HI, Your unit is very old and it can be repaired. Look for someone who does vintage synthesizer repair. John, Syntronics.
SOURCE: Need casiotone mt 36 manual please.
I went there as well casio.com/usa I would try the MA 150 many times the instructions are very close to each model. If this still wont help, try Ebay and Yahoo there a lot of manual collectors there . You may even get lucky on YouTube good luck DFD please rate me
SOURCE: Power input needle snapped on Casio CTK 1000
The answer is repair shop if you don't have tools or experience with soldering. If you do it is simple to take it apart and take the old supply jack out. Take it to an electronic parts supplier so they can match a new one up for you. Make sure that the holes in the circuit board are clean and free of broken pins. Make sure that the traces leading to the holes are intact. Do not use too much heat or they will separate from the board. It might help to take the adapter with you as the jacks and plug have to match in size.
SOURCE: I have a Casiotone MT70 made in 1984. How do I
Here is how you might check the polarity of a 7.5 volt DC replacement adapter:
Put the 5 batteries into the unit and verify operation. NOW using a DC voltmeter measure the voltage from battery negative and meter negative connected and meter positive to the pin on the power jack. IF you see 7.5 volts positive, then the pin is the positive lead for the adapter.
If you see zero, then continue testing.
With the 5 batteries inserted, connect the positive meter lead to the positive of the stack of batteries. Now touch the negative meter lead to the pin.
If there is 7.5 volts there, then the pin is the negative lead for the adapter.
READ THESE INSTRUCTIONS CAREFULLY.
USUALLY the jack has a contact that disconnects the batteery when the plug with sleeve is inserted.. We are testing the jack without inserting a plug here so the plug should HAVE THE BATTERY VOLTAGE with correct polarity on the pin.
Testimonial: "Very clear explanation for a non-techie to understand. Many thanks."
SOURCE: Need an Owners Manual / Users Guide / Operation
You can download a copy at this site... one has to join it for a very nominal fee... about $2 which is worth it...
http://filez-express.com/download.php?file=casio%20mt%20500%20manual
SOURCE: manuals casiotone 501
Try looking at this site:http://www.casio-europe.com/euro/support/repair/emi/ I don't know what country you are in so this is your best bet.
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