Bought new AC adapter but connected it with wrong polarity
I went to Radio Shack with my jukebox and AC adapter which cord was broken. Employee showed me adapter with same voltage and offered to plug it in to see if batteries would take charge. He connected the tip with wrong polarity and after a few seconds it smelled like plastic was burning inside. Now jukebox only shows "Jukebox Version:5.08" in the display but does not show me playlists as before. Is this something that can be fixed? Is there a fuse or something that can be replaced?
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Not a problem. Take the base unit with you to Radio Shack and they will get you a proper replacement. (The numbers on the plug in to the unit will say how many volts Direct Current are required to operate is properly and the tag underneath will also state how many milliWatts of power are required at that voltage.) The key is buying the proper plug in end that fits the socket. Radio Shack has units with several socket tips so you may select the proper one. Make sure the polarity of the socket plug you use matches the wire polarity... the stripe on one side of the power cord is the + side on the socket tip.
Radio Shack sell universal AC adaptors. Just be sure that you select the correct voltage and that the polarity on the power plug is set correctly. Most AC adaptors will have the center of the plug as +, but not all. The Radio Shack universal unit allows you to switch the polarity of the plug by just changing how it's connected on the end of the wire. Incorrect settings could destroy your player.
If the radio does not work with headphone then the external jack for audio may have broken loose from it's soldered points. Simple re solder may make the repair. Beyond that it would have to be diagnosed by a technician.
Unless your have some technical background and a multimeter, you are risking at least the battery pack of your laptop and worst case, the laptop itself.
Most devices that accept an external adaptor are somewhat protected against applying the wrong polarity of voltage but that protection is primitive and depending on the 'universal' (this really should be 'multipurpose-not 'universal) adaptor used, the protection itself can fail, exposing the circuitry inside the laptop that controls the voltage from the adapter to damaging voltage; this would get much more expensive than replacing the original adapter from the manufacturer of the laptop.
You did not mention the brand/model of laptop you have and with only the adapter listed, we can't help you much.
I would suggest Radio Shack or similar local electronics store that specializes in electronics for hobbyists(meaning Best Buy and Circuit City would not be my first choice). The trick will be to match the output voltage and amperage, which should be listed on the label attached to the unit (sometimes on the bottom) or listed on the old home AC adapter if you still have it. The other thing to keep in mind is the size of the plug connector which the adapter uses to connect to the unit. Take the unit to Radio Shack and they should be able to figure out which AC adapter is right for your unit.