Lexmark C782 Service Manual - Page 131

System board on Operator panel, assembly, removal on, System, board removal

Page 131 highlights

5061 Step 7 Actions and questions System board-Measure the voltage at connector JOPP1-2 on the "System board" on page 5-8. The voltage measures approximately +5 V dc. Is the voltage correct? 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 JOPP1-4 on the operator panel board connector can cause this symptom. Check for continuity between pin JOPP1-4 and ground on the board. Go to "System board" on page 5-8. 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 five beeps? 13 Voltage checks at system board connector JOPP1- Go to "System board" on page 5-8. Check the voltages on connector JOPP1 as shown: Connector Voltage (display Voltage (display active-LCD pin static) Test running) JOPP1-1 +5 V dc Voltage varies 1.0 to 2.0 V dc JOPP1-2 +5 V dc +5 V dc JOPP1-3 +5 V dc Voltage varies 1.0 to 2.4 V dc JOPP1-4 Ground Ground JOPP1-5 +5 V dc +5 V dc Are the voltages correct? 14 Operator panel cable-Check continuity of the operator panel cable. Is there continuity? Yes Replace the operator panel assembly. See "Operator panel assembly removal" on page 4-68. Go to step 9 Replace the system board. See "System board removal" on page 4-89. Go to step 11 Replace the operator panel assembly. See "Operator panel assembly removal" on page 4-68. Go to step 13 Replace the operator panel assembly. See "Operator panel assembly removal" on page 4-68. Replace the operator panel assembly. See "Operator panel assembly removal" on page 4-68. No Go to step 8 Seat the cable correctly. Go to "Operator panel assembly removal" on page 4-68, and replace the operator panel cable. Replace the system board. See "System board removal" on page 4-89. Go to "Operator panel assembly removal" on page 4-68 and replace the operator panel cable. Contact your next level of support. Go to step 14 Go to "Operator panel assembly removal" on page 4-68, and replace the operator panel cable. Diagnostic information 2-89

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Diagnostic information
2-89
5061
7
System board—Measure the voltage at connector
JOPP1-2 on the
“System board” on page 5-8
. The
voltage measures approximately +5 V dc.
Is the voltage correct?
Replace the
operator panel
assembly. See
“Operator panel
assembly
removal” on
page 4-68
.
Go to step 8
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.
See
“System
board removal”
on page 4-89
.
Go to
“Operator
panel assembly
removal” on
page 4-68
, and
replace the
operator panel
cable.
10
System board—A poor ground connection between
pin JOPP1-4 on the operator panel board connector
can cause this symptom. Check for continuity between
pin JOPP1-4 and ground on the board. Go to
“System
board” on page 5-8
.
Is there continuity?
Go to step 11
Replace the
system board.
See
“System
board removal”
on page 4-89
.
11
Operator panel cable—Check continuity of the
operator panel cable.
Is there continuity?
Replace the
operator panel
assembly. See
“Operator panel
assembly
removal” on
page 4-68
.
Go to
“Operator
panel assembly
removal” on
page 4-68
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 five beeps?
Go to step 13
Contact your next
level of support.
13
Voltage checks at system board connector JOPP1—
Go to
“System board” on page 5-8
. Check the
voltages on connector JOPP1 as shown:
Are the voltages correct?
Replace the
operator panel
assembly. See
“Operator panel
assembly
removal” on
page 4-68
.
Go to step 14
14
Operator panel cable—Check continuity of the
operator panel cable.
Is there continuity?
Replace the
operator panel
assembly. See
“Operator panel
assembly
removal” on
page 4-68
.
Go to
“Operator
panel assembly
removal” on
page 4-68
, and
replace the
operator panel
cable.
Step
Actions and questions
Yes
No
Connector
pin
Voltage (display
static)
Voltage (display active—LCD
Test running)
JOPP1-1
+5 V dc
Voltage varies 1.0 to 2.0 V dc
JOPP1-2
+5 V dc
+5 V dc
JOPP1-3
+5 V dc
Voltage varies 1.0 to 2.4 V dc
JOPP1-4
Ground
Ground
JOPP1-5
+5 V dc
+5 V dc