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lingyueqing

How to venture in to the world of modifications on some drum machines

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First, let me say I've done some reading and research, but I didn't study in this field, so my terminology and knowledge may/will be limited and/or flawed, so please correct me at any point if you see a mistake

I've decided to venture in to the world of modifications on some drum machines I own and have several beginner questions. See the links for the schematics for a Boss DR-110:

http://manuals.fdiskc.com/tree/Boss/Boss%20DR-110%20Service%20Manual.pdf

as well as a decent picture of the board :

https://www.flickr.com/photos/8841838@N07/3335229549

Here you  can find How to Read Resistor Color Code: http://www.apogeeweb.net/

I've found a list of potential mods for this board and the one I've selected first says "replace R12 with a 1k pot" ... this is in an isolated area of the board and seems to be as basic as it gets for mods.

The person has documented this as a 1k pot, which I'm not sure is correct since I haven't opened up my unit yet to view the color coding on the resistor and can't see in enough detail from the link, but let's assume its correct. My mod should involve the following:

  1. remove power
  2. Unsolder resistor, remove resisitor
  3. calculate resistor value, test resistor (not required, but I need practice)
  4. wire pot (ground first and attach, input, output)
  5. attach input/output
  6. test

My questions are:

1) How do I determine the resistance and power value of the removed resistor with and without a multimeter? The power supply for the unit is 9 volts.

2) How do I calculate what size wire I should use for the pot and input/outputs?

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Some basic things to do:

More research on the mod if possible.  When it refers to a "pot" that would lead to believe they mean a potentiometer.  

To find the value of the removed resistor just use the color code chart you already posted or here is another good source if you don't know how to read resistors http://www.resistorguide.com/resistor-color-code/

Wire size would need to be determined based on the power draw through the circuit it will be hooked up to.  Most small electronic mods can use standard hookup wire, but you would again need to research the power requirements for the circuit. 

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