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Originally posted by dj chex You'll need a decent multimeter for this: for 0% pitch (oh yeah, be sure the fader is EXACTLY AT 0%), the frequency of pot VR301 should be 262.08KHz +/- 0.05KHz. Connect the + lead to TP27 and - lead to ground. For pitch control gain adjust, connect the + lead to pin 5 and the - lead to pin 6. Then the resistance should be 2.875Kohms +/- .25Kohms, if off use pot VR302 to adj. (btw, this is part of the same connector that the guide told you to cut that wire) You probably shouldn't of cut those leads that was on that web site. Now you deck probably won't use the quartz crystal and rely heavily on the resistance of the pitch control. Therefore if the fader is going out, you may experience a more noticable pitch drift and more pronounced wow/flutter than before.

I figured I could always just solder it back if I really needed to, I just couldn't stand it for a second longer. Over the last couple of days especially, I have encountered more and more problems with it.

I've never used a multimeter before, should I go out and buy one? I see one's on radioshack that are only about 20 bux, is there anything in particular I should be looking for?

trying to find one w/ a built in frequency counter is the hard part. If anybody knows a decent, cheap one w/ freq counter please tell. Frequency counters are usually expensive i believe. When i calabrated my 1200s i used my radioshack meter w/ the resistance on pot vr201, but as for the pitch at 0% i just ignored it b/c my dad couldn't find his oscillascope.

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Make it idiot proof and someone will make a better idiot. He who laughs last thinks slowest!

I think i have a winner.....

http://www.radioshack.com/product.a...t%5Fid=22%2D811

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• Unit measures frequency up to 4MHz and detects electric fields

sounds like just what i need.

___________________

quote:

Make it idiot proof and someone will make a better idiot. He who laughs last thinks slowest!

http://www.radioshack.com/product.a...uct%5Fid=22-810

Thats no good?

Was going to write the steps, but dj chex already did...saves me time . Follow the steps which dj chex posted.

It's true that often only the expensive multimeters can handle frequency. While back when I was in the process of calibrating I asked everybody I knew and their grandmothers if I could lend one, most people gave me this akward look and said: "What's a multimeter". Or they would have a multimeter that would handle everything from Ohm, Volts to even IQ (j/k ), but couldn't handle Frequency.
Finally I found someone after weeks of asking around. I could also have bought one, but they sell them at 50 euro here being the cheapest and I would only use it once.
So ask yourself if you're gonna be using it a lot for other things too, else it's best to ask friends/family etc.
The multimeter you found at radioshack isn't good, it can't measure frequency. Look for ones that can measure in Hz (Hertz). The one dj chex posted from radioshack will do.

The steps are very straightforward actually, quite easy.
BTW, you might have turned the blue pot too far. It only needs minuscule in-/decrements. Just use a multimeter to get the exact values .
The steps from the link that Briden posted aren't correct. I haven't read it all, but already found an error...

I'll just go ahead and post the steps here once again:
0% PITCH CONTROL ADJUST:
Set the pitchfader on 0% and measure on testpoint TP27 with a multimeter. Place the (+) on TP27 and the (-) on GND. Adjust potmeter VR301 until it reads a frequency of 262,08 +/- 0.05kHz. Some multimeters will only show one decimal, so if you get it somewhere between 262,0 or 262,2 you'll be fine.

PITCH GAIN CONTROL ADJUST:
Set the pitchfader on 0% and measure on pin 5(+) and 6(-) of the detached pitchfader connector.
Adjust potmeter VR302 until the multimeter reads 2,7 +/- 0,25Kohm.

If you don't know which connections are meant just download this service manual which will clear things up: http://www.backspin.org/sl1200mk2.pdf
Hope you find this useful and let us know how things went .

Before I forget, don't press stop/play when you have the platter off!
Unless you want some smoke in your room .

- farris

Last edited by farris on Nov-12-2004 at 14:17