Notes on the Main Power Switch (SW1)
SM 4-1 D0CA/D0C9/D0C8/D0CB
&
Adjustment
4. REPLACEMENT AND ADJUSTMENT
4.1 NOTES ON THE MAIN POWER SWITCH (SW1)
4.1.1 PUSH SWITCH
The main power button of this machine has been changed to a push-button switch from the
conventional rocker switch. The push switch has characteristics and specifications different
from the rocker switch. Care must be taken when replacing and adjusting parts.
Characteristics of the Push Switch (Main Power Switch (SW1))
The push switch in this machine uses DC (direct current). Therefore, if
the AC power cord is connected to an electrical outlet, power is supplied
to the controller board (PCB24), the operation unit and other modules
even when the main power is turned OF F. When replacing the controller
board (PCB24) and the operation unit in this state, not only these boards,
but other electrical components will be damaged.
So, when performing maintenance work such as replacing parts, in addition to turning OFF the
main power with the push switch, always unplug the AC power cord after the LED on the
operation panel is turned OFF and press the push switch to discharge any residual voltage, see
information below.
• If you unplug the power cord before turning off the LED, some icons on the operation
panel will not appear at the next start-up. Restarting the machine again will solve this
issue.
When you disconnect the power cord from the AC wall outlet, there is still
residual charge inside the machine for a while. Therefore, if you remove
boards in this state, it can cause a blown fuse or memory failure.
• How to remove the residual charge inside the machine
After you unplug the power cord from the AC wall outlet, in order to remove the residual
charge from inside the machine, press the main power switch (SW1). The charge
remaining in the machine is released, and it is possible to remove boards.
In order to remove the residual charge, push the main power switch
(SW1) after you disconnect the AC power cord. At that time, the power ON
flag inside the machine is set. Therefore, after you finish work on the
machine and reconnect the power cord to the AC, even if you do not press
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