B408 Service Manual
Contents
1. 7 Harness G 8 Unhook the spring H 9 Turn the stapler unit I and take it out 10 Bracket J 2 x 2 H B408 2 SM 1 3 MOTORS 1 3 1 SHIFT MOTOR 1 Rear cover 1 1 2 Shift motor A x 2 EB x 1 1 3 2 STAPLER MOTOR 1 Rear cover r1 1 2 Stapler motor A 2 x 2 EB x 1 SM A MOTORS oc Sui B408 MOTORS 1 3 3 UPPER TRANSPORT MOTOR AND EXIT MOTOR Rear cover 1 1 Motor assembly A 2 x 4 E x 2 Upper transport motor B x 4 Exit motor C x 4 uM 1 3 4 LOWER TRANSPORT MOTOR 1 Main PCB 1 1 2 Lower transport motor A amp x 2 EB x 1 B408 4 SM MOTORS AND SENSORS 1 4 MOTORS AND SENSORS 1 4 1 PREPARATION 1 Front cover and inner cover 1 2 2 Upper side cover A 2 x 2 3 Upper tray B x 1 4 Lower side cover C 2 x 2 5 Loosen the 2 screws D 6 Lower the lower tray guide plate E 1000 Sheet Finisher 7 Guide plate x 4 SM 5 B408 MOTORS AND SENSORS 1 4 2 STACK HEIGHT SENSOR 1 Stack height sensor assembly A x 1 A 2 Stack height sensor B x 1 B 1 4 3 STAPLER TRAY PAPER SENSOR 1 Stapler tray paper sensor A EJ x 1 M A B408 6 SM MOTORS AND S2. Lot ica a otia 16 Upper Tray MOD o ene od auto qu Aie dtu Dale 16 titolo vedete bt 16 Staple MOG SSD 16 46 UPPER TRAV PR TP 17 4 7 LOWER TRAY UP DOWN 5 5 2 18 4 8 PAPER SHIFT MECHANISM une 19 4 9 JOGGER UNIT PAPER POSITIONING 20 4 10 EXIT GUDE PLATE Lassa AG 21 4 11 STAPLER MEGRHANISM 22 4 12 STAPLER UNIT MOVEMENT MECHANISM 23 4 13 PAPER FEED OUT MECHANISM sat 24 SM i B408 1000 SHEET FINISHER B408 TABLE OF CONTENTS MAIN PCB 1 REPLACEMENT AND ADJUSTMENT CAUTION Turn off the main power switch and unplug the machine before beginning any of the procedures in this section NOTE This manual uses the following symbols See or Refer to amp Screws Connector 09 Clip ring E ring 1 1 MAIN PCB Finisher v Rear cover x 2 2 Main PCB B 2 x 4 All EP SM 1 B408 STAPLER UNIT 1 2 STAPLER UNIT 1 Side cover A 2 x 2 2 Open exit guide plate B 3 Upper side cover C 2 x 2 4 Front cover support plate D 2 x 1 DER E 5 Front cover E Ae c 6 Front inner cover F 2 x 2
3. at the rear side first then at the front side Finisher o After the job is completed the stapler moves back to its home position The stapler HP sensor B detects this SM 23 B408 PAPER FEED OUT MECHANISM 4 13 PAPER FEED OUT MECHANISM After the copies have been stapled the stack feed out motor A starts The pawl B on the stack feed out belt C transports the set of stapled copies up and feeds it to the shift roller The shift roller takes over stack feed out after the leading edge reaches this roller Just before the stapled stack passes through the lower tray exit sensor the stack feed out motor turns off until the shift rollers have completely fed the stack out to the lower tray Then the stack feed out motor turns on again until the pawl B actuates the stack feed out belt home position sensor D B408 24 SM
4. paper the tray goes down until the sensor turns off again Then it goes up until the sensor is on again Staple Mode Tray Down After a stapled copy is fed out the tray goes up for 220 ms and stops for 300 ms Then it goes down for 1 second waits for 500 ms then goes up until the sensor turns on B408 18 SM PAPER SHIFT MECHANISM 4 8 PAPER SHIFT MECHANISM Finisher o In the sort stack mode the shift roller A moves from side to side to separate the sets of copies The horizontal position of the shift roller is controlled by the shift motor B and the shift gear disk C After the trailing edge of the copy passes the upper transport roller the shift motor turns on driving the shift gear disk and the link D After the paper is delivered to the lower tray E the shift roller moves to its home position which is detected by the shift HP sensor F Then when the trailing edge of the next copy passes the upper transport roller the shift roller shifts again This operation is done every sheet When the trailing edge of each page in the next set of copies passes the upper transport roller the shift roller shifts in the opposite direction SM 19 B408 JOGGER UNIT PAPER POSITIONING MECHANISM 4 9 JOGGER UNIT PAPER POSITIONING MECHANISM SN E In staple mode each sheet of copy paper is vertically and horizontally aligned when it arrives in
