Question about Denon AVR-900 Receiver

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DVR-900 blowing Fuse

The 6.3 A fuse on the power board keeps blowing. Any hints on where I should start to look to solve this problem?

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First check the output transistors for a short, 9 times out of 10 this is the case. Use a multi-meter on resistance. The transistors will have most of the part # on them, usually you just have to add 2S to the front example an "A1519" on the transistor would be a 2SA1519. If one is found to be bad replace it's complement also even if it checks good (unless you have a transistor checker that will check it for leakage). Good Luck.

Posted on Feb 03, 2009

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If you look closely at your board you will see four diodes that just after the fuse and befroe the Big capaictor(filter cap.) One of these four diodes must be faulty as the fuse keeps blowing. the diodes are responsible of current limitation drawback. So there must be current flowing back to the fuse that makes it keep blowing.
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Thanks for using Fixya.

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I have an fisher RS636 when i cut it on it stay's on for 8-9 seconds and cuts off. 1 glass 125v/5amp fuse blowd which i changed. i am attempting to fix it myself does anyone have an idea were i start?...


Unplug the unit. Start in the power supply. Unplug any cabling going to the PS Board to minimize erroneous measurements. I am hoping you are technical since you are going to screw around with the electronics so let's get to it. Perform a diode check and capacitive check on main filters to make sure the bridge rectification is good. Next, analyze whatever V (TDA, STK, etc) output module may be on the power supply board (PS).

Should everything look good, keep the cabling off the PS Board but make sure the grounding leads are still tied to it. Replace the fuse with same E and I ratings. Plug in the power supply. Fuse blows? If so, you missed the problem on the PS... go back and run diagnostics (continuity on discretes). If it didn't blow, hook up the cabling the way it was and turn it back on. Fuse blow? More than likely it will be your output transistors. Perform tests while unit is unplugged (diode function).

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