Question about Roland Cube-20x (20w 8" Modeling Guitar Amp)

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My Roland Cube 20x Amp doesn't switch on after a sudden voltage increase! I turned the power supply off in a jiffy though!

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  • Roland Master
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Thee internal fuse should have protected it.

Here is schematic:

http://elektrotanya.com/roland_cube-20_combo_sch.gif/download.html

Scroll down on page and click on "Get Manual"

Posted on Mar 20, 2011

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  • Contributor
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If you take your speaker out you can see if it has blown the internal fuse if not it could be the exernal fuse the power adaptor

Posted on Aug 12, 2011

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Hello my roland street cube won't power on, either with dc or batteries....adapter working .could a fuse be blown inside circuitboard? thanks


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Feb 13, 2011 | Roland Cube-st Battery Powered Amp Cube...

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The unit input voltage is 110 volt and was plugged into 220v outlet. . the input winding is now busted. . i was hoping to know the secondary voltage of the transformer. . i was planning to replace the...


The winding is center tapped. It generates +/-24.5 volts DC. Based on it being a capacitor input filter, we need a peak voltage about 1 volt higher to account for the droop of the capacitor and the .7 volt drop of one silicon diode...

Since we need 25.5 volts peak then we need that divided by 1.414 RMS out of ONE side of the center=tapped secondary... So our secondary voltage is 18 volts either side of center.

You will need a 36 volt center-tapped secondary. Here is one that would work:

http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=162J36-ND

This has two 18 volt windings that you would connect in series and a dual primary you can set for either 120 or 240 input. About $19 US.

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short answer- "yes, but..."

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HI My Rowland Kc60 suddenly has no power. I presume it is shorted out...can I replace the fuse myself, and if so - where and what fuse do I buy and how do I access it on the amp?


Here is a link to the manual:http://lib.roland.co.jp/support/en/manuals/res/1811247/KC-60_e2.pdf Page 9 states that there is a protection circuit built into the power supply. Follow the directions for turning the power on in the manual. If the amp doesn't power up you will have to have it serviced by a qualified Roland tech as there is likely to be some damaged circuitry that won't be repairable without the schematic, parts and safe repair procedures.

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