Sony PS-LX250H Turntable Logo

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Posted on Sep 08, 2007
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Speed After working well for quite a while, the turntable runs at about 40 rpm's instead of 33 1/3. I reinstalled the drive belt but that didn't work.

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  • Expert 515 Answers
  • Posted on Sep 23, 2007
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Joined: Sep 01, 2007
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The motor for the unit might be dying out. There really aren't any other factors that control the speed/rpm of these belt driven models. So if the belt didn't do the trick, you will have to take it to a service center to test the motor.

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My Fisher MC-723 turntable is spinning very slowly on 45 rpm. I'm unable to play any of my 45s. Not sure if I need to replace the belt.

I totally agree Andrew, of all the turntables we have repaired over the last 40 years I've never seen a belt cause one speed to not work, according to the manual this lists a replacement belt, I was thinking the same thing you were, this is an electronic issue, generally there is a resistor or capacitor that slows the motor down for 33 rpm, it runs at full speed on 45, I've also seen an actual variable voltage motor although that's not common,so the theory of it being an electronic issue seems strange as well. If it actually has a belt I'd look for something miss aligned, where it's not moving the retainer all the way over for 45 RPM. This is kind of a hard one to diagnose without seeing the unit
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It depends if these are belt or direct drive decks. If they are belt, then in the first fast speed one the belt might have slipped and is now on the 45 setting when it should be on the 33 setting.

The other deck has either a really **** belt, or a bad motor, or needs oiling or having grease or muck removed from it's works.


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All turntables have a button or switch that will select that speed. If that doesn't work, you have either replaced the belt wrong - on a belt drive model, or you have an electrical fault on a Direct Drive type.
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Why is this turntable running slow?

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Direct drive turntables are more difficult. As it could be any number of faulty parts that cause it.
A build up of grease or dirt in any type of deck can slow the speed down.

A faulty motor on both types of deck will also cause it.
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Not sure I understand what you need done. The 1200 has a pitch control, which allows you to control it's speed. Do you want to disable the 33/45rpm function, and assign that to the pitch control, so instead of controlling pitch, you control the RPM? This will put quite a strain on the drive circuits of this unit, but it can be done. Although, not an easy modification, as you will have to modify multiple resistors and IC's on the main board. This should only be professionally done.

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