Ricoh SH-P1 M020 Field Service Manual page 249

Laser synchronization detection error:
LD0
The laser synchronizing detection
220 D
signal for the start position of the LD is
not output within 500 ms after the LDB
unit turns on with the polygon motor
rotating normally.
Laser synchronization detection error:
except LD0
The laser synchronizing detection
221 D
signal for the start position of the other
LDs are not output within 500 ms after
LDB unit turns on with the polygon
motor rotating normally.
FGATE ON error
The FGATE signal did not assert within
1 second. (The BCU generates the
230 D
FGATE signal and sends it to the LD
unit when the registration sensor
switches on.)
• Disconnected cable from the laser
synchronizing detection unit or defective
connection
• Defective laser synchronizing detector
• Laser beam does not go into the photo
detector
• Defective GAVD
• Defective LD Driver
• Defective LDB
• Defective BCU
• Turn the Power Switch Off and On.
• Laser beam does not go into the photo
detector
• Defective GAVD
• Defective LD Driver
• Defective LDB
• Defective BCU
• Turn the Power Switch Off and On.
• Defective GAVD and PCI bridge ASIC
• Defective BCU
• Defective controller board
• Defective harness between BCU and LDB
• Turn the Power Switch Off and On.
• Connect the harness properly.
• Replace the harness.
• Replace LD unit.
• Replace the controller board.
Service Call Conditions
6
247