Question about Audio Players & Recorders
Fuses blow because of an overload. I suspect you are looking at the wrong place in the transformer and power supply. Instead look at the main power amp board on the things sat on the heatsink, they will be the cause of the overload. If they are transistors you will find one or more with a short circuit, with a simple test with an Ohm meter. Just connect the leads to the terminals of the device. If you find one where it's like touching the test probes together! You have found the faulty part.
Posted on Jan 16, 2013
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Posted on Jan 02, 2017
SOURCE: Channel short
Hi there, sounds like you may have a short to ground on the output transistors. Does it have transistors or an IC output. It is most likely that you have not replaced a mica washer or insulator. Check to ground with a meter from the case of the output devices.
Posted on Aug 28, 2007
SOURCE: pioneer m-770 will not turn on
you probably have a short in the circuit some where. you need to replace the transistor and look at all the solder joints to make sure there not damaged or cracked. i have the same amplifier and i replaced the fuse several times and it blew every time up until the last time when the 4 of the power output transistors blew. what ever you do do not try and power it on till you do all the things i told you or you will have sparks and fire. my mistake cost me my amplifier. but might help you get yours repaired
Posted on Dec 24, 2007
SOURCE: NAD 370
Hi There is no circuit breakers inside. close to front panel on a left side under plastic cover is fuse (AGC type) . Before you change fuse look at four filter capacitors in the middle of unit!!! (close to power transformer on pcb) If they are white do not change the fuse and get unit to good service center( it must be someone who knows what they doing!!!) If the caps are different color (black ,purple) you can try to change fuse. Once again if capacitors are white do not use unit-fire hazard!!!! I'm long time service guy for NAD so trust me on this one Dariusz firstname.lastname@example.org
Posted on Feb 13, 2008
SOURCE: Bose SA-3 Amp / Blown Fuse
The problem is not the transformer. You now have shorted output transistors at the very least. By corssing the wires you presented a zero(0) ohm impedence load to the output section. It quickly went into overload. Before the fuses had a chance to open up, the outputs fried. This unit will require new output transistors and perhaps the previous driver circuit will require parts as well. Figure on $20-$50 in parts plus hte local labor rate for the repair.
Posted on Oct 01, 2008
Take a look inside see if the amp uses transistors or an IC. If it uses transitors you can put a Ohm meter accross the leads (no power on) If it reads 0 (digital meter) or the pointer swings full over on the leads of any the transistors it's blown. If an IC then the thing might look damaged.
Posted on Jan 27, 2009
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