April, 2007 SERVICE CALL CONDITIONS
4-31
Laser Synchronization Detector Error 1: K Leading Edge: LD0 SC220 D
While the polygon motor is
rotating normally, no
synchronizing detection signal is
output for LD0 black, or 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 is defective
• LD driver board defective
• LDB defective
• BICU defective
• Check board connections, replace
Laser Synchronization Detector Error 2: K Leading Edge (Other than LD0) SC221 D
While the polygon motor is
rotating normally, no
synchronizing detection signal is
output for black, 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) (ASIC) on the BICU
defective
• LD driver defective
• LDB defective
• BICU defective
• Check board connections, replace
Laser Synchronization Detector Error 1: Y Leading Edge: LD0 SC222 D
While the polygon motor is
rotating normally, no
synchronizing detection signal is
output for LD0 yellow, 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) (ASIC) on the BICU
defective
• LD driver board defective
• LDB defective
• BICU defective
• Check board connections, replace
Laser Synchronization Detector Error 2: Y Leading Edge (Other than LD0) SC223 D
While the polygon motor is
rotating normally, no
synchronizing detection signal is
output for yellow, 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) (ASIC) on the BICU
defective
• LD driver defective
• LDB defective
• BICU defective
• Check board connections, replace
