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Post by gazzy58 on May 2, 2022 14:20:23 GMT
I am slowly working through my recent purchase of a Rockola 1428 to try and get it going again after many years in storage. Still a long way to go, but have managed to get it selecting. A couple of issues I would like to resolve if anyone can offer some help/advice. First up the main mechanism motor is only lasting a few selections before starting to smoke. The thermal protector cuts in and switches itself off. When cooled down I can manage to get the stuck record back in its tray. I have already stripped, cleaned and lubed the motor but seems to have made no difference. There is no over tension on the drive belt. All areas that should be lubed have been done (unless I have overlooked some). I am just wondering if the motor either needs replaced or rewound. After all this motor is 74 years old and looks like it had never been out or opened since leaving the factory. Perhaps someone can suggest a supplier or someone has a spare for sale or does anyone know if anybody in the UK can rebuild/rewind these motors? Second issue is that once all selections have been played the mech keeps playing the last record (at the bottom of the stack) over and over until I switch the machine off at the mains. I have the service manual which covers the 1422, 1426 and the 1428, but its not very comprehensive. Perhaps I should invest in the troubleshooting guide. Is there a better manual available which has the schematics in it?
Thanks
Gary
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Post by Ron Rich on May 2, 2022 17:02:19 GMT
Hi Gary,
Here in the USA, there are local "Small Motor Repair Shops" in almost every large city, that can, and will rewind that motor-- when they are doing the smoke thing-- do not run them any more as once you let the smoke all out-it ainna gonna work, no more ( see our "off topic" section for further info ) ! There is a shut-off switch located down low-Going from my great, but not too long memory-- seems it's held on by the selector--somehow ? As for parts suppliers-- check the FAQ's section-- there are several listed for the UK-- also check the Netherlands, and Germany listings. Ron Rich
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Post by gazzy58 on May 2, 2022 17:31:38 GMT
Hi Ron, flicking through the manual, there is a section I must have missed which suggests a possible reason for the motor overloading is that the worm gear is too tight against the main cam and binding. There is an adjustment for this, so I will have a look tomorrow and report back.
Thanks
Gary
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Post by jukenorman on May 2, 2022 18:13:05 GMT
Alternatively you could run the motor disconnected from the mechanism. If it then gets hot in no load conditions, there would be no doubt that there's a problem!
Norman.
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Post by Ron Rich on May 2, 2022 18:55:03 GMT
Norman & all,
"motors" do run hot, normally ! Most motor makers marked a temp rise on the motor ID tag. If getting above that number, with zero load, it has shorted windings ! As for a "bind"-- sure possible ! I would run that motor with no load and measure it with an amp meter-- then run it with a correct load-- should not go too much higher--also-- have you properly oiled that motor & mech lately-- that may make a big difference in the motor "load" too-- Ron Rich
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Post by jukenorman on May 2, 2022 19:24:52 GMT
Yes Ron I agree, I would also connect an ammeter to measure current draw - that is also normally marked on the ID tag.
Norman.
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Post by gazzy58 on May 3, 2022 8:36:09 GMT
Hi Norman and Ron, I have checked and there is no binding at the worm gear. The motor seems to be running quieter now that I have stripped, lubed and cleaned it, but there is certainly still binding somewhere, just got to figure out where. There appears to be excess noise coming from the rod that goes up through the turntable motor and lifts the records up. It says in the manual to polish this rod and check for any burrs. I will try that and see what happens. It is also very slow to bring the record trays out and back. I thought I had oiled all the areas I was supposed to, but obviously not. I am hoping someone in the forum who owns this particular model can point me in the right direction. Maybe they have experienced similar problems.
Thanks
Gary
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Post by Ron Rich on May 3, 2022 12:04:51 GMT
Hi Gary,
From what I can re-call, I think that as long as it gets the trays out before the turntable starts up--it's "normal". ( I may have this confused with a WurliTzer's operation ??) I have used crocus cloth on the turn table shaft-- then a coating of 20 wt oil-- HTH Ron Rich
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