Hi I have an old JVC AL-E300 system turntable that has decided to stop
working correctly and have tried altering the speed underneath but to
no avail. It plays too fast then eventually slow to a stop. Any ideas?
I've had the belt changed today but to know avail. Kind regards.
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Re: JVC AL-E300 Turntable
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.
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Does it restart if you manually lift the arm up?
If it does then you might have not put the belt on right. Another reason is that the problem was not the belt, but a motor showing the signs that it wasn't coping when under load. This could be caused by grease or muck inside the motor or in the drive functions. However the motor could be faulty.
SINCE I DON'T HAVE THE TURNTABLE IN FRONT OF ME AND NOT BEING FAMILIAR WITH THIS PARTICULAR TURNTABLE, I CAN GIVE AN EDUCATED GUESS. WITHOUT GETTING INTO THE CONFUSING ELECTRONIC SPECIFICS, ABOUT PREAMPS, ETC. REMOVE THE TURNTABLE PLATTER. UNDERNEATH IT, IF I'M CORRECT, THERE SHOULD BE A SLIDE SWITCH. IF THERE IS, SLIDE TO THE OTHER POSITION FROM WHERE IT IS CURRENTLY. PUT THE PLATTER BACK ON, TURN ON YOUR SYSTEM AND SEE IF THAT SOLVES YOUR PROBLEM. IF NOT, YOU MAY NEED TO BUY A PREAMP FOR YOUR TURNTABLE. HOPE THIS SUGGESTION HELPS
Even if the belt looks fine it's almost certainly the problem. You mentioned "cleaning" - if you got any kind of fluid on the belt it might act as a lubricant and reduce the friction between the belt and the drive wheel, causing the turntable to slow when the tone arm puts a drag on it. The problem may go away when the belt dries out.
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.
I had this problem. In my case it manifested itself mostly in start-up, and I found that I had to move the tonearm past the 1st track to get the TT to spin. I cleaned the contacts on the micro-switch (on the mechanism, from below) with extra-fine sandpaper. It worked.