Toshiba E-STUDIO900 - Manual (Page 58)

PTM 2-33 B070/B071
2.4.4 MULTI-BEAM LINE EXPOSURE
The LD unit contains two laser diode arrays (LDA) [A], each with one 4-channel array,
allowing the LD unit to produce a total of eight beams. This multi-beam exposure
mechanism has the following advantages:
• Reduces the number of rotations required of the polygon mirror motor.
• Reduces the amount of noise generated by the polygon mirror motor because it is
rotating at lower speed.
• Reduces the need for LD unit replacement.
• Allows production of a more precision beam on a stable platform.
The laser synchronization detector detects only Channel 0 and Channel 1, the
uppermost beams of each parallel array.
The main scan pitch of Channels 2 to 7 is determined by setting SP2115 001~006
(Main Scan Beam Pitch Adjustment) at the factory. For this reason, when the LD unit
is replaced, these SP codes must be input for the new unit. The correct SP settings
are printed on a label attached to the LD unit.
An SC code is issued for a laser synchronization detector error if the LD unit
malfunctions and does not emit the laser beams.
B070D212.WMF [A]