HP Color LaserJet CM1312 Service Manual - Page 93
Low-voltage power supply, Fuser failure detection,
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Low-voltage power supply The low-voltage power supply and the fuser power supply convert AC power from the power receptacle into DC power to cover the DC loads. Figure 5-5 Low-voltage power supply AC input Fuse FU901 Noise filter Power switch SW801 Fuse FU801 Fuser control circuit Fuser power suppl y DC controller Noise filter Only for the 200V model Frequency detection circuit Rectifying circuit +24V generation circuit +3.3V generation circuit FREQSNS REM24V +24V +3.3V Protection circuit Low-voltage power supply Fuser failure detection The DC controller determines a fuser unit failure, sets the FUSER HEATER DRIVE (FSRD+, FSRD-) signals to inactive, releases the relay to interrupt the fuser heater power supply, and notifies the formatter of a fuser unit failure when it encounters the following conditions. ● Start-up failure ● Abnormally low temperature ● Abnormally high temperature ● Fuser heater drive circuit failure ENWW Engine control system 79