Ricoh B132 Service Manual page 431

SC224 D Laser Synchronization Detector Error 1: M Leading Edge: LD0
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.
SC225 D Laser Synchronization Detector Error 2: M Leading Edge (Other than LD0)
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.
SC226 D Laser Synchronization Detector Error 1: C Leading Edge: LD0
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.
SC227 D Laser Synchronization Detector Error 2: C Leading Edge (Other than LD0)
While the polygon motor is
rotating normally, no
synchronizing detection signal is
output for cyan, leading edge for
any LD other than LD0, even
after the laser diode has been
firing for 2 sec.
SM
SERVICE CALL CONDITIONS
• Harness between the laser synchronizing
detector and I/F unit is disconnected,
defective
• Laser synchronizing detector defective
• GAVD on the BICU defective
• LD driver board defective
• LDB defective
• BCU defective
• Check board connections, replace
• GAVD on the BICU defective
• LD driver defective
• LDB defective
• BCU defective
• Check board connections, replace
• Harness between the laser synchronizing
detector and I/F unit is disconnected,
defective
• Laser synchronizing detector defective
• GAVD on the BICU defective
• LD driver board defective
• LDB defective
• BCU defective
• Check board connections, replace
• Beam not reflected in photo detection
• GAVD on the BICU defective
• LD driver defective
• LDB defective
• BCU defective
• Check board connections, replace
4-31 B132/B200