Lexmark C752 Service Manual page 157

Step Action and questions
8 Operator panel cable (operator panel connection) -
Make sure that the operator panel cable is seated
correctly in the connector on the operator panel board.
Is the cable seated correctly?
9 Operator panel cable - Check continuity of the operator
panel cable.
Is there continuity?
10 System board - A poor ground connection between
pin J6-4 on the operator panel board connector can
cause this symptom. Check for continuity between
pin J6-4 and ground on the board. Go to
board" on page
Is there continuity?
11 Operator panel cable - Check continuity of the operator
panel cable.
Is there continuity?
12 Operator panel assembly - Does the operator panel
display all diamonds, with the power on/status LED on
and 5 beeps?
13
Voltage checks at system board connector J6 - Go to
"System board" on page
connector J6 as shown:
Connector Voltage (display
pin static)
J6-1 +5 V dc
J6-2 +5 V dc
J6-3 +5 V dc
J6-4 Ground
J6-5 +5 V dc
Are the voltages correct?
14 Operator panel cable - Check continuity of the operator
panel cable.
Is there continuity?
"System
5-8.
5-8. Check the voltages on
Voltage (display active - LCD
Test running)
Voltage varies 1.0 to 2.0 V dc
+5 V dc
Voltage varies 1.0 to 2.4 V dc
Ground
+5 V dc
Yes No
Go to step 9 Seat the cable
correctly
Replace the Go to
"System board" panel" on
on page 4-67 page 4-49
replace the
operator panel
cable
Go to step 11 Replace the
"System board"
on page 4-67
Replace the Go to
"Operator panel" on
panel" on page 4-49
page 4-49 replace the
operator panel
cable
Go to step 13 Call your next
level support
Replace the Go to step 14
"Operator
panel" on
page 4-49
Replace the Go to
"Operator panel" on
panel" on page 4-49
page 4-49 replace the
operator panel
cable
Diagnostic information
5060-2XX
"Operator
and
"Operator
and
"Operator
and
2-123