Replacement And Adjustment; Notes On The Main Power Switch; Push Switch - Ricoh MP C307 Field Service Manual

Notes on the Main Power Switch

4. Replacement and Adjustment

Notes on the Main Power Switch

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 (DC Switch)
Power is supplied to the machine even when the main power switch is turned OFF.
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, the operation unit and other modules even when the
main power is turned OFF. When replacing the controller board and the operation unit in this state, not only
these boards, it will damage other electrical components.
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.
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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, inside the machine there is still
residual charge.
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.
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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. The charge remaining in the machine is released, and it is
possible to remove boards.
When you reconnect the AC power cord into an AC wall outlet, the machine will start automatically.
In order to remove the residual charge, push the main power switch 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 the main power switch, the machine will start
automatically and the moving parts will begin to move. When working on moving parts, be careful that fingers
or clothes do not get caught.
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Automatic restart deals with cases when you accidentally unplugged the AC power cord or
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