Circuit Description Of Control Pwb - Sharp FO IS125N - B/W Laser - All-in-One Service Manual

[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 communi-
cation, 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 Tele-
phone Answering Machine (DTAM) application
• Optional full-duplex speakerphone function
• 3.3V single power supply or 3.3V/1.25V dual supply operation
• 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 inte-
grated 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 hard-
ware timers for fail-safe operations.
v) Fax Modem: The embedded fax modem function provides
synchronous 14400 bps half-duplex modem with error detec-
tion and DTMF generation/reception. It provides fax transmis-
sion/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 require-
ments of T.30. It also performs HDLC framing according to T.30
at all speeds.
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FO-IS125N