Operation Of Dc Output Circuits - Toshiba e-STUDIO 2555C Service Manual

3.19.3

Operation of DC Output Circuits

1. Starting operation of the equipment
When the main switch of the equipment is turned ON, power starts supplying to all the lines only
when two doors (front cover and ADU) are closed
2. Stopping line output
When the main switch of the equipment is turned OFF, PWR-DN signal is output after the
instantaneous outage insurance time elapses and then the supply of each voltage stops. If the
supply of voltage of the main line (+5VS, +12VA) stops earlier than the 24V line does, it may cause
the damage of the electron device on each control circuit. To prevent this, the supply of these
voltages stops after the PWR-DN signal is output and the minimum retaining time elapses.
3. Output protection
Each output system includes an overcurrent and overvoltage protection circuits (a fuse and internal
protection circuit). This is to prevent the defectives (damage or abnormal operation of the secondary
circuit) which may be caused by an overcurrent due to a short circuit or an overvoltage due to a
short circuit between different voltages. If the protection circuit is activated (except the case the fuse
is blown out), remove the causes such as short-circuit. Turn ON the power again to clear the
overcurrent protection.
4. Recovering from super sleep mode (normal starting))
When the [ON/OFF] button on the control panel is pressed during the super sleep mode, a super
sleep mode shifting/recovering signal (SYS-EN) is output from the SYS board and then voltage
starts being supplied to all the lines, if no error was detected.
5. Recovering from super sleep mode (when receiving a packet)
When a packet from a network is received during the super sleep mode, the mode is shifted to the
sleep mode.
When packets are received frequently, a control is performed to keep the sleep mode for a specified
period.
- If packets are received 42 times or more within 6 hours, the time setting for shifting to the super
sleep mode will be automatically changed to approx. 10 minutes when the 42 times are counted.
- Receiving of the packets to perform printing or fax jobs is not counted.
- If the time setting for shifting to the super sleep mode is set to 10 minutes or more, it will be
reflected.
- If the time setting for shifting to the super sleep mode has been changed to 10 minutes due to the
above auto-change, it will be cleared when the power is turned OFF and then back ON.
6. Shifting to super sleep mode (normal stopping)
When the [ON/OFF] button on the control panel is pressed for 1 second or more while the main
switch of the equipment is toggled ON, a super sleep mode shifting/recovering signal (SYS-EN) is
output from the SYS board after the initialization is finished and then all lines for output voltage
except +5VS are closed.
The Super sleep mode is disabled under the following conditions.
- When the Super sleep mode is set to be disabled on the control panel, TopAccess and with the
code 08-8543
- When the Wireless LAN Module, e-BRIDGE ID Gate or Data Overwrite Enabler is installed, or
when the IPsec Enabler is installed and its function is set to be enabled
- When operation is being performed in the self-diagnosis mode (Disabled until the main switch is
turned OFF)
7. State of the power supply
- Power OFF
e-STUDIO2555C/3055C/3555C/4555C/5055C
OUTLINE OF THE MACHINE
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