Over-current/over-voltage protection
The low-voltage power supply (LVPS) has a protective circuit against over-current and over-voltage to
prevent failures in the power supply circuit. It automatically stops supplying the DC voltage whenever
excessive current flows or voltage abnormally increases.
If the DC voltage is not being supplied from the LVPS, the protective function might be running. In this
case, turn off the power switch and unplug the power cable. Do not turn the power switch on until the
problem is identified.
The DC controller notifies the formatter of a LVPS failure when the protective function is activated.
In addition, the fuser control and the LVPS each have one fuse to protect against over-current. If
over-current flows into the AC line, the fuse fails and AC power is stopped.
For personal safety, the product interrupts +24VB and +5VB power when the interlock switch is
turned off. Accordingly, the DC voltage to the following components is interrupted:
●
Fuser
●
High-voltage power supply
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Delivery fan
●
Fuser edge area cooling fan (rear)
●
Fuser edge area cooling fan (front)
●
Drum motor
●
ITB motor
●
Fuser motor
●
Developer alienation motor
●
Pickup motor
●
Registration motor
●
Fuser shutter motor
●
Duplex re-pickup motor
●
Duplex feed motor
●
Duplex switch back motor
●
Laser/BD PCA
WARNING! The remote switch control circuit turns the product power on or off so that the AC power
flows even if the power switch is turned off. Unplug the power cord before disassembling the product.
WARNING! If you believe the over-current or over-voltage protection circuits have been activated,
do not connect the product power cord or turn on the product power until the cause of the failure is
found and corrected.
ENWW Engine-control system 17
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