Ricoh A497 Service Manual Download

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ELECTRICAL COMPONENT LAY OUT

  1. Original Set Sensor
  2. Registration Sensor
  3. Pulse Generator Sensor
  4. Original Width Sensor

  5. Pick-up Solenoid
  6. Belt Drive Motor
  7. Indicator Panel
  8. DF Position Sensor

9. DF Main Board
10. Inverter Solenoid
11. Feed-out Motor
12. Feed-out Sensor

13. Original Select Switch
14. Lift Switch
15. Feed-in Clutch

ARDF

12 February 1992

ELECTRICAL COMPONENT LAY OUT

Summary of Contents for A497

Page 1: ...AUTO REVERSE DOCUMENT FEEDER Machine Code A497 ...

Page 2: ...ity Max 50 sheets A4 81 2 x 11 52 g m2 14lb Original Separation Feed and Friction Belts Original Transport One flat belt Original Stop System Dc servo motor control system Copying Speed FT5233 Continuous copy 33 copies minute A4 81 2 x 11 sideways Single copy 31 copies minute A4 81 2 x 11 sideways Power Source 24V from copier 1 8A Power Consumption 45W Dimensions W x D x H 670 x 468 x 120 mm 26 4 ...

Page 3: ...ets ARDF ADF SADF 25 sheets ADF SADF only A4S A4L A5S A5L B4L B5S B5L B6L B6S 50 sheets ADF SADF only 30 sheets ADF SADF only 51 2 x 81 2 S 11 x 17 L 50 sheets ARDF ADF SADF 30 sheets ARDF ADF SADF 81 2 x 14 L 81 2 x 11 S 81 2 x 11 L 51 2 x 81 2 L L means lengthwise S means sideways SIZE WEIGHT SPECIFICATIONS 10 July 1992 2 ...

Page 4: ...Pulse Generator Disk 2 Friction Belt 3 Pick up Lever 4 Original Table 5 Exit Roller 6 Inverter Pawl 7 Inverter Roller 8 Transport Belt 9 Pick up Roller 10 Feed Roller 1 2 3 4 5 6 7 8 9 10 MECHANICAL COMPONENT LAYOUT 12 February 1992 2 ...

Page 5: ... 3 Pulse Generator Sensor 4 Original Width Sensor 5 Pick up Solenoid 6 Belt Drive Motor 7 Indicator Panel 8 DF Position Sensor 9 DF Main Board 10 Inverter Solenoid 11 Feed out Motor 12 Feed out Sensor 13 Original Select Switch 14 Lift Switch 15 Feed in Clutch ARDF 12 February 1992 ELECTRICAL COMPONENT LAY OUT 3 ...

Page 6: ...AME FUNCTION LOCATION Pick up Solenoid Energizes to press the pick up lever against the stack of originals in preparation for original feed in 5 Inverter Solenoid Energizes to invert the original when copying two sided originals 10 SWITCHES NAME FUNCTION LOCATION Lift Switch Informs the CPU when the DF is lifted and also serves as the jam reset switch for the DF 14 Original Select Switch Selects t...

Page 7: ...so that APS sensor can begin checking the original size 8 Pulse Generator Sensor Generates pulses used to measure the original length 3 Feed out Sensor Checks for original misfeeds and sets original stop timing when in auto reverse mode 12 MAGNETIC CLUTCH NAME FUNCTION LOCATION Feed in Clutch Energizes to rotate the feed roller pull out rollers and relay roller 15 PRINTED CIRCUIT BOARDS NAME FUNCT...

Page 8: ... position the main system s CPU sends the feed out and the feed in signals to the DF CPU in order to exchange the original with the next original When the scanner comes to the return position after scanning the last original the main system s CPU only sends the feed out signal in order to feed out the last original 2 Two sided Original Feed Unlike one sided original feed the back side of the origi...

Page 9: ...copying 3 Semi automatic Document Feed If a single original is inserted into the original table and copied the DF shifts to the semi automatic feed mode and lights the Auto Feed indicator The Auto Feed indicator remains on for four seconds after the main system s main motor stops If another original is inserted within that four second period it is automatically fed and copied ARDF 12 February 1992...

