External And Controls; Power Supply; Protection Function; Backup Battery - Canon L120 Series Service Manual

Chapter 2

2.6 External and Controls

2.6.1 Power Supply

2.6.1.1 Protection Function

2.6.1.1.1 Protective Mechanisms

FAX-L100 / FAX-L120
The protective mechanisms include an overcurrent protective circuit that uses a fuse. If short circuit or the like occurs because of some fault and, as a result,
an overcurrent flows, the fuses will melt to cut off the power to the power supply circuit.
The power supply circuit is equipped with 2 fuses (FU1, FU2); in the event an overcurrent flows into the AC line, either of these fuses will melt to cut out
the current.

2.6.1.2 Backup Battery

2.6.1.2.1 Battery-backed up Data

FAX-L100 / FAX-L120
The machine is equipped with a battery used to back up the clock IC.
The lithium battery (BT1) on the SCNT starts to supply power to the clock IC when the jumper pin (CJ2) is shorted by a jumper plug.
The machine does not have a mechanism to back up image data. As such, loss of power (e.g., power outage or disconnected power cord) will lead to loss
of images.
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