Samsung SCX4521F Service Manual - Page 123
Abnormal noise, Defective Image Quality
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Troubleshooting 6.7.3 Abnormal noise • Description There is noise from the ADF when copying. Check and Cause 1. Check the Scanner Motor, gearbox and rollers. 2. Check the Motor Driver on Driver PBA. Solution 1. Check for correct assembly of gears and motor. Ensure no parts are fouling and there are no foreign objects in the mechanism or scanner path. Replace any worn parts 2. Replace the main PBA and ADF PBA in seguence. 6.7.4 Defective Image Quality • Description The copied image is excessively light or dark Check and Cause 1. Check shading profile. 2. Check the gap between original and scanner glass. 3. Check printing quality. Solution 1. Redo shading profile in the tech mode. 2. A gap of more than 0.5 mm can cause a blurred image. Ensure rollers and cover close correctly. Replace as necessary. 3. See "Print" troubleshooting. 6-28 Service Manual Samsung Electronics
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