HP Color LaserJet CM2320 Service Manual - Page 99
Power supply, Protective function,
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Power supply The power supply converts AC power from the power receptacle into DC power to cover the DC loads, and it controls the fuser heater temperature. Figure 5-5 Power supply AC input Fuse FU2901 Fuse FU2801 Noise filter Noise filter Protection circuit Fuser power supply Fuser control circuit Zero crossing circuit ZEROX +3.3V generation circuit Power switch control circuit +3.3V DC controller Power switch SW3001 PSREM24V Rectifying circuit +24V generation circuit Low-voltage power supply Power supply unit +24V Protective function The power supply unit has a protective function against overcurrent and overvoltage to prevent failures in the power supply circuit. If an overcurrent or overvoltage instance occurs, the system automatically cuts off the output voltage. If the DC voltage is not being supplied from the power supply unit, the protective function might be running. If that is the case, turn off the power switch and unplug the power cord. Do not plug in the power cord and do not turn the power switch on again until the root cause is found. In addition, a fuse protects against overcurrent instances. If an overcurrent instance flows into the AC line, the fuse deactivates and cuts off the power distribution. ENWW Engine control system 87