is on the schematics maybe they use the same board inside 542 I wonder maybe we'll check later okay so I've got my multimeter here what am I going to check what am I going to check people I have my handy Little Resistance values chart from twisty wrist arcade now I bet most of y'all watching have all of this memorized so you don't need one of these but I got this from my buddy riper at Twisty wrist arcade helps me cheat know what else I need it's kind of the reason these videos in the back room look kind of dingy sometimes it's because it's darker back here so about a year or two ago I found this flashlight in a pinball machine and I've been using it to help me see ever since yellow purple rib so that's four [Music] S 4700 4.7k ah good enough so it was it was counting up and it got up to like 2,000 ohms the reason is because it's charging one of these caps probably this one so that's not going to work too great in circuit let's try the dodes please let me have a diode burn up that one's not that one's not both of those seem to be fine when there's four it's usually like they're turning AC into DC so I bet they're fine too they all seem fine although they could be replaced I guess here I'll put it like that maybe you can see it better H those seem fine those seem fine Q2 and Q one without the schematics I can't even really tell I guess I could track it down and everything it's probably right that's probably right I see two more dodes it's probably right okay then I got two little transistors here oh that's that CR one what in the world is that that's a bridge little tiny Bridge not seeing much wrong people unless they're bad connections [Music] H I don't see any more resistors smoked I guess I I can check these two little transistors here sometimes they'll you know it shouldn't really give us you reading both ways but I don't even know what they are and sometimes the way it's being used you get stuff like that both of them are doing that so maybe all right I don't see anything definitive except for this big huge cat here that's screwed up so I wonder if I have one of those 2200 UF oh I'm not supposed to say UF oh I'm so sorry I apologize 2200 microfarad I forgot y'all don't like it when I have too much so let me see I thought I had one of those somewhere that's um that's not still looking still looking boy I hope I got one that would be really cool to have the correct part that would be just swell what is in here what in the world is this what is that is that the absolute correct part and it's even axial ter termin got axial terminals on it oh my Lord this is amazing all right so I'm going against my better judgment here and I'm actually going to let people see me solder something um because this is like a troll bait so whenever people start complaining and telling me I'm doing it wrong I can just block their ass and then I don't have to worry about them down the road I'm sure most of you are going to be just fine all right so 2200 look this one says am I too high there's no you what the world so I wish I could explain to you what that says but I'm apparently if I did that I would I would pronounce those letters wrong so I can't tell you what it says but it's 2200 and then there are three letters and then it says 63 volts DC let's give it a little let's give it a little hip shall we got this new conle this is the wrong tip for this but it should get the job [Music] done might have to crank up the juice people we were working on something earlier that didn't need as much temperature all right here we go that's better so to to the amateur soldering people out there like me um if you add a little solder it makes it easier to remove the solder basically you're mixing new in with the old and then you really need to make sure that the board is marked right so it's saying positive is here and the capacitor is saying that this was positive so but see how the end of it's all mushroomed up now a lot of people would say oh look that one's exploding I'm not so sure man that might be how that particular type was originally made I don't know but it sure looks bad so we're definitely going to replace it oh you know what it's like rubber or something what the hell I I think that might be how they made it that particular type just my opinion see if I've got a solder sucker here that wants to cooperate likely no cooperate with us people cooperate with us you know usually when I'm working on this stuff if I'm not filming it I'm listening to music but I can't turn the music on because then YouTube mutes all the audio and the videos so you can't hear anything I'm saying which some people would prefer but most of you would probably be annoyed by that okay so we're going to put in our capacitor make sure that it's oriented properly so it's saying negative is this way which means positive would be this way get it back to somewhere near the center there I always like to turn mine where you can read them doesn't really matter but like see this one what's what cap is that I don't know because whoever put it in there didn't give me any respect so I'm giving the next guy some respect he'll be able to tell what that is because of the way I put it in there or the next girl it's the royal guy women can do it just as well as I can they'd probably be better at it because they would uh well there's no reason they'd be better either they'd just be exactly the same gota watch what I say I don't want to make anybody angry tried to bite me see I can get it looking nice and clean so fresh and so clean clean that's good all right good enough good enough we'll cut the leads off and then just to tie it up with a pretty little bow put a little zip tie action on it like they had man look how nice that looks look at that look how beautiful okay so I'm going to replace these three as well and I'm going to check these uh resistors and then we'll see what we can figure out oh you know what I'm also going to what's that I see could be could be could be I'm going Reflow those too because I don't see any cracks or anything but might have some screwed up solder joints there give it a little Reflow little Reflow never hurt anything all right so I'm going to kick y'all out of here turn on the music and I'm going to replace those three and I'm going to test the resistors that I didn't test they look fine you know I wish I knew if I had the schematics it'd be so much better I could check the voltages going in on the wires see where what's going on check the voltages at the fuses and all of that but a said is not to be uh so uh I'll do that and see what we got okay folks so I've got the Caps back on it got the board back in it we're going to try plugging it up and see what we get even though there were no fuses blown or anything I'm rig it back up put it back out once if I can um and then we're going to see if anything has changed and then we may be able to at least try to test some of the voltages on this board and see if we get