Page 1 This course explains how to service the Lef-C1 black-and-white copiers. To learn about these models, please study the user’s guide and the field service manual in addition to this TTP.
Page 3 The ‘+’ in the model name refers to the fact that this is an A4 machine with A3 capability.
Page 4 Smart Operation Panel version is Cheetah-G2. The machine is quite compact, and some parts are a bit difficult to access. Silent mode is a new feature. It will be explained in more detail later.
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Page 6 A more detailed comparison follows later.
Page 7 Step 1 is for saving space. In both cases, the paper type is limited. The customer can use only plain paper, because the angle of feeding is sharp...
Page 8 Silent mode is a new function. It will be explained later.
Page 9 Fan Control will be explained later.
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Page 12 There is no platen cover option.
Page 13 Noise level: 59 dB in normal mode, 55 dB in silent mode...
Page 14 See parts catalog for the part number of Grease G-1077.
Page 15 Condition： A4 (LT) long-edge feed 5% image coverage ratio 2P/J APV is 2k/Month...
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Page 17 APV = 2 K/month, and the machine has a 5 year life time. So printing for 5 years with an APV of 2K/month, the machine will make in total 120K (2Kx60) prints during these 5 years. These are called yield parts because you will not have to replace them within the machine’s life, if the APV is normal (2k per month).
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Page 20 The blue lines indicate duplex feed.
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Page 29 The internal temperature sensor controls the rotation of the intake and exhaust fans.
Page 30 PSU: Power Supply Unit DHB: Dehumidification Heater Board MKB: Meter Click Board (for installing the meter click device) HVP: High Voltage Power supply HDD: Hard Disk Drive BiCU: Base and Imaging Control Unit...
Page 31 OPU: Operation Panel Unit SCN: Scanner Unit...
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Page 38 This section covers the main points of the installation procedure. For the complete procedure, see the service manual.
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Page 45 The operation panel also has a USB slot. The mini USB slot to the left of the SD card slots is only for models on sale in Japan.
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Page 48 As you can see in the diagram, all modules for paper feed are driven by one motor. This reduces the noise compared to using a number of motors. The inner gear prevents noise leaking from the motor.
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Page 50 If you forget to apply the grease, noise will occur. The position which applys the grease will be explained later.
Page 51 Red lines show the parts that use the labyrinth structure. These locations are where noise is likely to leak.
Page 52 The silencer has many small holes, the noise resonates in the holes, and then disappears as a result. A silencer is attached to the laser unit, the paper exit and other areas where noise may occur.
Page 53 Changes in paper feed speed are not shown in the above table.
Page 54 To reduce the noise, the intake fan and exhaust fan are controlled with temperature sensors. The detected temperature affects the speed of fan rotation as shown above.
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Page 57 The original size can be detected with the registration sensor and the width sensor. Length can be detected by how much time it takes for the original to arrive at the registration sensor from the initial position.
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Page 69 When the platen cover detects the change from OFF from ON, the APS sensors detect the original size.
Page 70 Legal size is not supported, because the width of the contact glass is smaller than the width of Legal.
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Page 72 The exposure glass and the scale are just connected by the seal, so it may fall off when you lift it.
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Page 79 There are no SP adjustments to make after installing the new unit.
Page 80 Correct: Insert it along the left side If you do this incorrectly and then it becomes completely hidden, you cannot pull it out easily. You have to remove the PCDU, and then you can pull it out from the right side.
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Page 82 First of all, the structure of the PCDU for this product is the same as usual for an A3 B&W MFP. It is almost the same as the K-C4.
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Page 84 The motor speed will normally not exceed the regulation speed.
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Page 87 This model uses a counter blade system.
Page 88 The PCL is located in the transfer unit.
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Page 90 The TD sensor is a µ (mu) sensor.
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Page 106 Each thresholds can be automatically changed by executed the following SP.
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Page 109 No SP settings are needed after installing a new PCDU.
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Page 117 The spring is always pulled the same amount when the tray is inserted, regardless of the amount of paper in the tray. So, there is pressure between the top of the stack and the feed roller.
Page 118 When the paper tray is drawn out with no paper in the tray, the paper end feeler is not caught in the paper tray due to its shape.
Page 119 The pick-up roller is lowered by roller rotation. There is no solenoid.
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Page 122 You may have to remove this unit to clean the registration sensor.
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Page 134 SP7-622-115 is the only SP to clear the counter for yield parts (120K).
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Page 138 The exit roller and exit sensor are included in the fusing unit.
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Page 140 The next slide explains how this mechanism is controlled with a solenoid.
Page 141 The solenoid turns off when the center thermistor reaches 80 degrees C.
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Page 145 If you remove the bushing, the spring length is reduced by the length of the bushing. The pressure is reduced by 10%.
Page 146 If fluorescent lights flicker Turning the fusing lamp on and off may cause the fluorescent lights to flicker. This problem can be lightened by changing the setting of SP1-135-002 from 0 to 1. If you do this, fusing capability may decrease because the power supply to the fusing unit is reduced when the fusing lamp is on.
Page 147 The center thermistor is for the fusing lamp (860 W). The end thermistor is for various other control mechanisms.
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Page 153 The fusing temperature differs according to paper type. When printing on Middle Thick or Thick Paper and when printing in silent mode, the process speed is lower. Thin: 52 – 59gsm Plain 1: 60 – 74 Plain 2: 75 - 81 Middle thick: 82 –...
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Page 156 The thermostat used in this model has a higher thermal responsiveness than those used in previous models. Therefore, the temperature of the hot roller will be kept lower.
Page 157 SP7-622-115 is the only SP to clear the counter for yield parts (120K).
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Page 165 If you forgot to apply the grease, it may occur the noise, and so on, like the case of other greases. How to apply the grease in each parts, please refer to the service manual.
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Page 167 Regarding to detailed section descriptions, this optional bank is similar to the PB2020, used with Bc-C1.
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Page 174 The End...

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