Power-Saving Mode - Canon imageCLASS X LBP1238 II Service Manual

The machine has 2 power supply fuses (FU101 and FU102) inside the PCB as an additional protection function. If overcurrent
occurs in the AC line, the power supply fuse blows and cuts off the power supply.
NOTE:
This machine has a function that stops supplying the +24VB and +24VC when the Cartridge Door Switch is turned OFF for the
safety of users and service technicians.
As the power of this machine is turned ON/OFF by the remote switch control circuit, power is supplied to the AC line even when
the Power Switch is turned OFF. Never disassemble the machine while the Power Supply Cord is connected to the inlet.

Power-saving Mode

Overview
Power-saving mode is a function that reduces the printer power consumption.
Description
Power-off
The power switches is pressed.
Standby
Control Panel
DC Controller
PCB
Main Controller
PCB
The reader is turned
ON only when it is
used
State
Standby The machine moves to a standby state by turn-
ing ON the main switch.
Sleep 1A The machine is in a state where the 24V non-
all-night power is ON.
Sleep 1B The machine is in a state where the 24V non-
all-night power is OFF.
Sleep 3 The controller itself gets into a power-saving
mode.
Service er- When an error requiring a service visit occurs,
ror the machine moves to this state.
Sleep
Mode Eco
Exit
The automatic shutdown time has passed.
Standby recovery event
The auto sleep time has passed.
←A job is generated /completed→
No service error (no error requiring a service visit)
has occurred
Description
When introduction of jobs become possible, timers of the auto low power
time and auto sleep time start counting.
When the auto sleep time has elapsed, transition to sleep 1A occurs.
Sleep 1B is a state where CPU moves to an operation state from sleep 3
by a hardware interruption.
In this mode, CPU of the controller has stopped. (The most effective power
saving state)
Power state of the printer remains in power-saving mode so that the ma-
chine can respond to request from service mode.
It is a function that saves power consumption and improves noise reduc-
tion by letting the machine gets into a standby state without turning ON
the engine and reader when recovering from sleep.
Sleep1B
Automatically shifted
depending on the conditions
Sleep1A
25
2. Technical Explanation (Device)
Explanation
of the status
AC OFF
Power-on
Power-saving
Power-off
Service call
Sleep3
Non-all-night
24V ON
Non-all-night
24V ON