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Entering the service menu is simple presutility> (touch screen) original size> (kepad) stop>0>0>stop>0>1 thepasswordfrom themanufactureris 00000000 , in the service menu select tech mode intheryowlfind thedifferentstart modes F8,F... , and you have printer select printer andacdcadjustment, pres C to clear the value and via keypad enter thedesiredvalue .
Turn the printer on.
2 As the printer performs its power-on sequence, press and hold the PAUSE/RESUME (HP Color
LaserJet 4600 models) or MENU (HP Color LaserJet 4610n and 4650 models) button until all
three lights on the control panel are lit.
3 Press . The message INITIALIZE DISK appears on the control-panel display.
4 Press The printer initializes the hard disk and continues its power-on sequence.
Try this website. www.feedroller.com. On there, if you go to HP, there's a lot of service manuals you can download,one of them being the 4600/4650. This will assist with every aspect of removal and replacement