Comments for Grant Muller

Comment on Casio PG-380 Midi Guitar by Grant Muller

Grant Muller — Thu, 11 Mar 2010 03:35:13 +0000

Thanks Tim. I might have to join this Facebook group now that I have a new love for Midi Guitars Good luck “recapping”, its not all that difficult, and you’ll easily get another 20 years out of the guitar (assuming MIDI isn’t overtaken by OSC…but I’ll have written a translator by then). Good luck!

Comment on Inside The Korg DW-8000: Don’t Put Solder on a Battery by Grant Muller

Grant Muller — Thu, 11 Mar 2010 03:22:09 +0000

Good catch Ethan, I feel like a dolt for not thinking that through. I assumed that it must be the EPROM battery because the EPROM was located right next to it…which doesn’t make any sense considering an EPROM requires no power to maintain state. EEPROMs weren’t readily available by the end of the 80’s either, EPROMS were. Too many damned E’s. These are in fact CMOS batteries, and I’ve updated the post to reflect that. Thanks for pointing that out.

Comment on Casio PG-380 Midi Guitar by Timothy Kelly

Timothy Kelly — Thu, 11 Mar 2010 03:14:42 +0000

Hi Grant
I linked to your PG380 photo and article on my new Facebook group. Midi Guitars, Digital Guitars, Technology Guitars, Hybrid Guitars. There are always people on the Yahoo Midi Guitar Group looking for where to get there PG380 caps fixed and or how to fix theirs.

The caps are down on my PG380. So one of these weekends I will have to recap mine. My original caps lasted over 20 years. Thanks for the article.

Comment on Inside The Korg DW-8000: Don’t Put Solder on a Battery by EthanG

EthanG — Wed, 10 Mar 2010 21:20:56 +0000

Oh aye, I’ve seen one or two of these batteries in things & wondered about them. I’m also almost certain I saw CR2xxx sold with pins pre-soldered in RS Components catalog, but that was around 1990…

Also.. a nitpick which might be wrong: if it needs a battery (esp. lithium) wouldn’t it be CMOS RAM & not EEPROM? I vaguely remember EEPROM not being readily available at the end of the ’80s too; not certain about that.

Comment on Casio PG-380 Midi Guitar by Grant Muller

Grant Muller — Wed, 17 Feb 2010 20:58:45 +0000

Yep, shipping on parts always makes me cringe, the parts are $0.17 a piece tops, man I wish I had an electronics retailer nearby!

Good to hear that it worked out for you!

Comment on Casio PG-380 Midi Guitar by bob

bob — Wed, 17 Feb 2010 16:23:37 +0000

@Grant Muller
The pg 380 is fixed. Great work. Thanks, Grant.
Total cost $7, $5 of which was shipping for the caps. Place in NJ said they would fix it for $275, so I saved a bundle.

Comment on Ring Modulator: Initial Prototype by ismael

ismael — Tue, 16 Feb 2010 13:50:33 +0000

wonderful

Comment on Casio PG-380 Midi Guitar by Grant Muller

Grant Muller — Sat, 13 Feb 2010 19:12:08 +0000

It happens to the best of us Bob At least you spotted the inconsistency before jumping in and unsoldering the wrong caps. I probably wouldn’t have spotted this until after I put it all back together…and it didn’t work.

Good luck with the repair, let us know how it goes.

Comment on Casio PG-380 Midi Guitar by bob

bob — Sat, 13 Feb 2010 18:25:05 +0000

Boy i feel stupid..I pulled the wrong board. You’re right, 47 uf.

I’m going to try the repair tody.I’ll let you know how it goes.

Comment on Casio PG-380 Midi Guitar by Grant Muller

Grant Muller — Fri, 12 Feb 2010 17:54:19 +0000

This link should show you how the original board looked, and show you the values of the original caps. Those should be 47uF, not 470uF. And they ought to be quite small compared to replacement caps…