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How to repair a broken input jack on a roland cube amp

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Posted on Jan 02, 2017

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SOURCE: Roland AC-60 Amp input impedances ?

I will solve the mystery...

The impedance varies depending on how you connect. It would be too complicated to explain the impedance to the average person.

From the schematic we have the TRS 1/4 inch jack having basically 100K and parallel 220 pf cap to ground EACH signal line and 10K resistance between. (The TRS jack if used disconnects the XLR and its components)

If one uses the XLR jack, one has an ADDITIONAL 100K each side in parrallel to ground PLUS an ADDITIONAL 2.2K resistor shunting between.

In ADDITION to the above, there is effectively 160K ohms to ground each side that is the input resistance to the input OP-AMP.

The effective impedance will depend on how and where you measure it.

Not sure what peizo you are using... For one on wife's violin we go into a X2 wireless which has about 1.6 Megohm. The receiver of course is fairly low impedance drive to the amp.

For the violin (Autolycus) pickup and others, severe distortion of the waveform existed when run directely into most amps and of course long cables worsened it at the high frequencies.

Posted on May 20, 2010

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SOURCE: roland cube street water damage repair

What part of it got wet will determine the course of action.

If the whole unit were submerged, the unit may prove more time consuming to try to fix than to locate a used one. However, I have salvaged imersed laptops before. the procedure is not much different- make sure the unit is as dry as you can possibly make by blowing a fan on it for an extended period of time.- Days.

Once dried, use some contact cleaner on the jack contacts and interupts, any manual control and any switch.

You can then apply power. If nothing lights up, check and replace fuses as needed. Also check the power supply board for failed caps or rectifiers.

Once the power supply is known to be functional, systematically check the LCD display and the aspects of the amp that it controls. This board will be the most vulnerable and most likely to be the source of most issues you will encountr.

If the display survived intact, and amp does nto work, apply a signal to the inputs and trace the signal through the amp with a set of headphones set up with test prods. The problem will be where the signal stops.

Posted on Apr 27, 2012

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1 Answer

My roland cube street starts making this really weird loud noise


Hi, Quick Check. Very often the input socket which is soldered directly to the circuit board, will have a broken solder joint. This is common on a very large amount of equipment. Try waggling the plug about and seeing if the noise comes and goes.
Easy fix, re-solder joint. Permanent fix, connect socket to board with flying leads, or fix socket to board with hot glue or epoxy resin.
All the best, Chris the Fader.

Mar 23, 2013 | Roland CUBE Street Amp Combo

1 Answer

Fix a Boss GT-10 broken input jack


what is your question?
if not working, you have to open the device and find out where it is not connecting (broken solder joint? bent or worn out contacts? wire off?) and repair. or if beyond repair, order a new part.

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1 Answer

Roland cube street water damage repair


What part of it got wet will determine the course of action.

If the whole unit were submerged, the unit may prove more time consuming to try to fix than to locate a used one. However, I have salvaged imersed laptops before. the procedure is not much different- make sure the unit is as dry as you can possibly make by blowing a fan on it for an extended period of time.- Days.

Once dried, use some contact cleaner on the jack contacts and interupts, any manual control and any switch.

You can then apply power. If nothing lights up, check and replace fuses as needed. Also check the power supply board for failed caps or rectifiers.

Once the power supply is known to be functional, systematically check the LCD display and the aspects of the amp that it controls. This board will be the most vulnerable and most likely to be the source of most issues you will encountr.

If the display survived intact, and amp does nto work, apply a signal to the inputs and trace the signal through the amp with a set of headphones set up with test prods. The problem will be where the signal stops.

Apr 26, 2012 | Roland CUBE Street Amp Combo

1 Answer

Roland Micro Cube Amp fuse blew out. How do you fix it?


have a look here:
http://www.ehow.com/how_8698510_fix-roland-cube.html

although it doesn't mention the fuse you will probably find it. Sometimes there is a fuse access on the outer case.

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2 Answers

Input jack fell inside


Yes, the jack MAY actually be broken. It will need to be serviced. Run cables through the handle to avoid plugs from being yanked sideways and breaking the jacks.

Aug 23, 2011 | Roland Cube-20x (20w 8" Modeling Guitar...

1 Answer

I need to replace the power push button, but do not know what part number it is. Trying to get it ordered through Mouser, but there are too many listed. All I know is that it's an Alps switch, and it reads...


HI,

I've just had a Roland Micro Cube amplifier in for repair and it uses the same type of Alps switch you mention. ( It's also broken )

This is a simple single-pole latching push-button switch, so electrically, almost anything rated for an amp will be good enough.

Alps no longer make the same part, so you'll need to find something which looks the same and fits the original hole.

My repair is easier, because the replacement part doesn't have to match anything.

Graham.

Jan 27, 2011 | Roland CM30 CUBE Monitor Speaker PA...

1 Answer

Roland AC-60 Amp input impedances ?


I will solve the mystery...

The impedance varies depending on how you connect. It would be too complicated to explain the impedance to the average person.

From the schematic we have the TRS 1/4 inch jack having basically 100K and parallel 220 pf cap to ground EACH signal line and 10K resistance between. (The TRS jack if used disconnects the XLR and its components)

If one uses the XLR jack, one has an ADDITIONAL 100K each side in parrallel to ground PLUS an ADDITIONAL 2.2K resistor shunting between.

In ADDITION to the above, there is effectively 160K ohms to ground each side that is the input resistance to the input OP-AMP.

The effective impedance will depend on how and where you measure it.

Not sure what peizo you are using... For one on wife's violin we go into a X2 wireless which has about 1.6 Megohm. The receiver of course is fairly low impedance drive to the amp.

For the violin (Autolycus) pickup and others, severe distortion of the waveform existed when run directely into most amps and of course long cables worsened it at the high frequencies.

May 20, 2010 | Roland Ac60 Acoustic Chorus Guitar...

2 Answers

Amplifier not working


The Cube 60 is a guitar amp, Often these problems are due to a damaged inout jack on the unit. People trip over the guitar cable and the cord gets yanked sideways and breaks the internal parts of the jack. Sometimes circuit boards are cracked.

ALWAYS run your cord through the handle or restrain it should the cord be yanked.

The problem with your unit is internal and it will need to be opened and trouble shooting done.

Dec 15, 2009 | Music

1 Answer

Guitar amp signal interference.


Mine did that. Found out it was the input jacks

Apr 29, 2017 | Roland Music

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