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IMAGE PROCESSING

22 December 1998

2-16

2.4 IMAGE

PROCESSING

2.4.1 OVERVIEW

The CCD generates two analog video signals. The SBU (Sensor Board Unit)
converts these analog signals to 8-bit digital signals, then it sends these digital
signals to the SCU (Scanner Control Unit) board through the IOB board. The IPU
(Image Processing Unit) IC on the SCU does the image processing, then the image
data goes to the computer through the Memory Control IC and the SCSI controller.

The CIS (Contact Image Sensor) unit in the duplex model for reverse-side
scanning outputs two digital signals. The IPU on the RCU (Reverse Control Unit)
board does the image processing, then the image data goes to the computer
through the SCU.

CCD

S C U

CIS

C C D

(Duplex model only)

D R A M

I P U

M e m o r y

Control

IC

S C S I

Control

IC

S B U

IOB

R C U

I P U

M e m o r y

Control

IC

D R A M

G411D508.WMF

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Содержание HS2P

Страница 1: ...HS2P Machine Code G407 G408 G410 G411 Service Manual Issued on 22nd December 1998 Ricoh Co Ltd...

Страница 2: ...he country in which the scanner is used 5 The use of cables other than the shield I O cables or equivalent specified will invalidate the certification of this scanner and may cause interference levels...

Страница 3: ...1 2 2 SCANNER MECHANISMS 2 3 2 2 1 BOOK MODE 2 3 2 2 2 ADF MODE 2 7 2 3 PAPER MISFEED DETECTION 2 14 2 4 IMAGE PROCESSING 2 16 2 4 1 OVERVIEW 2 16 2 4 2 SBU 2 17 2 4 3 IPU IMAGE PROCESSING UNIT 2 18 2...

Страница 4: ...CTIONS 4 1 4 1 DIP SWITCH SETTINGS 4 1 4 2 LEDs TEST POINTS 4 6 4 2 1 LEDs 4 6 4 2 2 TEST POINTS 4 6 4 3 SPECIAL TOOLS 4 6 5 REPLACEMENT AND ADJUSTMENT 5 1 5 1 COVERS 5 1 5 1 1 ADF EXTERIOR 5 1 5 1 2...

Страница 5: ...PU 5 22 6 TROUBLESHOOTING 6 1 6 1 SELF DIAGNOSTICS 6 1 6 2 CHECK ITEMS 6 1 6 2 1 ITEMS CHECKED DURING INITIALIZATION 6 1 6 3 ERROR INDICATION 6 2 6 3 1 USER LEVEL ERROR INDICATION 6 2 6 3 2 TECHNICIAN...

Страница 6: ...ng resolution Simplex mode Main scan 100 800 dpi in 1 dpi steps Sub scan 100 800 dpi in 1 dpi steps Duplex mode Main scan 100 600 dpi in 100 dpi steps Sub scan 100 600 dpi in 100 dpi steps Grayscales...

Страница 7: ...talled Dimensions W x D x H 470 x 677 x 278 mm 18 5 x 26 7 x 10 9 1 1 2 ENDORSER Number of printable characters 19 characters max Character set 43 characters 0123456789 AB Z Character size 1 6 W x 2 8...

Страница 8: ...sure cover Covers the scanner and closes the ADF exposure cover interlock switch Also contains an exposure glass 3 Scale Used for positioning a document when placing it on the exposure glass 4 Scanner...

Страница 9: ...anning Duplex model only Interface for the video signal during reverse side scanning 10 SCSI connectors For connecting the SCSI cables 11 SCSI ID rotary switch Used to select the SCSI ID and to select...

Страница 10: ...o properly align the documents placed in the input tray 17 Exit table Receives documents fed by the ADF after scanning 18 Exit table extension This holds the documents output from the ADF it can be ex...

Страница 11: ...ond scanner Moves to keep the distance between the exposure lamp and the CCD constant and sends light reflected from the 1st scanner to the CCD 3 Scanner drive wires Transmit motor power to the 1st an...

