RT25 Service Manual
Contents
1. MC 1 Sensors Drives the paper feed rollers Overrun S 6 Paper End S 7 Paper Feed S 8 Paper Volume S 9 Paper Size Legal S l Paper Size Letter S 2 Paper size B4 S 3 Paper Size A4 S 4 Paper Size B5 S 5 Tray Lift S 11 Tray Down S 10 Switches Access Cover Safety SW l1 Tray Button SW 2 Others Tray Button Indicator O 1 Tray Heater O 2 Senses when the tray is above the feed position The tray moves down until the overrun sensor turns off Detects the presence of paper in the tray Turns off the paper feed clutch also serves as a jam detector Senses the amount of paper in the tray Senses when legal size paper is in the tray Senses when letter size paper is in the tray Senses when B4 paper is in the tray Senses when A4 paper is in the tray Senses when B5 paper is in the tray Turns off the tray motor when the tray reaches the up feed position Turns off the tray motor when the tray reaches the down position Safety switch Lowers the tray bottom plate Blinks when the tray is moving up or down Remains lit when the tray reaches the down position Removes humidity from the paper in tray 8 4 30 April 89 MECHANICAL OPERATION 1 Basic Operation Feed Roller 17 D iinun JEU IBN Friction Rollers Heater The large capacity tray LCT can hold2. Replacement Pa Se lm Cy ps E ELS UU D SN B l Remove the paper feed unit Refer to Paper Feed Unit Removal 2 Open the upper relay roller unit A 3 Remove the paper feed sensor B 2 screws 4 Remove the exit guide C 2 screws 5 Slide out the lower guide plate D 4 screws 6 Replace the friction rollers E 2 E ring and 2 screws 30 April 89 5 Paper Tray Unit Removal l Lower the paper tray 2 Slide out the paper tray unit and remove the paper 3 Remove the upper cover 4 screws and the front top cover A 3 screws 4 Slide the front exterior cover B to the left and remove it 1 con nector 5 Remove the paper tray unit C 2 screws CAUTION When installing the paper feed unit position the rear side paper tray unit so that the pin D on the guide rail is inserted into the hole 8 22 30 April 89 6 Paper Tray Drive Wire Replacement Remove the paper tray unit Refer to Paper Tray Removal 2 Remove the following parts a Tray motor A 4 screws and 2 connectors b Friction roller drive gear assembly B 3 screws c Wire tensioning springs C D Front and rear 3 Loosen the screw for the wire tension stopper E Front and rear Wire End Bead Colors Front Red Rear Blue 30 April 89 4 Rear Wire Replacement a Remove the old wire b Insert the blue end bead A of
3. Tray Lock and Positioning d t Pin Detent Plate Plate EN Plate femi Bumper mmn Lock Lever Tray Stopper When the tray starts moving up the lock lever drops behind a lock plate on the accuride support bracket locking the tray in position to prevent the tray from being pulled out while in the up position When the tray moves to the down position the bottom plate of the tray pushes down a pin on the lock lever The opposite end of the lever then moves up allowing the tray to be pulled out When the tray is set it is positioned by the detent arm The roller of the detent arm presses against the detent plate The tray stopper is fixed to the front right side of the tray and determines the side registration 30 April 89 CIRCUITS 1 Tray Motor Circuit fee e On Main Board DC Drive Board AC Drive Board r 74 3M 24V Tray Hp MET rs oc Te EE OV J CN302 CN301 UV 6 T A 24V CN201 A1 qen BH k UINE V ITAGO M CN314 Tray Dawn 3V EK Te 24V maine l n a Tray Motor uL ay wy rv pe Ud UINZ 12 T E ov T CN302 CB301 d tov 1 SSR6 24V CN201 B13 p s To turn on the tray motor the CPU sends a 3 volt signal from either CN208 A10 or CN208 A11 to the dc drive board The dc drive board then changes either the up or the down trigger line to O0 volts energizing the connected SSR on the ac drive board The paper tray motor lifts the paper tray under the f
