User manual KONICA MINOLTA LT-412 LT402/LT412 SERVICE MANUAL

[. . . ] SERVICE MANUAL Models LT-402/LT-412 JANUARY 2004 CSM-LT402 KONICA MINOLTA BUSINESS SOLUTIONS U. S. A. , INC. LT-402/LT-412 SERVICE MANUAL JANUARY 2004 Used on Konica Models 7155/7165/7255/7272 IMPORTANT NOTICE Because of the possible hazards to an inexperienced person servicing this equipment, as well as the risk of damage to the equipment, Konica Minolta Business Solutions U. S. A. , Inc. strongly recommends that all servicing be performed by Konica-trained service technicians only. Changes may have been made to this equipment to improve its performance after this service manual was printed. Accordingly, Konica Minolta Business Solutions U. S. A. , Inc. , makes no representations or warranties, either expressed or implied, that the information contained in this service manual is complete or accurate. [. . . ] When disassembling and reassembling the machine, follow the precautions given below. Be sure the power cord has been unplugged from the wall outlet. The disassembled parts must be reassembled following the disassembly procedure in reverse unless otherwise specified. Care should be taken not to lose small parts. Care should also be taken not to install small parts in wrong places. Do not operate the machine before installing all the disassembled parts completely. Removal of some screws is prohibited in this section. Never loosen them. LT-402/LT-412 PAPER FEED SECTION [1] Cleaning the Paper Dust Removing Brush Caution:If LT is connected to the main body, make sure that main body power plug is disconnected from the power outlet. (2) Remove six screws to detach the paper feed cover B. [2] Cleaning the LT feed PS (PS106)/LT first paper feed PS (PS107) Caution:If LT is connected to the main body, make sure that main body power plug is disconnected from the power outlet. Procedure (1) Looking into the paper exit side of the LCT from below, and clean sensors through the cavity for LT feed PS (PS106) and the cavity for LT first paper feed (PS107) using a blower brush. Top cover Screws Screws Cavity for PS106 Cavity for PS107 Paper exit side Paper feed cover B (3) Insert a flat bladed screwdriver in the cavities (in two locations) for paper dust removing brush to release the locking lugs, then remove the paper dust removing brush. Paper dust removing brush Cavity Locking lugs (4) Clean the paper dust removing brush using a blower brush. (5) Reinstall the above parts following the removal steps in reverse. 3-1 LT-402/LT-412 [3] Removing and Reinstalling the Paper Feed Roller Unit Caution:If LT is connected to the main body, make sure that main body power plug is disconnected from the power outlet. (2) Remove the spring from the paper feed roller unit. Top cover Spring [4] Replacing the Paper Feed Roller Rubber/Feed Roller Rubber Caution:If LT is connected to the main body, make sure that main body power plug is disconnected from the power outlet. Procedure (1) Remove the paper feed roller unit. (2) Remove the bearing and paper feed reference actuator. Paper feed reference actuator Remove this. Paper feed roller unit Paper feed roller unit Bearing (3) After removing two stop rings, remove the two bearings outward to remove the paper feed roller unit. Paper feed roller unit (3) Remove two stop rings. (4) Remove two bearings outward to detach the roller section from the roller fitting. Roller fitting Bearing Stop rings Bearing Bearing Bearing Stop ring Stop ring (4) Reinstall the above parts following the removal steps in reverse. 3-2 LT-402/LT-412 (5) Remove the bearing from the opposite side of the coupling, then remove the paper feed roller from the shaft. (6) Remove the stop ring to pull the feed roller from the shaft. (7) Remove the rubber from each roller. Paper feed roller rubber Paper feed roller Shaft Coupling [5] Replacing the Double Feed Prevention Roller Rubber Caution:If LT is connected to the main body, make sure that main body power plug is disconnected from the power outlet. Procedure a. Shaft Feed roller Caution: With the power held on, press the LT tray down switch (SW100) to move the up/down plate down to the bottom in advance. (2) Remove two screws to detach the double feed prevention roller unit cover. Double feed prevention roller unit cover Double feed prevention roller Stop ring Bearing Feed roller rubber Paint mark (8) Reinstall the above parts following the removal steps in reverse. Caution1: Make sure rollers and rubber portions are oriented properly when reinstalling them. Caution2: Make sure the one-way clutch direction is correct. Caution3: Check whether grease or the like is present on each roller. Screws 3-3 LT-402/LT-412 (3) Remove two screws to detach the double feed prevention roller unit. [. . . ] Remove the pulley to release wire D. 3-12 LT-402/LT-412 <Installing the Up/Down Wires> Up/down plate 20. Insert wire A in the pulleys, then attach a metal ball. Wire C Wire D Wire C Wire D 7. Insert wire D in the pulleys, then attach a metal ball. Insert wire A in the pulleys, then attach a metal ball. [. . . ]