HP CM3530 Service Manual - Page 156

Table 5-8 Converted DC voltages (continued) Main DC voltage Sub-voltage +24VB +5 V +3.3 V +5VA +5VC 3.3V 3.3VS Behavior Interrupted when the front door or right door open Stopped during Sleep (powersave) mode Constantly supplied Interrupted when the front door or right door open Constantly supplied 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. 126 Chapter 5 Theory of operation ENWW