4. about 2 200 sheets of paper So the addition of the LCT brings the total paper capacity of the system to 3 700 sheets Paper is always loaded sideways and is positioned at the front of the tray This places the paper path toward the front of the machine making jam removal easy A feed and friction roller FFR feed mechanism separates the top sheet from the paper stack and sends it to the vertical transport mechanism Unlike the trays in the copier there is no paper weight on the front side plate This is because the pick up and feed rollers of the LCT are located closer to the center of the feed mechanism Therefore the paper weight which prevents skewing in the copier trays is not necessary A heater under the tray removes humidity from the copy paper 8 5 30 April 89 2 Feed Unit Mechanism Ist Idle Gear Paper Feed Sensor Ind Idle Gear E Pullout Roller aah Paper Feed Roller P A Vertical Transport Drive Chain The paper feed unit is similar to that of the copier trays Feed roller drive is provided by the copier A gear on the left side of the copier engages with an idle gear on the paper feed unit This idle gear is spring loaded against the copier s drive gear The first idle gear engages a second idle gear which is engaged with the pull out roller gear and turns whenever the main motor is on To actuate the feed mechanism the copier CPU turns on the paper feed clutch The pick up rollers
5. the new wire into the slot of the drive pulley and wrap the wire twice around the drive pulley counterclockwise c String the wire over all the pulleys except the idle pulley B as shown d Wrap the other end of the wire around the drive pulley 2 5 times counterclockwise and insert the bead into the drive pulley slot as shown e Insert the support beads into the slots of the lift rods f Now string the wire over the idle pulley 8 24 10 11 12 30 April 89 Front Wire Replacement a Remove the old wire b Insert the red end bead A of the new wire into the slot of the drive pulley and wrap the wire twice around the drive pulley clockwise c String the wire over all the pulleys except the idle pulley B wrapping the wire around the friction roller drive pulley 5 times clockwise as shown d Wrap the other end of the wire around the drive pulley 2 5 times clockwise and insert the bead into the drive pulley slot e Insert the two support beads into the lift rod slots f Now string the wire over the tension pulley Reinstall the friction roller drive gear assembly and the wire tensioning spring Confirm that the wires are not crossed and that the bottom plate can move down by itself after being lifted manually Reinstall the tray motor Push up the wire tension stopper and tighten it while holding the wire tension 1 screw each front and rear Reassemble the paper tray unit
6. ESCRIPTION Q TY l Paper Conveyor Unit l 2 Paper Entrance Guide 3 Screw M4 x 6mm 4 4 Paper Conveyor Drive Unit l 5 Screw w washer M4 x 6mm 3 6 Idle Gear 31T 7 Idle Gear 36T 8 Cushion 1 9 Leveling Shoe 2 10 Fixing Bracket l 11 Screw M5 x 8mm 2 12 Ground Screw l 13 Docking Stud 14 Misfeed Removal Decal 15 Operating Instructions 16 Installation Procedure 17 N E C R 18 Envelope for N E C R U S A 19 Multiple Language Decals Europe 30 April 89 2 Installation Procedure F CAUTION Turn off the main switch of the copier iP Remove the four strips of tape A and remove the bubble wrap B from the harness bracket Remove the stud C securing the paper tray Remove the lower rear cover D 2 screws and the lower left cover E 2 screws from the copier Remove the 3 plastic caps F and the paper entrance cover G 4 screws from the lower left cover 8 14 30 April 89 lem i a VOUS A Position the paper conveyor drive unit A 2 positioning pins and secure it 3 screws M4 w washer x 6mm Install the two gears 36T B and 3IT C Remove the cover plate D 2 screws Couple the 3 connectors E of the option tray cables with those of the copier harness 6P 12P and 15P Secure the ground wire F 1 ground screw Install the harness bracket G 2 screws 8 15 30 Ap
7. Reinstall the paper tray unit 2 screws Check the up and down operation of the tray 8 25
