Protective Function; Safety; Low-Voltage Power Supply Unit Failure Detection; Power-Saving Mode - Canon D1300 Series Service Manual

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Technical Overview > Controller System > Low-voltage Power Supply > Power-Saving Mode

■ 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.
The door switch is turned off and 24V power supply to the Fixing Assembly and the High-
voltage Power Supply Unit stops under the following condition:
• If the cartridge door is opened (SW2 is turned off)

■ Low-voltage Power Supply Unit Failure Detection

The Engine Controller determines a Low-voltage power supply unit failure and stops +24V
output. Once 24V output is stopped, 3.3V of the engine CPU stops, so notification is not
made. Likely, 3.3V of the controller stops, so the machine seems power-off.
• +24V is higher than a specified voltage
• +3.3V is higher than a specified voltage
• +5V is higher than a specified voltage
2 Technical Overview > Controller System > Low-voltage Power Supply > Power-Saving Mode

■ Power-Saving Mode

This is the function to save power consumed by the printer.
The table below lists various power-saving modes.
Power-Saving Mode
Stand-by at power-OFF on the reader
Power-saving (3W) at power-off on the reader, the engine and the display (LCD)
The main controller enters the power-saving mode.
Power-ON status
Power-OFF
Power-saving status
Power-OFF status
Power- Power-
OFF ON
The condition that
Standby
there is no service error.
Operation
[1]
Reader
panel
[2]
Power-saving
[1]
[1] [3]
Engine
Main
controller
[4]
Printing
[4]
[4]
[4]
[1] Press [Power-saving] key.
(Power-saving release)
[2]
Enters auto-sleep status.
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Status
T-2-7
Service error
Service error
Sleep3
Sleep1
[2]
Automatic transition
depending on the condition
Sleep2
Automatic transition
depending on the condition
F-2-12
[3] Detects hook.
[4]
Start / complete jobs.
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