HP LaserJet Enterprise M607n - Low-voltage power supply voltages description; Over-current;over-voltage protection; Safety

Low-voltage power supply voltages description
The low-voltage power supply converts the AC power into two DC voltages, which it then subdivides, as
described in the following table:
Table 1-10 Converted DC voltages
Main DC voltage Sub-voltage Behavior
+24V +24VA0 Stopped during active OFF or inactive OFF
+24VA2 Stopped during active OFF or inactive OFF
+24VB Stopped during active OFF or inactive OFF
+24VC1 Stopped during active OFF or inactive OFF
+24VC2 Stopped during active OFF or inactive OFF
+24VF Stopped during active OFF or inactive OFF
+5V +5VA Stopped during inactive OFF
+5VB Stopped during active OFF or inactive OFF
+5VE Stopped during inactive OFF
+5LL Stopped during active OFF or inactive OFF
+3.3V +3.3VA Stopped during inactive OFF
+3.3VB2 Stopped during inactive OFF
Supplied intermittently during active OFF
+3.3VC Stopped during active OFF or inactive OFF
=3.3VF 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 noties 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.
Safety
For personal safety, the printer interrupts +24VB and +24VC power when the cartridge door detection switch
is turned o. This stops DC power supply to the High-voltage power supply (HVPS)
12 Chapter 1 Theory of operation ENWW