Pitch is off--too slow before, now too fast.

This could be the result of pitch adjustments gone awry. Also, you may have both the 45 and 33 1/3 buttons pushed down which cause it run at 78. Here are a few trouble shooting tips and you can find the full manual for the TT at the link posted below:

Record sounds too fast or too slow. 1.) Turntable is set for wrong speed. Make proper speed selection for record type being played with platter speed buttons. 2.) Variable pitch is engaged. Depress quartz button or return pitch adjust slider to center detent position to engage quartz lock. Moving pitch adjust slider produces no effect. If the LED next to the pitch adjust slider center detent position remains green when the slider is moved, quartz lock is engaged. Depress the quartz button to disengage the quartz lock and activate variable pitch. The LED should turn RED

it will be the turntable speed not exact
quality turntables have bars all around the circumference and when the speed is correct under a fluro light those bars will appear as stationary or using a strobe light set at 50 or 60 cycles a sec
bars going anticlockwise are too fast and moving forward are too slow
quality tables have a small knob or screw to adjust motor speed

The motors are a common problem with this
model! Replace it to correct but I suspect the
motor regulator ic which is not avalible is the
real problem!

If I can understand you right, the turntable is running fast. I don't think you need a new motor, generally the deck will run slow if the motor is knackered (or not at all). What you need to do is remove the platter, you will find a horseshoe bracket holding it on at the spindle (it may be covered up so you wil have to remove the cover part often a silver disc). The most likely cause will be the rubber idler tyre being worn damaged etc or out of place. There could be grease dirt or something else causing the problem.

I have a Techniques SL-23--just bought two brand new belts. One runs too slow and the other too fast.

How do I fix it?

Chances are the pitch slider is worn and needs replacement, look here :-
http://cgi.ebay.co.uk/PIONEER-CDJ800-CDJ100-CDJ-200-350-400-900-PITCH-FADER-/300439884467?cmd=ViewItem&pt=UK_Mixers&hash=item45f39cd2b3

Speed is not a factor in moving air. You can move air with a little fan that runs real fast or you can move the same amount of air with a big fan that moves slow.

It is the pitch of the blades that moves air. Big blades with steep pitch moving slow are comparable to little blades with shallow pitch that move fast.

It seems to me someone is trying to baffel you with bull**** when they tell you CFM = watts or something similar.

The real question is, is the fan moving the air necessary to achieve the result you desire? If yes, speed is not really a factor.

Let me know if this helps you.

a

you need to replace the Pitch controls. I'm presuming it is a sliding pitch control. Use the Red start stop lights that reflect on the rotating wheel. put the pitch in center 0. does one row of the dots on the wheel stay completely still.now just turn it up op down a bit until it starts to move the dots slightly. now watch the dots now while there moving. Do they fluctuate they should be smoothe. do this on both decks to find out which one is fluctuating.

I'm having a similar issue - except my panasonic sl-hm42 platter is moving too slow on 33 1/3 settings (don't have any 45's to try). It's a DC model, so I would think there would be some kind of pitch control settings or screws somewhere on it but I can't seem to find them.
Does anyone know if it's possible to adjust the pitch on this model turntable? Thank you!

Yep, time to replace the pitch control. You can attempt to do this yourself, however good soldering skills are required (not the time to learn). You will have to desolder the old pitch control, and solder on the new one. Which is why I say, now is not the time to practice soldering on your turntable. You could actually cause more damage.

If after replacing the pitch control, you still have the same issue, then there is something wrong with the drive on the unit. The drive is controlled by various integrated circuits (IC's), and they are known to short out every now and then. The problem is isolating the correct IC. FYI, Technics is starting to discontinue parts, and 1 of the main IC's on this unit is no longer available (IC302 - Nand Gate).

You can order the PITCH CONTROL HERE.

DJ PRO LAB
www.DJPROLAB.com