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FAX-L350 Chapter 1: General Description
5.5 Protective Mechanism
5.5.1 Data battery backup function
If there is a power outage or if the power is turned off, the data stored in the control memory is retained since
the lithium battery function as a data battery backup.
For details on the backed up data,
see Chapter 1: 5.4 Data-related precautions on
Page 1-36.
5.5.2 Overcurrent protection
This machine is provided with an overcurrent with built-in fuse, to prevent abnormal rises in temperature if
an overcurrent flows to the motors and power supply due to driver IC trouble, software lockup and short
circuit.
Protected Parts
Safety Measures
Document feed motor
IC protector (FU501) on SCNT board
Main motor
IC protector (FU501) on SCNT board
Power supply unit
Glass-tube current fuse (FU101:250V, 3.15A)
overcurrent protection circuit
thermistor (TH101)
Fixing ass’y
Thermal fuse, thermistor
5.5.3 Lightning protection
The fax unit’s electrical components are protected from abnormal voltage caused by lightning.
Protected Component
Safety Device
NCU board ass’y
Arrester (AR1, AR2) located at the primary side of the NCU board
discharge a voltage of more than 500VDC via the power cord.
Power supply unit
Varistor (VZ101, VZ102*) and arrester (AR101)* located at the primary
side of the power supply unit discharge a voltage of more than
* For VZ102 and AR101, only the AE version exits.
When protection is not possible
The NCU board sometimes may not be protected even by the protection circuits if lightning
strikes the telephone line.
5.5.4 Power leakage protection
The AC line, telephone line, and metal parts of the fax unit are completely insulated. The fax unit has a
grounded power cord to prevent electrical shock. If power leakage does occur, use the fax unit only with a
grounded electrical outlet supplying the proper voltage.
REFERENCE
NOTE
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