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Author Topic: Seeking Roland Micro Cube Schematic  (Read 747 times)

Clyde

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Seeking Roland Micro Cube Schematic
« on: April 14, 2018, 12:30:26 PM »
Anyone have anything on a Roland Micro Cube COSM ( discontinued early model w/o the i-Cube link feature)?  Roland doesn't want to share with non-authorized folks & I can find nothing on the web.

I have one of these that has as bad amp selector rotary switch (internal contacts broken).  Trying to locate a replacement but the only markings on the existing switch is the maker 'Alpha' with '4J1' stenciled on the back.  Anyone have a part # for a potential replacement?  Amp has 7 'amp sim' positions, so I am guessing that a 7 pos replacement like this one might work:
http://www.alps.com/prod/info/E/HTML/Switch/Rotary/SRBV/SRBV170501.html
or this:  https://www.mouser.com/ProductDetail/105-SR1712F-16NS

Thoughts?

Jazz P Bass

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Re: Seeking Roland Micro Cube Schematic
« Reply #1 on: April 14, 2018, 01:24:23 PM »
Roland will not sell you the switch?

Clyde

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Re: Seeking Roland Micro Cube Schematic
« Reply #2 on: April 14, 2018, 02:42:52 PM »
Roland might.  I just have to wait for Monday when their parts dept opens up.  In the meantime I thought I'd ask around with the intent of going thru Mouser rather than Roland to get a replacement.

Clyde

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Re: Seeking Roland Micro Cube Schematic
« Reply #3 on: April 22, 2018, 10:24:19 PM »
Roland seems to wants to deal with 'authorized service' shops and not so much with DIY repair.  At least with schematics and internal components/parts.  So... I ended up with this Alps 7 pos switch from Mouser.  Works perfectly.

 https://www.mouser.com/ProductDetail/688-SRBV170501

There were also 2 ea 1K ohm 0603 SMD resistors that were open.  These were 2 of 8 located on the amp selector baby board that the switch was mounted on. Replaced same and all is well. 

Initial problem was only two of the amp select choices was working.  The above replacements corrected the issue.  But in poking around the rest of the amp I could not help notice the Alps pots are not held together by much.  Closer inspection led me to believe that this amp had been dropped on its top or stacked with something on top that placed pressure on the control knobs and pushed the back out of some of the pots (selector switch included).  I'll be replacing these Alps with something more robust. 

« Last Edit: April 23, 2018, 11:26:48 PM by Clyde »

 

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