5. 1000 SHEET FINISHER B408 1000 SHEET FINISHER SR790 REVISION HISTORY Page Date Added Updated New fess 1 REPLACEMENT AND ADJUSTMENT 1 1 MAIN PO B da o C e X ER RES AR DCN Pruner o GN GNE Se S SQ 1 ta STAPLER UN ite quete tc e 2 13 LIP 3 STE MOTOR NE 3 15222 STAPLER MOTOR nde dadas eee edd kateter 3 1 3 3 UPPER TRANSPORT MOTOR AND EXIT MOTOR 4 1 3 4 LOWER TRANSPORT 200011 4 1 4 MOTORS AND SENSOIJS25 5 141 PREPARATION riot dete E e teo dti ti tto etes 5 1 4 2 STACK HEIGHT SENSOR actin mime 6 1453 STAPEERCTRAY PAPER SENSOR 6 1 4 4 LOWER TRAY MOTOR 7 1 4 5 STACK FEED OUT 7 2 TROUBLESHOOTING 8 21 JAM DE TEC TON c 8 9 SERVICE TABLES Lane 9 S DIPSSWITGH SETTINGS a ea 9 4 DETAILED DESCRIPTIONS 24 041111 10 GENERALFLAYOUT DES Iu ca bk mut Cute qe De cas INPS a nd 10 4 2 ELECTRICAL COMPONENT 0 11 4 3 ELECTRICAL COMPONENT 13 DRIVE LAYOUT iie oret 15 4 5 JUNG TON GATES trader icti rt ere
6. 3 Entrance Sensor 14 Stapler HP Sensor 4 Exit Guide Plate Motor 15 Stapler Tray Entrance Sensor 5 Exit Guide Plate HP Sensor 16 Stapler Tray Paper Sensor 6 Front Door Safety Switch 17 Stapler Hammer Motor 7 Stack Height Sensor 18 Staple Sheet Sensor 8 Lower Tray Exit Sensor 19 Stack Feed out Belt HP Sensor 9 Lower Tray Upper Limit Switch 20 Stapler Rotation HP Sensor 10 Shift HP Sensor 21 Staple Sensor 11 Shift Motor SM 11 B408 ELECTRICAL COMPONENT LAYOUT 27 23 22 Tray Junction Gate Solenoid 23 Lower Tray Lift Motor 24 Lower Tray Lower Limit Sensor 25 Stapler Motor 26 Jogger Fence Motor 27 Stack Feed out Motor 28 Main Board 29 Lower Transport Motor 30 Stapler Junction Gate Solenoid 31 Exit Motor 32 Upper Transport Motor B408 12 SM ELECTRICAL COMPONENT DESCRIPTION 4 3 ELECTRICAL COMPONENT DESCRIPTION Motors M1 Upper Drives the entrance roller and upper transport Transport rollers M2 Lower Drives the lower transport rollers and the Transport positioning roller M3 Jogger Fence Drives the jogger fences M4 Staple Hammer Drives the staple hammer M5 Stack Feed out Drives the stack feed out belt M6 Exit Guide Plate Opens and closes the exit gu
7. ENSORS 1 4 4 LOWER TRAY LIFT MOTOR 1 Lower tray lift motor A x 2 EB x 1 A 1 4 5 STACK FEED OUT MOTOR 1 Stack feed out motor A amp x 2 EB x 1 oc Su 5 7 B408 JAM DETECTION 2 TROUBLESHOOTING 2 1 JAM DETECTION Mode Shift Staple Jam Content Entrance sensor The entrance sensor does not turn on v within the normal time after the main machine exit sensor turns on v v Entrance sensor The entrance sensor does not turn off Off check within the normal time after it turns on Lower tray exit sensor The lower tray exit sensor does not turn v On check on within the normal time after the entrance sensor turns off v Tray exit sensor The tray exit sensor does not turn off Off check within the normal time after it turns on On check Stapler tray entrance sensor The stapler tray entrance sensor does not switch on within the normal time after the entrance sensor switched on Off check Stapler tray entrance sensor The staple tray entrance sensor does not turn off within the normal time after it turns on Lower tray exit sensor v On check The lower exit sensor does not turn on after the feed out pawl feeds out the outputs Lower tray exit sensor v Off check B408 8 The lower exit sensor turns on when the feed out pawl returns to its home position after feeding ou