Page 10: ... out of the sensor The DF then sends the original set signal to the main system s CPU to inform it that the DF will be used When the Start key is pressed the pick up solenoid B is energized The original stack is then pressed between the pick up lever C and pick up roller D The rotation of the pick up roller advances the bottom original D B C A ORIGINAL FEED 12 February 1992 8 ...

Page 11: ...starts when the feed roller starts turning and advances the bottom original of the stack The feed roller moves the original past the friction belt because the driving force of the feed roller is greater than the resistance of the friction belt The friction belt prevents multiple feeds because the resistance of the friction belt is greater than the friction between original sheets B A C A B ARDF 12...

Page 12: ...liseconds after the Start key is pressed Then 100 milliseconds after the solenoid is energized the belt drive motor starts turning The pulse generator disc F on the pull out roller shaft always turns when the belt drive motor is on in the forward direction 238 encoder pulses of the belt drive motor after the original s trailing edge passes the registration sensor the relay rollers and the transpor...

Page 13: ... length is calculated by counting the number of pulses from the pulse generator C while the registration sensor is on The original width sensor is turned on when the original width is 204 mm 8 or more It is in the same position front to back as the original width sensor in the copier Original size detection is necessary for APS AMS and the feed in feed out timing of the DF C B A ARDF 12 February 1...

Page 14: ...pulses Exact timing depends on registration adjustment Thin original mode is selected at the factory 2 Thick Original Mode When the thick original mode is selected the original is aligned against the original scale For the first side the belt drive motor stays on 36 encoder pulses longer than when in the thin original mode and then reverses for 62 encoder pulses This forces the original against th...

Page 15: ... the feed in unit passing over the DF registration sensor A At the same time the feed out motor B starts turning The inverter solenoid C turns on 100 milliseconds after the original s trailing edge passes the registration sensor When the inverter solenoid turns on the inverter pawls D rotate counterclockwise D C B D A ARDF 12 February 1992 ORIGINAL FEED 13 ...

Page 16: ...inal scale the belt drive motor stops At the same time the feed out motor and the inverter solenoid turn off 4 After the reverse side of the original is exposed the belt drive motor the feed out motor and the inverter solenoid turn on and the original is fed into the inverter section This is the same as step 2 above 5 The original is fed onto the exposure glass again as in step 3 above The front s...

Page 17: ...e original to the inverter rollers C and the exit rollers take over the original feed out When the original s trailing edge passes the feed out sensor D the feed out motor drops to half of its normal speed for 350 milliseconds and then stops The lower speed prevents uneven stacking of originals For A3 or double letter size originals the feed out motor speed does not change due to the length of the...

Page 18: ... circuit which sends the motor drive pulses An encoder in the servomotor has two magnetic sensors that generate two pulse signals phase A and B The driver IC monitors the belt speed and direc tion by these pulse signals and uses this data to regulate the motor s speed Speed Driver Driver CN103 1 PWM ON OFF DF Main Board Circuit CPU IC Data Phase A Phase B 5V CN103 2 CN103 3 CN103 4 CN102 1 CN102 2...

Page 19: ...ut motor The frequency generator of the feed out motor makes a very low voltage ac cur rent which is fed back to the driver IC The driver IC monitors the frequency of this ac current and based on the frequency it regulates the motor speed DF Main Board CPU CN104 A2 High Low Regulation Feed out Motor FG Driver Drive Circuit IC ON OFF AC Feedback CN104 A15 Voltage CN104 B8 CN104 A12 Motor 30 Novembe...

Page 20: ...he document feeder is closed The main system then shifts to the document feeder mode The lift switch also serves as the reset switch for document feeder misfeeds When a book or thick original maximum thickness 60 mm is copied the DF acts as a cover for the original as shown in the figure E The lift switch is turned off during this condition so the DF does not function The tension of spring F retur...

Page 21: ...after the belt drive motor starts turning the Original Misfeed indicator lights ON check If the registration sensor does not turn off within 780 milliseconds the CPU determines that there has been an original misfeed OFF check The Original Misfeed indicator also lights if the feed out sensor is not actuated within 780 milliseconds after the belt drive motor starts turning forward ON check or if th...

