■Black horizontal stripes

<User Check>

- Clean the inside of the machine and the corona wire in the drum unit.

- Replace the drum unit with a new one.

Step

Cause

Check

Result

Remedy

 

 

 

 

 

 

 

 

 

 

 

Dirt on the

Are the electrodes on

 

Clean both electrodes.

1

charged

the drum unit and

Yes

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

 

electrode

machine body dirty?

 

 

 

 

 

 

 

 

Paper tray

Is the paper tray ground

 

Correct bending of paper

 

ground terminal

terminal bent, which is

 

tray ground terminal.

2

provided in the

provided in the machine

Yes

 

 

machine body

body?

 

 

 

 

(Refer to Fig. 3-7.)

 

 

 

 

 

 

 

 

Toner attached

Are the horizontal stripes

 

This problem will disappear by

3

on the develop

at 42.5 mm (develop

Yes

printing approximate 10 pages.

roller

roller circumference)

If the same problem occurs,

 

 

 

 

intervals?

 

replace the toner cartridge.

 

 

 

 

 

 

Scratch and Dirt

Are the horizontal stripes

 

Replace the drum unit.

4

on the exposure

at 94.2 mm (exposure

Yes

 

drum

drum circumference)

 

 

 

 

 

 

intervals?

 

 

 

 

 

 

 

 

Scratch and Dirt

Are the horizontal stripes

 

Replace the fuser unit.

5

on the heat roller

at 78.5 mm (heat roller

Yes

 

 

 

circumference) intervals?

 

 

 

 

 

 

 

 

HVPS PCB

Is the problem solved

 

Replace the HVPS PCB

6

failure

after replacing the

Yes

ASSY.

 

 

HVPS PCB ASSY?

 

 

 

 

 

 

 

 

Main PCB failure

Is the problem solved

 

Replace the main PCB

7

 

after replacing the main

Yes

ASSY.

 

 

PCB ASSY?

 

 

 

 

 

 

 

Bottom surface

of Paper tray

Paper tray ground terminal.

Fig. 3-7

3-52

Confidential