U2-Xxxx Type (Lsu) Error Code - Samsung CLX-8640 series Service Manual

4. Troubleshooting

4.6.8. U2-xxxx type (LSU) error code

► Error Code
U2–6121
U2–6122
U2–6123
► Error message
LSU Failure: #U2-6121. Please turn off then on.
LSU Failure: #U2-6122. Please turn off then on.
LSU Failure: #U2-6123. Please turn off then on.
► Symptom
LSU motor does not operate or it operates abnormally. Motor ready signal is abnormal.
► Troubleshooting method
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 :
• If the LSU motor makes a sound,
a) Enter SVC mode to check the LSU motor ready signal.
(Diagnostics > Engine Diagnostics > Engine Test Routines)
- Press 1,2,3 number keys simultaneously. When the password dialog box appears, enter "1934" and
press the "OK" button.
b) Select "LSU Motor1 Run Ready". ( Diagnostics > Engine Diagnostics > Engine Test Routines >
110-0000)
c) Press 'Start' button. Check that the status has changed to 'Executing -> Low -> High'.
d) If the status has not changed, the motor ready signal is abnormal. Replace the LSU(JC97-04073A).
(Refer to 3.3.6. LSU)
• If the LSU motor does not makes a sound,
a) Turn the machine off and open the side cover. Unplug and reconnect the LSU cable.
Harness, JC39-01791A : Flat
b) If the LSU
that the LSU motor make a sound after turning the machine on.
c) If the problem persists, replace the LSU(JC97-04073A).
4-249
cable) Check that the LSU motor make a sound after turning the machine on.
Cable(JC39-01743A : Motor Harness, JC39-01791A : Flat cable) is defective, replace it. Check
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(JC39-01743A : Motor