Toshiba 3511, 4511 Laser Unit Cooling Fan, Polygonal Motor, Drive circuit of the polygonal motor

8.4 Laser Unit Cooling Fan

The laser unit cooling fan is a propeller fan (80 x 80 mm). It cools down the polygonal motor and the Laser driving PC board.

8

8.5 Polygonal Motor

(1) Drive circuit of the polygonal motor

PD4
DCCLK4	(IC7407)
Gate array
	Buffer
LCA301-1
PI1
PWA-F-LGC
	Fig. 8-501

POMON

POMCK

POMPL

M/DC-POL

(2)Control signal

The polygonal motor is a DC motor which is PLL-controlled by clock signal. The signals from LGC board controls the polygonal motor.

Signal	Level “L”	Level “H”	Remarks
POMON	ON	OFF	Polygonal motor ON/OFF signal
POMCK	—	—	Polygonal motor reference clock signal
POMPL	Normal rotation	Abnormal rotation	Polygonal motor PLL signal

e-STUDIO3511/4511 LASER OPTICAL UNIT 8 - 8 November 2003 © TOSHIBA TEC