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The only literature I find from mfg is instructional. However I gather the unit has an external power supply (wall wart).? If so, it is most likel cause. Check ower supply output with a DMM and replace if defecrive.
Here is a quick and simple way to code your wall warts (transformer power supplies for drills,camera, electronic items etc). I have many wall wart style chargers and sometimes I forget which item they go too. I have lots of guitar effects, bass effects, camera, camcorder and much more. Now after I have figured out what they go to, I buy multi-colored tie wraps and put one color on the wall wart and the same color on the tool or device it goes too. If I run out of colors I buy colored tape and do the same thing and you can resuse colors that way. It has helped me eliminate a frustrating situation.
ALWAYS start with the "easy" things 1st. Is the AC outlet on the wall working properly? Is the "wall-wart" power supply working correctly? If no defect is found, check the DC power jack located on the rear of the keyboard. Does it seem to be loose or does moving the power supply jack up/down cause any change? New wall-wart power supplies can be purchased from Radio Shack and usually at a lower price than the original factory replacements.
Next step would be to check for power from the wall wart (external power supply). Note the output voltage indicated on the power supply, then check for that approximate voltage with a multimeter.
A replacement power supply can be found at most electronics retailers. Make sure the polarity matches, ie positive tip or negative tip, and the plug must match dimensionally. Make sure a replacement can supply the current that the original did (rated in milliamps - MA, or amps A). Ideally an exact replacement would be best if that is the issue. Be careful, and don't crack open that power supply!
It's actually the opposite. 1/8" jacks are almost always positive tip. I think you are best off using a 9VDC supply. If the voltage is not staying constant at 9 volts it could certainly do damage. If the supply you used was a negative tip positive sleeve you may have burned out a component or two...and more voltage than recommended could have done some other bad things. If it does not work with a 9VDC supply with the correct polarity you can fix it yourself if you have electronic experience. You could also send it to me and I'll fix it at a reasonable rate.
These 2Wire devices are known to have their wall-wart weaken over time. Although you can measure the proper voltage coming from the wall-wart, when you load it with the DSL modem, the actual voltage drops giving you the red power light. The green DSL light may or may not be accurate while the DSL modem is not getting the power it needs. Look online or go to a store like Radio Shack for a replacement wall wart.
Copy the entire address below, paste it in the address box. It will take you to the Kraft tech 3.6v cordless screwdriver web page. From there you can order a new charger It is listed under replacment parts. I think it lists for $3.38.