Samsung CLX-9201 Service Manual page 441

29) Line Skew occurs due to internal module of scanner
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Symptom :
Line skew occurs when platen copy is performed.
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Troubleshooting
1) Open DADF. Remove 5 screws. Remove Scan glass.
2) Use vernier calipers to check & record difference between Front and Rear of FR Module from Scan left exterior.
3) Use vernier calipers to check & record difference between Front and Rear of HR Module from Scan left exterior.
4) As the result,
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If difference of FR is +4 mm and HR is +2mm, (or -4 / -2),
a) Remove pulley screw slightly with allen wrench with size 2mm.
b) Measure length from left-right exterior of FR module with vernier calipers and make it the same and lock it.
c) Make difference of left-right smaller than 0.5mm.
It is OK if difference is smaller than 1mm after locking the screw. (HR needs to be checked)
CAUTION
4 screws (2 front pulleys, 2 rear pulleys) need to be tightly locked. Need to be locked with 7kgf*cm torque.
If it is too strong then pulley can be broken, if it is too weak it can be unlocked.
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If difference of FR is +4 mm and HR is -1mm ~ +1mm
a) Where front screw is located when it is seen from the front of device. /
Where rear screw is located when it is seen from the rear of device.
b) Normally distance between head of screw and Heat Sink is about 1mm. Loosen screw and align FR.
Tighten screw and verify alignment with vernier calipers.
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4. Troubleshooting
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