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Reversible Technics SL-1200MK2 Quartz Lock Hacking
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Reversible Technics SL-1200MK2 Quartz Lock Hacking

rltx1 7:06 PM - 28 August, 2008
Has anyone done this? What were your results?


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Introduction

SL-1200MK2 has two different mechanisms for setting platter rotation speed: the "regular" oscilator (or what have they), adjustable by the pitch slider (and two variable resistors on the circuit board), and the venerable ultra-precise Quartz Lock engaged when the pitch control is at 0% and the green light is on. We're going to disable the quartz lock.

The purpose of this surgery is to solve the problem of two zero points on the pitch slider (more here). This problem exists in almost all 1200s I've ever seen, and even my virgin 1210s had their true zero points around the 1% mark when they came from the shop.

Disabling the quartz lock is quite simple. You will need no soldering or other special skills, just a steady hand to take the platter off and disconnect the wires. The process is reversible, so if you ever regret doing this and want your quartz lock back (or just want to sell your tables to an audiophile), you just need to connect what has been disconnected, and your turntables will be just like new, except the repressed memory of abuse they suffered, which never disappears completely.

I've done this to one of my turntables so far. I hope to take pictures and amend this page when I hack the other.

www.vygo.net
Konix 7:20 PM - 28 August, 2008
Cutting the orange wire doesn't actually disable quartz lock, that just disables the center click 0 point. To disable quartz lock on the entire pitch range you need to cut resistor TP17 on the the lower right of the PCB.

I've done both a like the results.
rltx1 7:20 PM - 28 August, 2008
Here is another link. ..

It seems that the MK3 does not have this issue.
Is that right?

www.deepattitude.com
Konix 7:20 PM - 28 August, 2008
*and
rltx1 7:22 PM - 28 August, 2008
Quote:
Cutting the orange wire doesn't actually disable quartz lock, that just disables the center click 0 point. To disable quartz lock on the entire pitch range you need to cut resistor TP17 on the the lower right of the PCB.

I've done both a like the results.


this one mentions the TP17

technics.junglist.pl