1 August 1996ENERGY SAVER MODES
8.5 ENERGY SAVER CONTROL
The block diagram on the next page shows the relationship between the
power supply signals and the command signals for energy saver mode.
There are two CPUs for energy saver mode. One is the CPU/GAPD (Gate
Array Power Drive) on the BICU board and the other is the Energy Saver
CPU on the FCU board.
The +5VE supply is for energy saver mode, and it is always supplied to the
machine. The +5V supply is shut down in some energy saver modes.
Copier configuration
When either the Clear Modes/Energy Saver Mode key is pressed or the
system auto reset timer runs out, the GAPD turns on the Energy Saver LED
and requests the main CPU to reduce the fusing temperature.
When the auto shut off timer runs out, the GAPD turns off the main switch
using the SW_TRG signal. Then IC 11 on the BICU board sends a signal to
the PSU, and the PSU shuts down the +5V, +12V, -12V, and +24V supplies
and cuts the ac power for the fusing lamp.
Copier/printer configuration
The GAPD controls the energy saver function, as in the copier configuration.
When the auto shut off timer runs out, the GAPD keeps the Energy Saver
LED on but requests the main CPU to cut the fusing lamp power.
When the main switch has been turned off manually, the CPU requests the
PSU to shut down the +5V, +12V, -12V, and +24V supplies.
Fax configurations (Copier/fax and Copier/fax/printer)
The Energy Saver CPU monitors the Clear Modes/Energy Saver Mode key,
and controls the Energy Saver LED. When either the Clear Modes/Energy
Saver Mode key is pressed or the system auto reset timer runs out, the
Energy Saver CPU turns the Energy Saver LED on and requests the copier
main CPU to reduce the fusing temperature. When the auto shut off timer
runs out, the Energy Saver CPU keeps on the Energy Saver LED, but
requests the copier main CPU to cut the fusing lamp power. Then the CPU
instructs the PSU to shut down the +5V, +12V, -12V, and +24V supplies.
When the main switch has been turned off manually (night mode), the Energy
Saver CPU turns off the Energy Saver LED, and the fusing lamp goes off.
When the CPU detects one of the energy saver recovery conditions, it
requests the PSU to supply all dc supplies using the /RTRG signal.
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ACEC
