Question about Philips gemini TT-01 Turntable

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Speed Changes My turntable is not spinning at a constant speed. Its like theres something interfering with the spinning mechanism. At the fastest setting its still going too slow, and the speed varries on its own. You can hear it start to go slower and then speed up and go slow again. Any help would be very appreciated, thanks.

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Perhaps it's time to change the belt on your unit. If after you change the belt, you still have the same issue, then the problem might be with the motor itself. The motor itself is a relatively inexpensive part, around $20-30, and the labor should run in the 40min range - so you can get an idea of what it will cost. Hopefully it's an easy fix. Not sure where you could source the belt, but if you take off the old one, you should be able to match it up easily. Also, there should be a part number in the user manual, and instructions on ordering a replacement belt or at least a part number. FYI, belts generally run in the $5-15 range, and are user replaceable. Good Luck!

Posted on Sep 01, 2007

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1 Answer

How do I fix the speed of my Jensen JTA-460 turntable? I've tried numerous records that previously worked perfectly, but now the speed is too slow regardless of what album I try.


Could be the belt for the pulleys is stretched a little, or there is something making it slip, or the potentiometers were set incorrectly from the factory . It is normal to have one for each speed. It is unknown if you can access these from the bottom of the unit. Slippage is less likely to be caused by something oily, since it would alternate the speed faster and slower and yours seems to have worked then reached a constant slower speed. Do your 45's and 78's play ok? (yeah I know, does anyone have a lot of 78's on hand)
Your model does not have an outside pitch control to fine tune the speed faster or slower. Another Jensen model JTA-230 does. Entry level turntables such as yours are not speed accurate reliable. After reading reviews on your turntable, it's possible that the belt is the problem. If the slow speed problem had happened from the start, it would be safe to say that the speed wasn't calibrated correctly and you could have returned it and perhaps had better luck with another one but because it worked fine at the start and then now plays slower, it's either the belt or the potentiometer for the 33rpm speed has somehow changed.

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Constant speed


It needs to be taken apart. The bottom needs to be removed. Not an easy job if you are not mechanically inclined. There are pots inside that need to be sprayed with contact cleaner. Pots are under the knobs that control the speed. They have holes on the sides of them. You can purchase cleaner at a radio shack or electronic parts store or online.
Potentiometer Wikipedia the free encyclopedia

Apr 21, 2014 | Technics SL-1200 Turntable

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Clearly an electrical fault. Could be something to do with the power supply or the speed control circuit, or even the motor itself.
For the manual visit the Gemini website.

Apr 21, 2013 | Gemini PT-1000 II Turntable

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Possible that the motor is working with a different speed. It can be fault in the drive, fault in the mechanism.
What is required is the need to remove the TOP plate and look to see the drive of the motor. If there is slipping of the drive it can result in higher speed. If so it can be aligned and corrected.

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Our Technics SL-1200MK2 has issues with the direct drive. It does not spin at a constant speed. When stopped, it does not stop immediately. What can be done to solve this?


To adjust stopping speed you'll have to remove the plate by pulling it up. Then there is a plastic cover that has some screws, remove the screws and remove the plastic cover, you'll find a variable resistor that reads something like brake. Adjust it to the left or to the right with a screwdriver and see at which position works best.
To solve the constant speed problem you'll have to replace the pitch regulator.
Go to any panasonic/technics service and buy the pitch. If you have a bit of soldering skills you'll be able to replace it by yourself. You can access the pitch regulator unscrewing all the screws under the device and then removing the cover.
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May 18, 2011 | Technics SL-1200MK2 Turntable

2 Answers

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It is likely that grease has hardened and as the gears rotate that grease is interfering with normal operation. Take the unit apart and have a look at the drive mechanism, if there is something in the gears you should be able to see it.

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1 Answer

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Well, does the platter spin at a constant speed (33 or 45 rpm), or does it spin super fast? If it spins at a constant speed, and it just wont stop, replacing that pot should do the trick (VR201 can be purchased HERE). You can attempt to replace it yourself (soldering skills are required), or just buy the part, and have a service tech replace it for you.

If it does not solve the problem, then the issue is with one of the IC's (integrated circuits). This is a more complex diagnosis and repair. But try replacing VR201 first, then taking it from there.

Good luck!

- TERMiNAL OPTiC
www.DJPROLAB.com

Mar 03, 2008 | Technics SL-1200 Turntable

1 Answer

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Check that your voltage settings are set correctly. This is located underneath your turntable platter. If you remove the slipmat, you will see 2 holes on the metal platter. Rotate the platter till you see the voltage switch, located @ the 9'o'clock position. Make sure it's set to your correct settings (N.America = 115V / Euro = 220V). If not, you will need a flat head screw driver to switch it. Before you switch it, make sure your unit is off and unplugged. After you swich it, it should be ok.

If your still having issues with the speed and the pop-up light, then there is something seriously wrong, and will need to be checked by a technician. Sometimes a resistor or IC will go bad, causing the speed issue, but for the pop-up light - that's usually faulty wiring generally caused by an incorrect replacement.

Did you buy this new or used? Have you had this serviced recently?

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