Question about Audio Players & Recorders
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Posted on Jan 02, 2017
SOURCE: Power light switches to red.
This a common problem with NAD amplifiers.
The caps dry up.Look on the protect pcb, this mounted verticaly near the rear of the main pcb, it has a metal frame around it.
Check the 4 x 10000uf smoothing caps, if the tops are not flat, they will need to be replace with 100volt ones.
Also on the right side of the main pcb around a couple of heat sinks there are other caps which dry out.
You have to remove both output modules to remove the main pcb as there is limited access from underneath.
Best of luck
Posted on Nov 09, 2007
I had very similar symptoms with my 8110, however the Green LED would
come on for approx. 1 or 2 seconds before the whole unit would appear to be
dead. If yours is actually turning on for minutes you may have a different problem or perhaps your connection is intermittent. Part of the circuit monitors the electrolytic
plates. If it detects a malfunction it shuts down. On my 8110 I found
the following. Perhaps you have a similar issue.
On the circuit board there are two connections that go from the terminal strip to the electrolytic plates. The leads on the terminal strip are quite large and it appears when they originally soldered the terminal strip to the circuit board they did not apply enough heat. Over time the solder connection deteriorated and the connection became very resistive and generated enough heat at the solder joint that it finally failed. I cleaned the terminal strip lead and the corresponding pad on the circuit board and re-soldered the connection. While I was at it I went ahead and re-soldered all of the terminal strip leads.
Posted on Jul 06, 2009
This is a classic VP930 problem.
It is caused by bad capacitors in the power supply circuit.
Open the monitor, and look at the power board. There are six capacitors. Replace the 220uF @ 25V and the 1000uF @ 16V capacitors. I would recommend replacing them with 35V and 25V capacitors respectively.
If the serial number on your monitor starts with Q8H you could also have a bad IC on the main board. Q8 on the main board is an FET in an IC package. If this problem persists solder a wire from the right side to the left side. There is one pin that turns the IC on and off. All the other pins (per side) are soldered together. Do not solder the pin on the left side that is by itself. Just leave it. Solder ALL the other pins on the left to ALL the other pins on the right.
Remember, do this ONLY if the problem persists after replacing the capacitors AND if your serial number starts with Q8H.
Posted on Sep 15, 2009
SOURCE: Split system turns off after
Out door compressor getting over heated. Check freon pressure. May be short of gas. If fan motor less rpm, replace capacitor. If condenser dust blocked,m clean it.
Posted on Jan 19, 2011
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