HP 8550mfp Service Manual - Page 214
Power supply, C-link communication, Power-on sequence
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Power supply A universal power supply is activated when the printer's power switch is turned on. The printer's paper handling controller sends a power-on signal to the power supply through the controller PCA. The power supply provides +26 V (volts) for motors and +5 V for sensors and controller electronics. The power supply is also activated when the controller PCA is set to service mode. Power-on sequence During the power-on sequence, an internal self-test is performed. All motors, electronics, and main assemblies are tested. After successful power-on sequence, the user LED is lit green. If the power-on sequence is NOT successful, a jam condition or a hardware malfunction is indicated through the printer control panel and the user LED is lit amber. C-link communication Communication and control of the C-link devices is accomplished through the paper-handling controller embedded on the formatter PCA (printed circuit assembly) in the printer. The C-link devices have their own power supplies and controller boards that receive signals and commands from the paper-handling controller. Figure 72. C-link cabling 212 Chapter 5 - Theory of operation EN