Canon MF6530 Service Manual - Page 54

Chapter 2 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. 2.1.5 Analog Processor PCB 0011-3551 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. 2.1.6 Power Supply PCB 0011-3552 Switching Regulator The following is generated using power from the power outlet for loads: +24DC, +5 VDC, +5VRDC, +3.3VDC, +3.3VRDC. 2.1.7 Relay PCB 0011-3553 The signals from the sensors/solenoids/clutches are sent to the DC controller PCB through the relay PCB. 2.1.8 Control Panel PCB 0011-3554 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. 2.1.9 Network PCB (if equipped with network functions) 0011-3555 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. 2.1.10 NCU PCB (if equipped with fax functions) 0011-3556 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. 2.1.11 Modular Jack PCB (if equipped with fax functions) 0011-3557 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. 2.1.12 Modem PCB (if equipped with fax functions) 0011-3558 F-2-4 MPU (IC1) Processes JBIG coding/decoding, controls combinations over lines, and controls SDRAM. PATCH (IC40) controls the various boards (NCU, speaker). SDRAM Controls coding/decoding of image data for transmission/reception, and stores data for the MPU work area and transmission/reception data. 2-4