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Quartz accuracy not accurate

I have a Gemini Xl-1800 turntable. When I put the unit into quartz lock via pitch control slider, according to the platters strobe rpm meter it's running slow. Have to move the pitch slider and speed it up to make the dots appear stationary.. At 33rpm it needs to me moved ahead 1% and at 45 its 2%


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  • Audio Player... Master
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Sometimes it's down to the mains in the country you are in. Some decks change speed from 50HZ to 60HZ.

Posted on Dec 09, 2017


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Posted on Jan 02, 2017

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SOURCE: speed

The drive circuits on this unit are probably failing. Have you had any service done to it recently, or at all, ever? If so, this might be the problem. The caps have probably dried out. Once they dry out, they go pretty fast afterwards causing variance in speed. A good tech should be able to replace the caps, and get your unit back to original specs.

- Davis
DJ Pro Audio

Posted on Aug 08, 2008

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SOURCE: Pitch control not working on Numark Pro-TT2
here u go matey

Posted on Aug 09, 2009

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I own a numark tt100 dj turntable i have a issue with the pitch my pitch slider is in the middle where it should be but the dots on the platter dont line up with the light

First things first, I presume you know that there's four pitch rings around the edge of the platter; one per RPM. So only one should be static when viewed by the synchronised light.

Second, there is a pitch fine tune control on top of the strobe light. Is that centralised? Presuming that you've checked the basics first, then it's time to look at maintenance issues, then faults/repairs.

If you're lucky then it could be something as simple as the motor spindle needing a couple of drops of oil. If the deck is from a very dusty environment then it may even need the motor spindle cleaning of accumulated dust and crud.

Anything beyond this is drag due to a bent spindle.

Oct 19, 2014 | Numark Audio Players & Recorders

1 Answer

Pitch adjustment

There's a variable resistor with the name pitch besides it... first clean it and then you put your pitch fader in the middle and turn it with a screw driver, put your platter on the unit, the plastic black plate you only have to unscrew and take off , nothing else., but like i said , but the platter on it and watch the strobe lights. Determine first which way you have to screw, it's just whole the time :taking of platter and turn screw a bit(don't forget to take of the electricity when you remove the platter), put it on and do that until the strobe stays steady.
greetings richard

Jan 12, 2014 | Technics Audio Players & Recorders

1 Answer

There is power going through my technics 1210,but the platter & strobe light still will not work

how do you know theres power to the unit if theirs no strobe light pitch adjuster light & the platter doesn't spin?
the power comes in & to the transformer first,then through the strobe switch, the transformer is what blows when you short the target light out.....i've seen this many a time when people try & change the target lights to blue neon.

Mar 04, 2013 | Technics SL-1210 Turntable

1 Answer

I own a SL1200 MKII and when the light "turn on" in the pitch control slider (green LED) the speed is not correct (big dots on platter move slightly) .Could you please give me some tips to solve...

Use the slide on the pitch control to move forward or backward until the dots stay steady. If it is a little old the quartz control won't work as well.

May 13, 2011 | Technics SL-1200 Turntable

1 Answer

One of my turntables is spinning out of control, no reaction to pitch or RPM changes. What could this be?

Sounds like the motor control circuitry has a fault, beyond the effects of maintenance adjustments. Quite often, a transistor and perhaps other active electronic components are used to provide a stable calibrated voltage that drives the platter motor. If one of these components fails, the drive motor can be fed the larger unregulated supply voltage; hence, the out of control platter speed. This can happen to belt drive or direct drive turntables. Not so with the old rim drive units. Unless you have technical experience in this area, you should have a stereo type tech look at it. I'd avoid the high end audiophile type repair services. Shop around for an old school regular tech, and the repair should be relatively inexpensive. FYI, I've seen these hi end shops charge $50 or $60 for a turntable belt that should only cost around $20. If you feel the repair estimate is too much, you can find good used turntables at some stereo stores, or even at some thrift shops for a fraction of replacement cost. Depends on your standards.

Oct 06, 2010 | Gemini XL-400II Turntable

1 Answer

Why Fry - 220 or 110 ????

You should be fine with this. Here is the spec:

Quartz lock large blue LCD display showing: speed, pitch & platter direction, locking platter reverse button, located in battle position, 3-speed design: 33, 45 & 78 RPM, 7 grams of anti-skate adjustment, adjustable pitch control+= 10 & pitch bend buttons, locking reverse button, hi-tech tone arm with height adjustment, feather-touch start/ stop control, strobe illuminator, pop-up target light, headshell, slipmat and dustcover included . 115V/230V switchable. 17.75"w x 6"h x 14"d. Weight:27lbs.

Jul 18, 2010 | Gemini PT-2410 Turntable

1 Answer

How to calibrate control on a technic 1200 by sight

Put the pitch slider to +6 and adjust the internal preset until the top set of dots on the platter are stationary.
Check again with the pitch at +3.3 if the dots are stationary then job done!, if not then the pitch slider is worn and perfect calibration won't be possible until the pitch slider is replaced.

Jul 14, 2010 | Technics SL-1200 Turntable

1 Answer

Pitch and Strobes

There is nothing wrong with your turntables. The Strobe dots are only a guide to give you an idea of the speed your platter is rotating. Nothing more, nothing less. The pitch control decal is not 100% accurate, it is simply a guide to tell you where the 6% position lies, 3.3%, etc.

As long as the quartz lock function works, and the large middle strobes are nice and solid, and do not move, your fine.

You can check out these videos for more insight into these wonderful turntables:

- Optic
Digital Analog Therapy

Sep 19, 2008 | Technics SL-1200MK5 Turntable

1 Answer

Gemini xl 500

on top of the pitch control there is a small hole, in this hole you can use a small screw driver  and turn it left and right to free any dirt inside this is the master pitch control

Aug 10, 2008 | Gemini XL-500 Turntable

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