Lexmark C760 - Page 162

2-126 Service Manual
5060-4xx
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?
Go to step 9 Seat the cable
correctly
9
Operator panel cable - Check continuity of the operator
panel cable.
Is there continuity?
Replace the
“System board”
on page 4-72
Go to “Operator
panel” on
page 4-53 and
replace the
operator panel
cable
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 “System
board” on page 5-8.
Is there continuity?
Go to step 11 Replace the
“System board”
on page 4-72
11
Operator panel cable - Check continuity of the operator
panel cable.
Is there continuity?
Replace the
“Operator
panel” on
page 4-53
Go to “Operator
panel” on
page 4-53 and
replace the
operator panel
cable
12
Operator panel assembly - Does the operator panel
display all diamonds, with the power on/status LED on
and 5 beeps?
Go to step 13 Call your next
level support
13
Voltage checks at system board connector J6 - Go to
“System board” on page 5-8. Check the voltages on
connector J6 as shown:
Are the voltages correct?
Replace the
“Operator
panel” on
page 4-53
Go to step 14
14
Operator panel cable - Check continuity of the operator
panel cable.
Is there continuity?
Replace the
“Operator
panel” on
page 4-53
Go to “Operator
panel” on
page 4-53 and
replace the
operator panel
cable
Step Action and questions Yes No
Connector
pin
Voltage (display
static)
Voltage (display active - LCD
Test running)
J6-1 +5 V dc Voltage varies 1.0 to 2.0 V dc
J6-2 +5 V dc +5 V dc
J6-3 +5 V dc Voltage varies 1.0 to 2.4 V dc
J6-4 Ground Ground
J6-5 +5 V dc +5 V dc