Laser Optical Unit Cooling Fan; Polygonal Motor - Toshiba e-STUDIO453 Service Manual

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
8
(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
e-STUDIO350/352/353/450/452/453
LASER OPTICAL UNIT
P93/T03
P86/T0A
IC24
CPU
P92/T12
LGC board
Fig. 8-501
Level "L"
ON
—
Normal rotation Abnormal rotation
IC8
POL board
Level "H"
OFF Polygonal motor ON signal
— Polygonal motor reference clock signal
Polygonal motor PLL signal
8 - 8 © 2003 - 2008 TOSHIBA TEC CORPORATION All rights reserved
05/11
POMON
POMCK
POMPL
Remarks