Toshiba e-studio205L, Service Handbook, Page: 618 / 672

e-STUDIO205L/255/305/355/455 © 2009 TOSHIBA TEC CORPORATION All rights reserved
POWER SUPPLY UNIT
9 - 2
9.2 Operation of DC Output Circuits
1. Starting line output
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, +5VA, +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. 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
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, 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 switch is
turned OFF)
6. State of the power supply
- Power OFF
The main switch of the equipment is turned OFF. Since DC voltage is not supplied to each board,
the equipment is not operable.
- Normal state (including Energy saving mode)
The main switch of the equipment is turned ON and DC voltage is supplied to each board. When
the cover of the equipment is closed, 24V DC voltage is supplied and the equipment enters into
the ready/printing state.
- Sleep mode
Since +5VB, +5VD, +12VB and +24V DC voltages are not supplied but +12VA, +5VA and +5VS
DC voltages only, the equipment does not enter into the ready state.