Hi I want to power a Siemens micromaster 420 inverter with batteries. What voltage do I need to connect to the DC + & DC- ??

SOURCE: Do I need a battery to run the PC Tablet?

THe manual for your specific model can be found here: http://support.fujitsu-siemens.com/Manuals/ShowDescription_KMT.asp?DokuID=202607 Documents for othe models and languages can be found here: http://support.fujitsu-siemens.com/com/support/manuals.html

SOURCE: No power.

My 3 year Sceptre 27" died. Local TV tech said it was the power module. Charged $25 for the diagnosis and wanted $190 to fix it. Took it home, popped the screws and the module almost fell out. It's a simple plug'n'play!!! Found a new module on eBay for $65 shipping included.

SOURCE: xerox 420 dc ports?

If it's a DC that means Digital Copier, It does not have print capabilities. That would be the ST versioin.
A 420 DC is simply a copier. It can however be upgraded to an ST.

SOURCE: how to get a siemens micromaster 440 up and running

Hello Stephen The first thing you have to do is make sure that the motor is connected for 220 volt three phase How do you know? your motor must have this connection info on the name plate It must show 220v Delta connection and 380 or 400 v star connection. connect your motor in Delta ie the motor connection links are connected from U 1 to V2, U1 to W2 and V1 to U2. Ok Now for the restof it You have asmall book that came with the inverter so go to page 9 and you will see the drawing for mm440 at the bottom you will see the connection for the speed pot. which is 1,2,3,4, wire in as shown make sure the wiping connection is in 3..now wire in a switch across 9 which is the common and 5 this starts and runs the inverter when you open the switch the inverter will ramp down and stop.... IF YOU look at page 8 it shows how delta and star is connected at the motor..... now go to page12 for this you must have the power on to the inverter.. as you enter the parameters they come up in sequence as you enter the info...on par 700 put in 2 also at 1000 put in 2 set p1080 at 0.0...p 1082 at 50 P3900 at1 This should get you up and going
Sean Reihill

SOURCE: I changed my macbook screen,

This could be a backlight issue, an inverter issue or a logic board issue. Look at the screen closely, if there is a faint image it's either a backlight issue or inverter issue. To weed out between the two you can just order on inverter, they're 20 bucks on ebay, if that doesn't work, replace the backlight. Maybe the new screen was not wrapped right when it was shipped, that can easily break the backlight bulb. make sure you connected the inverter to the white and pink wires correctly. Backlight repairs are somewhat difficult. As much as I would like to be able to tell you a quickfix that will solve backlight the problem, it's a pretty arduous repair that requires 1-2 hours for a trained person. It's feasible to do it yourself if you're tech savy, but you'll most likely have to google for guides that show you exactly how to replace the backlight step by step. I work for Mac Repair NYC and i have to fix this problem a lot, it's so easy to break the lightbulb in the process.