5120 code error - HP LaserJet 4650n Printer

Any of these error codes (51.20 51.21 51.22 51.23) points to a failure with one of the laser scanner assemblies on the HP Color LaserJet 4610 an 4650 series. To solve these error codes, replace the corresponding laser scanner. Sometimes when the laser scanner fails you will also hear loud noises (often higher-pitched noises like screeching sounds); the noises can be another sign that the laser scanner needs replacing.


51.XY
PRINTER ERROR
For help press
alternates with
51.XY
PRINTER ERROR
A printer error has occurred.
X Description
1 beam detect error
2 laser error
Y Description
0 no color / black
1 Press to continue.
2 Turn the printer off and then on.
3 Reseat the connectors between the
laser/scanner and DC controller PCA
(J1009 - J1012).
4 Replace the defective laser/scanner
assembly. Calibrate the printer after
replacing the laser/scanner.