Lexmark ExecJet II 4076, User Manual

Page: 31 / 89

4076-0XX
Diagnostic Information
19
Power Service Check
FRU OR PROCEDURE ACTION
1 Power Supply 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.
2 Operator Panel 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.
3 Print Head Cable
Simm Card
Parallel Cable 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.
4 System Board If the symptom has not changed,
replace the system board.