Lexmark W850n Manual page 111

Step Check
4 Check the bridge unit assembly top cover actuator.
Paint both faces of the actuator with a black permanent
marker.
Does the error continue?
5 Check the sensor (bridge unit top cover interlock)
installation.
Is the sensor (bridge unit top cover interlock) installed
properly?
6 Check the sensor (bridge unit top cover interlock) for
proper operation.
Perform the sensor (bridge unit top cover interlock)
test.
1. Enter the Diagnostics Menu.
2. Touch FINISHER TESTS.
3. Touch Sensor Test.
4. Touch Cover and Door.
5. Touch Door F bridge top.
Does the operator panel display change every time the
detection point of the sensor (bridge unit top cover
interlock) is blocked?
7 Is the sensor (bridge unit top cover interlock)
connected properly?
8 Does the error still occur when the power is turned on?
9 Replace the finisher controller card assembly.
Go to "Finisher controller card assembly removal"
on page 4-118.
Does the error still occur when the power is turned on?
Yes No
Go to step 4 Problem solved.
Go to step 5. Reinstall the
sensor (bridge
unit top cover
interlock).
Go to
(bridge unit top
cover interlock)
removal" on
page
Go to step 7. Go to step 6.
Replace the Replace the
sensor (bridge connection.
unit top cover
interlock).
Go to "Sensor
(bridge unit top
cover interlock)
removal" on
page 4-15.
Go to step 8. Problem solved.
Replace the Problem solved.
printer engine
card assembly.
Refer to the
Printer Service
Manual.
Diagnostic information
4024-110
"Sensor
4-15.
2-89