Question about JVC AL A158BK Turntable

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JVC Turntable model AL A1 BKX , need to know how to adjust speed

Put on new turntable belt but sound from speakers shows the speed is too slow. Any corrections that can be made? Ca I get a layout of the proper belt setup?

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I have just fixed this problem on my Aiwa PX3800 with improvisation.
The platter was rotating too slowly, I didn't know how much too slow only that the records sounded wrong.
I imagined the belt, motor and platter as a bicycle gear and so simply increased the gear... I achieved this by winding a thin strip of a electrical insulation tape around the motor head to increase it's radius (like changing up to a larger front cog on a bicycle gear).
I could then time the rotations and remove a layer or two of the tape accordingly until I have achieved a perfect 45rpm. 33 is still way out but I only listen to 45s!
Be sure to trim excess tape from the motor head with a craft knife/scalpel or it'll stick to the platter.
Poor man fix up.

Posted on Dec 23, 2011

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After trying all the adjustments that I could by moving the drive motor around in the available slots I've concluded that my trouble now must be with the drive motor itself. I have clocked the RPM speed in both the 33 and 45 settings and they register well below their requirements. Looks like I will have to check out the motor or just bite the bullet and buy a new turntable as this one is quite old..
Thanks.

Posted on Dec 18, 2008

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More than likely your motor might be bad. There is nothing else that controls the speed. Are you sure you purchased the correct size belt? Turn on the unit, without connecting the belt, and touch the motor shaft, and see if it fluctuates. You can also just get a marker, and marker a point on the motor shaft. When you turn it on, it will act as a visual indication as to it's speed.

- Davis
DJ Pro Audio
www.DJPROLAB.com
www.DJPROAUDIO.com

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