Main DC voltage Sub-voltage Behavior
+24VB Interrupted when the front door or right
door open
Stopped during Sleep (powersave)
mode
+5 V +5VA Constantly supplied
+5VC Interrupted when the front door or right
door open
+3.3 V 3.3V Constantly supplied
3.3VS Stopped during Sleep (powersave)
mode
Overcurrent/overvoltage protection
The low-voltage power supply stops supplying the DC voltage to the product components whenever it
detects excessive current or abnormal voltage from the power source.
Safety
For personal safety, the low-voltage power supply interrupts power to the fuser, the high-voltage power
supply, and the motors when the front door or right door open.
Voltage detection
The printer detects the power supply voltage that is connected to the printer. The DC controller monitors
the input voltage from the power source so it can control the voltage to the fuser.
Sleep (powersave) mode
Sleep mode conserves energy by stopping the power to several components when the product is idle.
If the DC controller detects voltage that is too high when the product is in Sleep mode, it determines
that the low-voltage power supply has failed, and it notifies the formatter.
Low-voltage power supply failure
The DC controller determines a low-voltage power supply failure and notifies the formatter when the
low-voltage power supply does not supply +24 V.
Table 5-8 Converted DC voltages (continued)
126 Chapter 5 Theory of operation ENWW
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