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March 2005 © TOSHIBA TEC e-STUDIO520/600/720/850 LASER OPTICAL UNIT
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8.5 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.8-11
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
H L
L H Low speed
H H Stopping
IC56
ASIC
LDFOF-1
LDFAN-0
+24VA+24VA
DG
IC2
Laser unit
cooling fan
LGC board
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