• Code: 4501-111.55
• Description: Laser malfunction
  Closed-loop printhead error while waiting for amp Kp to converge.
• Causes: • Printhead (PH) • Controller board (CTLB)
• Remedy: 1 Check PH cables JLSU1 and J6 for proper connection. Reseat the cables if any abnormality is found. 2 Inspect PH cables and connectors. 3 Replace CTLB. 4 Replace PH.

• Code: 4501-111.56
• Description: Laser malfunction
  Closed-loop printhead error, amp Ki failed to converge.
• Causes: • Printhead (PH) • Controller board (CTLB)
• Remedy: 1 Check PH cables JLSU1 and J6 for proper connection. Reseat the cables if any abnormality is found. 2 Inspect PH cables and connectors. 3 Replace CTLB. 4 Replace PH.

• Code: 4501-111.57
• Description: Laser malfunction
  Closed-loop printhead error while waiting for amp Ki to converge.
• Causes: • Printhead (PH) • Controller board (CTLB)
• Remedy: 1 Check PH cables JLSU1 and J6 for proper connection. Reseat the cables if any abnormality is found. 2 Inspect PH cables and connectors. 3 Replace CTLB. 4 Replace PH.

• Code: 4501-111.58
• Description: Laser malfunction
  Closed-loop printhead error, load scan regs state.
• Causes: • Printhead (PH) • Controller board (CTLB)
• Remedy: 1 Check PH cables JLSU1 and J6 for proper connection. Reseat the cables if any abnormality is found. 2 Inspect PH cables and connectors. 3 Replace CTLB. 4 Replace PH.

• Code: 4501-111.59
• Description: Laser malfunction
  Closed-loop printhead error, forward and reverse capture times differ by too much.
• Causes: • Printhead (PH) • Controller board (CTLB)
• Remedy: 1 Check PH cables JLSU1 and J6 for proper connection. Reseat the cables if any abnormality is found. 2 Inspect PH cables and connectors. 3 Replace CTLB. 4 Replace PH.

• Code: 4501-111.60
• Description: Laser malfunction
  Closed-loop printhead sweep error, check sweep accuracy state.
• Causes: • Printhead (PH) • Controller board (CTLB)
• Remedy: 1 Check PH cables JLSU1 and J6 for proper connection. Reseat the cables if any abnormality is found. 2 Inspect PH cables and connectors. 3 Replace CTLB. 4 Replace PH.

• Code: 4501-111.61
• Description: Laser malfunction
  Printhead drive control out of range due to an external event beyond what the control is designed to handle.
• Causes: • Printhead (PH) • Controller board (CTLB)
• Remedy: 1 Check PH cables JLSU1 and J6 for proper connection. Reseat the cables if any abnormality is found. 2 Inspect PH cables and connectors. 3 Replace CTLB. 4 Replace PH.

• Code: 4501-111.62
• Description: Laser malfunction
  Closed-loop printhead error, off-resonant PI effort state.
• Causes: • Printhead (PH) • Controller board (CTLB)
• Remedy: 1 Check PH cables JLSU1 and J6 for proper connection. Reseat the cables if any abnormality is found. 2 Inspect PH cables and connectors. 3 Replace CTLB. 4 Replace PH.