Sharp Digital Copier - Manuals

(2) Printer mode P1) Print data (compressed data) are sent from the host. (Imagedata (Data 1 – 8) P2) Print data are developed by the ASIC and the line memory andconverted into the full dot image data and sent to the dataselect section. (Image data)(VIDEO) P3) The data are sent through the data sele...

3. Operations of each section A. Paper feed, paper transport section (1) Outline The paper feed tray contains about 200 (250) sheets of paper. The paper is passed to the transfer section by the paper feed roller. The paper feed operation is controlled by the paper feed roller clutchand the paper fee...

(3) Operation a. Block diagram b. Operation * The main motor is a 4-phase stepping motor of 2-phase excite-ment bipolar system, which serves as the drive source of the paperfeed and transport system. * The pickup solenoid operates on 24V and turns ON/OFF paperfeed operation. * The following sensors ...

(Paper release operation) The lock lever arm is always pressed onto the paper release lever bythe spring. When the paper release lever is pulled toward you, thelock lever arm is brought into contact with the lower frame so that thepaper pressure plate is fixed at the paper release position. Under th...

* CCD unit Images (light) is converted into an electrical signal (analog signal) bythe CCD. The image signal read by the CCD is converted into a digital signal bthe A/D convertor in the MCU PWB and outputted to the ASIC, wherethe image is processed. * Scanner motor The scanner unit is driven by the ...

The scanning mirror is a 6-surface mirror. Six lines are printed for onerotation of the scanning motor. Laser beams reflected by the scan-ning mirror are passed to the curved mirror by the No. 1 reflectionmirror. Before reaching the curved mirror, the laser beams enter thelaser beam sensor on the st...

(3) Major parts a. Photoconductor section No. Parts Note Name Type Function/operation 1 OPC drum OPC Forms latent electrostatic images. 2 OPC drum earth electrode Connects the OPC drum aluminum layer andthe earth (high voltage PWB). 3 Main charger electrode Connects the main charger output (highvolt...

b. Development section No. Parts Note Name Type Function/operation 1 Developing roller Attaches toner to the latent electrostaticimages on the OPC drum to convert it intoa visible image. 2 Developing doctor Controls toner quantity on the developingroller and charges toner. 3 Developing biaselectrode...

b. Major parts functions and operations 1 Developingroller 5 Toner seal 9 Dischargebrush 2 Doctor 6 Transfercharger roller 10 Main chargerbrush 3 Toner stirringplate 7 Separationelectrode 11 Toner seal 4 Toner supplyroller 8 Phot conductordrum 12 Discharge(Earth) sheet <1> Photoconductor drum ...

c. Actual image forming process Step 1 (Cleaning, charging): Residual toner on the OPC drum is stirred and negative charges are dis-tributed evenly on the OPC drum.(The OPC drum is evenly charged.) The main charger brush is of roller shape and is rotating. The main charger brush stirrs residual tone...

Step 3 (Development): Toner is attached to the latent electrostatic images formed on the OPC drum. Toner enters between the developing roller and the doctor, and a thinlayer of toner (a certain fixed amount) is formed on the developingroller by a pressure applied to the doctor. Toner is negatively c...

d. OPC drum surface potential <1> OPC drum surface potential shift in printing <2> OPC drum surface potential and developing bias voltage during developing -310V -850V OPC drum surface potent ial (-V) Charging/cleaning Laserbeams Dark areapotential Toner attractionpotential Light area po...

(3) Operation a. Wiring diagram b. Operation The heater lamp ON/OFF is controlled by the detection signal (volt-age value) from the thermistor to maintain the heat roller surfacetemperature at the optimum level. The heat roller surface temperature is controlled to 160/155 ˚C in theprint mode and to ...

G. Electrical section (1) Block diagram a. Major sections operations and functions MCU (PCU) PWB The CPU controls the engine, and the ASIC performs image process.Image data (analog signals) from the scanner (reading) section areconverted into digital signals by the A/D convertor and image process(ar...

ICU PWB Print data from the host (PC) are developed by the ASIC and the linememory (DRAM) to converted into full dot image data, which are thenoutputted to the data select section in the MCU PWB. The machinestatus data from the MCU PWB are outputted tot he host (PC). Inaddition. the ASIC controls th...

q COPYRIGHT  1998 BY SHARP CORPORATION All rights reserved. Printed in Japan. No part of this publication may be reproduced, stored in a retrieval system, or transmitted. In any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without prior written permission of ...