Toshiba e-Studio 4515AC
Troubleshooting. Image 2. Uneven pitch and jitter image
Symptoms
Occurs cyclically at right angles to paper feeding direction
Procedure
| Cause/Section | Step | Check Item | Measures |
|---|---|---|---|
| 1 | Test printing (A3/LD) | Output the built-in halftone and grid patterns | |
| Drum | 2 | Are there uneven pitches of approx. 94 mm? | Replace the drum. |
| 3 | Is there any damage on the drum surface? | Clean or replace the drum. | |
| Drum drive | 4 | Is there any dent, damage or deformation on the gears of the drum drive unit? | Replace the gears of the drum drive unit. |
| Drum rotation abnormality | 5 | Check the drum TBU motor operation in the test mode (FS-03 TEST MODE) to see if there is any rotation abnormality of the drum. | Reconnect the connectors. Replace the harnesses. Replace the LGC board. Replace the drum TBU motor. |
| Developer sleeve | 6 | Are there uneven pitches of approx. 28 mm? | Replace the developer sleeve. |
| Inadequate drum TBU motor rotation speed | 7 | Check the value set for drum TBU motor rotation speed. (Is the value significantly different from the default value?) | Reset drum TBU motor speed to 128. |
| Drum coupling | 8 | Loose coupling, damage, deformation | Replace the couplings. |
| Transfer belt | 9 | Deformation or damage of the transfer belt | Replace the transfer belt. Check the halftone pattern. (Uneven pitch: approx. 56 mm) |
| 10 | Stain or damage of the drive roller | Clean or replace the drive roller. Check the halftone pattern. (Uneven pitch: approx. 56 mm). |
|
| 11 | Large driving load due to the peeling of the cleaning blade | Replace the cleaning blade. | |
| Transfer belt drive | 12 | Are there uneven pitches of 0.63 mm? | Replace the TBU gears. |
| Feeding drive | 13 | Are there uneven pitches of approx 2.0 mm or 0.79 mm, 1.25 mm? | Replace the gears of the feed/transport gear unit and the first drawer transport clutches. |
| 14 | Is there any dent, damage or transport clutches. deformation on the gear of the feed/transport gear unit and the first drawer transport clutch (CLT5 or CLT6)? | ||
| Fusing drive | 15 | Are there uneven pitches of approx. 94 mm? | Perform “Fine adjustment of fuser belt rotational speed” (FS- 05-4529-0, 3, 4, 7). |
| 16 | Is the fuser unit properly installed in the equipment? | Check if the fuser unit is installed correctly. | |
| 17 | Is there any dent, damage or deformation on the drive gears of the pressure roller? | Replace the drive gear of the pressure roller. | |
| EPU drive | 18 | Are there uneven pitches of approx. 0.78 mm? | Replace the developer drive unit, developer sleeve and drive gears of the mixer. |
| 19 | Is there any dent, damage or deformation on the developer drive unit, developer sleeve and drive gears of the mixer? | ||
| 2nd transfer roller | 20 | Are there uneven pitches of approx. 75 mm? Is there any deformation to the 2nd transfer roller? Since the 2nd transfer roller is always in contact with the transfer belt, the roller may creep if the power has not been turned on and the equipment left unused for a long time (1 month or more), causing an uneven pitch. | Replace the 2nd transfer roller. This problem may occur on thick paper or the image on the back side of the paper in duplex printing. |