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60Hz hum - Advent AV190

Hi,

I have an Advent AV190 system that has functioned very well for a long time. Suddenly it developed what I would term a constant 60 Hz hum. I checked all signal grounding and everything was fine, so my first thought was faulty smoothing in the power supply.

I found that it had 2 supplies: one for the bass system and another for the small speaker system. Lo and behold there was a smoothing capacitor that broken away from the print at one end. I thought that was it and replaced it, but it made no difference.

I suppose I could go on and replace all of the smoothing capacitors, but it may be something else? I have checked the diodes that form both the bridge rectifiers and they are O.K.

My question is, does anyone happen to have a copy of the circuit diagram or schematic. I have been very impressed with this unit, and I would like to get it going again rather than buy a new one. Can anyone help me? Thanks.

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  • 341 Answers

If you can isolate the inputs to the bass amp would give u a hint. I suggest try to check all components (out of circuit if possible) of the power supply.

Posted on Sep 08, 2008

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How to replace the keybord on an advent 9517 laptop


Advent laptops are manufactured by DSG International, which owns the names to other name-brand computers such as Acer and Hewlett-Packard.
The Advent laptop keyboard has integrated mouse touch-pad functions that allow you to move the mouse around the screen with your fingers.
Function keys at the top of the board contain alternate ways to exit and enter software applications.

Function Keys
The Advent laptop keyboards function keys are "hot keys" that act as shortcuts to applications and functions on the computer. The function keys sometimes don't work and won't carry out the function assigned to the key. This problem is considered a hardware malfunction, and the solution is to replace the keyboard or use a universal serial bus (USB) keyboard for the laptop. b> Malfunctioning Keys b> Advent keyboards are made of thin plastic. Striking the keys too hard will cause the keys to break or stick awkwardly in the housing unit that supports the keyboard. When these keys get stuck in the housing unit, a pin tool can easily set the keys back on track. If there are too many keys that get stuck or broken, you can purchase a replacement Advent keyboard and have it installed. b> Mouse Problems b> The mouse is located at the bottom of the Advent keyboard but is connected to the keyboard data strip that sends information through the keyboard unit to move the mouse on the screen. If the mouse malfunctions, check the connector under the keyboard to see if it is loose. A loose connector can cause the mouse or other keys not to function on the laptop. b> Electrical Shortage b> An electrical shortage can cause an Advent keyboard not to work properly. A shortage is when the main board of the laptop is not getting the voltage needed to efficiently operate the computer. When this happens, certain devices underperform or become inoperable. Check to see if your power supply is extremely hot or if your system heats up around the keyboard. If so, replace the electrical adapter. b> Wire Damage From Keystrokes b> The wire that is responsible for the liquid crystal display (LCD) on the Advent laptop extends from under the middle of the keyboard to the LCD display unit. This wire is unprotected and can be damaged from striking the keys over the wire. When this happens, the display will not show the correct colors or the screen will go black. To eliminate this problem, purchase a keyboard cover that fits the keys to relieve the pressure between the keyboard and video cable. b> Keyboard Drivers b> Problems have been reported with upgrades from Windows Vista to Windows 7. Windows 7 will not recognize the system drivers that operate the Advent keyboard. To get the keyboard to work, you must load the old drivers in Windows 7 Safe mode, which is used anytime there is a hardware or software discrepancy. Advent keyboard drivers can be loaded from the original restore CD, which is included with the system at the time of purchase.
http://www.laptopkeyboard.com/Guides.php/Advent/Advent Series/9517 (Black)/KBAD3

Jan 29, 2013 | Computers & Internet

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Hi i have a ADVENT Modena M201 red laptop and i have a built in webcam but it wont show anywhere on the system where can i find it?


in win 7 look in the control panel under "devices and printers" it may be in listed in there. if not then you will need to review user's guide or visit the advent's web site for more help or to get a new user's guide.

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1 Answer

My number keys have suddenly stoed working only 5 6 and0 work also the letter rhyming with tea won,t work and the backsace button


It sounds like your keyboard has probably failed, and needs replacing.

In the short-term, you could get hold of a USB keyboard and plug that in to use instead.

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1 Answer

What function key do I press to restore the operating system on an Advent milano W7


Hi,

If your are not compatible with how to restore, Go to the link and follow the steps.

http://windows.microsoft.com/en-US/windows7/products/features/system-restore



Thanks for using FixYa.

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Hums are usually related to power, but not usually the actual power adapter. It's most commonly a "ground loop" issue, with the infamous 60Hz hum. The solution for this sometimes is to try plugging the keyboard (or amp) into a different power outlet, perhaps on a separate circuit.

Also try an audio cable of higher quality, which may have shielding or braiding in it to reduce external noise and cancel out internal noise. Also, shorter cables tend to produce less noise than longer ones

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1 Answer

Annoying hum from speakers w/system off


The big electrolytic capacitor(s) in the power supply. The filter out the 50/60HZ hum in the mains, so you could be hearing the mains hum!

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Humming through speakes when on auxillary


Most humming in North America is either 60Hz or a harmonic of 60Hz. The number one cause of humming is a poor common. On co-axial cables this is the outside connection where as the signal is the male post in the centre. Corrosion, oxidation, poor contact are all possible things to check.

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Hi

Try this my friend,

Press F12, Num Lock, and FN at the same time.
OR F12 and Num Lock/ Scroll Key.
OR Hold the Ctrl and Fn key down together and press also
the Ins(Num LK) key.

Post me whatever the result is... so we could Fixya the problem.

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50Hz to 60Hz conversion


Hi, Your idea is basically sound and should work as long as the UPS originally is designed to produce 240V 60Hz and has its own built in timebase. The reason is that the input as long as the voltage matches makes no difference (50 or 60 Hz). By design, the UPS converts the input voltage to DC to charge the internal battery. The battery then powers an electronic circuitry that produces the 240V 60Hz. The input is then isolated from the output in terms of frequency. This is a common design, however, there are some (not many) that uses for its local oscillation sampling from the source and therefore will replicate the input frequency to its output, but very rare; it's better that you know they exist. Hope this be of some help/idea. Post back how things turn up or should you need further information. Good luck and kind regards. P.S. The only problem with 50 and 60 Hz is heat buildup which is tolerable and still within safe parameters. The only time the 50/60 HZ makes a big difference is when motors are used, timers such as in the early designs of microwave ovens, washing machines, etc., pumps and other highly inductive consumers. Most electronic devices converts the AC input to DC and therefore the frequency has negligible effect. Of course others may see it differently.

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Spkrs quit receiving signals


Hi, assuming you can open the enclosure of the Advent, work on the amp section (please make sure you've isolated the power supply and you will be working with the low voltage section of the circuitry only.) Inject an audio signal, it does not matter where in the amp section, just try the different solder points of the small capacitors normally in the 1uf value. at least one of them should give you a good amplified output from the speakers. In the absence of a signal gen, you may want to try (with care)using your bare finger which should produce a humming sound of about 60HZ or a slight thump in the speaker. If such a sound is produced, then the amp is good and the powersupply is doing its work. You have now isolated the problem to the 900MHz receiver. Am not sure if you can purchase modular replacement in your area but you can also try the sig gen or finger method except for the front end (rf section). Re the humming sound, such a problem is normally related with the power supply section with a defective or leaky capacitor. It is also possible that the input stage of your amp is not grounded right. You actually have just to work on it in stages to simplify fault diagnosis. Since you can hard wire, why not try salvaging parts/module from one unit and putting it in the other to make at least one working while looking for replacement parts/module for the other half of the Advent. Hopes this work out for you. Please let me know how things turn up. Regards

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