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Post by e093116 on Feb 14, 2017 21:01:30 GMT
I have a 340 cartridge from an LS2 which I've determined to only have mono output. Wondering if there is a way to repair/rebuild to restore stereo operation? Thank you.
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Post by Ron Rich on Feb 15, 2017 2:48:59 GMT
How, have you "determined" this ?? Ron Rich
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Post by e093116 on Feb 15, 2017 12:00:32 GMT
Noticed that I had no input signal coming to the amp on the left channel. I did check the amp and confirmed that both inputs were working properly.
Checked the wiring, expecting to find an open circuit, no problems found.
Cleaned the 4 contacts on the cartridge, tried again, no improvement.
Tried a second cartridge from a different machine, magically there was now a signal on both channels. I concluded that the removed cartridge was the cause of the problem. I used the same set of needles on both cartridges.
Hoping to save the suspect cartridge since I don't have a spare and replacements are close to cost prohibitive!... |
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Post by robnyc on Feb 15, 2017 14:57:06 GMT
Hello again, that is such a common cartridge in the Seeburg line used from 1966 till 1986. I suggest looking up jukebox operators in your area and see if that have a spare.
RobNYC
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Post by Ron Rich on Feb 15, 2017 15:14:45 GMT
Although possible, I am not sure it really is the cartridge that is causing the problem. Often the cartridge socket is at fault in a case like this. If you have a meter, measure across the two coils directly on the cart. pins. If either coil is open--yep-bad cartridge. If you do not have a meter, install the suspected bad unit in the other phono, to check it.
If bad, I would check with the parts sellers listed here, above, in FAQ's, for another cartridge. Ron Rich
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Post by e093116 on Feb 17, 2017 14:29:48 GMT
Minor update. Measured ~440 ohm across one coil and ~2 Mohm across the other side on the suspected bad cartridge.
Pulled cartridges on two other project machines, coils measured in the 440-460 ohm range. At least those are good.
The bad coil doesn't appear to be burned up, at some point I'll try to drive the steel pin out of the bad cartridge, "split the cases", and hopefully find something simple like a broken wire needing reattachment. At this point I don't have much to lose, and will keep an eye out for a reasonably priced replacement in the mean time. |
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