Samsung MultiXpress M5370 Series Service Manual page 408

4. Troubleshooting
2) Paper detecting error & Skew error
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Symptom :
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When original paper size is A4 or Letter, system is detected as legal.
NOTE
If the user select the continue button at the UI screen, the print can continue under this error status condition.
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If the rear side of DSDF is so much lift up, Skew error also can be occurred.
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Cause :
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The rear side of DSDF is not closed fully due to high force of hinge spring.
So, APS sensor can't detect original paper size.
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Troubleshooting
It is need to exchange the Hinge Assembly with improved one.
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Improved hinge applied for mass production from Oct.2014
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Hinge-left and Hinge-right have to be replaced together.
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After exchanged the new hinge, it is need to check the scan margin.
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If scan margin need to adjust, please make progress auto adjustment job for scan margin and shading test also
need to conduct.
1) Remove 8 screws. Then, disassemble the old hinge assembly from the DSDF unit.
2) Exchange the hinge assembly with new improved hinge.
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