Страница 12: ...ation roller Stops the lower pages of the original while allowing the top one to pass 11 White roller Duplex model only Allows the machine to correct for variations in the white level of the CIS 12 Fe...

Страница 13: ...nd outputs a video signal to the SCU 5 Scanner Motor Drives the scanners 6 SOP This contains the scanner indicator lamps 7 PSU Provides dc voltages to the system 8 IOB Controls the mechanical parts of...

Страница 14: ...n the reverse side of the original 18 EDU Option Controls the mechanical parts of the endorser 19 Endorser solenoid Option Moves the paper holding plate to hold the original at the endorser s printing...

Страница 15: ...DF or the document feeder cover closed ADF open error Is any one of the feed read or feed out sensors on Paper jam Is there any paper on the document table Is the document table working properly Docum...

Страница 16: ...djust them to the specified levels the CPU determines that a lamp error has occurred 8 If the black level or the white level cannot be adjusted properly during the above initialization process the sca...

Страница 17: ...s C The 1st scanner D consists of the exposure lamp a reflector E and the 1st mirror F The exposure lamp is energized by an ac supply to avoid uneven light intensity while the 1st scanner moves in the...

Страница 18: ...2nd scanners B C through the timing belt D scanner drive pulley E scanner drive shaft F and two scanner wires G The IOB board drives the scanner drive motor The scanning speed depends on the scanning...

Страница 19: ...cover to perform the shading function Image Scanning The scanner starts to scan the image area at the designated position B The scanner stops after scanning the designated image area C The arrows indi...

Страница 20: ...irection Document Length The scanner detects the document size only in the main scan direction and the scanner driver determines that the document length is the same as for a standard paper size of th...

Страница 21: ...e feed sensor F detects whether the original has reached the transport drum or not Then the original turns with the transport drum through the read sensor H While the original passes over the ADF scan...

Страница 22: ...anner K will stop immediately If an ADF cover open error or memory error is detected the scanner will stop after returning to the home position The first carriage moves to the ADF scanning position J...

Страница 23: ...flat part of the spring I that is loosely attached to the bend in the lift shaft pushes up the document table see the next page for a diagram When the top of the document stack is pushed up against t...

Страница 24: ...shes the document table upwards so that the top of the stack is always against the pick up roller When all pages of the original have been fed out of the ADF the document table lift clutch and paper f...

Страница 25: ...ges of the original the separation roller C and the feed roller D separate these pages the separation mechanism is friction based When the leading edge of the original activates the feed sensor E the...

Страница 26: ...inal width The edge of the document is detected by the difference between the level of the document data and the background level which is provided by the black bracket located over the ADF exposure c...

Страница 27: ...mand in ADF mode it detects the document size in the main scan direction as described on the previous page The scanner sends the width data to the host computer Abort and Unload Commands These can occ...

Страница 28: ...000 210 205 44 24 64 L x 0 011 x 200 400 dpi Within 3 000 210 205 88 172 04 L x 0 011 x 400 L Document length mm Paper Feed Motor Pick up Clutch Document Table Lift Clutch Document Table Position Sen...

Страница 29: ...after the read sensor was activated J4 The trailing edge of the original does not pass through the feed sensor within the time required for feeding the maximum original length 2 m 60 mm after the feed...

Страница 30: ...ssing Unit IC on the SCU does the image processing then the image data goes to the computer through the Memory Control IC and the SCSI controller The CIS Contact Image Sensor unit in the duplex model...

Страница 31: ...1 Z C Zero Clamp Adjusts the black level reference for even pixels to mach the odd pixels 2 Signal Amplification Operational amplifiers in the AGC Auto Gain Control circuit amplify the analog signal...

Страница 32: ...o shading 2 Magnification 3 Mirror processing 4 Filtering MTF and smoothing 5 gamma correction 6 Grayscale processing 7 Binary picture processing 8 Error diffusion 9 Dithering 10 White black conversio...

