User manual KONICA MINOLTA DF-310 DF310 SERVICE MANUAL

[. . . ] SERVICE MANUAL Model DF-310 SEPTEMBER 1997 CSM-DF310 KONICA BUSINESS TECHNOLOGIES, INC. 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 Business Technologies 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 Business Technologies, Inc. , makes no representations or warranties, either expressed or implied, that the information contained in this service manual is complete or accurate. It is understood that the user of this manual must assume all risks or personal injury and/or damage to the equipment while servicing the equipment for which this service manual is intended. Corporate Publications Department © 1999, KONICA BUSINESS TECHNOLOGIES, INC. [. . . ] M301 is controlled by the RADFCB (RADF control board). 24V 0V M301 (paper feed) ON/OFF drive signal M304 DRIVE (RADF CB M301) M304 (push pressure) ON/OFF drive signal [L]: M304 ON [H]: M304 OFF TXD (MAIN BODY RADF CB) Serial data line which transmits the operation status of the RADF to the CB ACK (MAIN BODY RADF CB) Clock signal for signal synchronization when communication is taking place between the RADFCB and the main body CB. Operation Original pressing operation When the RADF receives a control signal from the main body, M304 (push pressure) goes ON, and the original starts to be pressed against the paper feed roller by the original push pressure plate. When PS301 (original set) goes ON -> OFF (light cutoff -> transmission), M304 stops. The original push pressure plate pressing/release operations take place for each original. Paper feed operation When PS309 (up/down) goes ON, M301 goes ON after the specified period, and the paper feed operation starts. (pre-paper feed) PS305 (paper feed) detects the leading edge of the original as a result of M301 going ON, then after the specified period M301 rotates in reverse, and the original is conveyed onto the platen glass. (re-paper feed) 11 CONVEYANCE SECTION Composition Conveyance belt Drive roller Driven roller Mechanisms Mechanism Conveyance belt rotation Method Forward/reverse bidirectional rotation method Stopper-less control method Fixed type *1 Original stopping Scale plate *1: Stopper-less control a. During paper feed The original received from the paper feed section is conveyed to a point 2 mm away from the scale plate by the forward rotation of the conveyance belt, then stops. In this case, the conveyance belt stops rotating in the forward direction after the specified number of pulses from when PS302 (original passage) detects the trailing edge of the original. PS302 Scale plate Original 12 DF-310 b. During reversal During original reversal, the original received from the reversal section is conveyed to a point 2 mm away from the scale plate by the reverse rotation of the conveyance belt, then stops. In this case, the conveyance belt stops rotating in the reverse direction after the specified number of pulses from when PS307 (original reversal) detects the leading edge of the original. Disassembly and Reassembly Screws That Must not be Removed Do not remove the feed driven roller pressing force adjustment screws and original push pressure plate adjustment screws. PS307 Drive roller Do not remove. Do not remove. Scale plate Original Replacing the Conveyance Belt Procedure (1) Remove the three set screws, then remove main body base plate (B). Main body base plate (B) Set screws 13 (2) Remove the two set screws fixing the front of the base plate assembly. (3) Remove the two set screws and remove positioning piece/F. (5) Remove the conveyance belt. Set screws Set screws Positioning piece/F Base plate assembly Conveyance belt (6) Reinstall the above parts in the opposite sequence to removal. (4) Pull the tension board/F assembly in the direction of the arrow, then remove the driven roller. Replacing the Drive Roller Procedure (1) Remove the five set screws, then remove the body base plate (C). (2) Remove the three set screws, then remove the body base plate (B). (Refer to 2. Replacing the conveyance belt) Tension board/F assembly Driven roller Body base plate (B) Set screws Body base plate (C) Set screws 14 DF-310 (4) Loosen the two hex socket screws then remove the drive roller in the direction of the arrow. Drive roller Hex scoket screws (3) Loosen the four set screws of the conveyance motor (M302). (4) Press the tension gauge (full scale 300g) against the center of the timing belrt. (5) When the belt bend value is 5 mm, adjust the tension adjusting screw so that it is specification. Standard: 200g ± 20g (when belt bend value is 5mm) Tension adjusting screws Tension gauge Conveyance pulley Set screws (6) Reinstall the above parts in the opposite sequence to removal. Adjusting the tension of conveyance drive timing belt Procedure (1) Remove the ADF unit from the mainbody. (2) Remove the five set screws, then remove the body base plate (C). Set screw Body base plate (C) (6) Tighten the set screw of the conveyance motor. (7) Reinstall the above parts in the opposite sequence to removal. Set screws 15 Conveyance Control M302 M302 M302 M302 24VDC 103-A7 24VDC 103-A8 DRIVE A 103-A9 DRIVE A103-A10 DRIVE B103-A11 DRIVE B 103-B1 M302 Signals Input signals PS305 (PS305 RADFCB) Paper feed original detection signal [L]: Original exists. DFRXD (MAIN BODY RADFCB) Serial data line which transmits the operation status of the main body CB to the RADF DFREQ (MAIN BODY RADF CB) RADF operation start request signal Output signals M301 DRIVE A, A, B, B (RADF CB -> M301) 24V 0V 24VDC 100-11 PGND 100-12 5VDC 100-10 SGND 100-6 DF DF DF DF TXD 100-1 ACK 100-8 RXD 100-3 REQ 1007 101-1 101-2 101-4 101-5 101-6 101-7 101-8 101-9 5VDC 104-A5 SGND 104-B5 PS305 102-5 PS305 M301 (paper feed) ON/OFF drive signal TXD (MAIN BODY RADF CB) Serial data line which transmits the operation status of the RADF to the CB ACK (MAIN BODY RADF CB) Clock signal for signal synchronization when communication is taking place between the RADFCB and the main body CB. CB RADFCB When an original is fed from the paper feed section, it is set in the copy position. The original is conveyed as a result of the transfer of the drive force of M302 (conveyance) to the drive roller. M302 is controlled by the RADFCB (RADF control board). [. . . ] Remaind detect actuator Remaind detect plate . Remaind detect plate (B) Remaind detect shaft . Resist drive shaft holder Resist driven roller . Resist driven shaft holder Resist sensor . [. . . ]