FS-6020
2-3-6
(3) Interlock switch - eco-power circuit
24 V DC
output circuit
Fixing
heater lamp
control circuit
Rear cover
interlock
switch
Top cover
interlock
switch
Power source PWB
Engine/high voltage PWB
+24V
+24V
+24V1
+24V2
ECOPOWER
TCOVOPN
RCOVOPN
+24V3 +24V4
Q16
Q15
Eco-power
ON/OFF circuit
2
1
3
45
CPU
(U1)
Figure 2-3-6 Interlock switch - eco-power circuit
The 24 V DC power source line is shut off by the top cover interlock switch or the rear cover interlock switch that is turned
OFF when the top cover or the rear cover is opened. At the same time, the 24 V DC power supply is stopped to the motor and
clutch and it is also output to the CPU of the engine/high voltage PWB as the cover open detection signal.
The 24 V DC power is divided into five groups of +24V, +24V1, +24V2, +24V3 and +24V4 as follows, and the loads that
supply the 24 V DC power source or the cover open detection signals are different.
1 +24V Cooling fan motor
2 +24V1 Rear cover open detection signal (RCOVOPN)
3 +24V2 Top cover open detection signal (TCOVOPN), paper feeder, duplexer and power source PWB (Fixing
heater lamp control circuit)
4 +24V3 Main motor, eraser, main PWB, polygon motor, feed clutch, MP tray feed clutch, middle feed clutch
and MP tray feed solenoid
5 +24V4 Engine/High voltage (High voltage section)
In the eco-power mode, the circuit shuts off the +24V power source that is used by the printer unit in order to reduce the
power consumption. In the eco-power mode, the eco-power mode signal (ECPOWER) becomes L level, which is output
from the CPU of the engine/high voltage PWB. The signal at this level turns off the transistors (Q15, Q16) of the eco-circuit,
accordingly the supply of +24V3 and +24V4 to the power line is shut off and the operation of connected load will stop.
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