Canon ImageRUNNER 1022iF, Service Manual, Page: 70 / 270

Chapter 3
3-4
Toner Level Detection Mechanism
While the machine is in wait state, the toner level detection signal (ADDTNR; based on the comparison of the developing bias output and the antenna output inside
the cartridge) occurring when the developing AC bias is detected during normal rotation to monitor the toner level inside the cartridge.
3.1.5 Analog Processor PCB
0013-1078
/ / / / iR1018 / iR1018J / / iR1022A / iR1022F / iR1022i / iR1022iF /
Image Processing Control Block
The analog image data read by the contact sensor is converted into digital image data and sent to the ASIC of the image processor PCB.
Drive Control Block
The drive control mechanism acts on the reader motor and the ADF motor by the motor drive IC of the analog processor PCB.
3.1.6 Power Supply PCB
0013-1079
/ / / / iR1018 / iR1018J / / iR1022A / iR1022F / iR1022i / iR1022iF /
Switching Regulator
The following is generated using power from the power outlet for loads: +24DC, +5 VDC, +5VRDC, +3.3VDC, +3.3VRDC.
3.1.7 Relay PCB
0013-1080
/ / / / iR1018 / iR1018J / / iR1022A / iR1022F / iR1022i / iR1022iF /
The signals from the sensors/solenoids/clutches are sent to the DC controller PCB through the relay PCB.
3.1.8 Control Panel PCB
0013-1081
/ / / / iR1018 / iR1018J / / iR1022A / iR1022F / iR1022i / iR1022iF /
Key Detection and LCD/LED Drive
The keys are monitored, and the LCD and LEDs are driven.
LCD Function
The LCD is controlled according to the display signals from the image processor PCB.
Serial Communication Control
The state of the control keys is monitored based on serial communications with the image processor PCB. LCD and LED drive data are received.
3.1.9 NCU PCB (if equipped with fax functions)
0013-1082
/ / / / iR1018 / iR1018J / / iR1022A / iR1022F / iR1022i / iR1022iF /
2-Line/4-Line Conversion Circuit
Signals from a 2-line telephone line are converted into 4-line signals (transmission signals and reception signals). Also, the transmission signals from the image
processor PCB are prevented from entering the reception circuit.
Dial Pulse Generation Circuit
The dial pulse generation circuit generates dial pulses by turning on and off the relay inside it according to the control signals from the image processor PCB. It
then sends the dial signals to the telephone line by way of the modular jack PCB.
Off-Hook Detection Circuit
An off-hook state is detected with reference to the direct current flowing into the circuit, occurring when the telephone connected to the telephone terminal of the
modular jack PCB is off the hook.
Line Voltage Conversion Circuit
The primary side of the NCU PCB is controlled using a line voltage of +48 VDC. In light of this, the DC component is cut by the capacitor, and only the audio
signals are converted into voltages suited to the modem level.
3.1.10 Network PCB (if equipped with network functions)
0013-1083
/ / / / iR1018 / iR1018J / / iR1022A / iR1022F / iR1022i / iR1022iF /
The communications with the PC are controlled. The image data from the PC is converted into print data for the machine, and is sent to the image processor PCB.
3.1.11 Modular Jack PCB (if equipped with fax functions)
0013-1084
/ / / / iR1018 / iR1018J / / iR1022A / iR1022F / iR1022i / iR1022iF /
The signals from the 2 modular jacks (for telephone line and telephone connection) are communicated to the line voltage conversion circuit of the NCU PCB, and
the signals from the fax are communicated to the telephone line.
3.1.12 Modem PCB (if equipped with fax functions)
0013-1085
/ / / / iR1018 / iR1018J / / iR1022A / iR1022F / iR1022i / iR1022iF /