Question about Roland MMP-2 2-Channel Amplifier

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MMP2 seems to have no voltage selector. Manual states power as 230, 240, 110v. I am reluctant to plug my US 110v unit into UK 230v mains. Would appreciate any info?

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  • Al-4 Aug 10, 2010

    Seem to have solved problem by call to Roland UK techies. It apparently uses same system as VS series and senses incoming voltage then automatically switches to correct voltage. Assured me perfectly safe. I don't know why they don't make this terrific facility more widely known. Hope this is of help to others.

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Check the manual..It's on the Roland site

In that unit , it's most likely an auto-switching power supply ie; universal 105 - 230 volts AC 50-60 hz

Posted on Aug 17, 2010

Testimonial: "Many thanks. Confirms what I suspected. Just can't figure why they mark them with local voltage. Maybe to test our nerves! "

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I can only think you refer to its mains lead which mostly are black and may have a "strange type of moulded plug" on its end that is not a 13 amp UK type.
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My DVD22 did exactly the same. The solution mentioned by shelompidid not apply to me since my model already had the fix factory fitted.

The other problem mentioned on page 21 of the service manual did the trick for me, although the complaint does not seem to be directly relavant:

"Complaint: Will Not Read Disc; Other Functions May Be Disabled
See h/k service bulletins HK2004-03 and HK2005-02, as the issues covered there involve similar
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I could actually see on the power supply board that these two caps were damaged, although they were not completely popped. An additional cap which was damaged on my board was EC4.

When I measured the voltages the middle D +5V was reading about 4,6V. I did not expect a problem until I read the statement above on page 21 stating it should not be low by more than 0,1V. My A+14 and A-14 voltages also read about +/-17 to +/-18V.

I replaced all three caps: EC4, EC19 and EC20 with 25V caps instead of 16V caps. The voltage for D +5V now read exactly 5,01V! The A+/-14 read +/-16V (some improvement).

My unit is operating fine after replacing these 3 caps! I suspect that the damage to the caps could have been spikes on the AC suppy some stage, maybe due to lightning. Pretty amazing that only the power supply have damage and not the main pcb.

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sorry to say but you may have destroyed the units. USA uses 110volt. Uk is 240volts. There may be circuit protectors, pico fuses, internal fuses, and transformer fuses that have failed. replacing them first is the first approach to getting them going again. An adapter plug is not what you need. You require a step-down transformer to reduce the voltage supplies to 110volts. Check on the units also. There may be a voltage selector switch that you can select the right voltage for the UK. Be careful with how you go. Mains voltage kills. If you are not sure then please go to a tech and have them check the decks over for you. Good luck

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