2.4.4 LSU
The LSU consists of LD(Laser Diode) and polygon motor control. The LSU is controlled by 4 LD’s in order to
better reproduce a full Color Image. When the controller generates the printing signal, LD will turn on and
Polygon motor starts.If the receiving part in LSU detects the beam, Hsync is generated. When the rotation
of polygon motor is properly synchronized, the LSU is ready for printing. If either of two condition are not
satised, an LSU error is thrown by the copier engine.
Trouble Failure Analysis
Hsync Error If the rotation of polygon motor is not properly synchronized, the signal for
the Hsync is not generated.
Polygon Motor Error The rotation of polygon motor is not stable.
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