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Anonymous Posted on Aug 29, 2013

Recently purchased used Panasonic SL-HM42 turntable. Works, but turning a little slow on 33rpm (30-31rpms) says DC Servo System on the front. Don't see any set screws on bottom. would like to get platter off to check belt, maybe clean, but can't figure out how. After removing mat, no holes in platter to grab, no clip on spindle to remove, doesn't lift up. If you can't tell, I don't really know much!

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  • Posted on Oct 30, 2014
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How to tweak the playback speed on Panasonic SL-HM42 turntables
Recently purchased used Panasonic SL-HM42 - 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
  3. An ear for correct pitch and a little bit of DIY skill!

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.



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 Recently purchased used Panasonic SL-HM42 - recently-purchased-used-panasonic-sl-jxgmd5u3zcskalhaccgps5fw-3-41.pngsed-used-panasonic-sl-jxgmd5u3zcskalhaccgps5fw-3-41.png" alt="recently-purchased-used-panasonic-sl-jxgmd5u3zcskalhaccgps5fw-3-41.png" class="h_mi" />

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 theRecently purchased used Panasonic SL-HM42 - recently-purchased-used-panasonic-sl-jxgmd5u3zcskalhaccgps5fw-3-60.png 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.

NB - Both screws allow for fine pitch control, so if the second is already at maximum speed, you can use the first screw for additional speed.
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.
Happy listening!

vincent hatt

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  • Posted on Oct 03, 2013
vincent hatt
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If for sure there isnt a locking waher or anything keeping the platter down what i do is i put my hands on the platter at the 3 and 9 position. gently start jiggling the platter from side to side it is probably gummed up and needs a thorough cleaning thats probably why it is running slow, keep one of your thumbs on the centre spindle so as not to inadvertantly bend the spindle it also gives u better leaverage to lift it up .

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