Canon iR C6800 Series Service Manual page 874

Chapter 13
<Transfer>
Check the secondary transfer outside roller for wear, scar, dirt, and deformation.
Check the blade of the cleaning unit for a tear, warping, deformation, and stray toner.
<Fixing>
Check the fixing roller/pressure roller for wear, scar, dirt, and deformation.
Check the fixing heater (main/sub) to see if it goes on when the power is turned on.
Check the fixing thermistor for an open circuit.
Check the thermal switch for electrical continuity.
<Paper Movement>
Check to see if there is foreign matter such as paper lint.
Check the pickup/feed/separation roller for a buildup of paper powder, wear, scar, dirt, and deformation.
Check the registration roller (middle, outside)/paper path roller for wear, scar, dirt, and deformation.
Check the feed guide for wear, scar, dirt, and deformation.
Check the paper for a bent leading edge, curling, waving, and moisture.
As necessary, try transparencies of a type recommended by Canon to see if the problem, if any, is corrected.
<Machine>
Check to see if an excess load is imposed on the drive system.
Check the gears for wear and chipping.
<Cassette>
Check to see if the cassettes are fitted properly. Check also to see that an appropriate paper size is selected. As
necessary, try a normal cassette to see if the problem, if any, stops.
Check to see that the movement of the cassette holding plate is smooth. Check also to see that the holding plate is
free of deformation.
Check to see if the side guide plate/trailing edge plate inside the cassette are set correctly.
Check to see if the cassette heater switch is at the ON side (if a cassette heater is fitted).
<Service Mode>
Check to see that the various CCD adjustment values are as indicated on the service label.
(COPIER>ADJUST>CCD>all items)
Check to see if registration adjustment is correct.
(COPIER>ADJUST>FEED ADJ>REGIST)
Check to see if the machine inside temperature/humidity is the correct reading.
(COPIER>DISPLAY>ANALOG>TEMP/ABS HUM)
Check to see that the image read position adjustment is correct.
(COPIER>ADJUST>ADJ XY>ADJ X/ADJ Y)
Check to see if the value for ADJUST/OPTION is as indicated on the service label.
Check to see if error initialization has been executed.
(COPIER>FUNCTION>CLEAR>ERR)
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