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e-STUDIO350/352/353/450/452/453
LASER OPTICAL UNIT
© 2003 - 2008 TOSHIBA TEC CORPORATION All rights reserved
8.4 Laser Optical Unit Cooling Fan
The laser optical unit cooling fan is a propeller fan (80 x 80 mm). It cools down the polygonal motor
and the drive PC board.
8.5 Polygonal Motor
(1) Drive circuit of the polygonal motor
(2) Control signal
The polygonal motor is a DC motor which is PLL-controlled by clock signals. The signals from
LGC board control the polygonal motor.
Signal
POMON
POMCK
POMP
Fig. 8-501
Remarks
Polygonal motor ON signal
Polygonal motor reference clock signal
Polygonal motor PLL signal
Level “L”
ON
—
Normal rotation
Level “H”
OFF
—
Abnormal rotation
IC24
CPU
LGC board POL board
Buffer
P86/T0A
P92/T12
P93/T03
IC8
POMCK
POMPL
POMON
05/11