Samsung SCX-6555N Service Manual page 217

4.2.2.12 General solution
Error
[Description]
[Wrong Part]
[Check and Cause]
[Solution]
Error
[Description]
[Wrong Part]
[Check and Cause]
[Solution]
Error
[Description]
[Wrong Part]
[Check and Cause]
[Solution]
Service Manual
CÓPIA NÃO CONTROLADA
Alignment & Troubleshooting
LCD NOT DISPLAY
Engine is warming up properly but LCD does not display anything on.
1. Main Controller
2. OPE
3. SMPS
1. Check 24V on Main controller.
2. If 24V from Main controller is normal, Check the CCFL inverter harness on
OPE_Main.
3. If not, check the F 71 on SMPS.
1. 24V power and CCFL inverter harness connection are on normal, replace
OPE_Main first and retry.
2. Keep on problem with 24V on, replace the Main controller.
3. Replace the SMPS.
LSU Error
LSU sync Error displays on LCD
1. Drum Cartridge
2. Main Controller
3. Cover Open Connector
1. Check LSU 5V/24VS
2. Main Controller LSU Part defect
3. Micro Switch Harness
1. Replace Drum Cartridge and retry
2. Replace Main Controller.
3. Replace Micro Switch Assy
Cover Open
The cover open massage displays on even when the print cover is closed.
1. Hook Lever in the side cover / Micro Switch
1. The Hook Lever in the top cover may be defective.
2. Check the CN8-4 on Main B°ØD and the micro switch on the rear side of set.
1. Replace the hook lever, if defective.
2. Check Cover Open harness. Replace Cover Open S/W
3. Replace the Main Control board.
CÓPIA NÃO CONTROLADA
4-117
Samsung Electronics