Power Service Check - Lexmark 4076-0XX User Manual

4076-0XX

Power Service Check

FRU OR PROCEDURE
1 Power Supply
2 Operator Panel
3 Print Head Cable
Simm Card
Parallel Cable
4 System Board
ACTION
Disconnect J11 from the system
board and check the following volt-
ages on the power supply cable:
J11-1 to GND = +5V dc
J11-3 to GND = +24 V dc
If you do not have correct voltage,
replace the power supply. Be sure to
unplug the machine before you recon-
nect the power supply to the system
board.
With the power button depressed,
check for 0 ohms at J10-11 on the
front of the operator panel connector.
If the reading is incorrect, check the
operator panel cable for continuity. If
the cable has continuity, replace the
operator panel.
Turn off the printer. Disconnect one of
the listed components and turn on the
printer. Look for a symptom change.
Check the failing part for shorts and
replace as necessary. Repeat this
procedure for the remaining listed
parts.
If the symptom has not changed,
replace the system board.
Diagnostic Information
19