Page 22: ...t actuated within 780 milliseconds after the registration sensor turns off the Original Misfeed indicator lights ON check The Original Misfeed indicator also lights if the feed out sensor does not turn off within 780 milliseconds after the feed out sensor turns on OFF check The feed out ON OFF check is same as for one sided originals Registration OFF check 780 ms ON check 780 ms Feed out Belt Driv...

Page 23: ...ng Bracket 2 4 Panhead Screw 4 x 14 1 5 Original Table 1 6 Angle Stopper 1 7 Spacer 0 5 mm 1 8 Spacer 0 2 mm 1 9 E plate 1 10 Lift Switch Actuator 1 11 Cover Size Actuator 1 12 Bushing 1 13 Toothed Washer 1 14 Ground Screw 1 15 Stud Screw 2 16 Plastic Clamp 1 17 Panhead Screw 4 x 6 5 18 Shoulder Screw 4 x 5 4 19 NECR 1 20 NECR Envelope U S A only 1 ARDF 12 February 1992 INSTALLATION 19 ...

Page 24: ...feeder DF make sure that the copier is unplugged 1 Remove the strip of tape A and the shipping retainer B 1 screw 2 Remove the two pan head screws C and replace them with flat shoulder screws D 3 Install the DF mounting bracket E 2 screws B A E C D INSTALLATION 12 February 1992 20 ...

Page 25: ...sure the clearance a between the DF mounting bracket and the E plate 2 Remove the DF mounting bracket and insert the spacers B 0 2 mm and 0 5 mm to adjust the clearance a to between 4 0 mm and 4 5 mm 3 After securing the mounting bracket reconfirm the clearance a A a B ARDF 12 February 1992 INSTALLATION 21 ...

Page 26: ... the pins A on the mounting bracket then slide the DF to the left as shown 6 Secure the DF to the DF mounting bracket B 4 screws with flat washer 7 Install the lift switch actuator C 1 screw M3 x 4 8 Install the sensor actuator D 2 screws A B C D INSTALLATION 12 February 1992 22 ...

Page 27: ...0 Swing out the main control board assembly B 1 screw 11 Remove the cover plate C from the top cover D with cutting pliers 12 Run the DF harness E through the bushing F and bracket hole G then secure the bushing A G F B E C C D ARDF 12 February 1992 INSTALLATION 23 ...

Page 28: ... clamp F 1 screw as shown 15 Secure the protective earth wire G 1 grounding screw and 1 toothed washer 16 Close and secure the main control board assembly NOTE Place the DF harness in front of the main control board as shown 17 Reinstall the rear cover H 18 Install the angle stopper I 2 screws and the original table J B F E D A G C J I H B A INSTALLATION 12 February 1992 24 ...

Page 29: ...eat the following procedure for each magnet catch 1 Loosen the screws securing the magnet catch B 2 screws 2 Close the document feeder and tighten the magnet catch screws when the rubber stopper C touches the exposure glass 21 Reinstall the grip cover A B C ARDF 12 February 1992 INSTALLATION 25 ...

Page 30: ...Make a copy of the test sheet in platen mode A4 81 2 x 11 sideways 2 Confirm that the original select switch is set to the thin original mode and make a copy in DF mode A4 81 2 x 11 sideways 3 Compare the registration of the copy in platen mode with that in the DF mode and confirm that the difference is within 2 5 mm 4 If the difference is more than 2 5 mm adjust VR102 C to change the original sto...

Page 31: ...1 Set DIP SW101 B on the main control board as follows ON 101 2 4 OFF 101 1 3 2 Set a sheet of A3 11 x 17 paper C on the DF then press SW 101 D to feed the paper into the DF belt section 3 When the paper stops on the exposure glass after the inversion open the DF slowly so that the paper does not move from the stop position 4 Confirm that the paper has stopped against the left scale B D A C ARDF 1...

Page 32: ...riginal from jamming at the edge of the exposure glass when it is fed in without the left scale 7 Set a sheet of A3 11 x 17 paper on the DF then press SW101 8 Just after the paper is fed in gently pull off the sheet set in step 6 9 When the paper set in step 7 stops on the exposure glass after the inversion open the DF slowly so that the paper does not move from the stop position A B INSTALLATION ...

