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remove the covers to and the top glass to gain access to the lamp . Ensure the A/c power supply is removed from the socket as at times the fuse / tripper may still be live . remove one end of the copper conector , gently slide the fused lamp out. Check the voltage with out replacing lamp, if the volatage reading is near about the lamp rating , replace lamp , if voltage is slightly higher ( 10 % ) it is ok as in many lamp circuits the supply is not a sine wave , but is a saw tooth wave.
According to Canon this error is mainly due to faulty x-lamp, power supply, or exposure sensor. As a technician I fixed this type of error by replacing exposure sensor in several similar cases. So replace exposure sensor it will solve your problem.If you have any difficulties to resolve this issue let me know.
the code 803is for faulty exposure lamp or fault in composite power supply(the power supply to exposure lamp is not sufficiant to operate the lamp).to remove exposure lamp, remove copyboard glass,remove back cover ,slide scanner in the line of rear exahaust fan at the right side of scanner, remove rear exahaust fan, remove lamp holder(one screw).slide out lamp on the rear side replace new one and reverse the whole process.
There are a few possible problems? One is that the scanning lamp is blown or the thermal fuse for the lamp is blown. The question is will the scanning lamp turn "ON" and move and then codes out. If that is the case and most likely the power cable for the scanner lamp is cracked and it is shorting out to the frame of the copier. If you have a meter to measure resistance. You need to turn the copier off & unplug it & take the copy board glass off & put the meter on the ends of the lamp, to read it's resistance. If you have No resistance then the lamp is blown. You will need to replace it. Keep in mind you are working on a copier at least 15 - 20 years old, odds are the power cable is cracked. Good Luck.. If that is so, it is not a easy part to replace or find
1. insufficient exposure lamp
luminosity 2. defective engine pcb 3 incorrect shading position 4. defective CCD unit
check exposure lamp harness
connections; adjust position of contact glass shading plate or
clean/replace the scanner home position sensor; replace the exposure
lamp or inverter pcb if needed; replace CCD unit or engine/main board
Hi sir;Try to make a copy with open cover ( check the exposure lamp is on), if exposure lamp not on andyou already replace a new one then check the thermos fuse at the end of the lamp, replace that one.