Question about Sony PS-LX250H Turntable

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Uneven speeds I am getting uneven speeds - speeds up then slows down at unpredictable times. Could it be the belt?

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  • es238906 Aug 06, 2008

    I have had this turntable for about four years now and I am having a multitude of problems. The drive belt consistently comes loose which makes playing records difficult (the needle refuses to stay on the record and it shuts off), also it speeds up and slows down during play, completely distorting the sound.

    I have gone through the steps to fix the drive belt that are offered on the sony website a multitude of times, yet I fear that it may need to be replaced.


  • Anonymous Jan 04, 2009

    Belt looks ok, tryed adjusting motor helped alittle but sound varies..it sounds like its motor speed.I even put a rubber band on replacing the belt just to see if it would make any difference..not really..Sounds almost like its surging..but not consistant...????

    ..,

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Belt came loose please help[

Posted on Jun 28, 2008

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Posted on Jan 02, 2017

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1 Answer

Slows Down and Then Speeds Up


It probably has to do with the belt overheating the motor and irritating your controller. Try replacing the walking belt.

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I have a proform 740CS, it sometimes slows way down, if I step off it will sometimes speed up much faster than what it's set at, but then slows down again when I step back on. Other times, it remains...


Please LUBE very well the Walking Belt.
2) Inspect the drive belt motor, if is loose, Retight.
3) See if there loose wires for MOTOR.and retight.
4) The walking belt LIFT wiht your finger must be 2-3"
otherwise Readjust with the allen screw rear.
Blessing.
cuadra2016@yandex.com
cell+whatsAPP:+50588611441
How To Lubricate Treadmill

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1 Answer

My treadmill is a proform 345s crosswalk. It doesn't keep a constant rate. This just began this morning. It speeds up then slows down and it's impossible to exercise with the variance. What's going on?


You may have a belt and deck problem. Test by the following procedure: without the power on stand on the walking belt, push the belt in the direction it normally turns, if the belt is very difficult to turn (on most treadmill) this means that you have high belt/deck friction. Apply silicone lubricant between belt and deck beginning laterally at the motor shroud to end of the rear roller on each side
The deck should be smooth without any grooves, pits, or exposed wood. The belt should have a consistent ridged feel from one side of the belt to the other (a belt can be worn out without any sensory signs of a problem). If you feel deep grooves in the deck or uneven wear on the underside of the belt, part replacement is necessary. Visually look at the underside of the belt. It should have a consistent look. Black streaks in the belt are a sign of bottom-layer wear through. Very worn belts will feel smooth in the areas you normally walk- you would think smooth is good but not in belts because the smoother the belt, the more contact area. On occasion, you may have already damaged the DC board if you have high belt/deck friction. If the belt walks freely, you have a different problem. 2. If it passes the belt/deck checks, you may have a DC board output problem. If the belt tests ok and you have a speed variation, try this test:
Set the speed to 2.5 MPH. Let the treadmill run without anyone on the belt. Check to see if the speed is constant or if there is a variation.
If there is no variation, step on the belt. If the speed slows down or speeds up, you may have an output problem on the DC board. This is the board that connects directly to the motor.
You may have a short in the motor. If you turn the machine on and have erratic speed, you could have a problem in the DC board or the motor or both. With a simple multi-meter, you can test on the continuity scale to see if you have a closed circuit between either DC motor lead and the common earth ground. You should always have an open circuit.
You may have a speed signal problem. Your controls on the upper panel send a signal to the lower electronics to help them set the appropriate speed. If there is a problem in the signal generator, the communication links, or in the feedback links, you will have erratic speed operation.
Communications test- Look on the board for a flashing signal as you increase speed on the treadmill. Most boards have a signal feedback test light. If a LED flashes, your communication is ok.
Feedback test- If your unit is equipped with an optical feedback (disk inside a sensor) you can swap the feedback unit with the incline (it is the same part on many Icon machines). If it tests ok, you don’t have a problem here. If it is a magnetic feedback unit, you can test continuity with a multi meter or replace with a new part to test. Many times passing a kitchen magnet in front of the signal will make a speed display on the console if the magnetic sensor is good.
Signal Generator- If you have a problem with the signal generator, your speed will be erratic with either a person on the machine or without a person on the machine. You may even get a speed error code from the unit.

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Hey Doug,

Just wondering has this unit ever had the running deck flipped over if not this may be sighs of worn deck or belt or both! What is starting to happen is that at the higher speed the unit is starting to draw more current, so the motrol control board will sense this and will shut down so it won't damage either the motor or board. What starts as an occassional shut down will progressively become more frequent. Simple test is put your hand palm down between the belt and deck,if you feel uneven ridges then the deck needs to be flipped over and when you pull out your hand out and their is a black sooty film on the back of it ,then that seals it this means that the composite material is being shaved off. Most likely the belt will have a smooth glazed feeling in the middle part of it. and well also need replacing.

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1 Answer

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