Cartridge Wiring

5 replies
A(
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alexb1406 (archived)
Bronze
Posted February 18, 2010 at 09:37 GMT
#1756919

Can anyone tell me what the pin configuration is at the rear of the MMC series cartridges is.  I have just purchased another project and the enamelled copper wiring to the cartridge is all damaged and needs replacing.  The deck is a BG2200 and the cartridge is a MMC20E, though I guess all the MMC series are probably the same.

I can see 5 strands of wire at the turntable end, 2 for each channel (the two earths are joined together), and the 5th wire is connected to chassis ground.  Does this connect anywhere at the cartridge end?

M(
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Medogsfat (archived)
Bronze
Posted February 18, 2010 at 11:06 GMT
#1756920

Looking at the rear of the cartridge & going left to right the signal paths are :-

1. Ground Right

2, Right

3, Left

4, Ground Left

The turntable ground/earth wire goes to the cartridge body via the slotted hole at the bottom which accepts the spring clip.

Chris.

 

A(
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alexb1406 (archived)
Bronze
Posted February 18, 2010 at 11:50 GMT
#1756921

Thanks Chris.

This now gives me another problem as I am missing the spring clip and the screw to hold it onto the arm.  I assume the clip is held in place by the same screw that holds the cartridge mount?  Has anyone got any going spare?

M(
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Medogsfat (archived)
Bronze
Posted February 18, 2010 at 14:21 GMT
#1756922

There are 2 types of spring clip used with these cartridge mountings. One is a flat piece of copper & the other is a copper wire bent into a "diamond" shaped hoop (for want of a better description). I'm sure it is possible to make one if you can find some sprung copper - if memory serves me correctly the wire type was the better method.

Chris.

A(
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alexb1406 (archived)
Bronze
Posted February 18, 2010 at 16:12 GMT
#1756923

Ok, thanks, I'll have to improvise.  Presumably without it it may hum.

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