e-STUDIO167/207/237 © 2007 - 2008 TOSHIBA TEC CORPORATION All rights reserved
LASER OPTICAL UNIT
8 - 6
8.4 Polygonal Motor Control Circuit
The polygonal motor is a DC motor rotated by a clock signal (PMTRCLK) output from the SoC. This
motor is controlled under PLL (Phase Locked Loop) to realize an accurate and constant rotation. Its
rotation status is converted to a status signal (PMTRSTS-0) and then output to the ASIC. PMTRSTS-0
signal moves to a low level only when the rotation status of the motor is constant. The SoC detects the
rotation status with this signal, and emits a laser beam only when the rotation status is constant.
Fig. 8-9
Signal Function Low level High level
PMTR-0 Polygonal motor ON signal ON OFF
PMTRCLK Polygonal motor reference clock - -
PMTRSTS-0 Polygonal motor PLL control signal Rotating at a constant
speed
Stopping or error
IC23
ASIC
IC53
SoC
PMTR-0
PMTRSTS-0
PMTRCLK
PMTRCLKB
PMTR-0A
Polygonal motor
+5V
+24V
PG
IC24
IC15
MAIN board
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