| Electronics > Repair |
| Diagnosing NAD receiver -- unexplained shut-downs |
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| MathWizard:
OP do u have a soldering iron ? I often solder on little test leads to PCB's, especially around SMD chips, trying to probe that stuff is easy to screw up. But yeah if it was me, with the circuit un-powered, with the DMM and schematic especially, I'd find some key points of interest, and area's like big supply rail caps, and solder on a few test leads, then power it up and see what the various voltage rails are doing. See how much AC ripple is on those caps after the various rectifier's. If this is some big spread out, single sided PCB thats mostly through-hole, well then it should be a joy to work., and not that dangerous. When checking voltages, I pretty much always have an alligator clip on the common ground, and then just probe around with 1 hand/probe. And some stuff I just turn off the power if I need to go moving alligator clips, just mind some caps can still be charged for a long time, most will have plenty of stuff to drain them tho. |
| MWH901:
Hello all... waking up this old thread to see if OP was able to find a solution or if anyone else had any ideas. I have the same receiver with the exact same problem. Initial successful power-on, then shut down within 30-60 seconds and total inability to restart for an extended period. I've hit just about every part of the board with freeze spray just to see if cooling something off would help, but so far no luck. Thanks in advance... |
| JordanW:
--- Quote from: MWH901 on June 18, 2024, 03:58:08 pm ---Hello all... waking up this old thread to see if OP was able to find a solution or if anyone else had any ideas. I have the same receiver with the exact same problem. Initial successful power-on, then shut down within 30-60 seconds and total inability to restart for an extended period. --- End quote --- Unfortunately, even after replacing a few possibly suspect capacitors, I wasn't able to get mine working. I ended up selling it for parts. Hopefully you'll have better luck with yours. Please share your progress here! |
| MWH901:
--- Quote from: JordanW on June 18, 2024, 04:57:40 pm ---Unfortunately, even after replacing a few possibly suspect capacitors, I wasn't able to get mine working. I ended up selling it for parts. Hopefully you'll have better luck with yours. Please share your progress here! --- End quote --- Thanks for responding! Sorry to hear you weren't successful. I'll certainly post if I can find a solution. |
| wasedadoc:
The OP never replied with result of my suggestion to short collector and emitter of the transistor driving the relay coil. |
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