Lexmark T52 Series, Service Manual

Page: 71 / 334

Diagnostic Information
2-43
4520-xxx
Dead Machine Service Check
Note: If a high-capacity input tray is installed, remove the option and
check the base printer for correct operation. If the base printer
operates correctly, go to
“High-Capacity Feeder Input Tray Service
Check” on page 2-66
. If the base printer continues to not operate
correctly, remove any other attached paper handling options.
Observe all necessary ESD precautions when removing and
handling the controller board, engine board or any of the installed
option cards or assemblies.
Note: If the LVPS is blowing fuses, remove the LVPS from the
printer. Check the metal LVPS shield for signs of damage that
causes the shield to touch components on the LVPS board
assembly.
FRU Action
1 Line Voltage Check the AC line voltage. If the line
voltage is incorrect, inform the
customer.
2 AC Line Cord Check the line cord for any signs of
damage. If correct, check the
continuity of the line cord and
replace if necessary.
3 +5 V dc at any Option
Connector Check for +5 V dc on any of the
option connectors. The easiest to
access is the envelope feeder
connector located behind the lower
front door. If +5 V dc is present at
any of the connectors, go to step 9. If
+5 V dc is not present, go to step 4.
4 +5 V dc at the controller
board test point Check for +5 V dc at the +5 V dc test
pad located on the controller board.
If correct, go to step 9.
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 blown.