136 Theory of operation C7085-90921
Overcurrent overvoltage protection
Each DC power supply circuit has an overcurrent protective function and overvoltage protective
function. This will prevent a power supply circuit failure by automatically interrupting the output
voltage when anomalies, such as a short circuit, develop on the loads that result in overcurrent flow
or abnormal voltage.
If this function is activated and no DC voltage is output from the low-voltage power supply circuit,
turn OFF the power switch (SW6), unplug the power cord, resolve the anomaly on the load, and
then turn ON the power switch (SW6) again.
Note Protective functions remain active for two minutes after activation. Wait for at least two minutes to
turn the power back on again.
High-voltage power supply
The printer contains two high-voltage PCBs mounted in one assembly. Together, these PCBs
generate the voltage supplied to the primary charging roller, developing sleeve, primary transfer
roller, secondary transfer roller, ITB cleaning roller, and upper fusing roller. DC voltage, or
superimposed AC voltage and DC voltage, is applied to the primary charging roller, developing
sleeve, and ITB cleaning roller. Positive or negative DC voltage is applied to the primary transfer
roller and secondary transfer roller. Negative DC voltage is applied to the upper fusing roller.
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