Hello, my amp recently blew its fuses and I have misplaced the fuses that were inside the amp. My problem is I don't know what kind of fuses to buy for the amp. I read through the manual to no avail. I even tried Geminis technical support number, but I keep getting an answering machine. Please help!
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Fuses blow when there is a short circuit. All you need to do is replace the main output devices located on the heat sink. They are the ones that will have shorted most likely. Check your speakers and wiring for that channel. Any wire cross connecting will cause that kind of fault, likewise a faulty speaker.
Any engineer will be able to do this job, providing they can find the parts. But you can check them yourself by looking for the parts on the internet.
Fuses blow when there's an overload. Mostly caused by a semi-conductor device such as a transistor or IC that has become short-circuited. Transistors are easy to spot as when an Ohm-meter is placed on the terminals the ohm-meter will behave like you have touched the test probes together!
Chances are that more than a fuse went. I would follow (internally) the path of the wires from the speaker you mentioned - inside the amp. This should bring you out to the main amp. I think you will find that whatever powers that channel is faulty.
Tough one. I repair these for a living. A number of possibilities exist. Likely output transistors are blown on the bad channel. Fuses are likely blown. If the fuses are BLACK inside, don't just put new fuses in, more damage WILL occur. This is a bit more than 'good with a soldering iron' will fix. You need to know how to test an output transistor. You need to look up the transistor type so you know what it is. A service manual will be a big help (I could not find one online.) If more than two outputs are gone on the one side, all should be changed, they are supposed to be MATCHED. Remove and replace all damaged outputs, or replace them all if two are blown. Find the driver transistors and check them for short circuits. After repair, start the amp on a dummy load of a 250watt light bulb to prevent destroying the amp if there is a problem. If you are unsure of any part of this, find an electronics technician to help.
You may have blown the inline fuses for output sound. Amps have alot of fuses under the hood. take the amp cover off and check all fuses are not blown / wire broke inside fuse. Some fuses are hidden under circuit boards on some amps, check everywhere possible to check all fuses. If all fuses are fine and no broken wires inside them, you may have loose connection where your speaker wire ports are inside the amp. Check they arent black or loose. if they black they are blown as there usually soldered (a silver colour)
You can fit a 5 amp fuse at 250volts if you can't find that one. As long as you don't exceed 6.3 amps it should be OK. It will only blow if there's a real problem. Use a quick blow if you don't know the type. Your local parts shops should stock them.
You can buy replacement 6.3 amp fuses at Radio Shack, but in a pinch you can substitute a 6.5 amp fuse. It's only slightly higher in value, so it will still blow soon enough if there's a problem.
However, this doesn't answer the question of why the original fuse blew. Fuses very seldom "just go bad", so before you start replacing a blown one you should find out what went wrong. Check the power supply rectifier diodes and filter capacitors for shorts. They sometimes break down with age or because of power line surges. Also look for shorted output IC's or transistors. If you can't do this yourself, see if any of your friends have experience servicing or let a professional fix it.
Please, don't just stick in larger fuses (or worse, wrap foil around them) when they blow. Many times I've seen what would have been a simple repair turned into scrap that way. Hope this has helped, and thanks for using Fixya!
This usually happens when there is a problem with the main power supply and is relatively rare. If you can post the make and model, I can give you some things to check if you are somewhat familiar with electronics.