"Test Disk"

Does anybody have the "Test Disk" that the service manual refrences for the 60?

Good question.

maybe we ought to ask Roger Linn if he can release it for MPC 60 Longevity.

I tried Akai US and Japan and they said they don't have it. I called VSt and they would not give me a copy. I think you can get by with out it. The calibration check is no big deal anyway.

Damn you went through the calibration procedure?

Damn.

mikedean wrote:I tried Akai US and Japan and they said they don't have it. I called VSt and they would not give me a copy. I think you can get by with out it. The calibration check is no big deal anyway.

Thanks for trying. Ive been looking too, but since there are so few companies that service these machines its gonna be difficult to get a copy. Hopefully someone still turns up with one though...

Can you explain the calibration check a little more in depth for us noobs? Did you do it thru the os?

I think all I did was create a tone in Cool Edit or Soundforge and used MPC editor to create a snd file to use during the procedure. My unit did not required adjustment. I have since sold my 60 and got a 3000.

The full calibration procedure requires the use of an oscilloscope. It is pretty advanced and beyond most users, hence that why the disk is a 'service center only' part.

Yeah, I have a scope and know how to use it, but I still don;t want to try and calibrate the DACs in the 60!!! Even with the service manual, you don;t want to monkey around with that stuff.

We are lucky that there are still service centers who know the 60 and have the disk. in a decade or so it may not be so easy, and having the disk to provide a tech with along with the service manual would be a handy bit of future proofing.

Yeah. I think the procedure is adjusting an offset voltage. I would not mess with either unless you have a problem with that circuit specifically. I did the check because I could not resist. If you do open up your 60 and wanna monkey around with it, make sure you mark any Potentiometers before you move them. That way if you make an adjustment error you can go back somewhere close to where it was origionally.

In my experience marking potentiometers, especially trimmers, doesnt work. you can have very different values that look like they are on the same marking. The only way to really mark were you are is to get a reading of the voltage off the pin, or read the resistance from the center pin to the outside pins, but even that is iffy because resistance readings need to be done out of circuit.

Once you mess it up you gotta recalibrate. Ive done that many times on analog synth trimmers, and once it's off, you gotta work hard to get it back right if you don;t have the right test equipment, well, sometimes even with that.

I don;t think anyone here should mess with those trims, if you're shyt is that messed up, you should get a tech.

But hey, what does the offset voltage mes up soundlike? WOuld it be something someone would want as an effect or does it just screw up shyt in a no good way?

[quote="elmacaco"]In my experience marking potentiometers, especially trimmers, doesnt work. you can have very different values that look like they are on the same marking. ?[/quote]

This is def. true. Marking 'em never worked for me either.

T