Dear All, I have bough a Yamaha msp7 studio monitors in U.S and I am using them in Europe. I got all the necessary power adapter but it wont work. No light in the bootom right switch.

SOURCE: Yamaha YPT310 use of wrong adapter fried fuse won't power up

1200 ma provides more power than the 700 ma, and would not be affected by using it on a device that draws 700 ma. The voltage of the charger makes a difference as well as the polarity of the plug. (if it is dc)

If the 700 ma charger is not working, most likely the 700 ma charger is not working

SOURCE: Is it possible to connect

It is possible and depends on the length of cables you will need. If you are using a fairly long run of say 50 feet, I would put a DI box with "ground lifted" to convert from unbalanced to balanced. If the cables are short, then you can probably use a unbalanced 1/4 inch plug to XLR adapter and an XLR to XLR cable between the adapter and the speakers. The system should be safe and should NOT cause any damage. Remember to run the whole interconnected system from ONE receptacle or power source.

SOURCE: Yamaha psr e313 can't switch on. The adapter is

Check that your power adapter is 12 volts DC AND MOST IMPORTANT is the center pin is positive... this is reversed of MANY adapters used for pedals, etc. The current rating should be around 1.5 amps. Don't take another techs word for it... check it yourself.

SOURCE: Hi, I purchased a pair

Power supply built in speaker box seems damaged and possibly a fuse or transformer got blown, local technician will check it by opening lower rear panel of speaker box and will replace blown part.
Hope these info will help.