Service manual

Chapter 9
9-2
When the CPU on the engine controller outputs a fan half speed signal (FAN_HALF), the fan drive voltage switching circuit supplies a +16 V fan drive voltage to
turn the heat exhaust fan at the half speed.
Fan Control Sequence
F-9-4
E805-0000 (Main body fan error)
When the cooling fan of the main body starts, the fan lock detection signal (FAN_LOCK) has been held at the "H" level for longer than the prescribed time.
9.3 Power Supply System
9.3.1 Power Supply
9.3.1.1 Outline
0011-2193
iR2016J / iR2016 / iR2020 / / iR2016i / iR2020i
When the main power switch (SW1) is turned on, AC power is supplied to the low-voltage power supply circuit in the power supply PCB.
The low-voltage power supply circuit supplies +3.3 V, +5 V, and +24 V to operate the machine.
+24 V is supplied to the motors, fan, electromagnetic clutch, solenoid, etc. +5 V and +3.3 V are supplied to the sensor, etc.
There are two types of +24 V voltages: +24 V which is normaly supplied from the low voltage power supply and +24 VR which is cut off when the front cover or
the left door is opened. The +24 VR also plays the role of a door open detection signal (DOPEN). This signal allows the CPU to detect that the front cover or the
left door has opened.
T-9-1
F-9-5
9.3.1.2 Rated Output of the Power Supply PCB
0011-2195
iR2016J / iR2016 / iR2020 / / iR2016i / iR2020i
Part Name Function
Power supply PCB Generates DC power from AC power.
Option power supply PCB (option) Generates DC power from AC power for the options.
Main power switch (SW1) Supplies AC power to the power supply PCB.
Front cover switch (SW2) Detects opening/closing of the front cover and cuts off +24 VR.
Left door switch (SW3) Detects opening/closing of the left door and cuts off +24 VR.
INTR STBY WMUPR
: Half speed (+16V): Full speed (+24V)
PRINT PRINT LSTR
30sec
STBY
Heat Discharge Fan
(FM1)
Registration sensor
(SR209)
Fixing Drive Motor
(M201)
Power switch ON/
Going out of sleep mode
Copy start key ON
Power switch OFF
/
Going into sleep mode
P1
NF NF
Power supply PCB
: AC
: DC
F1 F2
SW1
TP1
H2
H1
Heater drive
circuit
RL1
SW2
SW3
Reader
controller
PCB
Low-voltage
power supply
circuit
+24V +24VR
Option
power supply
PCB
Option
- Finisher
- Inner 2-way tray
- Duplex unit
- Cassette feeding
module
+24Vop
DC
controller
PCB
Image
Processor
PCB
Control panel
FAX board (option)
Motor
Sensor
DADF (option)
Laser unit
Motor
Clutch
Solenoid
Fan
Sensor
HVT
PCB
+24V
+5VR
+3.3VR
+5V
+3.3V
+24VR
+24V
+5VR
+3.3VR
+24VR
+5VR
+3.3VR