Page 33: ...1 Set back DIP SW101 B on the main control board as follows ON 101 1 OFF 101 2 3 4 12 Reinstall the DF main control board cover C and the left scale 26 Check the operation of the DF 27 Set the original select switch to the thin paper mode normal position and explain the function of this switch to the customer a A B C VR 103 a 10 15 mm a 10 15 mm ARDF 12 February 1992 INSTALLATION 29 ...

Page 34: ...F make sure that the copier is unplugged 1 Remove the strip of tape A and the shipping retainer B 1 screw 2 Remove the two pan head screws C and replace then with flat shoulder screws D 3 Install the DF mounting bracket E 2 screws B A E C D 30 November 1990 7 24 ...

Page 35: ...A on the exposure glass as shown and measure the clearance a between the DF mounting bracket and the E plate 2 Remove the DF mounting bracket and insert the spacers B 0 2 mm and 0 5 mm to adjust the clearance a to between 4 0 mm and 4 5mm A a B 30 November 1990 7 25 ...

Page 36: ...ket then slide the DF to the left as shown 6 Secure the DF to the DF mounting bracket B 4 shoulder screws 7 Remove the 2 pan head screws then install the 2 stud screws C as shown in the figure 8 Install the lift switch actuator D 1 screw 9 Install the sensor actuator E 2 screws A B C D E 30 November 1990 7 26 ...

Page 37: ...p cover A 2 screws 11 Remove the harness bracket cover plate B 1 screw Then remove harness bracket C 1 screw 12 Feed the harness D through the bushing E and the bracket hole then secure the bushing A B C D E 30 November 1990 7 27 ...

Page 38: ...tall the harness bracket 14 Secure the grounding wire B 1 grounding screw 1 toothed washer 15 Set the DF harness as follows 1 Fiber optic cable CN113 main PCB C 2 4P connector 4P connector copier 16 Reinstall the harness bracket D 1 screw B A C D 30 November 1990 7 28 ...

Page 39: ...on each side Repeat the following procedure for each magnet catch 1 Remove the grip cover C 2 screws 2 Loosen the screws securing the magnet catch D 2 screws 3 Close the document feeder and tighten the magnet catch screws when the rubber stopper E contacts the exposure glass 20 Reinstall the grip cover 2 screws A B C D E 30 November 1990 7 29 ...

Page 40: ...de A4 81 2 x 11 sideways 2 Confirm that the original select switch is set to thin original mode and make a copy in DF mode A4 81 2 x 11 sideways 3 Compare the registration of the copy in platen mode with that of the DF mode and confirm that the difference is within 2 5 mm 4 If the difference is more than 2 5 mm adjust VR102 to change the original stop timing NOTE Turning VR102 clockwise results in...

Page 41: ...ithin 2 0 mm 7 If the difference is more than 2 0 mm adjust VR103 to change the original stop timing NOTE a The test sheet should stop pressed against the left scale in DF two sided original mode b Turning VR103 clockwise results in the original stopping later 24 Check the operation of the DF 25 Set the original select switch to thin paper mode normal position and explain the function of this swit...

Page 42: ...he inner cover B 2 screws hinge C 1 stud screw and 3 screws and switch cover D 1 screw and 1 connector 3 Open the paper feed unit E Then remove the transport belt unit F 5 screws 4 Remove the 2 springs then remove the transport belt G NOTE The DF belt has to be installed in the notch H as shown C B F D E A H G REPLACEMENT AND ADJUSTMENT 12 February 1992 30 ...

Page 43: ...MOVAL 1 Remove the transfer belt unit See Transfer Belt Removal steps 1 3 2 Remove the motor cover A 3 screws 3 Remove the paper feed unit B 6 screws and 8 connectors A B ARDF 12 February 1992 REPLACEMENT AND ADJUSTMENT 31 ...

Page 44: ...move the paper feed unit See Paper Feed unit Removal 2 Remove the paper feed guide A 2 screws 3 Remove the document set sensor assembly B 1 screw and 1 connector then remove the sensor 1 screw A B REPLACEMENT AND ADJUSTMENT 12 February 1992 32 ...

Page 45: ...ove the document set sensor assembly A Refer to the Document Set Sensor Replacement 2 Remove the bushing B 1 E ring and a gear C 1 E ring then remove the pick up roller D 1 E ring D B C A ARDF 12 February 1992 REPLACEMENT AND ADJUSTMENT 33 ...

