SERVICE CALL CONDITIONS April 2007 4-32
Laser Synchronization Detector Error 1: M Leading Edge: LD0 SC224 D
While the polygon motor is
rotating normally, no
synchronizing detection signal is
output for LD0 magenta, leading
edge, even after the laser diode
has been firing for 2 sec.
• Harness between the laser synchronizing
detector and I/F unit is disconnected,
defective
• Laser synchronizing detector defective
• Beam not reflected in photo detection
• GAVD (ASIC) on the BICU defective
• LD driver board defective
• LDB defective
• BICU defective
• Check board connections, replace
Laser Synchronization Detector Error 2: M Leading Edge (Other than LD0) SC225 D
While the polygon motor is
rotating normally, no
synchronizing detection signal is
output for magenta, leading
edge for any LD other than LD0,
even after the laser diode has
been firing for 2 sec.
• Beam not reflected in photo detection
• GAVD (ASIC) on the BICU defective
• LD driver defective
• LDB defective
• BICU defective
• Check board connections, replace
Laser Synchronization Detector Error 1: C Leading Edge: LD0 SC226 D
While the polygon motor is
rotating normally, no
synchronizing detection signal is
output for LD0 cyan, leading
edge, even after the laser diode
has been firing for 2 sec.
• Harness between the laser synchronizing
detector and I/F unit is disconnected,
defective
• Laser synchronizing detector defective
• Beam not reflected in photo detection
• GAVD (ASIC) on the BICU defective
• LD driver board defective
• LDB defective
• BICU defective
• Check board connections, replace
Laser Synchronization Detector Error 2: C Leading Edge (Other than LD0) SC227 D
While the polygon motor is
rotating normally, no
synchronizing detection signal is
output for cyan, leading edgefor
any LD other than LD0, even
after the laser diode has been
firing for 2 sec.
• Beam not reflected in photo detection
• GAVD (ASIC) on the BICU defective
• LD driver defective
• LDB defective
• BICU defective
• Check board connections, replace