Random header image at GumiElectronic

Schematics

Yamaha DX7 IID Owner’s and Service Manuals

November 14th, 2010 by gumi | 4 Comments

Yamaha DX7 IID Owner’s and Service Manuals

Download the Yamaha DX7 IID Owner’s Manual Download the Yamaha DX7 IID Service Manual


Roland CR-8000 Service Manual, Owner’s Manual, & Voice Board Schematics

June 10th, 2010 by gumi | 3 Comments

Roland CR-8000 Service Manual, Owner’s Manual, & Voice Board Schematics

Download the CR-8000 Service Manual: This might be the most useful service manual I’ve come across, and the precise labeling of key locations on the voice generator board made the work a breeze. Roland really used to have their shit together. Download the CR-8000 Owner’s Manual Download the CR-8000 Voice Board Schematic: Here’s a “corrected” […]


Roland CR-8000 Bass Drum Decay Mod

June 8th, 2010 by gumi | 1 Comment

Roland CR-8000 Bass Drum Decay Mod

Below is my modification of the original CR-8000 bass drum circuit (in blue). Those familiar with the TR-606 mods will notice the similarity to Geoff Waterson’s TR-606 BD Decay Mod. You can experiment with the component values (especially the .047uF cap and 33k resistor) to get different results. I selected a 33k resistor because it […]


Photos

_____________________________________________