Samsung SCX-6320F, Service Manual

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Summary of Product
Service Manual
4-7
Samsung Electronics
4.2.5 Scanner
It reads an image with a photosensitive sensor. It consists of a CCD module, Connection board, DADF
board , AFE (Analog Front End), and Image Processor (Located in CPU), platen glass and DADF.
4.2.5.1 General Specification
• The Scanner specification is as follows:
1) Minimum Scan Line Time : 0.68ms
2) Scan Resolution : Max. 600DPI
3) Scan Width : 216mm
4) Primary Function
- Internal 12bit ADC
- White Shading Correction
- Gamma Correction
- CCD Interface
- 256 Gray Scale
4.2.5.2 CCD Imager Control Specification
• CCD Image sensor uses +5V Power and Inverter uses +24Vpower.
- CCD Max. Driving Frequency : 10MHz
- CCD Line time : 0.68ms
- White Data Output Voltage : 0.7V°æ0.5V (Mono Copy, 0.68ms/line)
- Maximum Inverter Current : 600 mA Max.(Power +24V)
4.2.4 Fusing
The temperature change on the heat roller’s surface is measured using a Thermistor. The resistance of the
Thermistor changes as the temperature changes. The value of the resistance is measured using an A to D
converter and the value is sent to the processor. The processor controls the AC power to the heat coil. If
the processor decides that the temperature is out of range an error message is displayed on the KCD
display. Refer to the table below.
Heat Coil Method
Error Description
Open heat error When preheating, it has been lower than 68°C over 15 seconds.
Lower heat error • After finishing the preheating process, the fuser has not reached 100°C (preheating stop
temperature) within 15 seconds of the temperature reaching 68°C.
• Printing
1) When the main motor is on and after 0.92 second, it has not reached 160°C
within 20 seconds.
2) After the second consecutive page, the fuser has been 20°C lower than the fusing
temperature for more than 4 seconds.
Over heat error This error is not displayed immediately when the fuser reaches 220°C.
The temperature is checked after 3 seconds. If it is over 240°C, it is error.
If the temperature has been higher than 220°C for more than 25 seconds, it is an error
even though the temperature doesn't reach 240°C.