Question about Audio Players & Recorders
Disassembled, cleaned and applied new grease to heat sinks. Amp worked great for a while, clipped out and now occasionally will not light up the front display. Works well until display goes out. All fuses are good, no burn spots on board. Any hints? I know the fan is failing, but don't want to replace it IF there is a major underlying issue. The amp still produced out of both channels, and does when it decides to work. Once the front display goes blank, it stops working. When testing, I was running it without the cover with a large fan cooling the unit. I disassembled the unit, cleaned everything, applied new grease to the heat sinks, etc.. Fuses are all good, still have failed to note any obvious burn marks on the board or individual components.
First of all, I would need to know the make and model number, rather than guessing. Second question, why are you driving the amp into clipping, if that's what you mean? That will destroy tweeter and midrange drivers. Certainly, if you are driving it into clipping, the heatsinks have got to be hot, and I don't believe an external fan will cool the right places. If you can get back to me with more information, you can contact me at my website, audioserviceclinic.com, to inquire about a repair. Thank you.
Posted on Nov 29, 2014
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Posted on Jan 02, 2017
check all op amps for correct voltage swing +-should be equal,test output of op amps no voltage should be present, use chasis gnd as tester neg.check voltage regulation especially 12v or 15v +-.note some amps show unequal led indications when only 1 channel connected to a load.I will try to get some more info on this specific amp because i don't know this circuit well,keep in touch as you update though.
Posted on Aug 22, 2007
Speaker fuses are generally fast-blow styles 250 volt glass
If an amp shuts down, with speakers connected, it sounds like one of the power supply lines does NOT like what it's "seeing" . Probably output transistors bad ( or module)
Take it to a tech.
Posted on Jan 08, 2008
SOURCE: Solid State amplifier problems
I would look for crossed wires or shorts on the board itself as a result of overheating. They will look like toasted circles around the pins of the board. You may not have been the first to open the amp and make a repair.
Posted on Apr 30, 2009
Tips for a great answer:
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Jan 19, 2013 | HP Compaq Presario SR5610F Desktop PC
WARNING: Before you start troubleshooting remember that you are dealing with electricity that can KILL.
The "CPU" or central processing unit, otherwise known simply as "the processor," is the primary "brain" of the computer.
Processors are very finely engineered components that are not repairable.
But replacing a failed processor is an option for the owner of any model Compaq Presario desktop computer.
Just check with HP/Compaq for the correct size and speed of processor for your motherboard before purchasing a replacement.
Turn off the computer and disconnect all cables.
Remove the cover.
Lay the computer down flat.
If there is a plastic hood covering an exhaust fan, remove it by pressing in on the indicated release tabs.
Examine the processor assembly.
The processor is a square chip that is covered by a metal heat sink with fins.
A fan will often be mounted on top of the heat sink; unplug its connection to the motherboard.
Two clips usually secure the heat sink assembly to the top of the processor.
Gently press down and slightly away on the flat end of a clip to release it.
Avoid using a screwdriver to release a clip a slip could scratch the motherboard.
Release the clips and gently remove the assembly.
The heat sink should separate, leaving the processor behind in the chip holder.
Clean the bottom of the heat sink.
Use a paper towel and a dab of solvent cleaner to remove the old thermal paste.
Set the clean heat sink aside.
Lift up the lever to unlock the old processor and remove it from the pin mount.
Insert the new processor chip.
Align the pins on the processor to the "cut off corner" or dot on the pin mount.
The processor should drop into the pin holes easily.
If the processor won't drop in easily, check the pin alignment.
Once the processor is inserted correctly, pull down the lever to lock in the chip.
Apply thermal paste to the bottom of the heat sink.
Apply enough paste to cover the area of the small gray rectangle on top of the processor.
Apply the paste with a spreader made from a piece of flexible plastic.
Spread the paste evenly to a thickness of two sheets of paper.
Check the heat sink mounting alignment and lower the heat sink onto the top of the processor.
Reinstall the mounting clips.
Reattach the heat sink fan to the motherboard if necessary.
Plug in the computer and monitor and boot.
If the machine won't boot or it emits warning "beeps," unplug the power and monitor, and troubleshoot your work until the computer boots successfully.
Shut down again and replace the exhaust fan hood.
Close up the computer and reboot.
Hope this helps
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