Operation Of Dc Output Circuit - Toshiba e-STUDIO556 Service Manual

3.18.2

Operation of DC Output Circuit

1. Starting operation of the equipment
When the main power switch of the equipment is turned ON, power starts supplying to all the lines
only when two covers (front cover and duplexing unit) are closed.
2. Stopping operation of the equipment
When the main power switch of the equipment is turned OFF, PER-DN signal is output after the
instantaneous outage insurance time (20 ms or more) elapses and then the supply of each voltage
stops. If the supply of voltage of the main power switch line (+5VS, +5VA, +12VA) stops earlier than
the 24 V 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 (50 ms) elapses.
3. Normal stopping (shifting to super sleep mode)
When the [ON/OFF] button on the control panel is pressed for 1 second or more while the main
power 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.
4. Normal starting (recovering from super sleep mode)
When the [ON/OFF] button on the control panel is pressed for 1 second or more during the super
sleep mode, an 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.
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, Bluetooth 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 the setting for receiving confidential data on each line (08-3846) is set to ON
- When operation is being performed in the self-diagnosis mode (Disabled until the main power
switch is turned OFF)
5. 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 1 minute later to
clear the overcurrent protection.
e-STUDIO556/656/756/856(Ver03)
OUTLINE OF THE MACHINE
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