Страница 33: ...uction and enlargement in the sub scan direction are done by changing the scanner motor speed or paper transport motor speed in the ADF However reduction and enlargement in the main scan direction are...

Страница 34: ...reduces the difference in contrast between light and dark areas of a halftone image Each pixel is corrected using the difference between it and the surrounding pixels The corrected pixels are then com...

Страница 35: ...it area scans the reverse side of the document The front side of the document is scanned first Then the document goes to the reverse side scanning area The white roller B pushes the document against t...

Страница 36: ...get a continuous scan across the page the CCDs have to overlap However as a result a continuous line cannot be scanned across the page at the same time Data is held in memory and combined later In boo...

Страница 37: ...IPU on the RCU board The RCU board contains the IPU and memory controller ICs for image processing The image processing in the IPU is the same as for the IPU in the SCU except for the shading correct...

Страница 38: ...rates in the normal ADF mode 3 The paper transport motor stops at a certain time after the leading edge of the paper passes through the feed out sensor 4 The endorser motor turns on 5 The endorser sol...

Страница 39: ...cter belt C hammer unit D and ink roller E The endorser motor drives the character belt and hammer unit and operates the hammer F The clutch controls the print timing The ink roller always contacts th...

Страница 40: ...e scanner enters low power mode the PSU cuts the 24 V 12 V 12 V and 5 Vs supplies and continues to supply 5VE only As a result the scanner consumes less than 12 W The operation panel indicates that th...

Страница 41: ...ONS 2 8 1 BOARD STRUCTURE For the main function of each PCB refer to the Electrical Component Layout section H P Sensor Lamp Stabilizer Operation Panel Cooling Fan Scanner Motor SBU Exposure Lamp Clut...

Страница 42: ...memory DRAM 32 Mbytes x 2 Address control when recalling the data from the memory SCSI controller SCSI interface controller SRAM Work area 32 kbytes EPROM Contains the program Enhanced I O EIO Extens...

Страница 43: ...ch as drive and rotation direction and drive current for the scanner motor come from the SCU Also the control signal for the exposure lamp comes from the SCU The image signals from the SBU go through...

Страница 44: ...he SCU generates the control signals for each electrical component and the endorser then these are sent to the ADU through the IOB The drivers on the ADU convert the control signals into drive pulses...

Страница 45: ...Do not expose the scanner to dusty or corrosive atmospheric conditions Ensure that the area in which the scanner is used is well ventilated 30 m3 hr person Make sure that the surface on which you plac...

Страница 46: ...is firmly inserted in the outlet 3 Avoid multi wiring 1 Input voltage level 102 to 138 V ac 45 to 65 Hz 187 to 276 V ac 45 to 65 Hz 2 Permissible voltage fluctuation 10 3 2 SCANNER INSTALLATION Please...

Страница 47: ...LLATION 3 4 1 ACCESSORY CHECK Check the quantity and condition of the accessories in the box against the following list Description Q ty 1 Endorser Unit 1 2 Solenoid Ass y 1 3 EDU Board 1 4 Harness 1...

Страница 48: ...t cover C 1 screw and the endorser cover D NOTE Remove the right cover by carefully lifting it from the rear 2 Install the spacer E and the EDU board F 2 screws 3 Route the cable G as shown NOTE Ensur...

Страница 49: ...own 3 screws 5 Install the clamp J and connect the three cables K to the EDU board L 6 Install the core M 7 Open the platen cover Install the endorser unit N as shown 1 connector 8 Attach the decal O...

Страница 50: ...ng it from the rear 2 Remove the solenoid assembly screw E from the hole F and replace it in hole G Do not tighten the screw yet 3 Loosen the screw H and adjust the height of the bracket I NOTE To red...

Страница 51: ...STALLATION 3 7 Installation 3 5 RED LAMP UNIT INSTALLATION 3 5 1 ACCESSORY CHECK Check the quantity and condition of the accessories in the box against the following list Description Q ty 1 Exposure L...

