e-STUDIO350/450 LASER OPTICAL UNIT 8 - 8 November 2003 © TOSHIBA TEC
8
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
LGC board
POL board
P93/T03
P86/T0A
P92/T12
POMON
POMCK
POMPL
IC24
CPC
IC8
Buffer
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