7
© 2009 - 2011 TOSHIBA TEC CORPORATION All rights reserved e-STUDIO555/655/755/855
LASER OPTICAL UNIT
7 - 11
7.5 Laser Unit Cooling Fan Control Circuit
The laser unit cooling fan is a DC fan motor which sends air to the laser unit heated by the polygonal
motor to cool down the unit. This fan is controlled to switch its rotation among three; high speed, low
speed and stopping, according to the condition of the equipment.
Fig. 7-12
Relation between each signal level and the rotation of the fan
(L = Low level, H = High level)
Signal Function
LDFAN-0 Laser unit cooling fan high-speed rotation signal
LDFOF-1 Laser unit cooling fan low-speed rotation signal
LDFOF-1 LDFAN-0 Rotation of Fan
L L High speed
HL
L H Low speed
H H Stopping
IC56
ASIC
LDFOF-1
LDFAN-0
+24VD2+24VD2
DG
IC2
Laser unit
cooling fan
LGC board