Lexmark C 950 Service Manual
Have a look at the manual Lexmark C 950 Service Manual online for free. It’s possible to download the document as PDF or print. UserManuals.tech offer 166 Lexmark manuals and user’s guides for free. Share the user manual or guide on Facebook, Twitter or Google+.
Diagnostic aids 3-79 5058-030 Go Back Previous Next The media eject shaft assembly is driven by the media eject motor assembly to transfer media to the stacker media bin. After media is transferred to the stacker media bin, it is held by the clamp paddle attached to the media eject shaft assembly. From punch to upper media bin The media to be ejected to the upper media bin is switched in the media path by the finisher diverter gate located behind the punch and fed in the upper media transport roll assembly direction. The finisher diverter gate is switched by the finisher diverter gate solenoid. While the solenoid is activated, media is fed in the upper media transport roll assembly direction. The two upper media transport roll assemblies driven by the motor (buffer/transport) feed media to the upper media exit roll assembly top at the top of the finisher. The upper media exit roll assembly top driven by the drive motor (exit) ejects the media to the upper media bin. The upper media exit roll assembly decelerates after a specified period of time from the following trigger events. Functions of sensors along the media path Bridge unit assembly • Sensor (bridge unit media entrance) – A photo-interrupter sensor that detects whether media is fed from the printer to the bridge unit assembly. – It turns high (+5 V dc) (light receiving) when media enters the bridge unit assembly. • Sensor (bridge unit media exit) – A photo-interrupter sensor that detects whether media passes through the bridge unit assembly. – It turns high (+5 V dc) (light receiving) when media reaches this sensor, and turns low (0 V dc) when media exits from the bridge unit assembly. • Sensor (bridge unit top cover interlock) – A photo-interrupter sensor that detects open/close of the bridge top cover assembly of the bridge unit assembly. – It turns high (+5 V dc) (light receiving) when the bridge top cover assembly opens. Bridge unit assembly Bridge media entrance sensor Transport rolls Bridge exit sensor Decurler roll
3-80 Service Manual 5058-030 Go Back Previous Next Finisher • Sensor (finisher media entrance) – A photo-reflective sensor detects whether media is fed from the bridge unit assembly to the finisher. – It turns high (+5 V dc) while media is present within the sensing area. – When the level turns high due to the first media of the second set during multi-set printing, this sensor activates the buffer diverter solenoid to switch the buffer diverter gate so that the media goes in the buffer roll assembly’s circumferential direction. • Sensor (diverter gate) – A photo-reflective sensor that detects the leading edge of the media. – It turns low (0 V) when the front end reaches the sensing area. • Sensor (lower media exit) – A photo-interrupter sensor that detects whether media passes through the sensor (lower media exit). – It turns high (+5 V) (light receiving) when the actuator is driven out of the sensing area by the media. – When the level turns high, this sensor activates the front tamper motor and the rear tamper motor on the compiler unit assembly. – This sensor is also used to control on/off of the media eject motor assembly. • Sensor (compiler media present) – A photo-interrupter sensor that detects whether media is present or not on the compiler unit assembly. – While media is present, the actuator is outside the sensing area, and the sensor turns high (+5 V dc) (light receiving). • Sensor (buffer path) – A photo-interrupter sensor that detects whether media is fed toward the buffer roll assembly. – While media is present, the actuator is outside the sensing area, and the sensor turns at high (+5 V dc) (light receiving). • Sensor (upper media exit) – A photo-interrupter sensor that detects whether media is fed to the upper media exit roll assembly top at the exit side of the upper media bin. – When the media is fed, the actuator leaves from the sensing area, and the sensor turns high (+5 V dc). • Sensor (upper media bin full) A photo-reflective sensor that detects the stack volume of media in the upper media bin. Sensor (upper media exit) Sensor (upper media bin full) Sensor (lower media exit) Sensor (compiler media in) Sensor (buffer path) From bridge unitSensor (diverter gate) Sensor (finisher media entrance)
Diagnostic aids 3-81 5058-030 Go Back Previous Next Punch unit This section describes the media punching operation of the punch. Two types of punch are provided: the 2/3-hole type and the 2/4-hole type. The following explains the 2/3-hole type (2-hole/3-hole auto-switching). Every type has the same construction, except for the sensor (punch hole select) that is provided for the 2-hole type and 3-hole type only. Adjusting punching positions The punching positions from the media edge in the direction of feed are determined by gently pressing the media against the three punch media stopper assemblies. The three punching positions from the media edge in the direction of media width are determined by the following method. • Activate the punch carriage shift motor assembly, and move the punch to the front side until the sensor (punch carriage shift HP) turns low. • Reversely rotate the motor, and move the punch to the rear side until the sensor turns high to determine the home position. • The punch carriage shift motor assembly is activated to move the punch to the front until the sensor (punch unit side registration 1) and the sensor (punch unit side registration 2) detects the media edge, and then the punch is further moved to the front according to the pulse-number determined by the media size. (The punch carriage shift motor assembly stops at this position.) Punching After punching positions are determined, the punch unit motor is activated to move the cam plate. With the movement of the cam plate, the pins descend along the guide holes to punch the media. This operation is performed for each sheet of media. The cam plate can lower the pins even while it is moving to the front or rear side. Sensor (punch carriage shift HP) Punch carriage shift motor assembly Sensor (punch unit side registration 2) Sensor (punch unit side registration 1) Punch unit motor Sensor (punch unit motor encoder)Sensor (punch unit HP)Sensor (punch hole select) Sensor (punch cam front)