anything I don't know without the schematics something some of you that are more experts on this stuff could probably look at the that board and tell what's happening okay where is my power switch okay it's down there okay so we're going to plug it up and hope we don't blow anything up nothing is touching everything looks [Music] cool so this is when you know you need to be careful don't do as I do just watch me do it so we may Sparks fire might have all kinds of problems hopefully not holy crap I'm better than I thought I was I wonder if there's something where whenever it's in the cabinet it uh something shorting those lines out or [Music] something oh you that H that's very interesting so you have those four LEDs on it means the voltage is there it might be wrong you know what I mean like you might like it's supposed to be 25 that led is not measuring 25 it's just being turned on by something in the circuit but hell I got all four lights on boy I like the looks of that I have fixed not maybe maybe the same block I don't know but so these power supplies for the rockolas a lot of them are they're very similar but they're a little different so a lot of them have this little board um with the LEDs on it um and I have fixed a couple of them before by taking going down to that little board we were just messing with uh and and working on that but I've had some before where there was actual damage down there so there would be like a a resistor that was burned up or a cap that that exploded on one of them that was real fun I don't know how that even happened it didn't leak I mean it looked like it caught on fire you know so maybe that board usually needs some work I mean clearly it did with these old capacitors let's look at the date code if there is one I can't decipher that one let's see if this one's got a plain one yeah so this one says the 16th week of 1984 um so April 84 okay so I'm going to turn it off unplug it very carefully make sure everything's cool put that uh back down and then we'll try it back in the uh we'll try it back in the uh cabinet see if we get anything different okay so I've got it back in I haven't turned it on yet but to be honest I'm a little suspicious that that fixed it because I'm what I'm thinking is is that I didn't try it before with anything unplugged and then I didn't try it before I replaced those capacitors on the bench so it could just be that whenever it has a load on it it doesn't work right so we'll try it and see but I I don't know so my I hate to be a pessimist but it very well could be that whenever we turned it on it didn't fix anything and my pessimism played out okay so the next thing we're going to do is we're going to start unplugging stuff hm you know what though that could be it still could be the power supply because it could be that there whatever like whatever creates the 25 volts or whatever the 25 volts is uh doesn't work under load or it could be that whatever is plugged into it is um shorted or whatever so it's making it turn itself off I'm going to turn it off and I'm going to unplug everything and then we'll plug it all back in with nothing on it and see if it if it does what it did on the bench so I unplugged just the amplifier and we've still got the same problem all right so yeah we got our L our our uh lights back on with both of these low voltage power plugs unplugged so we replaced those capacitors which I guess is good but that didn't fix anything so we still either got a problem with the power supply uh not being able to put out enough uh Power underload or we've got a problem where um the mechanism is shorting it out or I guess it would be the mech either the mech or the uh control unit let's see if there's a different plug for each one okay so with the amplifier and the smaller of the low voltage power plugs plugged in we still good so it's something on that Big 12 pin plug there okay so I've got four lights and I unplugged the CPU and we're good so the mech is still plugged up I don't even know you know I wonder if I well without the CPU I guess I can't scan or anything and this board here I'm trying to see if there's like power over here at all I'd like to know for sure that it's a control unit I didn't unplug anything over here so H schematics would help a lot okay um let me you know what I could do I've got a control unit that does not work so I could try putting it in plugging it up and seeing if it still does it if it does still do it I've tested that one in other machines it doesn't work but it doesn't short out the power supply so if I put that in and it doesn't work but it doesn't you know what I mean so if I put it in and that one also makes the power supply do its thing well then we' got a problem in the power supply but if I put it in and that one's fine then we've got a problem on the control unit all right so this is the one that I stole out of there and this is the one that I put in there see how the system test light is on I know with this big old um fluorescent here it's making it a little hard to see so the system test light is on because that's what it was doing but all of our LEDs are fine with that one on so there is something on the CPU that's in there that is shorting out the power supply and making it not work but hey we've tracked it down right so um this video is getting pretty long but I'm going to take this another room and we'll pop the front off just to see if we see anything obvious so looking at the wrong schematics uh it has this one power plug here that it says is the the mech CPU power cable now this is probably slightly different on the U on the 490 the 49-1 the 49-2 but the CPU and there are two different CPUs too with different connectors but the power connector seems to be the same right but look look real close at what I found here so there's c203 and c204 10 mf35 volt right now look what they're connected to pin 11 on the connector to air saying is the power common right and then c204 connects around and connects over here to 26vt DC and then c203 connects over here to -28 volt DC that's our two that we are having a problem with so c203 and c204 Bridge across the ground and the two voltage that we do not have Okay so I've taken the board out of the game and then on the this is the power connector here here right and on the very back of said power connector I'm trying to get it where I can show you when I check with the meter let's put some light on the situation okay do you see what I see a star a star do you see what I see let me go in a little farther I'd like to get it just right for those of you who go why don't you use a tripod now you know cuz it's a pain man I'm all over the damn building I'm going in the back working on it bringing the stuff back trying to show you this looking at the schematics I just don't have time to set up the tripod all the time but this time around we're going to do it that's c203 and that is c204 okay and they're tantalum caps now what