HP LaserJet 9040/9050 Service Manual - Page 94
High-voltage power supply circuit,
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High-voltage power supply circuit The high-voltage power supply circuit applies a high-voltage bias to the primary charging roller, the developing cylinder, the pre-transfer upper guide, the transfer charging roller, the separation static charge eliminator, and the pressure roller through the ASIC (IC 202), according to instructions it receives from the CPU (IC201) on the DC controller PCA. The high-voltage power supply circuit also detects the toner level. Figure 26. High-voltage power supply block diagram 78 Chapter 5 Theory of operation
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78
Chapter 5 Theory of operation
High-voltage power supply circuit
The high-voltage power supply circuit applies a high-voltage bias to the primary charging roller, the
developing cylinder, the pre-transfer upper guide, the transfer charging roller, the separation static
charge eliminator, and the pressure roller through the ASIC (IC 202), according to instructions it
receives from the CPU (IC201) on the DC controller PCA. The high-voltage power supply circuit also
detects the toner level.
Figure 26.
High-voltage power supply block diagram