Protective Function; Safety; Low-Voltage Power Supply Unit Failure Detection; Energy Saving Function - Canon LBP6670dn Series Service Manual

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Technology > Controller System > Energy Saving Function

■ Protective function

The low-voltage power supply has a protective function against overcurrent and overvoltage
to prevent failures in the power supply circuit. If there flows an overcurrent or an overvoltage,
the system automatically cuts off the output voltage.
If the DC power is not being supplied from the low-voltage power supply, the protective
function may
be running. In such case, turn off the power switch and unplug the power cord. Do not plug in
the power cord or turn the power switch on again until the root cause is found.
In addition, two fuses in the low-voltage power supply protect against overcurrent.
If overcurrent lows into the AC line, the fuse blows and cuts off the power distribution.

■ Safety

For user and service technician's safety, the printer has a function to interrupt 24V power
supply to the fixing unit and the high-voltage power supply unit.
The door switch is turned off and 24V stops under the following condition:
• If the cartridge door is opened (SW301 is turned off)
The printer has the power switch on the DC line so the AC power flows even the power switch
is turned off. Be sure to unplug the power cord before disassembling the printer.

■ Low-voltage power supply unit failure detection

The DC controller determines a low-voltage power supply unit failure, stops +24V1 output and
notifies E808 to the Main controller when it encounters the following condition:
• +24V is higher than a specified voltage
2 Technology > Controller System > Energy Saving Function

Energy Saving Function

This machine is equipped with energy saving function.
The following shows energy saving status and condition of transition.
Condition Description
Panel off Turn OFF the panel.
Deep sleep Turn OFF the panel, engine and
controller. (Only the power lamp
lights up.)
Conditions for Not Entering Deep Sleep
Conditions for Not Entering Deep Sleep
- When a job is in progress (including internal jobs in progress such as calibration and cleaning
except stop state)
- During waiting state (initialization)
- While a door is open
- During the occurrence of a service call (failure)
- During a jam
- During a firmware update
- When connection of an option (Option Cassette) is poor
- When the Toner Cartridge is not installed
- When information cannot be read from the Toner Cartridge memory (including a failure of memory
tag and a disconnection state of memory tag)
- When the life warning of the Toner Cartridge is displayed
Condition of Transition
Press [Power key].
Transition time to sleep mode has elapsed. (Default
setting: 5 minutes)
* When USB is connected, the machine does not
enter deep sleep.
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