I have Jornada 548. The AC Adapter/Charger makes a buzzing noise when it is connected to the power, and the noise gets louder when Jornada is connected to it for charging. I'm thinking it's the transformer inside the adapter making the noise. Can someone tell me if this will cause any harm to my Jornada?
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Buzzing is usally AC line noise leaking into an un-shielded cable somewhere or a floating ground. If the AC plug is reversable, try that. Sometimes the buzz is from an attached device. Make sure all audio cables are plugged in tightly at each end and routed away from or at right angles to any power cords and away from other sources of strong magnetic fields like TV's. I've also seen variable track lights induce noise but it's usually minor.
If it still does it with no cables or anything external attached it's an internal problem.
The power supply may fail as the capacitor that smoothes the rectified AC current is not working correctly and causing horizontal moving lines and the buzz. If you can repair it by replacing the capacitors, all to the good but a switch mode type unit will possibly be available from an electronics shop.
That "speaker looking thing" above the drivers head on the headliner is a part of the climate control system.
Here is the GM bulletin regarding it if you are running in to these issue:
Document ID# 1639237
Subject: Buzz Noise From Headliner Above Driver - keywords ac air aspirator cover fan grille HVAC interior microphone sensor speaker temperature vent vibration #PIT3511 - (03/29/2005)
Models: 2000-05 Cadillac Escalade
2002-05 Chevrolet Avalanche
2000-05 Chevrolet Silverado, Suburban, Tahoe
2000-05 GMC Sierra, Yukon, Yukon XL, Yukon Denali
The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in the PI.
Condition/Concern: Dealer or customer may comment that they have a buzz or vibration noise emanating from the headliner in an area that looks like microphone or a speaker.
Recommendation/Instructions: The plastic escutcheon grill, which is round and about the size of a half dollar and located just above the driver to the left, is the interior ambient temperature sensor. The sensor is used in conjunction with the automatic HVAC (C68). On occasions, this sensor has been known to make a buzz or rattle sound. The sensor uses a small fan to pull air over the sensor. This buzz noise may be intermittent.
Although it may not be possible to alleviate all of the buzz or noise from this sensor, Engineering has found that if the sensor is installed incorrectly that it may bind and cause the fan to make a buzz noise. Remove the sensor and while doing so check for any binding. Reinstall the sensor and re-test. If the noise is still present, the sensor itself may be noisy and require replacement.
Try to see if the reciever will make the buzzing/noise without anything connected to it except power, and speakers. Tune into a local radio station and see if the noise continues. If the noise has stopped, then you know there is an issue with the player or cable.