Страница 52: ...RED LAMP UNIT INSTALLATION 22 December 1998 3 8 3 5 2 INSTALLATION PROCEDURE 1 Remove the rear cover A 3 screws 2 Remove the stopper brackets B 3 Remove the pins C G514I500 WMF G514I510 WMF A B C B...

Страница 53: ...platen cover and remove the lamp cover D 2 screws 5 Remove the exposure lamp E 1 screw 6 Install the red lamp 1 screw 1 connector in the place of the exposure lamp 7 Reinstall the lamp cover the pins...

Страница 54: ...nner are carried out using dip switches 5 to 8 Within each test mode tests are selected by turning the SCSI ID rotary switch and the machine s condition is indicated by the four LEDs on the covers Not...

Страница 55: ...500 k sheets 1 2 3 4 6 7 5 8 ON Endorser character counter indication The number of endorser characters is indicated in the same way as above 1 2 3 4 6 7 5 8 O N Counter reset mode After the dip switc...

Страница 56: ...n motor on off 7 Not used 8 Not used 9 Not used 1 When the Start button is pressed to start the test the component turns on and off repeatedly Table C Sensor Test Mode SCSI ID Rotary Switch No Content...

Страница 57: ...LEDs Error Items Power On Green Machine Busy Green Document in Place Green Error Red SCU error Blinking Blinking RCU error Blinking On Blinking IPU error Blinking On Blinking Home position error Blin...

Страница 58: ...on LED off Use the rotary switch to select a digit of the counter The value of the selected digit is indicated by a combination of the four LEDs For the LEDs ON represents a 1 and OFF represents a 0...

Страница 59: ...4 2 2 TEST POINTS ADU Number Monitored Signal TP301 24 V TP302 12 V TP303 12 V TP304 COM TP305 5VE TP308 5VS TP309 COM 4 3 SPECIAL TOOLS Part Number Part Name A0069104 Scanner Positioning Pin 4 pcs s...

Страница 60: ...e main switch and disconnect the power cord and interface cable s for safety 5 1 COVERS 5 1 1 ADF EXTERIOR 1 Open the ADF cover A 2 Remove the ADF upper cover B 2 screws 3 Remove the ADF right cover C...

Страница 61: ...nd ADF right cover see ADF Exterior 2 Remove the rear cover see Scanner Exterior Operation Panel 3 Open the platen cover vertically see Exposure Glass 4 Remove the spring A 5 Remove the pin B 1 screw...

Страница 62: ...1 3 SCANNER EXTERIOR OPERATION PANEL 1 Remove the operation panel A 1 screw 2 Remove the front cover B 3 screws 3 Remove the left cover C 2 screws 4 Remove the right cover D 2 screws 5 Remove the rear...

Страница 63: ...SENSOR 1 Remove the ADF upper cover see ADF Exterior 2 Remove the document sensor A 1 connector 2 screws 5 2 2 SEPARATION UNIT 1 Remove the ADF upper ADF left and ADF right cover see ADF Exterior 2 Re...

Страница 64: ...ation unit See Separation Unit 2 Remove the document table assembly A 3 screws 5 2 4 CIS 1 Remove the document table assembly See Document Table Assembly 2 Remove the stopper bracket A 1 screw 3 Remov...

Страница 65: ...Remove the ADF upper ADF left and ADF right cover See ADF Exterior 2 Remove the scanning guide plate A 2 screws 5 2 6 FEED SENSOR 1 Open the ADF cover A 2 Remove the feed cover B 2 screws 3 Remove the...

Страница 66: ...7 READ SENSOR 1 Remove the rear cover See Scanner Exterior Operation Panel 2 Remove the read sensor A 1 connector 1 screw 5 2 8 FEED OUT SENSOR 1 Remove the feed out cover A 2 screws 2 Remove the fee...

