Lexmark C782 Service Manual - Page 131
System board on Operator panel, assembly, removal on, System, board removal
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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