The Repair Bench: Roland Micro Cube

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guitarkitbuilder
07:46 Friday.25 September 2020

Reply to Tom 07:41 Friday.25 September 2020 – Tom, it’s hard to say from what you’ve described so far. Have you tried the 1/4 input with a guitar and is result the same? On the aux input, the sound starts low then goes away completely? Does the volume control have any effect? If you angle the plug in the jack slightly back and forth is there any change or noise?

Tom
07:41 Friday.25 September 2020

Love my micro cube, but recently found that the auxiliary input is very quiet and then quits altogether. I’m feeding in a track from my laptop to the auxiliary input. Tried both the 1/8 and 1/4 inputs, but no difference. Any ideas or suggestions?

Tjjmaxd
01:24 Monday.03 October 2011
Thanks for the help!

Ok so the adapter was a nine volt, I’m pretty sure it was .
As for the size of the connector I’m not sure but I think they’re about the same size, one might be slightly larger than the other but the difference is hardly noticeable, in any case, is there anything that I can do to save my little buddy?
And thanks once again

anonymous
01:51 Thursday.21 June 2018

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Tjjmaxd
22:27 Saturday.01 October 2011
Hey guys!

My Roland micro cube has gotta be my favourite amp that I can practice on and I fell in love with it the minute I plugged it in and jacked it up, but ivd got a serious problem. The other day I accidentally used a different power adapter on it than the one it says for you to use. Now it worked perfectly, sounded exactly the same no problem at all, but now when I try and plug it in with the original adapter it won’t seem to work anymore. I can’t get a blip out of it, nothing works on it :( it may also have been that I forgot to turn it off, as the power switch was on when I went back to it. I’m really not sure, but I really wanna get it back in working order somehow, I love that little amp!
Please help
Thanks

anonymous
03:42 Wednesday.22 October 2014

[…] Roland Cube Tech question. This is what it looks like inside. The Repair Bench: Roland Micro Cube – GuitarKitBuilder […]

Mrjones2004x
05:12 Sunday.01 January 2012
Hi there, hopefully you can help me out.

Had a micro cube for about 6 months with no grief and loved it. Decided to wire in an external speaker jack to see how it sounds. I first off wired in a switched mono jack and mounted it the rear panel. This didn’t work as I soon realised I was shorting out the amp with the negative speaker wire on the chassis.
And how I took it out and fitted a plastic mono speaker jack and it worked fine for about 30 mins through the internal speaker then the next time I tried to use it was dead. Had an 8 ohm cab plugged in for 5 mins at one stage but as I say was working fine before turning off.
Checked all my solder connections and also put back to standard even to test. Power comes in and go’s to the main board but I don’t know how to check after that. Only used proper psu and with batteries.
You think I fried something by shorting it out? I prob did it about 10 times during the first install whilst scratching my head. I love this amp so hopefully you can help me
Regards

Mrjones2004x
05:11 Sunday.01 January 2012
Hi there, hopefully you can help me out.

Had a micro cube for about 6 months with no grief and loved it. Decided to wire in an external speaker jack to see how it sounds. I first off wired in a switched mono jack and mounted it the rear panel. This didn’t work as I soon realised I was shorting out the amp with the negative speaker wire on the chassis.
And how I took it out and fitted a plastic mono speaker jack and it worked fine for about 30 mins through the internal speaker then the next time I tried to use it was dead. Had an 8 ohm cab plugged in for 5 mins at one stage but as I say was working fine before turning off.
Checked all my solder connections and also put back to standard even to test. Power comes in and go’s to the main board but I don’t know how to check after that. Only used proper psu and with batteries.
You think I fried something by shorting it out? I prob did it about 10 times during the first install whilst scratching my head. I love this amp so hopefully you can help me
Regards

guitarkitbuilder
23:06 Saturday.01 October 2011
TJ,

The first question is what was the voltage and polarity of the power supply (PS) you accidentally used? It should be marked on the body of the power supply, and there should be a small illustration of the polarity, showing either or – as the center. Let me know what you find on this.

Now as to why the original PS isn’t working anymore, I’m just guessing here, but I’m wondering if the second PS connector was of a larger size, and perhaps stretched out the inside of the power jack on the amp, so that the original PS doesn’t make contact anymore? Are the power connectors from the two supplies identical in size?

guitarkitbuilder
06:50 Tuesday.13 December 2011
I’m happy to try to help diagnose the problem but I need some clarification. How do you know you’re having a problem with the COSM switch? I have the owner’s manual in front of me and there is a Tuner switch, a “Select” switch, and the rotary knob for the different COSM sounds. The select switch changes between the clean lead channel and the COSM effects I believe. I think you’re saying that the tuner switch is working. What happens with the select switch – does it change between the clean lead and the COSM effects (which I understand you to say are stuck on Black Panel)? With the tuner on, try the manual tuning mode – does the rotary knob work in terms of changing the string being tuned?

Couple of other things – make sure there is no footswitch plugged in, since this interacts with the rotary knob setting. Also, do a factory reset to make sure that the solo feature is not getting in the way. To do the factory reset, Hold down the [TAP/STOP] switch and the SOLO [ON/OFF] switch at the same time and switch on the power. The SOLO indicator blinks and the settings saved with the SOLO function are returned to their factory defaults.

OK let me know what you find

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