Lexmark 4059-XXX - Manual (Page 60)

2-33 4059 Service Manual
4059-XXX
5 +5 V dc at the engine board
Test Point Check for +5 V dc at the +5 V dc test
point on the engine board. If correct,
replace the engine board. If
incorrect, go to step 6.
6 LVPS Fuse F1 Remove the LVPS from the printer
and check fuse F1. Replace the fuse
if the fuse is blown.
7 LVPS Fuse F1 - Continues
to blow after LVPS installed
in the printer. Replace fuse F1 if necessary. Turn
the LVPS on/off switch Off and
connect the AC line cord and turn
the LVPS On.
CAUTION: Before checking fuse F1
turn the LVPS Off and disconnect
the AC line cord. Check fuse F1. If
the fuse is blown, replace the LVPS.
8 LVPS Remove the LVPS from the machine:
CAUTION: Before making any
measurements on the LVPS output
connector, observe all necessary
safety precautions before applying
AC power. Measure the voltage on
LVPS output connector CN3. The
voltage measures +5 V dc. If
incorrect, replace the LVPS.
FRU Action