Stax Quattro I and II repair

[Earspeakers]

I have a Quattro I and II with different issues, appreciate anybody who has repaired CDP's. I haven't opened these up yet, doing some research first. 

• Quattro I. Has tracking issue. Has trouble tracking some disks randomly (some 20% of the time)
• Quattro II. Sticking/opening drawer issue. Possible to replace the drawer mechanism? Any replacement drawer pointers?

Thanks much -

[mwl168]

No experience with Stax Quattro. 

 

Last time I had some major sticking/opening drawer issue with Wadia transport it turned out to be aging rubber belts in the drawer mechanism needed to be replaced. Given the age of these players that's where I would look first (if belt(s) is used). 

 

For ransom tracking issues I usually make sure there was no dust or other contamination on the laser lens first. I did have to replace a laser assembly once due to aging as well. 

[Earspeakers]

Good ideas, I'll check the belt. 

 

I read somewheres that there might be POTS on the board to twiddle for adjusting the tracking, I'll be on the lookout. 

[DefQon]

I wouldn't touch the pots for optical laser power and tracking as a last resort if you can't fix it via anything else.

 

A draw sticking problem could be a problem with the limiter/latch switch underneath the draw or an over-greased or under-greased gear/belt that is causing slippage when the draw motor kicks in to open the draw. This problem can also cause tracking issues (random skipping on a track of a cd) if the draw is not closed or opened properly, a miss-alignment in the laser head to read from the tracking of the disc.

[Earspeakers]

I wouldn't touch the pots for optical laser power and tracking as a last resort if you can't fix it via anything else.

Good tip, just so I know what I'm getting into if I have to resort to that, why should doing it be avoided?

 

 

A draw sticking problem could be a problem with the limiter/latch switch underneath the draw or an over-greased or under-greased gear/belt that is causing slippage when the draw motor kicks in to open the draw. This problem can also cause tracking issues (random skipping on a track of a cd) if the draw is not closed or opened properly, a miss-alignment in the laser head to read from the tracking of the disc.

 

Thanks.

[DefQon]

Because it will permanently damage the laser. Rather a partial working laser with a fault lying elsewhere than a completely dead non replaceable laser.

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[DefQon]

And to do it properly you need an o scope

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[Earspeakers]

Got it. I have scopes at work I can use (haven't bothered to buy one as I can borrow one that costs as much as my house), but I'll leave that alone.