Samsung SL-X7600GX Service Manual page 451

► Error Code
U2–6120 / U2–6121 / U2–6122 / U2–6123
► Error message
LSU Failure: #U2-612x. Please turn off then on
► Symptom
LSU motor does not operate or it operates abnormally. Motor ready signal is abnormal.
► Troubleshooting method
CAUTION
Before unplugging the LSU harness, the machine must be turned off and power cord must be removed.
1) Turn the machine off then on. Check for the LSU motor operation sound during warm-up.
2) Print a demo page to check that the machine operates normally.
3) If the problem persists, check the following :
a) If the LSU motor makes a sound,
i) Enter SVC mode to check the LSU motor ready signal.
( Diagnostics > Engine Diagnostics > Engine Test Routines)
ii) Select "LSU Motor1 Run Ready". ( Diagnostics > Engine Diagnostics > Engine Test Routines >
110-0000)
iii) Press 'Start' button. Check that the status has changed to 'Executing -> Low -> High'.
iv) If the status has not changed, the motor ready signal is abnormal. Replace the LSU.
b) If the LSU motor does not makes a sound,
i) Turn the machine off and open the side cover. Unplug and reconnect the LSU cable. Check that the LSU
motor make a sound after turning the machine on.
ii) Turn the machine off and remove the rear cover. Unplug and reconnect the LSU cable on main board.
Check that the LSU motor make a sound after turning the machine on.
iii) If the LSU cable is defective, replace it. Check that the LSU motor make a sound after turning the
machine on.
iv) If the problem persists, replace the LSU.
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4. Troubleshooting
4-200