Ricoh Gim-MF1a, Field Service Manual

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4. Replacement and Adjustment
General Cautions
Notes on the Main Power Switch
The main power button of this machine has been changed to a push-button switch (push button) 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 and other modules even
when the main power is turned OFF. When replacing the controller board in this state, not only this
board, 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.
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, inside the machine for a while there
is still residual charge. 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, be sure to press the main power switch. Thus, the charge remaining in the machine is
released, and it is possible to remove boards.
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