8. SPECIFICATIONS Paper Size Paper Weight Tray Capacity Power Source Power Consumption Dimensions Weight 30 April 89 Legal 8 7 x 14 Letter 8 x 11 B4 257 mm x 364 mm A4 210 mm x 297 mm B5 182 mm x 210 mm 60 g m 90 g m 16Ib 24lb Approximately 2 200 sheets 100V 50 60Hz from copier 130W 410 mm x 660 mm x 580 mm W x Dx H Approximately 40 kg 88 Ib 8 1 30 April 89 MECHANICAL COMPONENT LAYOUT S Le SaN o ents eo LSU nidi T eC 3 a hj eZ aaa E 7 Paper Entrance Guide 8 Paper Conveyor Unit 5 Pull out Rollers 6 Access Cover 1 Tray Drive Wire 4 Paper Feed Roller 2 Pick up Rollers 3 Friction Rollers 30 April 89 ELECTRICAL COMPONENT LAYOUT OD e X AM ANN E OBERE RC lli BE P un Xs Id 14 N tv i i i 1 Tray Button Indicator 10 Tray Motor 2 Tray Button Switch 11 Paper Volume Sensor 3 Paper Feed Sensor 12 Paper Size Sensor Legal 4 Tray Lift Sensor 13 Paper Size Sensor B4 5 Overrun Sensor 14 Tray Heater 6 Paper End Sensor 15 Paper Size Sensor Letter 7 Motor Capacitor 16 Paper Size Sensor B5 8 Paper Feed MC 17 Paper Size Sensor A4 9 Access Cover Safety Switch 18 Tray Down Sensor 8 3 30 April 89 ELECTRICAL COMPONENT DESCRIPTIONS Motor Tray Motor M 1 Magnetic Clutch Moves the tray up and down Paper Feed
9. acement l Remove the upper cover 4 screws 2 Remove the lift and overrun sensor mounting bracket A 4 screws 3 Lift the pick up roller assembly and remove the pick up rollers B 1 E ring each 4 Install new pick up rollers The pick up roller has a one way bearing When replacing the pick up roller make sure that it can rotate freely in the direction of the arrow as shown 5 Reassemble NOTE Check that the pressure springs C are properly positioned in the tray lift sensor mounting bracket 30 April 89 3 Feed Roller Replacement C l Remove the paper feed unit Refer to Paper Feed Unit Removal 2 Remove the tray lift and overrun sensors mounting bracket A 4 screws 3 Open the upper relay roller unit B and remove the upper plate C 4 Remove the two E rings D from the feed shaft 5 Loosen the two Allen screws on the feed shaft gears E and remove the paper feed clutch male connector F from the bracket 6 Slide out the feed shaft G and remove the old feed roller H 7 After Installing the new feed roller make sure that it can rotate freely in the direction of the arrow as shown CAUTION When reinstalling the feed shaft check that the feed clutch stopper is positioned on the arm NOTE Before tightening the Allen screws on the feed shaft gears check the feed roller thrust play adjustment A 0 2 0 3mm B 0 1 0 2mm 30 April 89 4 Friction Roller
10. and feed roller then start turning When the lead edge of the paper activates the paper feed sensor photoreflector type the paper feed clutch is turned off After that the clutch is turned on again momentarily to feed the paper to the vertical transport section The paper feed sensor also serves as a jam detector The LCT uses the same FFR mechanism as the copier trays 8 6 30 April 89 3 Tray Drive Mechanism Overrun uu Overrun Sensor S 6 J Tray Motor X M 1 J Drive from a reversible ac motor is transmitted through a timing belt and a worm gear to the drive pulley shaft The tray wires have metal beads on them These beads are inserted in slots at the ends of the tray support rods so when the wire pulley turns clockwise rear view the beads on the wires drive the tray support rods and the tray moves upward Since the velocity of the option tray motor is about 2 4 times faster than copier trays the option tray overshoots while moving to the up position To stop the tray at the proper position a sensor overrun sensor is provided at the upper position of the tray lift sensor The tray motor rotates until the tray lift sensor actuates and then overrun sensor is actuated by the motor inertia The motor starts again in opposite direction until the overrun sensor de actuates So the tray stops at the proper position To lower the tray the pulley turns counterclockwise until the tray down s