8. e motor turns on again to close the exit guide plate When the exit guide plate HP sensor D turns on the motor stops SM 21 B408 STAPLER MECHANISM 4 11 STAPLER MECHANISM The staple hammer motor A drives the staple hammer The staple sheet sensor B detects the leading edge of the staple sheet at the stapling position to prevent the hammer from operating if there are no staples at the stapling position If there is no staple cartridge in the stapler unit or no staples in the staple cartridge staple end is indicated on the operation panel The stapler sensor C detects this The stapler rotation HP sensor D checks whether the staple hammer mechanism returns to home position after each stack has been stapled When excessive load is applied to the staple hammer motor the copier detects a staple jam When a staple jam has occurred the jammed staple is inside the staple cartridge E Therefore the jammed staple can be removed easily after pulling out the staple cartridge B408 22 SM STAPLER UNIT MOVEMENT MECHANISM 4 12 STAPLER UNIT MOVEMENT MECHANISM B The stapler motor moves the stapler A from side to side After the start key is pressed the stapler moves from its home position to the stapling position If two staple position mode is selected the stapler moves to the front stapling position first then moves to the rear stapling position However for the next copy set it staples in the reverse order
9. gate 22 SOL2 SM Stapler Junction Gate Drives the stapler junction gate 13 30 B408 1000 Sheet Finisher ELECTRICAL COMPONENT DESCRIPTION copier printer Symbol Name Function Index No SOL3 Positioning Moves the positioning roller 13 Roller Switches Lower Tray Detects when the lower tray is at its upper limit SW1 07 9 Upper Limit position Front Door Cuts the dc power when the front door is SW2 6 Safety opened Upper Cover Cuts the dc power when the upper cover is SW3 1 opened rea PCB1 Main Controls the finisher and communicates with the 28 B408 14 SM DRIVE LAYOUT 4 4 DRIVE LAYOUT Q oc Su 1 Exit Motor 6 Lower Tray Lift Motor 2 Upper Transport Motor 7 Stack Feed out Motor 3 Lower Transport Motor 8 Jogger Motor 4 Shift Motor 9 Stapler Motor 5 Exit Guide Plate Motor SM 15 B408 JUNCTION GATES 4 5 JUNCTION GATES DF C B D Depending on the finishing mode the copies are directed up straight through or down by the combination of the tray junction gate A and stapler junction gate B These gates are controlled by the tray junction gate solenoid C and stapler junction gate solenoid D Upper Tray Mode The tray junction gate solenoid remains off The copies go up to the upper tray Sort Stack Mode The
10. ide plate M7 Exit Drives the exit roller M8 Lower Tray Lift Moves the lower tray up or down M9 Shift Moves the shift roller from side to side M10 Stapler Moves the stapler unit from side to side Sensors Entrance Detects copy paper entering the finisher and 51 i checks for misfeeds 52 Paper Limit Detects when the paper stack height in the upper tray is at its limit 53 Jogger Fence Detects when the jogger fence is at home HP position S4 Shift HP Detects when the shift roller is at home position Stack Feed out Detects when the stack feed out belt is at home S5 19 Belt HP position S6 Stapler HP Detects when the stapler is at home position 14 Exit Guide Plate Detects when the exit guide plate is at home S7 x 5 HP position Stapler Tray Detects copy paper entering the stapler tray and S8 15 Entrance checks for misfeeds S9 Lower Tray Exit Checks for misfeeds 8 510 Stack Height Detects the top of the copy paper stack 7 Lower Tray Detects when the lower tray is at its lower limit 511 xd 24 Lower Limit position Stapler Tray Detects when there is copy paper in the stapler 12 16 13 Sheet Detects the leading edge of the staple sheet 18 Stapler Rotation Detects when the staple hammer is at home S14 20 HP position 515 Staple Detects whether there are staples in the staple 24 cartridge Solenoids SOL1 Tray Junction Gate Drives the tray junction
