HP Colour LaserJet 4600dn printer problem

the dc controller is not communicating with the formatter.if you power off the printer and uplug for a while sometimes this message disappears. if not you will need to Replace the formatter with firmware DIMM or Replace the dc engine controller board.

Calibration bypass
During certain diagnostic procedures, you will need to bypass the automatic calibration that is
performed whenever the printer is turned on.
To bypass calibration
1 Turn the printer on and watch the control panel display.
2 When the display begins showing the memory count, press and hold until all three lights on
the control panel are lit.
3 Press .
4 Press PAUSE/RESUME. The display should show SKIP DISK LOAD.
5 Press until SKIP CALIBRATION is highlighted.
6 Press . The printer will skip calibration and then continue its power-on sequence.

Please refer here for further details if required

Let me know if any further clarification is required. Hope this helps!
CreativeTECH

Hi There, Please follow the below steps to fix this issue :
Action : 1. Press the green (Select) button to continue. 2. Turn the printer off, and turn it on again.
3. Perform a cold reset : a.Turn on the printer. b.Watch the control panel. c.When the memory starts counting, press and hold the (Select) button. d.Continue holding the (Select) button until the Ready, Data, and Attention lights flash once, and then stay on steady. e.Release the (Select) button when the Ready, Data, and Attention light are on steady. f.The control panel will display SELECT LANGUAGE . g.Press (Down Arrow) button once. The control panel will display COLD RESET . h. Press (Select). The printer will perform a cold reset and then continue its power-on sequence. 4. If this message persists, contact an HP-authorized service or support provider.

The printer counter needs to be reset by going into menu and finding resets. Then toggle down until you come across Transfer Kit & press ok.

Sorry, my friend, there is no way to force it go B/W and override the error message.

plug network card again, after try to change theother, because ROM card error

No guarantee this will fix your problem, but the last time I experienced this problem it ended up being one of the toner cartridges. I replace her refurb. toners to OEM brand.

From Woody Friesen:
Did the printer have a rough ride? HP's service manual suggests this to be a laser error on the yellow laser scanner, though these printers usually withstand shipping without any problems. Just for grins, if you can get the printer to get to READY again, run the printer through a complete calibration (from the control panel: Configure Device/Print Quality/Calibrate Now). The DC controller circuit board is also a possibility, but given the error code popped up almost as soon as you plugged the machine in suggests the yellow scanner has suffered some sort of mechanical damage from the trip. If the calibrate routine doesn't remedy the problem and you want to be sure, you could do the major disassembly required and swap the yellow scanner with the scanner for another color in the printer and if the error code changes to 51.2M (magenta), 51.2C (cyan) or 51.2K (black) (the code will reflect which scanner you exchanged with the one in the yellow position) you'll have confirmed the scanner is the problem, or if no change, then the DC controller is next in the chain.

This error means there is a problem with the cyan laser beam.
You can take a look at this link from HP and try to solve your problem:
http://h20000.www2.hp.com/bizsupport/TechSupport/Document.jsp?lang=en&cc=us&taskId=110&prodSeriesId=74301&prodTypeId=18972&prodSeriesId=74301&objectID=bpl11648#A24

It is a fan failure