![](/images/new-backgrounds/1223199/223199125x1.webp)
CHAPTER 2
F. Other Controls
1. Main motor control
Figure below shows the main motor control circuit.
DC controller PCB
CPU | +24VB |
| |
IC201 | +5V |
| |
P62 | 38 |
| |
| +5V |
P63 | 39 |
/MMRDY |
Main motor
MT1
M
Figure
The main motor is a DC brushless motor with hall elements, and is unified with the motor drive circuit.
The CPU (IC201) sets the MAIN MOTOR DRIVE signal (/MMOTD) to “L” and rotates the main motor.
When the main motor rotates and reaches its specified speed, it sets the MAIN MOTOR READY signal (/MMRDY) to “L.”
The CPU notifies the video controller PCB of a main motor failure in the following cases:
1)The /MMRDY signal does not become “L” withing 2.5 seconds after from the main motor rotation starts.
2)The /MMRDY signal becomes “L” once, but becomes “H” for more than 0.1 seconds contin- uously during the specified speed rotation.
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