Xerox WorkCentre 5790 Series Service Manual page 90

01K Sleep Mode RAP
Use this RAP to diagnose problems entering or exiting sleep mode.
Sleep Mode Operation
The machine is designed to be energy efficient by reducing the power consumption after peri-
ods of inactivity. The machine has three power modes:
• Standby or run mode - full power consumption. In this mode, the energy saver button,
ure 1, is not illuminated.
• Low power mode - the fuser temperature is reduced to save power, yet allow a quick
return to run temperature. In this mode, the energy saver button,
• Sleep mode - power consumption for the whole machine is reduced to below 10 watts by
powering down all but the essential parts, see the note below. In this mode, the energy
saver button, Figure 1, is blinking.
NOTE: When the machine is in sleep mode, +12V sleep is supplied from a special power
supply located within the LVPS to the power distribution PWB. The power distribution
PWB supplies +3.3V sleep and 12V sleep to power the PWBs that follow:
– Riser PWB.
– Fax PWB.
– Single board controller (SBC) PWB.
– UI control PWB.
Off to Run Mode
When the On/off button is pressed, the IOT PWB sends the PS ON signal to the LVPS to
power-on the low voltage DC outputs of the machine. The PS ON signal is diode coupled
within the LVPS to the sleep signal, therefore whenever the main power supply is on, the sleep
mode power supply is on. When the machine is in run mode the IOT watchdog signal and the
SBC watchdog signal keep the PS ON signal active.
Run Mode to Sleep Mode
After a period of machine inactivity that equates to the sum of the low power mode duration
plus the sleep mode duration, as set in the customer tools options, both the SBC and IOT
watchdogs are stopped. After approximately 4.5 seconds the PS ON signal goes inactive,
causing the low voltage DC outputs of the machine to switch off. Before the SBC and IOT stop
their watchdogs, the UI watchdog is started, this causes the sleep signal to be active; this in
turn keeps the sleep mode power supply on when the main power supply switches off.
Sleep Mode to Run Mode
Exit from sleep mode requires one of the wake events that follows to occur:
• An operator presses the on/off switch. This causes the IOT to generate the PS ON signal
to the LVPS, which in turn switches on the low voltage DC outputs of the machine and
also asserts the LOW PWR signal to enable AC power to the finisher.
• An operator touches the UI screen or presses any UI buttons. This causes the UI to acti-
vate the PME wake up signal. The wake signal is passed through the single board con-
troller PWB to the IOT. This causes the IOT to generate the PS ON signal to the LVPS,
which in turn switches on the low voltage DC outputs of the machine and also asserts the
LOW PWR signal to enable AC power to the finisher.
Status Indicator RAPs
01K
• An incoming Fax job. To indicate a wake up call has been initiated the Fax PWB will gen-
erate a power management event/wake up (PME/wake up) signal. The PME/wake up sig-
nal is sent via the riser PWB through the PCI bus to the single board controller PWB to
the IOT PWB. The IOT on/off control circuit detects the PME/wake up line is active and
enables the PS ON signal to the LVPS, which in turn switches on the low voltage DC out-
puts of the machine, and also asserts the LOW PWR signal to enable AC power to the fin-
isher.
Fig- • An incoming print job to the single board controller PWB will generate a power manage-
ment event/wake up (PME/wake up) signal that is passed through single board controller
PWB to the IOT PWB. This causes the IOT to generate the PS ON signal to the LVPS,
which in turn switches on the low voltage DC outputs of the machine and also asserts the
Figure 1, is illuminated.
LOW PWR signal to enable AC power to the finisher.
Reading or Setting the Power Save Duration Times
Access the power save feature by performing the following:
1. Access the customer administration tools screen,
2. Touch the More button.
3. Touch the Power Saver Administration button.
4. Set the Standby/Low Power duration times.
5. Touch save.
The default time for standby mode to low power mode is 15 minutes, the minimum value is 1,
the maximum value is 120.
The default time for low power mode to sleep mode is 45 minutes, the minimum value is 10,
the maximum value is 120.
To change either of the timing values, touch the appropriate input area, enter the new value
using the keypad. Touch the Save button to confirm the change.
Initial Actions
Make sure that the cooling fan,
troller PWB, not PJ134 on the
If the machine does not go into low power mode and the machine has the embedded Fax
option, ensure that the embedded Fax option has been enabled an set up. Sleep mode will not
operate correctly if the embedded Fax option is not set up.
Procedure
Ensure that the electricity to the machine is switched off while performing tasks that do
not need electricity. Refer to
death or injury. Moving parts can cause injury.
Refer to Sleep Mode to Run
event.
Y N
Refer to
power mode after both power save duration times have elapsed.
Y N
The machine switches off when it should enter sleep mode.
A B
May 2013
2-58
PL 3.24 Item 2 is connected to PJ221 on the
Power distribution PWB.
WARNING
GP 14. Disconnect the power cord. Electricity can cause
Mode. The machine remains in sleep mode after a wake
Run Mode to Sleep Mode. The machine remains in standby mode or low
GP 24.
Single Board Con-
Xerox® WorkCentre® 5790 Family