Page 46: ...to the Document Set Sensor Replacement 2 Remove the reinforcement bracket B 4 screws 3 Remove the paper feed clutch stopper C 1 E ring 4 Open the harness clamp D then remove the paper feed clutch axis E 2 E rings and 2 bushings D C B E A REPLACEMENT AND ADJUSTMENT 12 February 1992 34 ...

Page 47: ... feed clutch A Refer to the Paper Feed Clutch Replacement 2 Remove the registration sensor and size sensor assembly B 2 screws 2 connectors 3 Remove the registration sensor C 1 screw and the size sensor D 1 screw A D B C ARDF 12 February 1992 REPLACEMENT AND ADJUSTMENT 35 ...

Page 48: ... Feed Unit Removal 2 Remove the plastic clamp A 1 screw and disconnect the 2P and the 4P connector 3 Remove the motor assembly B 3 screws and 1 E ring 4 Remove the gear C 2 Allen screws then remove the motor D 4 screws B C D A REPLACEMENT AND ADJUSTMENT 12 February 1992 36 ...

Page 49: ...oid bar D 2 If the gap is not within specifications 0 1 to 0 6 mm perform the following step 3 While pushing the solenoid bar D loosen the pick up solenoid bracket 2 screws E and secure them so that the gap A is within specifications A D C B C B E Adjustment Standard 0 1 0 6 mm ARDF 12 February 1992 REPLACEMENT AND ADJUSTMENT 37 ...

Page 50: ...plastic clamp B 1 screw and a E ring C Then remove the paper feed motor assembly D 3 screws 3 Remove 2 sets of E rings and bearings E Then remove the roller shaft F NOTE Be careful not to loose pins G 4 Remove the feed rollers H 2 pull out rollers I 1 side roller J and 4 E rings H G I J D E C A E F B REPLACEMENT AND ADJUSTMENT 12 February 1992 38 ...

Page 51: ...BELT REPLACEMENT 1 Remove the friction belt assembly A 1 screw 2 Remove the friction belt B 2 springs and 1 pin C NOTE Do not touch the friction belt surface A B C C ARDF 12 February 1992 REPLACEMENT AND ADJUSTMENT 39 ...

Page 52: ...10 11 FEED OUT UNIT REMOVAL 1 Remove the motor cover A 4 screws 2 Disconnect the 3 connectors B 3 Remove the feed out unit 5 screws A B REPLACEMENT AND ADJUSTMENT 12 February 1992 40 ...

Page 53: ...LACEMENT 1 Remove the feed out unit Refer to Feed Out Unit Removal 2 Remove the feed out sensor assembly A 1 screw and 1 connector 3 Replace the feed out sensor B 1 screw A B ARDF 12 February 1992 REPLACEMENT AND ADJUSTMENT 41 ...

Page 54: ...w and 2 springs B 3 Remove the inverter motor assembly C 3 screws and 1 E ring and the timing belt D NOTE Be careful not to lose pin E 4 Remove the bushing F 1 E ring inverter roller sprocket G 1 E ring and bushing H 5 Replace the inverter roller and the inverter roller shaft A B B C D F G H E REPLACEMENT AND ADJUSTMENT 12 February 1992 42 ...

Page 55: ...wn the inverter solenoid bar A to measure the gap B 3 If the gap is not within specifications take the following steps 4 Loosen the solenoid bracket screw B 5 Adjust the gap by sliding the inverter solenoid assembly A B Adjustment Standard 1 5 0 5 mm B ARDF 12 February 1992 REPLACEMENT AND ADJUSTMENT 43 ...

Page 56: ... Remove 3 screws to disconnect the optic fiber cable connector B 3 Disconnect the connectors C then remove the PCB as shown NOTE When removing the PCB be careful not to damage any of the components that protrude from the board B C A REPLACEMENT AND ADJUSTMENT 12 February 1992 44 ...

Page 57: ...in platen mode A4 81 2 x 11 sideways 3 Confirm that the original select switch is set to the thin original mode and make a copy in DF mode A4 81 2 x 11 sideways 4 Compare the registration of the copy in platen mode with that in the DF mode and confirm that the difference is within 2 5 mm 5 If the difference is more than 2 5 mm adjust VR102 C to change the original stop timing according to the abov...