11. ensor turns off Related Service Call Conditions See FIELD MANUAL for detail SC 25 Option Tray Failure 8 7 30 April 89 4 Friction Roller Reverse Mechanism Like the copier trays the LCT has a delay mechanism to prevent damage to the copy paper when the tray starts moving down The mechanism is the same as that of the copier trays 5 Paper Volume Detection Tray Motor 74 P Valima Sancar Cay c P 4 908 mt l a a apuci v UIUIIIC O2OUCIISUI 3 7 EP d Disk The LCT uses a pulse generator to determine the quantity of paper in the tray The CPU determines how much paper is in the tray based on the number of pulses received from the pulse generator between the time the tray starts moving up and the time the lift sensor turns off Option Tray 60 Hz Option Tray 50 Hz Pulse Count 0 69 70 108 109 1431 144 173 173 Display 0 0 30 April 89 6 Guide Plate and Paper Size Detection lt l Thumb Screw l AGE Rear Fence Paper Size Sensors The rear fence can be moved to change the paper size This is accomplished by loosening the thumb screw and moving the rear fence to another slot The paper size detection sensors are mounted under the paper tray When the rear fence is inserted into one of the paper size positions it enters one of the five photointerrupters The signal from this sensor informs the CPU which size paper is in the tray 8 9 30 April 89 7
12. ollowing conditions 1 When the paper tray is set 2 When the main switch is turned on 3 When a paper feed jam is reset The lift action is terminated when the lift sensor is actuated Due to the high speed of the tray motor 2 4 times faster than the main copier trays and inertia the paper tray sometimes overshoots the feed position when it rises If this happens the overrun sensor is actuated the tray motor then reverses and drops the tray until the overrun sensor turns off The paper tray motor lowers the paper tray under the following conditions 1 Paper end condition 2 When the tray button is pressed 3 Paper feed jam This action is terminated when the tray down sensor is actuated 0 11 30 April 89 2 Paper Tray Heater The tray heater is the same in form and operation as the copier tray heaters 3 Tray Set Detection Main Board Paper Tray NX CN204 A8 When the tray is pulled out the ground connection is broken and the signal at CN204 A8 changes from 0 volts to a 9 volt pulse The CPU then turns off the paper size display When the tray is set CN204 A8 goes from a 9 volt pulse to O volts The CPU then reads and displays the paper size and checks paper volume 30 April 89 INSTALLATION 1 Accessory Check Check the quantity and condition of the accessories in the box according to the New Equipment Condition Report N E C R or the following list Remove all packing material D
13. ril 89 10 11 12 13 14 16 Open the top unit A and remove the development unit cover B 1 screw Position the paper conveyor unit C 2 positioning pins and 1 hook and secure it 2 screws M4 x 6mm Reinstall the development unit cover Stick the cushion D on the front top of the power supply unit shielding box Install the paper entrance guide E 2 screws M4 x 6mm Confirm that the paper conveyor unit opens and closes smoothly Close the top unit Reinstall the lower rear cover and the lower left cover 8 16 17 18 19 20 21 22 23 30 April 89 Parallel When docking the option tray A with the copier B make sure that the docking pins C are firmly seated in the notches D of the copier Install the interlock plate E 2 screws M5 x 8mm Place the leveling shoes F under the option tray leveling feet G and screw down the feet to level the option tray Pull the paper tray out halfway and install the docking stud H Open the left front door of the copier and stick on the misfeed removal decal I Check the option tray operation Complete the N E C R 30 April 89 REPLACEMENT AND ADJUSTMENT 1 Paper Feed Unit Removal P d 1 Undock the option tray from the copier 2 Remove the upper cover A 4 screws 3 Remove the paper feed unit B 5 screws 30 April 89 2 Pick up Roller Repl
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