2.3. SYSTEM FEATURES
2.3.1. Energy Saver Modes *
The machine has three levels of energy saver mode as shown below.
Normal
Level 0
Level 1
Level 2
Main CPU
ON
ON
ON
OFF
Energy Saver CPU
OFF
OFF
OFF
ON
Energy Saver LED
OFF
ON
ON
ON
LCD/LED
ON
OFF
OFF
OFF
+5V Power Supply
ON
ON
ON
OFF
+24VM Power Supply
ON
ON
ON
OFF
Fusing Lamp
ON
80 °C or OFF
80 °C or OFF
OFF
+24VM Power Supply
ON
ON
ON
OFF
In energy saver mode levels 0 and 1, the main CPU monitors and controls
the system. The fusing lamp is either turned off or kept at the standby tem-
perature, depending on the setting of User Parameter Switch 05, bits 6.
In energy saver mode level 2 (also known as the 2-watt energy saver mode),
the main CPU and dc power supplies are shut down. The energy saver CPU
monitors the energy saver key, incoming calls, and the document sensor.
When the energy saver CPU detects activity at one of these, it activates the
+5V supply with the WAKEUP signal to start up the main CPU and other
power supplies (+5VLD, +12.4V, +12VP, and -9V).
The following sections explain how the machine uses these three modes.
Note that energy saver mode will not operate if a printer interface, a G4 inter-
face, or an RS232C interface is installed.
NCU
MFDU
Operation Panel
Energy Saver Key
Energy Saver
LED
Document Sensor
Ring Detection
Circuit
Current Sensor
(Europe/Asia)
MFCE
SCP
(Main CPU)
LPC
PSU
Top/Front Cover
Interlock Switch
+24VD
+24VM
Q6 and Q13
DC/DC
Converter
(+24/+5V)
Q2, Q3 and Q14
+5V
+5VE
5
+24VMON
5
5
24
RESET
COMMAND
STATUS
EXRING
+5VE
+5V
+24VM
+5VE
Motors,
Clutches
and
Power Pack
WAKEUP
Energy Saver
CPU
(IC1)
EXIO--2
(IC4)
+5VE
ON/OFF
HOOK0/1
H515D520.wmf
DETAILED SECTION DESCRIPTIONS
December 21st, 1995
SYSTEM FEATURES
2-48