11. t the outputs SM DIP SWITCH SETTINGS 3 SERVICE TABLES 3 1 DIP SWITCH SETTINGS The DIP switches should not be set to any combination other than those listed in the table below SW100 Description 1 2 0 0 Normal operation mode Default 1 0 Packing mode e Before packing the machine do the following Set switch 1 to 1 then back to zero The lower tray moves to the lowest position Then turn off the main switch e After unpacking the machine do the following After turning the main switch back on the lower tray returns to home position automatically SM Finisher o 9 B408 GENERAL LAYOUT 4 DETAILED DESCRIPTIONS 4 1 GENERAL LAYOUT 13 4 5 6 12 7 SG ojo 11 pu 10 5 SK 8 T 1 Upper Tray 8 Stapler 2 Upper Tray Exit Roller 9 Stack Feed out Belt 3 Entrance Roller 10 Positioning Roller 4 Tray Junction Gate 11 Shift Roller 5 Upper Transport Roller 12 Lower Tray 6 Stapler Junction Gate 13 Lower Tray Exit Roller 7 Lower Transport Rollers B408 10 SM ELECTRICAL COMPONENT LAYOUT 4 2 ELECTRICAL COMPONENT LAYOUT 1 2 3 Em Fo RB _ gt 10 ff 8 6 HE 25 d 1 Upper Cover Switch 12 Jogger Fence HP Sensor 2 Paper Limit Sensor 13 Positioning Roller Solenoid
12. the jogger unit For the vertical paper alignment the positioning roller solenoid A turns on shortly after the stapler tray entrance sensor B turns off and the positioning roller C pushes the copy against the bottom of the stack stopper D For the horizontal paper alignment the jogger front fence E and the rear fence F move to the waiting position which is 18 mm away from the side of the paper When aligning the paper vertically the jogger fence moves in 14 mm from the waiting position After the vertical position has been aligned the jogger fence pushes the paper 4 mm against the rear fence to align the paper horizontally Then the jogger fence moves back to the previous position B408 20 SM EXIT GUIDE PLATE 4 10 EXIT GUIDE PLATE A Finisher When stacking a large size of paper such as A3 DLT in the jogger unit the leading edge of the paper reaches the exit rollers To prevent the paper from running into the exit rollers and not being aligned correctly the exit guide plate A is moved up to make a gap between the exit rollers This operation is done for all paper sizes but is only needed for the larger sizes 9 e e lt The exit guide plate motor B and exit roller release cam C control the exit guide plate movement When the exit guide plate motor starts the cam turns and the exit guide plate moves up When stapling is finished the exit guide plat
13. tray junction gate solenoid turns on and the stapler junction gate solenoid remains off The copies are sent to the lower tray directly Staple Mode The tray junction gate solenoid and the stapler junction gate solenoid both turn on The copies go down to the jogger unit B408 16 SM UPPER TRAY 4 6 UPPER TRAY A When the paper limit sensor A switches on during feed out for each of three consecutive sheets of paper paper overflow is detected Finisher v SM 17 B408 LOWER TRAY UP DOWN MECHANISMS 4 7 LOWER TRAY UP DOWN MECHANISMS A D E C The vertical position of the lower tray A depends on the height of the copied paper stack on the lower tray The stack height sensor feeler B contacts the top of the stack and the lower tray lift motor C controls the tray height When the lower tray reaches its lowest possible position the actuator D turns on the lower tray lower limit sensor E and copying stops Tray Up When the copy paper on the tray is removed the stack height sensor F turns off and the tray lifts up Then the tray stops when the sensor turns on again the tray pushes up the feeler If the stack height sensor fails the lower tray upper limit switch G detects the tray and stops the motor This is a safety measure against stack height sensor failure Sort Stack Mode Tray Down Every five sheets of
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