Easy. Flip over, take out the screws, remove the rear panel and take off the PCB (if it doesn't have a battery holder). You can't go wrong.

There are many reviews online. And on the Paia website, you've got some mods to add features to it.

You've got a simple DIY MIDI>DIN /DIN>MIDI here: http://www.colinfraser.com/m2d/m2d.htm

http://www.electronics4fun.50megs.com/dos_programs.htm (found that old link) Health is yerk the past few days. Still got problems with concentration. I try to slowly restart working (need money) and I've got real problems to. Thanks for asking. Sorry if I sound rough... I hate to feel half there all...

Why didn't you say so in the first post that you need one working for the soundcard? Can't know. There are models that work with serial port and other with USB. Be specific.

From old bookmarks: http://www.oscilloscope-lib.com (freeware but don't remember if for soundcard)

I continue checking

Visual Analyzer, maybe? http://www.sillanumsoft.org/prod01.htm (this is a freeware but I dunno what it requires)

And there must be more by searching for "Free PC/WIN Oscilloscope"

But you must mean this: http://www.geocities.com/lptscope/

Not that I don't want to help you out but it I do the complete troubleshooting, this is work. And as a small business, I cannot troubleshoot everybody's instrument for free. Especially working without any schematics nor any references. That's why in here I give general pointers for the person to che...

The guy only ships to USA... maybe you can change his mind. I'm willing to share the bill for clean, readable copies. It doesn't mention my model. But thanks for finding it anyway! Odd... last night, in the description of the auction, there was a HP-860 service manual in the lot... Am I going insan...

http://cgi.ebay.com/ROLAND-HP-KEYBOARD-SCHEMATIC-_W0QQitemZ370081506625QQcmdZViewItemQQimsxZ20080829?IMSfp=TL0808291769r33887 The guy only ships to USA... maybe you can change his mind. I'm willing to share the bill for clean, readable copies. Or maybe there is a USA member here who wants to help me...

That I know. But you go by elimination. Where the buzz can come from, the more naturally? Power supply, from a power transistor. And from the output module. You can use some Deep Freeze to cool 'em down. When they'll heat, you can hear the buzz. Go from section to section, methodically. Inject a sig...

I just found the HP-600/700/800 service manual in my stuff. Let me know if you want a copy (for cheap, excellent, complete pdf). Maybe that could help you out.

Hi Maschinengeist, Do you actually have a service manual for the MMT8? Meaning, not just the full schematics but an actual service book with info? If you do, I'd be interested in buying a pdf version of it from you, if you would be interested. I've heard of an elusive service manual for it but ave ...

I just found the service manual in my stuff... I check it out (quite probably this weekend).

I'd check around for a transistor or op-amp.

Hi Joshua

I've placed a request to one of my suppliers for the service manual. Usually, I should hear from him in 2 days max.