Lexmark T520 Service Manual page 78

Infoprint 1120 and 1125
Operator panel displays 260 Paper Jam after attempted feed but
before envelopes are put in the hopper OR the operator panel
continues to display "Load Envelopes" after envelopes are placed in the
hopper.
Service Tip: The kick rolls rotate during the attempted feed cycles.
FRU
1 Envelope Out Hopper
Sensor Flag
2 Envelope Out Hopper Input
Sensor
Action
Check the envelope out sensor flag
for damage, correct installation and
operation. If incorrect, repair or
replace the flag.
Check the sensor to make sure it is
installed correctly and the sensor
cable is properly connected to the
envelope system board. If correct,
perform the Envelope Feed Sensor
Test to check both the sensor and
flag. If the test fails, remove any
envelopes in the hopper, turn the
printer off and disconnect J3 from
the system board. Turn the printer
on and check the voltage at J3-3 on
the system board. The voltage
measures approximately +5 V dc. If
incorrect, replace the envelope
system board. If correct, replace the
input sensor assembly.
Diagnostic Information
2-51