Lexmark 4039-1XX Manuale Utente

Service Manual

For handle-mounted sensor: The voltage at sensor card J2-3 (pin 1 
is the bottom pin) should be +5VDC, and the voltage at J2-4 should 
be (12L) 10 to 14VDC (16L) 22 to 26VDC. If these are incorrect and 
the cable has continuity, replace the system board. The voltage 
between J2-1 and J2-2 should be +5VDC when the light beam is not 
blocked, and near zero when it is blocked (the voltage takes 15 to 25 
seconds to change to the low level).

For redrive-mounted sensor: make sure the plastic bails and guide 
are in good condition and that they guide the sensor flag out of and 
into the sensor as paper passes into the bin. On the sensor, the 
voltage from pin 2 to pin 3 (pin 1 is the bottom pin) should change 
from 0 to +5VDC as the sensor is blocked and unblocked. Pin 1 
should always measure +5VDC.

Replace the sensor, the sensor card (on machines with latch-
mounted sensor), or the sensor cable as necessary.

Possible causes: failed LCD or operator panel card, cable or 
connector problem, or system board problem.

Replace the operator panel if POR stops with 1½ rows of pels 
displayed.

Run the diagnostic tests for the LCD and for the buttons. If only 
some buttons or pels work, replace the operator panel.

If the operator panel is blank: check for +5VDC at pin 1 of the in-line 
connector under the top cover, and replace the operator panel if the 
voltage is good. Check for +5VDC at (10P/10R/12R/12C/12L) J7-1 
(16L) J5-1 on the system board and replace the cable if the voltage 
is good.

If the voltage at the system board is incorrect, check that the LVPS is 
providing the correct voltages and replace the LVPS if its output 
voltages are wrong.