Страница 67: ...r Transport Motor 4 Remove the paper transport motor see ADU Paper Transport Motor 5 Remove the registration guide plate A 1 connector 2 screws 6 Remove the rear cover see Scanner Exterior Operation P...

Страница 68: ...SIDE 5 3 1 PAPER FEED MOTOR 1 Remove the ADF upper and ADF right cover see ADF Exterior 2 Remove the paper feed motor A 1 connector 3 screws 5 3 2 EDU 1 Remove the ADF upper and ADF right cover see AD...

Страница 69: ...emove the ADF upper and ADF right cover see ADF Exterior 2 Remove the endorser solenoid A 1 connector 3 screws 5 3 4 RELAY SENSOR 1 Remove the ADF upper and ADF right cover see ADF Exterior 2 Remove t...

Страница 70: ...pper and ADF left cover see ADF Exterior 2 Remove the ADU A 10 connectors 3 screws 3 Remove the paper transport motor B 1 connector 3 screws 5 4 2 DOCUMENT TABLE POSITION SENSOR 1 Remove the ADF upper...

Страница 71: ...LUTCH DOCUMENT TABLE LIFT CLUTCH 1 Remove the ADF upper and ADF left cover see ADF Exterior 2 Remove the stopper bracket A 2 screws 3 Remove the pick up clutch B 1 connector 4 Remove the document tabl...

Страница 72: ...Remove the rear cover See Scanner Exterior Operation Panel 2 Remove the stopper brackets A 2 screws 3 Remove the pins B 4 Open the platen cover vertically 5 Remove the lamp cover C 2 screws 6 Remove...

Страница 73: ...December 1998 5 14 5 5 2 EXPOSURE LAMP 1 Remove the exposure glass see Exposure Glass 2 Slide the 1st scanner to the cutout A in the right frame 3 Remove the exposure lamp B 1 connector 1 screw G411R5...

Страница 74: ...ect the flexible cable B 4 Remove the SBU C 4 screws 5 Remove the lamp stabilizer D 2 connectors 6 Remove the operation panel see Scanner Exterior Operation Panel 7 Remove the front cover see Scanner...

Страница 75: ...98 5 16 5 5 4 IOB 1 Remove the exposure glass see Exposure Glass 2 Remove the lens cover see SBU Lamp Stabilizer Scanner Motor PSU 3 Remove the PCB cover A 6 screws 4 Remove the IOB B 5 connectors 4 s...

Страница 76: ...operation panel and the front cover see Scanner Exterior Operation Panel 2 Remove the SOP 1 connector 5 5 6 HOME POSITION SENSOR 1 Remove the right cover see Scanner Exterior Operation Panel 2 Remove...

Страница 77: ...SCANNER 22 December 1998 5 18 5 5 7 ADF INTERLOCK SWITCH 1 Remove the rear cover see Scanner Exterior Operation Panel 2 Remove the ADF interlock switch A 1 connector 1 screw G411R531 WMF A...

Страница 78: ...Exposure Glass 2 Remove the stopper brackets A 1 screw each 3 Remove the ADF B 4 connectors 4 screws 4 Remove the operation panel front cover right cover and left cover see Scanner Exterior Operation...

Страница 79: ......

Страница 80: ...itioning tools P N A0069104 G 19 Secure the 1st scanner with the scanner wire bracket H 1 screw each 20 Remove the positioning tools After sliding the scanner to the front and back several times set t...

Страница 81: ...er 1998 5 22 5 6 PCB 5 6 1 SCU RCU IPU 1 Remove the SCU assembly A 2 screws 2 Remove the RCU B 3 screws 3 Remove the IPU C 1 screw NOTE When replacing the SCU put the old ROM IC31 on the new SCU G411R...

Страница 82: ...diagnostics check the following items at power up 1 The ADF or ADF cover is not closed properly 2 An original is jammed in the ADF 3 There is a problem with the operation of the document table 4 Memor...

