Lexmark 4059-XXX - Manual (Page 73)

Diagnostic Information 2-46
4059-XXX
Erase Lamp Service Check
Error code 928 may be displayed when the printer detects that the
erase lamp assembly, cable or engine board is defective.
Note: If the erase lamp assembly is defective, both the erase lamp
and lens are replaced as a kit.
Make the following checks when a 928 service error displays.
FRU Action
1 Cable, Front Harness Check the connection of the front
harness to connector J10 on the
engine board for correct installation.
If incorrect, repair as necessary.
Check the front harness to erase
lamp assembly for correct
installation. If incorrect, repair as
necessary.
2 Engine Board Remove the controller board and
toner cartridge from the machine.
Ground pin J10-15. The erase lamps
turn on. The lamps can be observed
through the front of the machine with
the cover open and print cartridge
removed. If the lamps do not turn on,
measure the voltage on J10-14. The
voltage reads approximately
+24 V dc. If incorrect, replace the
engine board. If correct, check the
voltage at J10-15. The voltage reads
between +15 V dc to +20 V dc. If
incorrect, check the continuity of the
erase lamp lines in the main
harness. If incorrect, replace the
cable harness. If correct, replace the
erase lamp assembly.