Figure 4-7 Hard-disk power connector
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 is activated and the power supply circuit does not
generate DC voltage, turn the power off, correct the problem, and then turn the MFP on again.
The circuit has two fuses (FU1, FU2) that break and cut off the output voltage if overcurrent flows
through the AC line.
Toner detection
To monitor the toner level, the MFP uses two plate antennas and a toner-level circuit in the high-
voltage power supply circuit. The DC controller PCA detects the toner level and monitors the output
signal of the toner-level circuit. The signal is fed back to the DC controller PCA from the antennas
during the wait and standby operating periods. The DC controller PCA detects toner level from 1% to
100%. If the DC controller PCA detects a low toner level, a message appears on the control-panel
display.
Cartridge detection
The DC controller PCA detects the presence of the cartridge by using information stored in plate
antenna 2 and the print-cartridge memory tag. The DC controller PCA detects the presence or
absence of the print cartridge during the wait period.
ENWW Engine-control system 127
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