I have a very frustrating situation. Which is, I have been unable to resolve a grounding problem which results in a low-pitch humm when I connect my pc to my stereo system using an audio cable.It does NOT occur when I connect my iPod to the stereo using the same cable.There is no humm when I normally play audio on my pc.I have an HP Pavilion (Media edition) and a Pioneer stereo.I connect to the “CD” bank on the stereo since that is (presumably) “digital”.I have sent the signal from the PC to a radio via a wireless FM transmitter and then connected it to the stereo and there is no humm.Therefore, I believe it’s a ground fault from the “hard-wire” connection.I have done the following:
Swapped out sound cards
Connected a grounding wire from the pc tower to the stereo
Connected a grounding wire from the pc to the AC outlet
Connected both the pc and stereo to the same AC outlet
I am at my wits end.How do I diagnose/solve this issue.
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The first check is for proper grounding...If you have a multi-meter digital or with an analog meter, set it on the lowest scale...Place one lead on the clean top of the negative battery post and the other on bare metal of the chassis (fender bolt is proper)...meter must read less than 50 ohms...Continue holding lead on battery - post...Place the other on clean metal of engine...Same results; less than 50 ohms...If reading is high (1500 ohms;example) The vehicle needs 2 ground straps, one between - battery post and clean metal of chassis the other from chassis too engine...Without knowing if grounding is OK truck will have symptoms as you described...saailer
depending on the model number...sony had a bad run of amps that would exhibit the problem you are having...the fix was that it had a grounding issue with the various circuits within...there is a method we used to repair these sets where we would "bond" all of the grounding connections on the pc board with lengths of wire to one main grounding point...another possibility is that there are cold solder connections that are causing the unit to shut down. A cold solder connection may have conductivity when the unit is off, but when the unit heats up then the connection is lost resulting in shut down....I would recommend taking the set to your nearest service shop and get an estimate
For easy testing, purchase a low voltage test light. It resembles a screwdriver with a wire pigtail. Clip the aligator clip on the pigtail to a grounding point on the car and use the probe to test for power in your light sockets. If there's power, your problem could be loss of grounding. You need both a power wire and a grounding wire to complete the ciruit. Look for a damaged or severed grounding wire.
This humming noise is the cause of a bad ground. try a new grounding location. The shorter the ground wire the better. Make sure the connection is metal to metal. I have had the same problem out of competition systems. Good Luck
The all-in-one product display always reads "Initializing"
This may occur in a low power situation. Follow these steps in order to determine the cause:
Verify that the computer and the all-in-one product have a three-prong power plug.
the product cable from any power strips or surge suppressors, and plug
it directly into a grounded (three-prong) wall outlet.
If the all-in-one has an ADF with an external cable plugging into the back of the product:
Turn off the unit.
Unplug the power cable from the wall outlet.
Unplug the ADF cable from the back of the product.
Plug the ADF cable to the back of the product.
Plug in the power cable, and turn on the power.
If no change, the problem is not the ADF.
If the problem clears, turn off the all-in-one, unplug the power cable, and plug in the ADF.
If the error returns, the ADF is defective. Contact HP Customer Care to get the ADF replaced.
the USB or parallel communication cable from the back of the all-in-one
and try to power up the all-in-one. The computer may be grounding out
through the communications cable. If this corrects the issue, check the
grounding of the computer and outlet.
If the above steps did not resolve your issue, contact HP for additional issue verification or the servicing of your product.
If your sub or its amplifier is placed too close to the transmission box, this situation can cause interference. I suggest that you buy a ground loop isolator or an RCA filter. If the problem is about grounding, then you have to buy a ground loop isolator. Otherwise, an RCA filter can solve your problem. First of all, the problem has to be diagnosed.
On many occasions high pitch interference is a result of bad wiring and grounding problems. Check to make sure that you followed the manufacturer's instructions concerning grounding and installation of the amp, and if possible try and install it at another location in your house, using other electricity sockets.
If the problem is solved by relocating the system, you might be looking at wiring problems (audio equipment can be very sensitive to that), if changing anything in the installation process solved the problem then the problem was probably due to bad grounding and "loose" electricity.
Try making the installation as "clean" as possible, avoid tangled wires and stressing a single socket with too many electric appliances.
If the problem persists, and you are still under warranty, I suggest contacting your local Yamaha dealer. If you're out of warranty I suggest locating a professional repair person.