Toshiba 353 User Manual
8 - 8
8
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.
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.
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
Polygonal motor reference clock signal
Polygonal motor PLL signal
Level “L”
ON
—
Normal rotation
Level “H”
OFF
—
Abnormal rotation
IC24
CPU
CPU
LGC board
POL board
Buff
er
P86/T0A
P92/T12
P93/T03
IC8
POMCK
POMPL
POMON
05/11