User manual KONICA MINOLTA DF-311 DF311 SERVICE MANUAL

[. . . ] SERVICE MANUAL MODEL DF-311 JUNE 1998 CSM-DF311 DF-311 TABLE OF CONTENTS SAFETY PRECAUTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . v DF-311 SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [. . . ] VAL ID (DF CB MAIN BODY) Image forming start signal 12 DF-311 Paper exit/reverse conveyance control PS307 Paper path switching in the exit area is carried out by solenoid SD301 (guide plate) which operates a guide plate. In duplex copy mode, the pressure pulley in the reversal section is operated by the SD302 (original pressure). SD301 and SD302 are controlled by the DF CB (DF control board). Operation Sensor adjustment when the power is ON. When SW2 (sub power) is ON, a sensitivity of PS309 (original reversal detect) is adjusted automatically. However, if the RADF open/close cover is open or an original is in the inside of the RADF, there will be no automatic adjustment. 13 Revised 10/00 DF-311 Paper exit operation In single-sided copy mode and when copying the reverse side of a sheet in duplex copy mode, SD301 is OFF and the flapper is closed. The original is therefore conveyed to the paper exit section after scanning. Reversal paper exit operation When copying the first side of a sheet in duplex copy mode, at the specified time after M301 (original conveyance) goes ON and scanning starts, SD301 goes ON and the flapper opens. This causes the original to be sent to the reversal section after scanning. At the same time as SD301 goes ON, M302 (original feed) starts reverse rotation and the drive force is transmitted to the reversal roller. When PS309 (original reversal detect) detects the leading edge of the original and goes ON, the SD302 goes ON after the specified time and applies pressure to the pressure pulley. As a result, the original which has been conveyed to the reversal section is caught between the reversal roller and pressure pulley, and conveyed to the inside of the reversal section. Reversal feed operation When PS309 detects the trailing edge of the original and goes OFF, both the M301 and M302 go OFF after the specified time, and conveyance operation of the original is stopped. After a predetermined OFF interval, M302 starts reverse rotation and feeds the original to the conveyance roller side of the reversal section. At this time, PS309 again goes ON and SD302 goes OFF after the specified time. M302 goes OFF after the specified time from PS309 goes OFF. Pre-feed operation of next original when reading back side of original When PS309 goes OFF, M301 and M302 start forward rotation after the specified time, and next original pre-feed is carried out. Output signals M301 DRIVE A, A, B, B (DF CB M301) M301 (original conveyance) ON/OFF drive signal M302 DRIVE 1, 2 (DF CB M302) M302 drive signal M302 rotation direction is controlled by switching the current direction of these two signals. State Forward rotation Reverse rotation Stop M302 DRIVE 1 H L L M302 DRIVE 2 L H L SD301 DRIVE (DF CB CL301) SD301 (flapper ) ON/OFF drive signal [L]: SD301 ON [H]: SD301 OFF SD302 DRIVE (DF CB SD302) SD302 (original pressure) drive signal [L]: SD302 ON [H]: SD302 OFF DF TXD (DF CB MAIN BODY) Serial data line for transmitting operation status informa tion from RADF to main body control board. DTR (DF CB MAIN BODY) Send request from RADF to main body. CTS (DF CB MAIN BODY) Send acknowledgment from RADF to main body. VAL ID (DF CB MAIN BODY) Image forming start signal Signals Input signals PS304 (PS304 DF CB) M301 encoder surface slit detection signal [L]: Slit is not detected [H]: Slit is detected PS307 (PS307 DF CB) Original detection signal at the paper exit section [L]: Original is detected [H]: Original is not detected PS309 (PS309 DF CB) Original detection signal at the reversal section [L]: Original is detected [H]: Original is not detected DF RXD (MAIN BODY DF CB) Serial data line for transmitting operation status informa tion from control board in main unit to RADF. DSR (MAIN BODY DF CB) Send request from main body to RADF. RTS (MAIN BODY DF CB) Send enable from main body to RADF. 14 DF-311 Original size detection control Operation Normal copy mode The DF CB detects the original size from a combination of the following signals. [. . . ] 11 13 11 11 11 11 49 51 36 27 26 21 M Microswitch . 7 11 18 29 Model DF-311 1st Edition Konica Business Technologies, Inc. Page 21 June, 1998 PART DESCRIPTION Rear cover . Roller plate spring ass'y Roller shaft . 3 9 5 3 5 5 5 5 5 9 9 9 9 5 9 7 5 5 5 9 REF. [. . . ]