ADA Depot - A Forum To Support Users of ADA Amplification Gear
FREE CLASSIFIED ADS => Buy & Sell ADA Gear => Topic started by: wtolp on May 21, 2015, 12:25:00 PM
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I am in need for an ADA MP-1 if anyone in the U.S. has one for sale. My old one is now defunct and need a replacement. Replaced the Battery with the battery mod (everything done to specs) and now it won't even power up. Thanks!
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Hey wtolp, all is not lost !! I agree it's a good idea to bye a replacement/spare (or 2).
So tell us a bit more detail, so you did battery mod ok, that's just about storing and maintaining patches (3 v lithium Ion battery to keep ram chip enabled lasts ~ 10 years (experience says double that BTW)).
You should be able to get it going again, MJMP and others will help. Dumb question, but have you got the memory battery +ve and -ve the right way ?
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Thanks for the reply. I am sure that the battery is installed properly. I was trained to do circuit board repair by the U.S. Air Force. I think the transformer may have kicked the bucket. I have replaced the fuse, because it was blown (and the unit would power up before). After replacing the blown fuse with a new one and performing the battery mod with the correct polarity, the unit will no longer power up.
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Hey wtolp, If the transformers cactus you can get a new US voltage one here (http://www.marshalljmpmodshop.net/miscellaneous_parts_and_replacement_tubes.htm), I don't think the MDRT (a much better transformer BTW) works for MP1 Classic. Well obviously fuses blow for a reason. MJMP or others should be able to step you through checking why it blew and if you need a new transformer.
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I have a few spare 110V transformers if you need one?
Did you try to measure the voltages comming out of the transformer?
See attachment.Let me know.Don't forget these are AC voltages!!