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Post by viperz on May 2, 2021 21:30:28 GMT
The tube shock mount is soft, I have not changed that. The board is also mounted on four shock mounts of its own.
Turntable motor mounts are new.
I'll keep playing with it, but not sure how much time I want to spend chasing this one.
Just cannot wait to install pilasters and new needle, and just use this machine...
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Post by viperz on May 4, 2021 21:45:59 GMT
stupid question - should the four transport bolts be completely loose, or should the be partially screwed into the mech?
Thank you.
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Post by Ron Rich on May 4, 2021 22:34:01 GMT
Hi Eugen,
If captive wing screws like on other models-- all the way dis-connected--"captured" sitting there for play. Ron Rich
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Post by viperz on May 4, 2021 23:12:22 GMT
Sorry, Ron, how do you capture them? Yes, they are winged screws screwed from the bottom. They were fully dangling, and I screwed them in a couple of turns each. Is that the right way? Thank you
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Post by Ron Rich on May 4, 2021 23:21:32 GMT
Eugen,
Iffin they are "dangling"-- they are captured-- they can't fall out, can they ? Ron Rich
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Post by viperz on May 5, 2021 1:58:05 GMT
Correct, they do not fall out  |
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Post by viperz on May 5, 2021 18:37:13 GMT
Undid the bolts, feedback from turntable motor is very slightly lower. Tried swapping original US GE 12AU7 tube with new $50 Genalex 12AU7 - no change. Next thing I want to try is install a power filter in front of the jukebox, just to see if it will do anything. Power in my house sucks..
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Post by viperz on May 6, 2021 21:01:15 GMT
Stamann has shipped new extrusions, rubber U-channel for pilaster and cartridge... woohoo
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Post by Ron Rich on May 6, 2021 23:03:06 GMT
They are great people !!--- well, not so sure about Oliver ?? Ron Rich
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Post by viperz on May 21, 2021 20:51:36 GMT
Been playing this jukebox once in a blue moon. Found one bad thing, which I know that I have caused. When fully cold after several days of not using, I turn on the jukebox, make selection, and it blows 400mA slow-blow fuse. This SB fuse is providing 28VDC to pretty much timing relays 1 and 2.
I suspect swap of selenium rectifier to silicone diodes is probably the route cause. Selenium rectifier has very high resistance when cold, silicone diodes obviously have very low resistance. I used to put some equivalent power resistor when swapping selenium rectifiers previously, but I haven't done it for a while.
Just wondering if this is something common? After first run, jukebox can work for hours and days with no issues.
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Post by Ron Rich on May 21, 2021 21:28:56 GMT
Hi Eugen,
I have never experienced such-- but have heard this before. If it's a "sloblo" fuse, you might try another brand fuse--
Ron Rich
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Post by viperz on May 21, 2021 22:36:46 GMT
Ron, my apologies, I think I misread the schematic. The fuse is on the junction box, so when I trace the block diagram, it is on 24VAC rail, not on 24VDC. You might be right about bad fuses. I looked at blow curves for two different 3AG slow-blow fuses, and they are very different. This is strange, as 3AG is supposed to follow a specific standard. The fuse is in top left corner of the attached diagram: photos.app.goo.gl/RNw4a7oXmtKWxtK68 |
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Post by Ron Rich on May 22, 2021 2:41:00 GMT
Eugen,
As far as I know --"3AG" is the physical size of a fuse-- Buss brand, are marked "MDL" if slow blowing, while Littlefuse brand, are marked 313.
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Post by viperz on May 22, 2021 20:41:26 GMT
Yes, I have the MDL 0.4A fuse in there right now. Turned it on again this morning - no issues. Looking at 24VAC bus - the selector pulse goes through contacts on timing relay 1 an 2. Also a set of contacts on TR1 controls the coil of TR2. So when TR1 relaxes, TR2 will also relax after a short delay, thus breaking the circuit to the selector coils. I am not sure if contact spacing on TR1 and TR2 would make any difference, but maybe TR2 is sticking a little bit, thus borderline blowing fuse after magnet has been untouched for several days?
I am honestly thinking about just bumping up to 500mA slow-blow fuse to avoid this from happening ever again.
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Post by Ron Rich on May 22, 2021 21:51:17 GMT
Eugen,
Are you sure about this being AC ? AC relays usually do not get magnetized --- I would check the contacts on the relays, for pits/burns --- I also might "up" the fuse--but I am leery about doing so as most jukebox makers used a fuse that was MAX for the purpose---
For magnetized items, my solution is a very thin piece of Mylar tape, the type farmer's use to scare birds away,glued to the point of the magnetic connection-- Ron Rich
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