Service manual

Troubleshooting
4-18
Samsung Electronics
4-6-3 Print Quality
Error Status Check Solution
Vertical black line and
band
1. Faulty Toner cartridge
2. LSU
3. Bad cleaning blade of drum cartridge.
1. Change Toner cartridge
2. Replace LSU
3. Chang Drum cartridge.
Vertical white line 1. LSU window contamination
2. Toner cartridge
1. Clean LSU window
2. If not LSU, change Toner cartridge.
No image 1. OPC is properly grounded?
2. LSU running well?
3. Bias voltage is correct?
4. Toner low?
5. Is there video data from Main PBA
1. Measure the resistance between frame
ground and the OPC ground spring
attached to the frame. Confirm good
ground. If faulty check ground path
through the frame . Also check OPC
Ground Screw – see page 3-18
2.Adjust LSU or replace it
3. Normal Dev bias = -440V
4. Shake toner cartridge and print. If an
image appears toner is empty
5. Print engine test pattern , replace Main
PBA
Light image 1. LSU light power normal?
2. Enough toner?
3. High charger voltage?
4. Lower bias voltage
5. Contamination of high voltage contact.
6. Transfer voltage and roller.
1. Checking LSU light power is difficult. Com-
pare with new one and check.
2. Check toner and developer counter
3~4. Change the HVPS Board.
5. Stray toner can increase contact resis-
tance and cause a bad contact. Clean
contaminated area.
Dark image 1. LSU light power normal?
2. Bias voltage output is high?
3. Video data is always supplied?
4. Bad C/R voltage contact.
1. Checking LSU light power is difficult. Com-
pare with new one and check.
2. Normal Dev bias = -350V
3. Check Video Data signal(CN2). Replace
main PBA board.
4. Replace Drum Cartridge or check where
is bad point of machine.
Digital Printer
Digital Printer
Digital Printer
Digital Printer
Digital Printer
Digital Printer
Digital Printer
Digital Printer
Digital Printer
Digital Printer
Digital Printer
Digital Printer
Digital Printer
Digital Printer
Digital Printer
Digital Printer
Digital Printer
Digital Printer
Digital Printer
Digital Printer
Digital Printer
Digital Printer