Defective area |
Step |
Check items |
Prescription |
Laser optical unit |
1 |
Is there a foreign matter or stain on the slit glass? |
Remove the foreign matter or stain. |
Main charger grid |
2 |
Is there a foreign matter or dew on the charger grid? |
Remove the foreign matter. |
Transfer charger wire |
3 |
Is there any foreign matter or stain on the transfer charger wire? |
Clean the transfer charger wire. |
Developer unit |
4 |
Is the developer material transported properly? |
Remove the foreign matter if there is any. |
5 |
Is there a foreign matter or dew on the drum seal? |
Remove the foreign matter or dew. |
6 |
Is the upper drum seal of the developer unit in contact with the drum? |
Correct the position of the drum seal or replace it. |
Drum |
7 |
Is there a foreign matter on the drum surface? |
Replace the drum. |
Transport path |
8 |
Does the toner image contact with any foreign matter before the paper enters the fusing section after the separation? |
Remove the foreign matter. |
Discharge LED |
9 |
Is any of the discharge LEDS off? |
Replace the discharge LED. |
Scanner |
10 |
Is there a foreign matter on the light path? |
Remove the foreign matter. |
11 |
Are the original glass (especially the position of shading correction plate) mirror and lens dirty? |
Clean them. |
Cleaner |
12 |
Is there any foreign matter, which contacts the drum on the cleaner stay? |
Remove the foreign matter. |
Defective area |
Step |
Check items |
Prescription |
Main charger |
1 |
Is there a foreign matter on the charger? |
Remove the foreign matter. |
2 |
Is the connector in proper contact with the terminal? |
Clean or adjust the terminal. |
Drum |
3 |
Is there any abnormality on the drum surface? |
Replace the drum. |
Discharge LED |
4 |
Does the discharge LED light normally? |
Replace the discharge LED or check the harness and the circuit. |
Developer unit |
5 |
Is the developer sleeve rotating normally?
Is there any abnormality on the sleeve surface? |
Check the drive system of the developer unit, or clean the sleeve surface. |
Drive system |
6 |
Are the drum and scanner jittering? |
Check each drive system. |
High-voltage transformer (Main charger / Developer bias / Transfer charger) |
7 |
Is the high-voltage transformer output defective? |
Adjust the output, or replace the transformer. |
Transfer charger |
8 |
Is any foreign matter such as paper shred sticking to the transfer charger wire? |
Remove the foreign matter from the wire. |
Feed system |
9 |
Is the aligning amount proper? |
Adjust the aligning amount. |