How to Repair a Karaoke Machine. Chances are, once your karaoke machine breaks, you will want to sing karaoke more than you ever did before. Before you decide to buy a replacement karaoke machine, you should try to repair the broken one. Be sure that the machine is really broken, and not just malfunctioning due to dirty or scratched CDs.
Check and Clean Your Karaoke CDs
Remove all of the CDs inside the karaoke machine when it stops working properly. Place one new CD in the machine and see whether the problem is solved. Overheated CDs can occasionally cause the machine to malfunction.
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Clean each karaoke CD with a clean, dry, lint free cloth. Grasp a CD by the edges of the disk. Use a straight sweeping motion from the center of the disk to the outer edge. Dirt and fingerprints on CDs can cause skipping.
Clean the CD with rubbing alcohol for stubborn dirt and dust. Pour rubbing alcohol gently over the disk to remove debris. Allow the disk to air dry rather than drying it with a cloth.
Find and Repair Scratched CDs
Locate scratches on the karaoke CD. If you can find the scratch you can avoid touching (and potentially damaging) other areas of the CD.
Polish the scratched area of the CD. You can use a very small amount of paste-style toothpaste as a polish. Apply the toothpaste with a clean, lint free cloth and rub it in gently using a back and forth motion.
Rinse off the polish with plenty of warm running water. Let the karaoke CD air dry before you attempt to play it again.
Check All Connections
Take a look at your karaoke machine's power cord. Look for splits in the cord and exposed wiring. A crack in the power cord can cause the electricity flow to the machine to vary, which makes the machine malfunction.
Repair minor cord breaks by wrapping the cord with electrical tape to keep the connection firm.
Examine the input/output connections from your karaoke machine to any TV or stereo you have it hooked up to. Make sure each connection is firm, and in the correct outlet.