Question about HP Jornada 548 Pocket PC

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AC Adapter Buzz Noise

Hi, 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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The jornada 548 power adapter should not be buzzing - it should be very quiet.

Posted on Sep 12, 2005


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1 Answer

Buzzing noise

It could be feedback from your speakers... Make sure your power cord is grounded and if you have a sub or surround sound don't set the ac power adapter near them.

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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.

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I recently connected my satellite reciever to my

Iassume you mean you hear the buzz independently of the audio program - simply connecting the cable causes the buzz?

If tanything in the mix is powered from different AC sources you may have a different ground potential. Sometimes manipulating the orientation of one or more ac plugs will solve hum problems.

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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.

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.

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.

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Hi there, Your ac adapter is damaged & that's why power does not transfer in your notebook. The capacitor of adapter is burned & that's why the noise started. Thanks & waiting for your feedback.

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Need to check the cooling fan.
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