3-82 Service Manual 5058-030 Go Back Previous Next The punch unit motor is rotated forward or reversely for each sheet of media, which is triggered by the sensor (punch cam front) being turned on/off. Detecting punch waste full Punch waste is stored in the punch waste box. A sensor is provided to detect punch waste full. When punch waste full is detected, it is notified to the operator only once. Even if punch waste is not removed, the finisher can still punch media. However, it can spread punch waste inside the machine. Pin position Home position Sensor (punch hole select) Sensor (punch cam front) Sensor (punch unit HP) Punch unit motorPinCam plate 3 hole position Home position 2 hole position Home position
Diagnostic aids 3-83 5058-030 Go Back Previous Next Detecting punch waste box The sensor (punch waste box set) detects whether the punch waste box is properly set. When the sensor (punch waste box set) does not detect that the punch waste box is properly set for four seconds, the punch waste box count is reset. Functions of punch sensors/motors • Sensor (punch unit side registration 1) – A photo-reflective sensor that detects the side edge of large media. – Media side edge is detected by On/Off of this sensor while shifting the punch (containing this sensor) in the direction of media width. – The sensor remains at high (+5 V dc) while media is present, and turns low when media side edge is detected. • Sensor (punch unit side registration 2) – A photo-reflective sensor that detects the side edge of small media. – This sensor has the same function as the sensor (punch unit side registration 1). • Sensor (punch carriage shift HP) – A photo-interrupter sensor that detects the home position of the moving punch. – It turns high (+5 V dc) (light blocking) when the home position is detected. • Sensor (punch unit HP) – A photo-interrupter sensor that detects the home position of the cam plate that lowers the punching pins. – It turns high (+5 V dc) when the home position is detected. • Sensor (punch hole select) – A photo-interrupter sensor that detects the rear position of the cam plate. – It turns high (+5 V dc) when the rear position is detected. – This sensor also detects the cam position to switch punch holes (2-hole/3-hole). • Sensor (punch cam front) – A photo-interrupter sensor that detects the front position of the cam plate. – It turns high (+5 V dc) when the front position is detected. – This sensor is used to determine to which side (front or rear) the cam plate should be moved. • Sensor (punch unit motor encoder) – A photo-interrupter sensor that detects pulse generated by the encoder attached to the punch unit motor. – It counts punch unit motor revolutions and becomes a trigger to stop the motor (by shutting off the current). • Punch carriage shift motor assembly – A stepping motor to move the punch in the media width direction. • Punch unit motor – A DC motor to move the cam plate that lowers the punching pins. – Forward rotation of the motor moves the cam plate to the front side, and reverse rotation moves it to the rear side.
3-84 Service Manual 5058-030 Go Back Previous Next • Sensor (punch waste box set) – A photo-interrupter sensor that detects whether the waste box is properly set. – When the punch waste box is properly set, the actuator of the box blocks the light transmission of the sensor, which turns the sensor to high (+5 V dc). • Sensor (punch waste box full) A photo-interrupter sensor that detects whether the punch waste box is filled with punch waste. Compiler unit assembly This section describes the operation of the compiler unit assembly which aligns the media edge transferred from the punch unit. Outline of operation When media is fed onto the compiler unit assembly, tamping is performed to align the media edge in the media width direction. When ejecting stapled sets of media to the stacker media bin, if they are stacked in the stacker media bin with the same staple position, the height of the stapled portion will increase. This will cause improper compiling of media due to butting of the following media. To prevent such improper compiling, offsetting is required by shifting the staple position between sets of media. Sensor (punch carriage shift HP) Punch carriage shift motor Sensor (punch unit side registration 2) Punch unit motor Sensor (punch unit motor encoder) Sensor (punch unit HP)Sensor (punch hole select)Sensor (punch cam front) Sensor (punch unit side registration 1) Rear tamper Front tamper Sensor (front tamper HP) Front tamper motor Sensor (compiler media in) Rear tamper motor Sensor (rear tamper HP)
