According to maintenance experience in the fault of the optical scanning system of the machine, the machine of the optical system is mainly composed of plane mirror, lens, mask, reflector, a CCD optical appliances, fluorescent lamp and the corresponding mechanical agencies. L6Eservice manual download site
 L6Eservice manual download site
1. Copy a bottom ash. This is caused by fluorescent tube is pervious to light, mirror surface dirt, shut off the power after the machine is erect, remove the bottom in the middle of the screw, you can see the fluorescent tubes and other components, or lens paper with velvet, cloth rub-up. L6Eservice manual download site
 L6Eservice manual download site
2. Copy end or ends with a black ribbon line, generally is fluorescent tube ageing, both black, change after fault can be ruled out. Change to pay attention to the fluorescent tube of pervious to light for feeding chamber. L6Eservice manual download site
 L6Eservice manual download site
3. Copy a all white, it shows that the CCD light electric equipment has been damaged, must be replaced. L6Eservice manual download site
 L6Eservice manual download site
Part 4. A copy of the all black or black is mostly the cause of the CCD light electrical appliances and lens focus. Here is the key of the optical transmission system is fault happens. Usually after artificial clean optical device failed to recover normal fault. Exclusion method is to adjust the CCD board, artificial adjustment to meet the accuracy requirement, if cooperate oscilloscope carefully adjust, can achieve the best effect. L6Eservice manual download site
 L6Eservice manual download site
Oscilloscope adjustment method: open the fax sail at the back of the little lamp above, can see a CA229 system control circuit, the circuit board has seven test endpoint: TP8, TP10, TP11 and TP1 - TP4. Oscilloscope grounding clip at TP11 (ground), test clip on the TP3 end, open the fax machine and oscilloscope power, according to the steps as shown in the table below for debugging. L6Eservice manual download site
 L6Eservice manual download site
125844 L6Eservice manual download site
 L6Eservice manual download site
When after the completion of step 4, fax of fluorescent light will start automatically scan, then will the oscilloscope attenuation switch knob (vdiv) dial "1" position, the scanning time dial in l (T)/div knob mu s position, show two groups of pulse waveform oscilloscope.

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