do tantalum caps do they short all the damn time right so you probably won't be able to see this maybe you will cap is shorted and the other one is too it's just hard to get to it from there either the Caps are shorted or the two rails are just shorted because of uh maybe there's something else doing it but I'm seeing myar caps right across the power rails come on and they're shorted whenever you measure it in circuit you know it's those caps but here's the thing this video is long as hell I'm going to leave you hanging because this thing takes like 10 minutes just to take the freaking board apart right and uh just looking at this board would be really cool video right so I think we're going to leave it here till next time and then I'll film another video of us fixing that now so what did we accomplish in this video all we accomplished in this video was we tracked down that the power supply was probably fine the whole time but we replaced the capacitors on that one board so they won't be a problem in the future we were my brother had already replaced the capacitors on that board on the front so they won't be a problem in the future so and and we put another board in so by testing The Other Board in it we know that the power supply is good to go no problems right um but now we're onto the CPU so we'll do that on the next on another one so we've basically we've met we've narrowed it down to this CPU when plugged into the power makes the uh LEDs turn off on the power supply when you put another uh known to not work but at least attempt something uh CPU in it doesn't make the light short out then whenever you test you find that the two the the two rails the -28 and the positive 26 um are both shorted the ground on this board so clearly this board is the problem so I could just swap those two caps and throw it in but I've I've got history with these it takes 10 or 15 minutes to take it apart there's a battery in there that needs to be removed and replaced it'll probably have a bunch of battery damage that we have to clean up uh and then even once you do that the board may not work so um we can do a whole video just on this and we will so we hope you have enjoyed it we've at least narrowed it down right so leave your comments below let us know what you think we're going to bring this sucker back from the dead now if you are watching this video you can rest assured that I've already fixed this thing or I wouldn't have uploaded that video that's how I do right so for instance the uh We've got another jukebox we've been working on a ds160 I uploaded those before I rebuilt the amplifier and all that stuff but the reason I uploaded them was because the machine is up and running and playing it still needs work done but it's fixed right so this one is not up and running and playing yet but the reason I know in this video to tell you that it's up and running and playing is because I will not upload that video until I get this thing up and running and playing so if you're watching this video I'm not going to leave you hanging oh hell no you just need to wait for the next video to come out it's coming soon or I wouldn't have uploaded it um so our next video we will work on this so leave your comments below let us know what you think let us know if you're having a problem with yours maybe we can give you some advice if it's real deep in the weeds sometimes we don't have the time to get all into it if anybody out there finds the schematics for the original 490 not the 491 and I don't it's it'll say 490 das1 not that one I got that one not the 490 D2 not that one that one's out there all over the Internet the one for the original 490 hard to find you can't even buy it so uh if you find that let me know I sure could use it uh but leave your comments below let us know what you think about it make sure to give us a thumbs up for taking the trouble to film it for you and uh we down below we'll put a link to Amazon we've been trying to get people to do this little Amazon thing for us if you go to Amazon to buy anything doesn't have to be something we suggest or anything if you use our link below then Amazon counts that as we sent you to Amazon because I'm doing a commercial for Amazon right now just by mentioning it right so if you go to Amazon through our link it doesn't raise your prices or anything but it puts our name up in the URL of your of your Amazon site whenever you go there and then everything you buy on Amazon they pay us a royalty for it's so cool so people keep uh people keep buying things just you know anything small you know like food a lot of people buy a lot of food on Amazon and uh whenever they do that it gives us some of Amazon's money not your money because it doesn't raise your prices you don't have to do anything you don't have to sign up for anything or log in or anything all you have to do is click that link and whenever you do it uh it tells them that we sent you there so we appreciate all the people that have been doing that uh that's pretty awesome and we're happy that we found a way for people to contribute to us but that they don't have to spend any money you know because it doesn't charge anything extra or anything people have been asking us if we're going to do patreon we're not going to do that uh just because we're a business and we don't want you spending your hard-earned money on some guy just ranting and raving on uh repair videos we want you to be able to watch them for free and not have to donate or you know um you know we've got special videos for the patreon people and all that we're not going to do that now if other people want to do that I have no problem with it I'm just not going to do it for me um we'd rather keep everything free where you don't have to pay anything but if people want to click our Amazon link that helps us out and we appreciate it so leave your comments if you have if you need something on Amazon click the link and uh we'll see you on the next video thank you for watching hopefully we'll get this sucker running tomorrow but tonight it's late I'm going [Music] home [Music] people you may not have heard yet but we've got a second channel that we've opened up for our brother Donnie my brother Donnie and the name of the channel is my brother Donnie so go check that out if you like it has nothing to do with arcade games but it's more like farming mechanical work if you like seeing things be repaired he does stuff like that a lot of times if you like the kind of vibe we bring to things positivity and uh a uh can always get it done attitude I get that a lot from my brother done so go check him out um me and him I'm also on that channel right now me and him him and I are working on this old dilapidated mobile home that we bought and it's kind of funny cuz the thing's destroyed and we're trying to fix it so uh if you get time go check out my brother Donnie here on YouTube the link is on our Channel see you on the next video [Music] n [Music] n