Low-voltage power supply voltages description
The low-voltage power supply converts the AC power into three DC voltages, which it then subdivides, as
described in the following table.
Table 1-8 Converted DC voltages
Main DC voltage Sub-voltage Behavior
+24 V +24 VA Constantly supplied
Stopped during active OFF or inactive OFF
+24 VB Interrupted when the right door is open (SW1)
+24 VC Interrupted when the right door is open (SW1)
+5 V +5 VA Constantly supplied
+5 VB Constantly supplied
+5 VC Constantly supplied
Stopped during active OFF or inactive OFF
+3.3 V +3.3 VA Constantly supplied
+3.3 VB Constantly supplied
Stopped during inactive OFF
+3.3 VC Constantly supplied
Stopped during active OFF or inactive OFF
+3.3 VD Constantly supplied
Stopped during active OFF or inactive OFF
Over-current/over-voltage protection
The low-voltage power supply automatically stops supplying the DC voltage to the printer components
whenever it detects excessive current or abnormal voltage. The low-voltage power supply has a protective
circuit against over-current and over-voltage to prevent failures in the power supply circuit.
CAUTION: If DC voltage is not being supplied from the low-voltage power supply, the protective function
might be running. In this case, turn the power switch o and unplug the power cord.
Do not turn the power switch on until the root cause is found and corrected.
If the protective function is active, the DC controller noties the formatter of a low-voltage power supply
failure. In addition, the low-voltage power supply has two fuses to protect against over-current. If over-
current ows into the AC line, the fuse stops the AC power.
Sleep mode operation
Sleep mode conserves energy by stopping the power to several components when the printer is idle. If the DC
controller detects voltage that is too high when the printer is in Sleep mode, it determines that the low-
voltage power supply has failed, and it noties the formatter.
ENWW Engine-control system 19
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