Alpine MRV-F300 Blowing fuses

2ellas · 12th November 2010, 03:13 PM

I have an alpine MRV-F300 that blows fuses just about as soon as it powers up. I opened it up and took out the board but didn't see anything that looked out of the ordinary. Any ideas what it could be or where I should start looking?

Thanks for the help!

Perry Babin · 12th November 2010, 03:29 PM

The most common fault that causes the amp to blow a fuse after the remote voltage is applied is shorted output transistors.

2ellas · 15th November 2010, 02:22 PM

You are good Perry! I appears to be a D718 transistor. I am having a bit of trouble finding one though. Any ideas where to find one? Whether it's from a piece of equipment that I could pull it from or a substitute part I could use.

Thank you for the help!

Perry Babin · 15th November 2010, 04:03 PM

I've been using the FJA4213 and FJA4313 to replace the 2SB688 and 2SD718. Mouser has them. I don't remember using them in any Alpine amps but I've never had a problem using them as subs in other amps.

12th November 2010, 03:13 PM	#1
2ellas diyAudio Member Join Date: Nov 2010	Alpine MRV-F300 Blowing fuses I have an alpine MRV-F300 that blows fuses just about as soon as it powers up. I opened it up and took out the board but didn't see anything that looked out of the ordinary. Any ideas what it could be or where I should start looking? Thanks for the help!

12th November 2010, 03:29 PM	#2
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	The most common fault that causes the amp to blow a fuse after the remote voltage is applied is shorted output transistors. __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

15th November 2010, 04:03 PM	#4
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	I've been using the FJA4213 and FJA4313 to replace the 2SB688 and 2SD718. Mouser has them. I don't remember using them in any Alpine amps but I've never had a problem using them as subs in other amps. __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

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15th November 2010, 02:22 PM	#3
2ellas diyAudio Member Join Date: Nov 2010	You are good Perry! I appears to be a D718 transistor. I am having a bit of trouble finding one though. Any ideas where to find one? Whether it's from a piece of equipment that I could pull it from or a substitute part I could use. Thank you for the help!

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