HP LaserJet P4510 Service Manual - Page 126
Overcurrent/overvoltage protection
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● Fuser sleeve ● Pressure roller Figure 5-12 High-voltage power supply Cartridge Fuser sleeve From antenna From antenna Photosensitive drum To primary charging roller To developing cylinder Pressure roller Transfer roller ANT2 ANT1 FILMBIAS KAATUBIAS TB20 TB21 TB504 T503 TB502 TB501 TB503 Fuser high-voltage generation circuit Transfer high-voltage generation circuit TRAD High-voltage power supply Primary charging high-voltage generation circuit Power supply unit Toner level detection circuit Developing highvoltage generation circuit TNRSP2 TNRSP1 DC controller Overcurrent/overvoltage protection If a short-circuit or other problem on the load side causes an excessive current flow or generates abnormal voltage, the overcurrent/overvoltage protection systems automatically cut off the output voltage to protect the power-supply circuit. If the overcurrent or overvoltage protection system are activated and the power-supply circuit does not generate DC voltage, turn the power off, correct the problem, and then turn the product on again. The circuit has two fuses (FU1, FU2), which break and cut off the output voltage if overcurrent flows through the alternating current (AC) line. 112 Chapter 5 Theory of operation ENWW