Polygonal Motor Control Circuit - Toshiba e-STUDIO167 Service Manual

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.
MAIN board
IC53
SoC
IC23
ASIC
Signal
PMTR-0 Polygonal motor ON signal
PMTRCLK Polygonal motor reference clock
PMTRSTS-0 Polygonal motor PLL control signal
e-STUDIO167/207/237
LASER OPTICAL UNIT
IC24
PMTRCLK
PMTR-0
+5V
PMTRSTS-0
Function
+24V
PG
IC15
PMTRCLKB
PMTR-0A
Fig. 8-9
Low level
ON
-
Rotating at a constant
speed
© February 2007 TOSHIBA TEC CORPORATION All rights reserved
8 - 6
Polygonal motor
High level
OFF
-
Stopping or error