Canon NP6512 Service Manual page 40

CHAPTER 2 BASIC OPERATION
2. Operations
The main motor (M1) is a DC motor with a built-in clock pulse generator, which generates
clock pulses (MMCLK) in relation to the rotation of the motor while the motor is rotating.
The speed control circuit controls the main motor (M1) so that it rotates at a specific speed by
matching the frequency of these clock pulses and that of the reference signals.
When the main motor drive signal (MMD) from the DC controller circuit goes '1', the motor
diver drive circuit turns on, causing the main motor (M1) to rotate at a specific speed.
While the main motor is rotating at a specific speed, the main motor driver PCB keeps sending
the constant speed state signal (MLOCK=0) to the DC controller PCB. If the rotation of the motor
starts to have fluctuations, the MLOCK signal goes '1'.
Related Error Code
E010
While the main motor drive signal is generated, the rotation of the main motor deviates from
a specific number for 1 sec or more.
a. Turning On/Off the Main Motor
When the main motor drive signal (MMD) from the DC controller circuit goes '1', the main
motor driver turns on to rotate the main motor (M1).
b. Rotating the Main Motor at a Constant Speed
The drive circuit on the motor driver PCB controls the main motor so that the phase of the
frequency of the clock pulse signals (MMCLK) occurring when the motor rotates and that of
the frequency of the reference signals match. The main motor driver PCB sends the constant
speed state signal (MLOCK=0) to the DC controller circuit.
c. Detecting an Error (E010)
If the rotation of the main motor starts to have fluctuations for some reason, the MLOCK
signal goes '1'. If the signal remains '1' for about 1 sec, the DC controller will find the
condition to be a fault in the main motor, and will stop the main motor and, at the same time,
indicate 'E010' in the display.
2-6
COPYRIGHT © 1999 CANON INC. CANON NP6512/6612/7120/7130/7130F REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)