Toshiba 4511, 3511 (12) White banding (at right angles to feeding direction)

e-STUDIO3511/4511 TROUBLESHOOTING 5 - 120 November 2003 © TOSHIBA TEC

(12) White banding (at right angles to feeding direction)

Feeding direction

Cause/Section

Main charger

Drum

Discharge lamp

Developer unit

Drive systems

High-voltage

transformer

(main charger wire/

grid, 1st/2nd transfer

roller and developer

bias)

Step

Check items

Is there foreign matter on the charger?

Is the terminal contact poor?

Is there any abnormalities on the drum

surface?

Is the drum grounded?

Is the discharge lamp lighting properly?

Is the developer sleeve rotating cor-

rectly? Is there any abnormalities on the

sleeve surface?

Is the connection of developer bias

supply terminal normal?

Is the drum, scanner or transfer belt

jittery?

Is the high-voltage transformer output

defective?

Measures

Remove foreign matter.

Clean or adjust the terminals.

Replace the drum.

Check the contact of the grounding

plate.

Replace the discharge lamp or clean

terminals.

Check the developer drive system, or

clean the sleeve surface.

Correct it.

Check each drive system.

Check/correct any electric leakage and

related circuits.

If the high-voltage transformer does not

work, replace it.

Fig. 5-213