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I would go to the manufacturers website and check your model number. I am a plumber and do this frequently for different pumps and other things. Most of the time you can download and print the manual. Just look for literature or manuals.
There are no official drivers Win 7 avaliable for your AIO hp DJ 3420, but you can use an alternate compatible drivers for your model ie. hp DJ 3600 series.
Read this link from hpInstalling the Printer with an Alternate Driver in Windows 7 for a USB Cable Connection.Suggestions
What have you tried to get Windows Update to work?
I would suggest the following: Go to the Devices and Printers folder, Add a printer, Local Printer, LPt1, etc...when the list of printers comes up select Windows Update. After several minutes the list of printers should be updated and the Deskjet 3600 should be in the updated list. (Also keep in mind to look under 'HP' section of the driver (hp 3600) list and not 'Hewlett Packard'). Cancel the install the wizard & select "hp 3600" drivers to install on your Win 7 system.
Hope it helps.
Some manufacturers tend to fudge the numbers and throw around the 'peak' output power as continuous and it isn't.
Peak (or surge) is the power a generator will handle as starting current (for example) for a motor and can be 120-140% of the actual continuous power.
Check you owner's manual, find the detailed specs which will normally contain the maximum continuous current rating.
If it is listed separately for 120 and 220 (240) volts look for separate current ratings for each output.
By multiplying the current(s) times the output voltages you can find the total resistive output into a purely resistive load such as an electric heater.
For example: 120VAC X 20 A=2400 watts.
If other outputs are available such as 220VAC, multiply its current rating: 10A. or 2200 watts
Adding those two results 2400 2200=4600 watts will give you the rated power of a unit.
You can also recognize stupid power claims if the engine's horsepower is given.
One (US) HP = ~746 watts.
Since no generator is 100% efficient, its a fair rule of thumb to guesstimate the available electrical power at ~70% of the engine's rating (although, this is often also wildly optimistic).
10 HP X .7= ~746 X 7 or a bit over 5,000 watts.