All black

Step

Cause

Check

Result

Remedy

 

 

 

 

 

 

 

 

 

 

 

Corona wire

Are the electrodes on

 

Clean both electrodes.

1

failure

the drum unit and

Yes

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

 

 

machine body dirty?

 

 

 

 

 

 

 

2

 

Is the corona wire

Yes

Replace the drum unit.

 

damaged?

 

 

 

 

 

 

 

 

 

 

 

Scanner harness

Is the scanner harness

 

Reconnect the scanner

3

of the laser unit

of the laser unit

No

harness of the laser unit.

connection

connected securely?

 

 

 

 

 

failure

 

 

 

 

 

 

 

 

 

FG harness

Is the FG harness ASSY

 

Reconnect the FG harness

4

ASSY connection

between the laser unit

No

ASSY between the laser

failure

and main PCB ASSY

unit and main PCB ASSY

 

 

 

 

connected securely?

 

securely.

 

 

 

 

 

 

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?

 

 

 

 

 

 

 

 

Laser unit failure

Is the problem solved

 

Replace the laser unit.

7

 

after replacing the laser

Yes

 

 

 

unit?

 

 

 

 

 

 

 

3-50

Confidential