Table 1-4 Low-voltage power supply specifications
DC voltage Behavior
+24v
+24VA Constantly supplied
Stopped during Sleep mode
+24VB Interrupted when the top door opens
+12V +12U Constantly supplied
+5V +5V Constantly supplied
+3.3V
+3.3V Constantly supplied
+3.3R Constantly supplied
Stopped during Sleep mode
Overcurrent/overvoltage protection
The low-voltage power supply automatically stops supplying the DC voltage to the product components
whenever it detects excessive current or abnormal voltage.
The low-voltage power supply has a protective circuit against overcurrent and overvoltage to prevent
failures in the power supply circuit
If DC voltage is not being supplied from the low-voltage power supply, the protective function might be
running. In this case, turn off the power switch and unplug the power cord. Do not turn on the product
switch until the root cause is found and corrected.
The DC controller determines a low-voltage power supply failure and notifies the formatter when the
protective function for the +24V power supply runs.
In addition, the low-voltage power supply has two fuses (FU1 and FU2) to protect against overcurrent. If
overcurrent flows into the AC line, the fuse blows to stop AC power.
Safety
For safety the product interrupts the power supply of +24 V by turning off the interlock switch.
See
Table 1-4 Low-voltage power supply specifications on page 17. Accordingly, the DC power to the
following components is interrupted:
●
High-voltage power supply
●
Low-voltage power supply
●
Laser scanner fan (FN102)
●
Cartridge front side fan (FN103)
●
Switchback fan (FN105)
●
Cartridge fan (FN301)
ENWW
Engine-control system
17
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