Diagnostic aids 3-85 5058-030 Go Back Previous Next Capacity of compiler unit assembly Media volume that can be stacked on the compiler unit assembly is limited as shown in the table below. The number of sheets depends on whether media is stapled or not, as well as on media size. If the number of sheets of one set to be stapled exceeds the limit, the exceeding sheets are not stacked on the compiler unit assembly, and are forcibly ejected to the stacker media bin without being stapled. This forcible ejection is performed to prevent damage to the staple assembly. When feeding large media in the non-staple mode, there may be a misalignment depending on media characteristics. For this reason, the default media capacity is set to a smaller value. Compiler unit assembly operation with multiple media sizes When two or more media sizes are used and their widths are the same (example: A4L and A3S), all the sheets are compiled and stapled as a set on the compiler unit assembly, and then ejected to the stacker media bin. When two or more media sizes with different media width are used, stapling media on the compiler unit assembly is stopped when a different size is detected. Such different-sized sheets of media are forcibly ejected to the stacker media bin. Tamping When media is fed from the punch to the compiler unit assembly, tamping is performed to align the media in the media width direction on the compiler unit assembly. Tamping is an operation to align media to the specified position on the compiler unit assembly. The front tamper or rear tamper is moved to the end of the media by its motor. Tamping is executed each time when a sheet of media reaches the compiler unit assembly. Additional tamping is executed after the last sheet is tamped. There are three types of tamping: • Front tamping—Tamping by the rear tamper with the front tamper fixed at the home position. • Rear tamping—Tamping by the front tamper with the rear tamper fixed at the home position. • Center tamping—Tamping by the front and rear tampers to align media to the center. Front tamping Front tamping is used in the following cases. • In the non-staple mode • When executing front stapling (corner) Compiler unit assembly media capacity Condition Min. Default Max. Staple mode 2 50 75 For small media (less than 216 mm in the feed direction) in non-staple mode10 50 100 For large media (216 mm or more in the feed direction) in non-staple mode10 25 100
3-86 Service Manual 5058-030 Go Back Previous Next The tamper positions during front tamping are shown below. Rear tamping Rear tamping is used in the following cases. • When executing rear stapling (corner) • When executing dual stapling The tamper positions during rear tamping are shown below.Position Description 1 Front tamper home position—sensor (front tamper HP) 2 Front tamper size position 3 Front tamper offset position 4 Rear tamper home position—sensor (rear tamper HP) 5 Rear tamper standby position 6 Rear tamper tamping position 7 Rear tamper offset position Position Description 1 Front tamper home position—sensor (front tamper HP) 2 Front tamper tamping position Sensor (front tamper HP) FrontSensor (rear tamper HP) Rear Rear tamper motor Rear tamper Front tamper Front tamper motor Sensor (front tamper HP) FrontSensor (rear tamper HP) Rear Front tamper motor Front tamper Rear tamper motor Rear tamper
Diagnostic aids 3-87 5058-030 Go Back Previous NextCenter tamping Center tamping is used when executing rear stapling (straight). The tamper positions during center tamping are shown below. Determining tamper home position When the sensor (lower media exit) turns high (+5 V dc) (light receiving), the front and rear tamper motors on the compiler unit assembly are activated, and the front and rear tampers start moving. The front tamper home position is determined when the front tamper enters the sensor (front tamper HP) sensing area. In the same way, the rear tamper home position is determined when the rear tamper enters the sensor (rear tamper HP) sensing area. Tamping Tamping is executed after a preset time has passed after the sensor (compiler media present) turns high (+5 V dc) when media is detected on the compiler unit assembly. 3 Front tamper offset position 4 Rear tamper home position—sensor (rear tamper HP) 5 Rear tamper size position 6 Rear tamper offset position Position Description 1 Front tamper home position—sensor (front tamper HP) 2 Front tamper standby position 3 Front tamper tamping position 4 Front tamper offset position 5 Rear tamper home position—sensor (rear tamper HP) 6 Rear tamper standby position 7 Rear tamper size position 8 Rear tamper offset position Position Description Sensor (front tamper HP) FrontSensor (rear tamper HP) Rear Front tamper motor Front tamper Rear tamper motor Rear tamper
3-88 Service Manual 5058-030 Go Back Previous Next Offsetting Offsetting is an operation to shift the position of media to be ejected to the stacker media bin so that boundaries between media units (sets of media, job units, etc.) can be easily recognized. Offsetting is executed for staple positions: • During front stapling (corner)—Shifts stapled sheets using the front tamper by 20 mm to the rear side before ejecting them to the stacker media bin • During rear stapling (corner/straight) – For media with a width of 216 mm or more [rear staple (corner)]—Shifts stapled sheets using the rear tamper by 20 mm to the front side before ejecting them to the stacker media bin – For media with a width of less than 216 mm [rear staple (straight)]—Shifts stapled sheets using the front tamper by 9 mm to the rear side before ejecting them to the stacker media bin. During dual stapling: • Shifts stapled sheets using the front tamper by 9 mm to the rear side before ejecting them to the stacker media bin. • Offsetting is not executed (0 mm) for small media. Functions of compiler unit assembly sensors/motors • Sensor (compiler media in) – A photo-interrupter sensor that detects whether media is present or not on the compiler unit assembly. – When media is detected, the actuator leaves the sensing area, which turns the sensor to high (+5 V dc) (light receiving). • Sensor (front tamper HP) – A photo-interrupter sensor that detects the front tamper home position. – When the front tamper comes to the home position, it enters the sensor’s sensing area, which turns the sensor to high (+5 V dc) (light blocking). • Sensor (rear tamper HP) – A photo-interrupter sensor that detects the rear tamper home position. – When the rear tamper comes to the home position, it enters the sensor’s sensing area, which turns the sensor to high (+5 V dc) (light blocking).