■Black spots

<User Check>

- Damp (wet) paper might be used. Try to change to freshly unpacked paper.

- Toner may be empty. Replace the toner cartridge with a new one.

- If the problem is not solved after printing a few pages, the drum unit may have glue from label stock on the exposure drum surface. Refer to the previous page, and wipe it off gently with a cotton swab.

-The drum unit may be damaged. Replace the drum unit with a new one.

Step

Cause

Check

Result

Remedy

 

 

 

 

 

 

 

 

 

 

 

Toner attached

Are the horizontal

 

This problem will

 

on the develop

stripes at 42.5 mm

 

disappear by printing

1

roller

(develop roller

Yes

approximate 10 pages. If

 

 

circumference)

 

the same problem occurs,

 

 

intervals?

 

replace the toner cartridge.

 

 

 

 

 

 

Scratch and Dirt

Are the horizontal stripes

 

Replace the drum unit.

2

on the exposure

at 94.2 mm (exposure

Yes

 

drum

drum circumference)

 

 

 

 

 

 

intervals?

 

 

 

 

 

 

 

 

Drum unit

Are the electrodes on

 

Clean both electrodes

3

connection

the drum unit and

Yes

(Refer to Fig. 3-2, Fig. 3-3.)

 

failure

machine body dirty?

 

 

 

 

 

 

 

 

Scratch and Dirt

Are the horizontal

 

Replace the fuser unit.

4

on the heat roller

stripes at 78.5 mm (heat

Yes

 

 

roller circumference)

 

 

 

 

 

 

 

intervals?

 

 

 

 

 

 

 

 

HVPS PCB

Is the problem solved

 

Replace the HVPS PCB

5

failure

after replacing the

Yes

ASSY.

 

 

HVPS PCB ASSY?

 

 

 

 

 

 

 

 

Main PCB failure

Is the problem solved

 

Replace the main PCB

6

 

after replacing the main

Yes

ASSY.

 

 

PCB ASSY?

 

 

 

 

 

 

 

■Black band

<User Check>

- Clean the inside of the machine and the corona wire in the drum unit. If the same problem occurs after cleaning, replace the drum unit with a new one.

- The paper tray ground terminal provided in the machine body may be dirty. Clean the contact with a dry cloth.

3-56

Confidential