Page 58: ...ain control board as follows ON 101 2 4 OFF 101 1 3 2 Set a sheet of A3 11 x 17 paper C on the DF then press SW 101 D to feed the paper into the DF belt section 3 When the paper stops on the exposure glass after the inversion open the DF slowly so that the paper does not move from the stop position 4 Confirm that the paper has stopped against the left scale B D A C REPLACEMENT AND ADJUSTMENT 12 Fe...

Page 59: ...rom jamming at the edge of the exposure glass when it is fed in without the left scale 7 Set a sheet of A3 11 x 17 paper on the DF then press SW101 8 Just after the paper is fed in gently pull off the sheet set in step 6 9 When the paper set in step 7 stops on the exposure glass after the inversion open the DF slowly so that the paper does not move from the stop position B A ARDF 12 February 1992 ...

Page 60: ...timing NOTE Turning VR103 clockwise results in the original stopping later 11 Set back DIP SW101 B on the main control board as follows ON 101 1 OFF 101 2 3 4 12 Reinstall the DF main control board cover C and the left scale a A B C VR 103 a 10 15 mm a 10 15 mm REPLACEMENT AND ADJUSTMENT 12 February 1992 48 ...

Page 61: ...it until the leading edge registration is within the specification NOTE Turning VR102 clockwise results in the original stopping later 5 Make a copy of the DF test chart in DF two sided original mode Insert the original face down 6 Compare the leading edge registration with that of the platen cover mode copy There should be no more than a 2 00 mm difference 7 If the leading edge registration is ou...

Page 62: ...witch on 3 If either the original set indicator C or the original feeding indicator D is on adjust the speed by turning VR 101 If the original set indicator is on turn VR 101 in the L direction If the original feeding indicator is on turn VR 101 in the H direction Adjust until both indicators stay off for at least 5 seconds B D C A ARDF 12 February 1992 REPLACEMENT AND ADJUSTMENT 49 ...

Page 63: ...e belt drive motor and the feed out motor are controlled by the DF CPU through their respective driver ICs Also the DF CPU communicates with the main system using a serial interface fi ber optics CPU ROM Sensors Switches Solenoids Indicators Belt Drive Motor Feed out Motor Driver IC Driver IC RXD TXD TXD RXD Copier Main PCB DF Main Board 30 November 1990 7 6 ...

Page 64: ...re it is stepped down and rectified to 24 volts Then this dc voltages is supplied to the DF main board The regulator IC on the DF main board further steps down the 24 volts to 12 volts and 5 volts Regulator IC Regulator IC DC Power Supply PCB CN101 1 CN101 2 CN2 13 CN2 10 VF GND 115V 220 240V Transformer Noise filter 12V 5V 24V DF Main Board 30 November 1990 7 9 ...

Page 65: ... mode or in the reduction mode If it is used together with the duplex mode 4 originals can be copied on a single sheet of paper automatically If odd numbered originals are placed on the original table the last original is placed on the exposure glass as shown in figure 2 Only 1 sided originals can be used and Auto Paper Select APS and Auto Reduce Enlarge modes cannot be used with this mode Fig 1 F...

Page 66: ...e 1 100 milliseconds after the registration sensor A detects the trailing edge of the first original the feed in clutch turns on again to feed the second original Figure 2 When the registration sensor detects the leading edge of the second original the feed in clutch turns off and the DF CPU starts counting the encoder pulses of the belt drive motor At the proper timing the belt drive motor turns ...

Page 67: ...iginals onto the exposure glass keeping the same distance between them At the proper timing after the trailing edge of the second original passes the registration sensor the belt drive motor stops to place the first and second originals on the exposure glass as shown There is no adjustment for the combine 2 original mode However when the lead edge registration is adjusted properly in the thin orig...

Page 68: ...otor and the feed out motor turn on to feed out the originals When the leading edge of the first original is detected by the feed out sensor C the feed in clutch turns on to start feeding the first original of the next cycle C Fig 5 COMBINE 2 ORIGINALS MODE 10 July 1992 6 ...

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