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Post by Ron Rich on Oct 6, 2020 16:43:11 GMT
Hi Eugen,
That looks "very normal" for the record lay down on this model -- as far as I know, there is no adjustment for this. I have shimmed the cam with a "wave washer" on some that really "slap down" the records. What is that awful noise I hear on record pick-up ? That's NOT "normal" ! Ron Rich
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Post by viperz on Oct 7, 2020 3:10:58 GMT
I knew someone would pick on that noise  that was me pushing buttons and the button solenoid engaging. Thank you for confirming the motion. I checked all gears and mechanisms. Yes, I can probably clean them better, but I didn't see anything visibly worn, damaged or getting stuck. |
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Post by Ron Rich on Oct 7, 2020 12:58:45 GMT
Hi Eugen,
OK-- NOW, I recognize that sound-- had me stumped as it "sounded right", but not correct for that time period. Thanks ! Ron Rich
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Post by viperz on Oct 30, 2020 23:50:51 GMT
One thing I am going to do to this machine next is cut a nice ring out of thin felt material and glue it where the worn outer rubber ring is on the turntable platter. Is this something common that people do?
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Post by Ron Rich on Oct 31, 2020 2:43:27 GMT
Hi Eugen,
I think not-- they usually replace the ring--- Ron Rich
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Post by viperz on Oct 31, 2020 3:35:16 GMT
Ron, I do not see how to replace the ring on this platter. It seems like it has been glued originally? It is hard to guess because it is so worn (I can see metal where it is completely worn). Also, where do people get these rings? Thank you.
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Post by Ron Rich on Oct 31, 2020 13:15:58 GMT
Eugen,
I have removed them with boiling hot water. Same places as all partz come from-- the partz fairy brings them in the middle of the knight ! (Any one of the suppliers, listed in our FAQ's section) Ron Rich
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Post by viperz on Oct 31, 2020 15:58:19 GMT
I wish I had a fairy like that! I checked with a couple of North American suppliers, they don't have them listed. Will keep looking.
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Post by viperz on Mar 31, 2021 21:42:28 GMT
While I am waiting for parts for my Wurlitzer, I decided to change twin-diode Selenium rectifier in this CMM1 jukebox. It is a very crude rectifier for 30VDC - one diode on each side of transformer winding, then RC ripple filter after it. "DC" is protected by 2.8A SB fuse. So I should be looking for 100V 5A or so diodes.
One thing I do not understand - the schematic shows green wire from the power plug connected to the center bolt of this rectifier. Rectifier is sitting on the chassis, so effectively its center bolt is grounded this way. When I will install two new diodes, I will just connect anode of each rectifier to each side of 30VAC winding, then connect cathodes together for the output to RC filter. I think that's all that's needed?
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Post by viperz on Apr 1, 2021 0:50:53 GMT
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Post by jukenorman on Apr 1, 2021 8:32:09 GMT
Hi Eugen,
It is a full wave rectifier, only two diodes required since they are fed from a centre tapped transformer secondary winding. You should also consider installing a fuse between transformer and silicon diodes (or relocating the fuse that is normally on the output side of the selenium rectifier) to protect the transformer should a silicon diode go short circuit.
Norman
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Post by viperz on Apr 1, 2021 16:46:08 GMT
Understand, thank you, Norman.
Funny thing is that I used 6A/1000V military-grade diodes lol (leftovers from my previous life). Technically, they should never fail in 2A/30V application.
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that was me pushing buttons and the button solenoid engaging.