Sharp FO IS125N Service Manual - Page 93
[2] Circuit description of control PWB, 1. General description, 2. Description of each block - e 16 error
UPC - 074000034372
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[2] Circuit description of control PWB 1. General description The control PWB is composed of the following blocks. 1.1. Main control block 1) Controller block 2) Memory block 3) Modem block 4) Scanner I/F block 1.2. Printer control block 1.3. LAN control block 1.4. Power section 1.5. TEL line interface block 2. Description of each block 2.1. Main control block Main control block consisting of FAX ENGINE (CX95410-12Z) with 32bit microprocessor core, SDRAM (256Mbit), FLASH (16Mbit), FAX MODEM, etc., controls scanning, images processing, FAX communication, user interface, Ethernet interface etc.and printer controlling. 2.1.1 Controller block 1) CX95410-12Z (IC100): pin-176 QFP (Fax Engine) 1. Feature • 32-bit CPU provides convenient functional customization • 1.5 MHz 16-bit ADC with a 3-channel integrated AFE • Embedded Image Processing DSP - Bad pixel correction - Dark level and shading correction - Linearization - Resolution conversion - Sharpening - Error diffusion - Background removal - JBIG compression/decompression • FlexIO supports a variety of system configurations Processing of SCAN video signal and its A/D conversion. - CIS control - Scanner AFE control - Direct thermal, thermal transfer, inkjet and laser print engine direct control - Motor control • ITU-T V.17 facsimile modem function, with T.30, T.4, T.6, T.42 support • Sleep mode to reduce power consumption • Real Time Clock with Battery Backup • High-speed UART with hardware flow control and IrDA support • High-speed SPI interface for serial flash memory • 2-channel, 16 kHz delta-sigma modulator • Optional voice compression/decompression for Digital Telephone Answering Machine (DTAM) application • Optional full-duplex speakerphone function • 3.3V single power supply or 3.3V/1.25V dual supply operation FO-IS125N • Compact lead-free (Pb-free) package CX95410 Fax Engine Controller: 176-pin LQFP CX20548 Codec (IA): 16-pin QFN 2. System Function i) Scan: Scanner control signals are provided by FlexIO port and dedicated I/O to support common CIS scanners. Analog scan sensor data is digitized through this interface using the integrated ADC. ii) Print: Printer control signals are provided by a FlexIO port to support common direct thermal, thermal transfer, and inkjet print mechanisms. GPIOs with hardware timers are available for fail-safe thermal operation. iii) Copy: Simultaneous scan and print operations provide a copy function, which includes support for image scaling (expansion to 400% and reduction to 25%). iv) GPIOs: General purpose inputs/outputs (GPIOs) are provided that may be used to support common interfaces such as an operator panel. Nine GPIOs are available as inputs that can interrupt the ARC CPU. Three GPIOs are available with hardware timers for fail-safe operations. v) Fax Modem: The embedded fax modem function provides synchronous 14400 bps half-duplex modem with error detection and DTMF generation/reception. It provides fax transmission/reception from regular PSTN lines, PBX, or private lines, when interfaced to DAA (Data Access Arrangement) circuitry via the Conexant CX20548 Integrated Analog device. The modem can operate at any standard V.17 data speed up to 14400 bps as well as in V.21 and V.23 modes. The modem is designed for use in Group 3 facsimile machines. It satisfies the requirements specified in ITU-T recommendations V.17, V.29, V.27 ter and V.21 Channel 2, and meets the signaling requirements of T.30. It also performs HDLC framing according to T.30 at all speeds. 5 - 2