Страница 83: ...mode Yes On Off Blinking Off No On On Off Off Scanning Normal mode Yes On On On Off ADF cover switch open On Off Off On Document jam On Off Blinking On Document misfeed On Off On On Document table er...

Страница 84: ...el error conditions 6 4 1 USER VISIBLE ERROR CONDITIONS ADF Interlock Switch Open Symptom The problem cannot be solved with the procedures in the user s manual Possible Causes Defective ADF interlock...

Страница 85: ...Settings Are all the sensors OK Yes No Is the cable damaged Yes No Replace the sensor Replace the cable Does the jam always happen at the same position Yes No Are the 24 volt lines from the PSU to th...

Страница 86: ...utch Defective ADU Defective SCU Defective feed sensor Procedure Does the pick up roller mechanism work Yes No Is 24 volts supplied to the pick up clutch Yes No Is the cable damaged Yes No Replace the...

Страница 87: ...r Yes No Is the cable damaged Yes No Replace the ADU If the 24 volts from the PSU is defective another error will be generated Replace the cable Replace the motor if it has a defective Does the docume...

Страница 88: ...nnot be solved with the procedures in the user s manual Possible Causes Defective endorser unit Defective EDU Procedure Is the endorser unit is broken Yes No Is the cable between the EDU and the endor...

Страница 89: ...following errors can be detected with the self diagnostics using the dip switches See Service Level Functions Dip Switch Settings Memory Error Symptom This error occurs in the following conditions SRA...

Страница 90: ...me to the lamp stabilizer Yes No Is the cable damaged Yes No Replace the PSU Replace the cable Replace the exposure lamp Does the exposure lamp light Yes No Replace the lamp stabilizer Go to the next...

Страница 91: ...ve CIS unit Defective ADU Defective RCU Defective SCU Procedure Does the LED array light YES No Does 15 volts come to the CIS unit Yes No Is the cable damaged Yes No Replace the ADU Replace the cable...

Страница 92: ...xposure lamp Dirty white plate Procedure Is there any problem with the exposure lamp Yes No Is the white plate dirty Yes No Are all the mirrors installed properly Yes No Reseat the mirror Does the SBU...

Страница 93: ...ome position sensor and the IOB Procedure Does the home position sensor work Check it with sensor test mode See See Service Level Functions Dip Switch Settings Yes No Does 5 volts reach the sensor Yes...

Страница 94: ...se Defective SCU Procedure Replace the SCU RCU Error Symptom 3 3 volts generated on the RCU failed during scanning Possible Cause Defective RCU Procedure Replace the RCU Optional IPU Error Symptom 3 3...

Страница 95: ...em error 5 CN209 6 CN211 On Off Off On ADF interlock switch open 7 CN208 8 CN206 Blinking Blinking Blinking Blinking System error 9 Not used Not used Not used Not used 10 CN202 Blinking Blinking Blink...

Страница 96: ...Off Off 9 CN309 On Off Off Off 10 CN304 On Off Blinking Blinking Document table error 11 On Off Blinking Blinking Document table error 12 On Off Off Off 13 On Off On Off 14 On Off Blinking Blinking Do...

Страница 97: ...250 V No response FU31 4 A 125 V Exposure lamp error Home position error White level error FU32 4 A 125 V Document table working error Document jam FU33 5 A 125 V No response FU35 5 A 125 V Exposure l...

Страница 98: ...and converts the scanned image to binary data Auto Photo Letter This function automatically identifies the text portions of an original and the photographic portions and scans each in a suitable scan...

Страница 99: ...y areas are common By using these characteristics the original image is separated into text and photo areas Section Area The original image is separated into specified areas Each area is processed usi...

Страница 100: ...GND 5 Document Sensor 5VE GND 5 Feed Sensor 5VS GND 5 Read Sensor 5VS 24 Document Table Lift Clutch 24VADU 24 Pick up Clutch 24VADU s t s s s t t 24 Endorser Solenoid 24ADU TMDN RESET GND SD SET 6V M...

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