Samsung CLP-770ND - Laser Scanning Unit (LSU) Operation

Product spec and feature
Service Manual
2-27
Samsung Electronics
OPC Drum
Photo Diode
LD Driver circit
Protector panel
LD(Laser Diode)
Polygon Mirror
Polygon Motor
Motor Driver
2.4.8 LSU ( Laser scanning unit )
LSU consists of LD(Laser Diode) and polygon motor control. For realizing Color Image, it is controled by
4 LD. When the controller generate the printing signal, LD will turn on and Polygon motor starts.If the
receiving part in LSU detect the beam , Hsync is generated. When the rotation of polygon motor is steady,
it is time of LSU ready status for printing. If either of two condition is not satised, LSU error is expected.
Trouble Failure Analysis
Polygon Motor Error The Rotation of Polygon Motor can not reach stable
Hsync Error Though the rotation of Polygon Motor reach stable, the signal of Hsync is
not occurred