Question about Audio Players & Recorders
As soon as I press the power button the 6amp fuse on the power board will blow. I have replaced it once and it keeps happening as soon as the power button is pressed. Any ideas how to figure out what to replace (other than the whole thing).
That is usually caused by shorted output transistors. What brand/model do you have?
Posted on Apr 29, 2013
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Posted on Jan 02, 2017
SOURCE: unit wont turn on
The board you are looking at is the standby cct and power switching PCB. It sounds like that is working, so you have probably lost power to the transformer primary or the transformer is open circuit. Check for blown fuses and replace with exact same type and rating.
Be sure to unplug at the wall before touching any internals!!
If you can find no blown fuses, the power transformer may have failed. Good luck, get back to me here is you need any more advice. Thanks for using "FixYa"
Posted on Feb 18, 2008
SOURCE: Yamaha RX-V420 No power
If the standby voltage exists, the next step is to see whether or not the clock is working. Find the main micro chip. There should be a 3 legged crystal close by. You should see this oscillate (use a scope). No oscillation = no micro control = no turn on. It is possible that the micro is bad or the crysal is bad. Also, check to be sure that the output transistors are not shorted. It is also possible that these are preventing the system from turning on.
Posted on May 12, 2008
SOURCE: JVC RX-318 keeps blowing fuses
could be several things, speaker wires touching,shorted output transistors, a shorted rectifier diode,bad filter caps in the power supply,those are the most common
Posted on Jan 06, 2009
This condition, may be produced by defective components (Q506, Q507). you can remove those transistor, replace the fuses, power-on and wait for relays click. if the fuses not blown again, them replace both transistor.
Posted on Mar 19, 2009
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