During my sets I seem to be experiencing what seems like slight shift changing. For ex: I can find and match the beats at the beginning of my tracks, but towards the end I find that the beats are off and I have to re-match. I don't know if it could be the way the record was made or if it could be a turntable problem. My turntables are no more than a year old. I have a little over six years djing experience so I know how to find and match my beats. What do you think?
Some records that have centre hole too large can cause drift if record loose when placed on platter try small bit of paper between hole and spindle centre shaft ,if no drift then you know your deck isnt needing repaired ;)
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Re: sudden pitch change.
There is a speed control IC inside this unit that could be defective or the speed detect sensors could be faulty. WIthout seeing the actual machine it is hard to tell. This one is a direct drive if memory serves me correctly, so you should not have this kind of drift. With the unit only a year old, I would not expect a motor problem either. Can you tell if the drift is toward higher speed or lower? Or does it vary?
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Register (free) at Vinyl Engine and download the service manual. The adjustment you need to do seems fairly simple. You will need a turntable strobe disk to get the the speed right, unless you have perfect pitch.
This seems to be a pitch control issue. controller,
replacing \t,could be worn over time,
SL1200 Technics - if you want a solid long lasting excellence of sound reproduction for many years to come,
I had the same pitch control issue,
happened on one of my decks so I replaced the controller and good to go from there,
Another important tip -
never lubricate the controls sliders with any thing apart from the correct greases or oils applied by the manufactuer,most people dont think of the damage caused by the cleaners they use ,some aerosols eat away the fine oil that lubricates the pitch control sliders making them dry and brittle eventually cracking producing odd random performance issues,
I'm having a similar problem with my denon dp-300f. It seems to *ever so slightly* increase or decrease in speed (and therefore pitch)...I might not even notice it very often if I wasn't listening to my favorites. I have not found a solution to this problem, but my hunch is related to the power source. Meaning: I think the voltage output by my apartment is slightly sagging (<120V, AC ~60Hz...which most appliances can deal with) and this affects the speed of the motor that drives the belt. I'm looking into isolating this factor. I'll let you know.
It could be a belt problem...it could also be a
line voltage problem from the ac coming out of the wall if your record player motor is not syncronous...I remember as a boy some of the cheap little record players I had would change pitch at different times during the day, based on the line voltage varying a little bit coming from the wall plug...
Check to see if your player motor is "syncronous" or some such word....
more than likely it is a mechanical problem...
regarding the physics of how the turntable is driven....
I have the same exact problem with one of my 1210 MK2 turntables. It seems like the motor is too slow now. When I hit the start button or release the record, it takes much longer to speed up to the normal speed than my other same exact turntable. I don't think it has anything to do with the pitch slider. Please let me know if you find out what the problem is thanks!
You have to understand any sort of calibration meter will only tell you if the pitch control is faulty - or excessively too fast/too slow. If your units are just 'off' then that is a matter of a simple calibration of your pitch controls back to original factory specs. Also, just so you know, the pitch controls on the 1200s are not really calibrated when they leave the factory. They are basically installed, set a default setting, then shipped off. So, you'll often times have 2 turntables with sequential serial numbers, but they are both off.