Lexmark 4039-1XX - Manual (Page 29)

Diagnostic Information 15
4039-1XX
Black Page
Black output is usually caused by an incorrect high voltage in the
printing process, resulting in toner development on the entire
photoconductor drum. Check the condition of each HVPS contact
and make sure they spring back when pressed. Check the continuity
of the HVPS cable. Make sure the following voltages are correct; if
they are not, replace the system board.
Make the following voltage checks while printing and again while
idling. If the voltages are not correct, replace the system board.
10P
10R/12R/12C/
12L
16L Voltage
J14-5 to J14-4 J20-5 to J20-4 J17-5 to J17-4 +24VDC
J14-6 to J14-4 J20-6 to J20-4 J17-6 to J17-4 +24VDC
10R/12R/12C/
12L
16L
Voltage while
Printing Voltage while
Idling
J20-1 to J20-4 J17-1 to J17-4 Less than
1VDC 21-26VDC
J20-2 to J20-4 J17-2 to J17-4 Greater than
1VDC Less than
0.5VDC
10P
Voltage while
Printing Voltage while
Idling
J14-1 to J14-4 Less than
5VDC 0VDC
J14-2 to J14-4 Less than
5VDC 0VDC