Sharp UX-4000M Service Manual - Page 90

UX-4000MU FO-2950MU/C k. Top margin control Top margin is set according to the number of lines (the number of HSYNC interrupt) from detail paper Pin On to LASER input. The interval between Pin On and point D is 52.6747 mm. The interval between Point D and point B is: 27.33 (C-D) + 8.3769 (B-C) = 35.7069 mm If top margin is 4 mm, 52.6747 - 35.7069 + 4 = 20.9678 m In case of the actual software processing, chattering of the sensor is considered to be observed for 9 msec. The processing speed is 50 mm/sec; while chattering is being observed, paper is fed by 0.45 mm (9 x 50/1000 = 0.45 mm). In order to gain top margin of 4 mm, printing data should be processed after paper is fed by 20.5178 mm (20.9678 - 0.45 = 20.5178 mm) following PIN On detection. The base machine resolution in the sub-scanning direction is 391.16 dpi; If the value 20.5178 mm is converted into the number of lines, 315.9 lines are obtained from 391.16 x 20.5178/25.4. Accordingly the software set value is considered to be based on 316 lines. Similarly, considering from the fact that resolution of PC printing is 600 dpi, the number of lines is 484.6 lines (600 x 20.5178/25.4=484.6). The software set value is based on 485 lines. Pout sensor Paper exit roller LASER Process speed 50mm/sec OPC drum speed 49mm/sec=(50x0.98) Discharge brush nip 5.7523mm Fusing 9.3389mm(A-B) 8.3769mm(B-C) B C A OPC drum Developing roller nip 2.7693mm Diameter ø24mm D 27.33mm(C-D) Pin sensor Paper feed roller 30.3522mm(D-A) Transfer 52.6747mm(from Pin On) roller ø13.4(13.7) 40.0697mm(from Pin Off) 100.4mm(from Pin On) 37.2mm (until Pin On) 123.8410mm(from Pin On until Pout On) 207.875mm(from Pin Off) l. Modem (FM214) block Fig. 21 FEATURES • Group 3 facsimile transmitting/receiving - ITU-TV. 17, V. 33 (Model FM214) - ITU-TV. 29, V. 27 ter, T.30, V. 21 channel 2, T.4 - ITU-TV. 17 and V. 27 ter short train - HDLC framing at every speed - Receiving dynamic range: 0 dBm to -43 dBm - Automatic adaptation equalizer - Fixed/programmable digital equalizer - DMTF detection and tone detection - ITU-TV, 21 channel 2 FSK 7E flag detection - Ring detector - Programmable transmission level - Programmable single/dual tone transmission • Room monitor - DTMF detection, tone detection and tone transmission - Type II transmitter ID CAS detection - Near-end echo cancellation - Monitor recording /message reproducing by voice or audio codec • V.23 and Type I transmitter ID - Duplex mode TX = 75 bps, RX = 1200 bps TX = 1200 bps, RX = 75 bps • Half duplex mode TX = RX = 1200 bps - Serial/parallel data mode - Programmable parallel data mode - Data bit 5, 6, 7, or 8 - Stop bit 1 or 2 - Mark, space, even number and odd number parity - Break function - Transmitter sequence routine - Fixed equalizer • Programmable interface memory • General input pin (GPI) 8 and general output pin (GPO) 8 • DTE interface: 2 ports - Selective microprocessor bus (6500 or 8085) - ITU-T V. 24 (EIA/TIA-232-E interchangeability) interface • TTL and CMOS interchangeability • 3.3V/5V performance • Consumption power - Operating mode: 200 mW (standard), 275 mW (-V option), 300 mW (-S option) - Sleep mode: 1 mW (-V option, -VS option) • Package - 128 pin TQFP INTRODUCTION The conexant FM214 MONOFAX modem is a synchronous 14400 bits per second (bps) half-duplex ,modem with error detection and DTMF reception. It has low power consumption and requires +5V, +3.3V DC power supply. The modem is housed in a signal VLSI device package. The modem can operate over the public switched telephone network (PSTN) through line terminations provided by a data access arrangement (DAA). The FM214 is designed for use in Group 3 facsimile machines. The modem satisfies the requirements specified in CCITT recommendations V.29, V.27 ter, V.21 Channel 2 and T.4, and meets the binary signaling requirements of T.30. The modem can operate at 14400, 9600, 7200, 4800, 2400, or 300bps, and also includes V.27 ter short training sequence option. The modem can also perform HDLC framing according to T.30 at 14400, 9600, 7200, 4800, 2400, or 300 bps. The modem features a protectors which operate concurrently with the V.21 channel 2 receiver. The voice mode allows the host computer to efficiently transmit and receive audio signals and messages. General purpose input/output (GPIO) pins are available for host assignment in the 128 pin PQFP. The modem's small size, single voltage supply, and low power consumption allow the design of compact system enclosures for use in both office and home environments. MONOFAX is a registered trademark of conexant systems, Inc. 5 - 18 manuals4you.com