Toshiba DP1610
Troubleshooting. Image. 14 Faded image (low density, abnormal gray balance), Background Fogging
(14) Faded image (low density, abnormal gray balance)
| Step | Cause/Defect area | Check items | Measures |
|---|---|---|---|
| 1 | Toner empty | "ADD TONER" symbol flashing? | Replace toner cartridge. |
| 2 | Transfer charger unit | Transfer charger unit securely installed? | Re-install transfer charger unit securely. |
| 3 | Transfer charger wire cut off? | Replace transfer charger unit. | |
| 4 | Process unit drive system | Is auger gear of process unit driven when the PU pulley is manually rotated clock wise? | Replace process unit. |
| 5 | Toner cartridge | Any abnormalities in toner cartridge? | Replace toner cartridge. |
| 6 | Process unit (developer) | Magnetic roller pressure mechanism working normally? | Check mechanism. |
| 7 | Process unit (main charger) | Main charger dirty? | Clean main charger wire, replace process unit or charger wire. |
| 8 | Process unit (drum) | Film formed on drum surface? | If problem persists, replace process unit or drum. Note: Never touch drum surface. |
| 9 | DEV. motor assembly (terminal) | Have harnesses been connected to designated terminals of DEV. motor assembly correctly? (Refer to chapter 12.6 of Service Manual.) |
Re-install the harness. |
| 10 | HVPS | High-voltage output defective? | Adjust output from HVPS, or replace defective HVPS. |
| 11 | 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 transfer charger unit. |
(15) Background Fogging
| Step | Cause/Defect area | Check items | Measures |
|---|---|---|---|
| 1 | Density reproduction | Image density reproduction defect? | Adjust density. |
| 2 | Main charger | Main charger dirty? | Clean main charger wire, replace process unit or charger wire. |
| 3 | Process unit (developer) | Magnetic roller pressure mechanism working normally? | Check mechanism. |
| 4 | Process unit (drum) | Film formed on drum surface? | If problem persists, replace process unit or drum. Note: Never touch drum surface. |
| 5 | HVPS (main charger/ developer bias/ 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. |