Dead Machine Service Check - Lexmark T520 - 20ppm 8MB Par USB Pcl6 Ps3 Ppds Service Manual

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
Check" on page 2-66
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
1 Line Voltage
2 AC Line Cord
3 +5 V dc at any Option
Connector
4 +5 V dc at the controller
board test point
5 +5 V dc at the engine board
Test Point
6 LVPS Fuse F1
"High-Capacity Feeder Input Tray Service
. If the base printer continues to not operate
Action
Check the AC line voltage. If the line
voltage is incorrect, inform the
customer.
Check the line cord for any signs of
damage. If correct, check the
continuity of the line cord and
replace if necessary.
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.
Check for +5 V dc at the +5 V dc test
pad located on the controller board.
If correct, go to step 9.
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.
Remove the LVPS from the printer
and check fuse F1. Replace the
fuse, if blown.
Diagnostic Information
2-43