Samsung CLX-8540ND Service Manual page 265

● Code : 04-001
04-010
● Symptom : After Black LD is on, Laser Beam Detect signal has not occurred or is irregular. (04-001)
After Cyan LD is on, Laser Beam Detect signal has not occurred or is irregular. (04-010)
● Possible Cause:
1. Harness is defective, Connector is not connected properly.
2. LSU is defective.
3. Engine Board is defective.
● Troubleshooting method :
1. Check the following.
-. Check if the Engine Board Harness is defective.
-. Check if the harness is connected to the 'LSU 3&4' Connector on Engine Board properly.
-. Check if the joint ①,② harness are connected properly.
Joint ①
2. Replace the LSU.
[Refer to 3.2.2 General Disassembly / LSU ]
3. If the problem persists after replacing the LSU, replace the Engine Board.
Troubleshooting
● Error message : LSU error: #04-001. Please turn off then on.
LSU error: #04-010. Please turn off then on.
(CN22, 34pin)
Joint ②
4-103
'LSU 3&4'