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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


FracRack Panel Dimensions & Hardware

August 4th, 2010 by gumi | No Comments

FracRack Panel Dimensions & Hardware

A friend of mine sent me this very handy FracRack information. I’m not sure who wrote this up originally, but whoever it was, thanks! Measurements Frac rack modules are 5.25″ high, with widths in multiples of 1.5″. Per instructions on the Blacet website, mounting holes are 1/8″ wide, 0.75″ inches from the left and right […]


Alesis HR-16 Service & Owner’s Manuals

June 12th, 2010 by gumi | 4 Comments

Alesis HR-16 Service & Owner’s Manuals

Download the Alesis HR-16 Service Manual Download the Alesis HR-16 Owner’s Manual


Boss DR-110 Service & Owner’s Manuals

June 12th, 2010 by gumi | 2 Comments

Boss DR-110 Service & Owner’s Manuals

Download the Boss DR-110 Service Manual Download the Boss DR-110 Owner’s Manual


Roland CR-8000 Voice Mods by Gumi

June 10th, 2010 by gumi | 1 Comment

Roland CR-8000 Voice Mods by Gumi

Here’s a list of all the voice mods I made to my CR-8000, complete with PCB locations, replacement component values, and a few notes to boot. There are a lot more possibilities than I’ve listed here, but these are the ones I ended up wiring. You might want to experiment with different pot and resistor […]


Roland CR-8000: Someone Else’s Mods

June 10th, 2010 by gumi | 1 Comment

Roland CR-8000: Someone Else’s Mods

Someone Else’s Mods: My experience with this company was disappointing. Twice I asked to buy the documentation on their CR-8000 mods and twice they curtly refused, insisting I pay for the entire kit or installation service. Eventually I was able to reverse engineer their mods, but in the end, I wasn’t that impressed. Many of […]


Kawai R-100 Service & Owner’s Manuals

June 10th, 2010 by gumi | 2 Comments

Kawai R-100 Service & Owner’s Manuals

Download the Kawai R-100 Service Manual: It’s certainly not as detailed as some service notes, but it’s enough to get you started. You might want to take a peek at the schematic before doing any mods to U24 (the voice ROM IC). Note that there appear to be some discrepancies between the component numbers shown […]


Roland TR-505 Service & Owner’s Manuals

June 10th, 2010 by gumi | 4 Comments

Roland TR-505 Service & Owner’s Manuals

Download the Roland TR-505 Service Manual Download the Roland TR-505 Owner’s 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 […]


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