Question about Technics SL-1200 Turntable

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The turntable loses its speed

My problem starts since i realised i had a burnt lamp near the plate and wanted to fix it. after i replaced the little lamp next to the plate i reassembled the turntable and i turn it on... so far so good, all lights are on and i am satisfied with the result. i press the start button and the plate starts spinning but i notice that the lamps are dimmer-ing on and off giving low voltage or smt like that. i put a record on and the record sounds like someone is playing with the pitch constantly. i reverse the rotation of the plate with my hand and i find no resistance at all as opposed to other times where there was a strong force going on the other direction. now what i can guess is that the magnets or a portion of them are off! am i right or what seems to be the problem? how can i fi this? is it possible to be fixed by me or is it a specialists duty? thanks a lot in advance for the response!...

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  • Anonymous Apr 24, 2009

    fact is that the wires of the lamp did touch a metal plate and there was a current through. there were some sparks and then nothing. after i switched it on i had the result i described in the previous post. nevertheless i disconnected the lamp and switched it on and had the same result. so i did something wrong there. what needs to be done?

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  • Master
  • 8,546 Answers

Perhaps you should retrace your own lamp repair steps. Did you tamper with anything electrical? It seems likely you touched something inadvertently.

Posted on Apr 24, 2009

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How to tweak the playback speed on Panasonic SL-HM42 turntables
recently-purchased-used-panasonic-sl-jxgmd5u3zcskalhaccgps5fw-3-20.png

You will need:

  1. 1x small Philips screw driver
  2. 1x small flat-head screw driver
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Step 1 - Remove the wooden base plate

After ensuring that you've removed the the rubber turntable slip mat and securely docked the turntable arm, carefully flip the turntable over onto its lid to expose the wooden base plate, as per below.

Using the small Philips-head screw driver, remove the screws holding the wooden base plate in place, then gently lift the base plate off the turntable.

recently-purchased-used-panasonic-sl-jxgmd5u3zcskalhaccgps5fw-3-26.png

Step 2 - Expose the pitch adjustment screws

Once the wooden base plate is removed, you will see the speed-controller circuit board on the right-hand side.
recently-purchased-used-panasonic-sl-jxgmd5u3zcskalhaccgps5fw-3-50.png

To expose the the two speed/pitch-control screws, firstly remove the screw holding the speed-controller circuit board in place, then gently lift the circuit board up on the free side.
recently-purchased-used-panasonic-sl-jxgmd5u3zcskalhaccgps5fw-3-41.png

Step 3 - Correct the turntable playback speed and pitch

The easiest way I found to correct the playback speed was to flip the turntable carefully back into the original position, allowing the speed-controller circuit board to hang free as shown below.

recently-purchased-used-panasonic-sl-jxgmd5u3zcskalhaccgps5fw-3-60.png

Next, play a record that you know well and are able to tell when the speed/pitch is correct (assuming you have an ear for correct pitch, that is!), then at the same time using the small flat-head screwdriver, gently turn the speed adjustment screw(s) to adjust the playback speed up or down until the correct playback speed and pitch is achieved (or at least until it no longer annoys you ;).

Turning the screws clockwise (to the right) will increase the speed/pitch, and anticlockwise (to the left) will decrease the speed/pitch.

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Step 4 - Reassemble the turntable again

When you're happy with the speed of your turntable, remove the record, the mat again & locking the turntable arm, replace the screw holding the speed-controller circuit in place (as per Step 2) and then finally replace the screws holding the wooden base plate, as per Step 1.
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