Samsung SCX-4720F

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Service Manual

Troubleshooting

7-14

Samsung Electronics

7.3.11 Ghost (3)

• Description Ghost occurs at 66.3 or 75.5 mm intervals.

Digital Printer

32 mm

Check and Cause Solution

1. Disassemble the fuser and remove any

contamination on the rollers. Clean any

contamination from between the

Thermistor and the Heat roller. (Caution:

Take care not to deform the rollers.)

Fuser contamination.

7.3.13 Stains on the Face of the Page

• Description The background on the face of the printed page is stained.

Digital Printer

Check and Cause Solution

1. Toner leakage due to improperly sealed

toner cartridge.

2. If the transfer roller is contaminated,

stains on the face of page will occur.

1. Replace the toner cartridge.

2. If the transfer roller is contaminated, run

PC Cleaning Mode Print 2 or 3 times and

then perform Self-Test 2 or 3 times to

remove contamination.

7.3.12 Ghost (4)

• Description A White ghost occurs in a black image printing at 32 mm intervals.

Digital Printer

32 mm

Check and Cause Solution

1. Problem in the toner cartridge, replace the

toner cartridge and try to print out again.

2. Check the HVPS supply voltage. Clean all

HV terminals on the cartridge and on the

set. Replace the HVPS if the problem

persists.

1. The life of the developer may be expired.

2. Abnormal output from the HVPS.

(Run EDC mode – see sections

6.5.1

and 6.5.3

)

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