dm-2 calibration?

[tacobender]

So I picked up an old dm-2 for pretty cheap, I wondered why the price was low but I figured what the hell. Then when I played it I realized something was off, so I popped it open and realized someone monkey'd around with the trimmers. Clock and bias are both out of wack, I tryed to adjust it by ear but its pretty difficult. I don't have an oscilloscope to hook it up to so I was wondering if anyone can tell me how to get it sounding right. I'm not worried about extended delay time, just wana get it sounding good.

[aion]

http://atomiumamps.tumblr.com/post/15659263080/boss-dm-2-adjustments

It's a little bit of an involved process but that's the best description I've read outside of the service manual:

http://www.hobby-hour.com/electronics/s/dm2-delay.php

[digitalzombie]

Here's the inside of mine. I think they used different chips at different times, so I'm not sure if this'll work for you. It can't hurt to use this as a jumping off point, especially if it's the same chip. I accept no responsibility

http://imgur.com/a/xq3qt

P.S. I might have monkeyed around with mine a bit when I first got it a few years back, but currently it sounds good.

[tacobender]

Thanks guys, been messing around with it, getting pretty close but still not quite on point. Guess I'm just gona have to just bite the bullet and get a scope!