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Post by johan45 on Nov 13, 2023 15:45:06 GMT
Hi all, I've perused some of the threads here and haven't really found my answers. If I did I didn't know what I was looking for. We have an old Rhapsody II not sure of the production year. Everything worked as it should for quite a while but now it seems it doesn't cycle properly. What happens is it loads the final 45 selection onto the platter, the tone arm sets the needle and then it stops and remains that way until another selection is made. It can sit like this for days on end, when another selection is made it will start playing the last one that was already loaded. When that's complete it cycles the next selection and stops. It will play multiple selections but never finish the last one. I have discovered a broken home snap switch on the selector wheel but not sure how long it has been that way. Here is a pic from the manual and any help would be appreciated.  tinypic.host/image/home-snap-switch.myvVG |
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Post by jukenorman on Nov 13, 2023 16:23:58 GMT
You've pretty much answered your own question! The wobble plate switch and home switch are in parallel. Thw wobble plate switch holds the play control relay energised until the final selection pin is cancelled and then it opens. The home switch then holds the play control relay energised until the final selection has been completed and the magazine scans to the home position. Look at the sequences in the manual 6 to 11 (pages 42 to 47). You need to fix or replace that switch.
Norman.
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Post by johan45 on Nov 13, 2023 16:28:41 GMT
Thanks, Norman. I assumed it was the likely culprit but my understanding of the logistics of these machines is quite limited. I guess the next question is whether it's repairable or replaceable. It's literally in pieces I haven't removed the whole thing yet but the roller assy arms appear to be broken.
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Post by johan45 on Nov 13, 2023 21:47:44 GMT
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Post by jukenorman on Nov 14, 2023 9:32:39 GMT
It certainly doesn't look easily repairable!
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Post by jukenorman on Nov 14, 2023 15:40:49 GMT
I also wondered whether you would be able to somehow fit a standard V4 roller lever micro switch there? Is there space for a small bracket to hold it?
Norman.
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Post by johan45 on Nov 14, 2023 20:38:37 GMT
I also wondered whether you would be able to somehow fit a standard V4 roller lever micro switch there? Is there space for a small bracket to hold it? Norman. Possibly? These are the brackets that held the actual switch. The long one bolts to the selector wheel. The switch is held between the two pieces with a couple of machine screws. tinypic.host/image/home-brackets.nZLSEI'm starting to think this has been broken for a while and someone bypassed the switch or I don't understand how it works. The wires were both soldered onto the same pad at the back of the switch. I don't see how the switch itself could interupt the power with that setup. The power totally bypasses the switch as far as I can tell. If that is the case then something else is stopping it from finishing its cycle. |
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Post by jukenorman on Nov 14, 2023 21:55:41 GMT
Yes I think you are not understanding - one side of the switch is at ground so it will simply be looped to one of the fixing screws. The two wires joined together, one likely goes to the wobble plate switch and the other to the scan/off/operate switch on route to the play control relay.
Norman.
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Post by johan45 on Nov 16, 2023 15:25:33 GMT
I may have found a switch, I have contacted many JB Repaimen and one guy says he has a switch for a 1493 Princess that might be the same. I'm waiting on pics but he's asking $100 US+ shipping, that's $150 CAD which seems rather steep.
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Post by jukenorman on Nov 16, 2023 17:05:17 GMT
The 1493 switch looks the same although it has a different part number from the 418 switch. 100USD does seem quite expensive especially considering there's a complete selector assy (with switch) on ebay for 50USD! I have a scrap 425 mech in my cellar - and I have to go down there tomorrow - which I think was the last R-O to use that type of switch. I'll take a look to see how easy I think it would be to fit a V4 roller micro switch.
Norman.
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Post by jukeboxmarty on Nov 16, 2023 17:05:27 GMT
I may have found a switch, I have contacted many JB Repaimen and one guy says he has a switch for a 1493 Princess that might be the same. I'm waiting on pics but he's asking $100 US+ shipping, that's $150 CAD which seems rather steep.
Wow, I wouldn't pay that much. Be a little patient. Many of these Rock-Ola's get parted out.
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Post by johan45 on Nov 16, 2023 20:06:38 GMT
I may have found a switch, I have contacted many JB Repaimen and one guy says he has a switch for a 1493 Princess that might be the same. I'm waiting on pics but he's asking $100 US+ shipping, that's $150 CAD which seems rather steep.
Wow, I wouldn't pay that much. Be a little patient. Many of these Rock-Ola's get parted out.
Thanks guys, I wasn't going to jump too fast for that kind of cash. I put feelers out to 30+ people from a list on always jukin I think. For that money I can use it as it. It still plays fine just doesn't finish the last selection. Here's a pic of a switch I found in the net it's missing the bottom part of the bracket but maybe this would help Norman tinypic.host/image/snap-switch.Hh8zQ |
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Post by jukenorman on Nov 17, 2023 11:31:06 GMT
It's just the cover that's missing as far as I can see and maybe the two nuts that hold it all together. It would be fairly easy to fit a V4 roller switch though which would probably be your cheapest option - just remove the existing switch and mount the V4 on a right angled bracket fixed where the switch was. Do you have Mouser in Canada?
Norman.
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Post by johan45 on Nov 17, 2023 14:37:10 GMT
It's just the cover that's missing as far as I can see and maybe the two nuts that hold it all together. It would be fairly easy to fit a V4 roller switch though which would probably be your cheapest option - just remove the existing switch and mount the V4 on a right angled bracket fixed where the switch was. Do you have Mouser in Canada? Norman. I do have access to Mouser. I have some some JB Weld here and am going to try putting the switch back together. What have I got to lose but some time. I just have to maintin contactwith the arms |
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Post by jukenorman on Nov 17, 2023 16:29:54 GMT
It's a delicate little snap acting switch, I would be surprised if you had success repairing it! 785-V7-1C17D8-207 is the Mouser part number for a Honeywell roller micro switch. Honeywell seem to refer to them as V7 switches (the Omron one that I have here is marked V4). Bear in mind also that if you are getting a used one from a Rock-Ola, it's going to be at least sixty years old. That Honeywell switch is only going to set you back a few dollars!
Norman.
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