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RCA SP9972AW surround sound sub hums. One fuse was blown, replaced then both blown. Diode? Caps have not popped tops. Emitted typical smell of electrical burning but no signs of overheat or damage anywhere on circuit board. Schematic appreciated. Thanks, Mike

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  • theprivilege Apr 16, 2009

    Replaced both fuses, but the sub still hums

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5 Suggested Answers

osborne382
  • 306 Answers

SOURCE: Kole Q1-3000D Power Supply caps Keep blowin

you need a fuse of 300amps or higher with 1/2aut cable power supply connected to an after market altenator. also make sure the subs are wired properly.

Posted on Nov 12, 2007

robotek
  • 1512 Answers

SOURCE: Noise and popping on Sony STR-DA3ES

Sounds like its going to square wave clipping and poking a dc offset at your speakers. Happens when the amp reaches power supply ceilings. Pink noise such as "rain sound" will push the output stages and power supply to limits. If its on all channels, check power supply caps and check for dry solder joints. also look for that crappy brown hold down glue that goes conductive/corrosive. check all output stages particularly about discrete output devices that are attached to heat-sinks. They have a bad habit of dry jointing also. Good Luck

looked for a free manual on line for you
http://www.nodevice.com/manual/Sony/page139.html got heaps... but not your exact model. You may be able to cross reference one

Posted on Feb 03, 2008

bestdarngood
  • 3037 Answers

SOURCE: JBL sub PSW-D110 hums, and the fuse is blown

here is the manual, I am looking for a more detailed version

Posted on Mar 25, 2008

SOURCE: Blown Pioneer Amp

Cambia los ICs amplificadores de audio

Posted on Apr 04, 2008

SOURCE: TV will not power on

The MZ73L is a posistor, its basically 2 thermal resistors back to back. One is connected across the mains, the other one connects the deguassing loop to the mains. When the TV is 1st turned on the mains connected R is cold so its neighbour is cold, that allows a large surge of current into the degaussing coil. The mains connected one rapidly gets hot and heats up the other one, this increases the resistance of it and the current being dumped into the degauss coil fades away. As the 1st one is a heater it will get hot and you will see signs of heat on the PCB, BUT its still a very good place to start. The heat is normal, but if the 1st ceramic disk in it has died then you will short the mains and blow the fuse with it.

Posted on Apr 20, 2008

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