Toshiba DP1610
Troubleshooting. Image. 08 Black banding (at right angles to feeding direction), White Spots
(8) Black banding (at right angles to feeding direction)
| Step | Cause/Defect area | Check items | Measures |
|---|---|---|---|
| 1 | Process unit (main charger) |
Main charger wire dirty or deformed? | Clean main charger wire, replace process unit or charger wire. |
| 2 | Charger wire terminals/grid terminals (process unit) and corresponding terminals (main body) stained? |
Clean terminals. | |
| 3 | Process unit (Drum) | Deep scratch on drum surface? | Replace process unit or drum. |
| 4 | Fuser unit | Dirt or scratches on heat roller surface? |
Clean or replace heat roller? |
| 5 | HVPS (main charger/transfer charger) | High-voltage output defective? | Adjust output from HVPS, or replace defective HVPS. |
| 6 | If problem persists after measures are applied, or there is no problem found in above check, follow procedure described in right column. | Replace process unit or fuser unit. |
(9) White Spots
| Step | Cause/Defect area | Check items | Measures |
|---|---|---|---|
| 1 | Transfer charger unit | Foreign matter on guide roller? | Clean guide roller. |
| 2 | Guide roller shaft grounded improperly? | Ground guide roller shaft properly by applying conductive oil. | |
| 3 | Transfer charger wire slacked? | Replace transfer charger unit. | |
| 4 | Transfer charger case deformed? | Replace transfer charger unit. | |
| 5 | Process unit (drum) | Any abnormalities on drum surface? | Replace process unit or drum. |
| 6 | Fuser unit | Toner on heat roller surface? Scratches on heat roller surface? |
Clean heat roller. If problem persists, replace heat roller. |
| 7 | Process unit (Developer) | Is toner running short? | Check to see toner sensor works properly, and then check toner replenishing procedure. |
| 8 | HVPS (main charger/ developer bias/transfer charger) | High-voltage output defective? | Adjust output from HVPS, or replace defective HVPS. |
| 9 | If problem persists after measures are applied, or there is no problem found in above check, follow procedure described in right column. | Replace process unit, transfer unit, fuser unit, or HVPS. |