Toshiba e-Studio 5540C
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 patternsFor the following checks. For the following checks |
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| 2 | Are there uneven pitches of approx. 188.5 mm? | Perform procedures 5, 6 and 7. | |
| Are there uneven pitches of approx. 26 mm? | Perform procedure A. | ||
| 3 | This jittery image occurs in certain positions from the leading edge of the paper when the continuous printing is performed. This occurs at the position 178.277mm from the edge of the image when printed in black, 283.382mm in cyan, and 388mm in magenta. | Perform procedures 8, 9 and 10. Jittering caused by the impact of the paper going into the 2nd transfer section. |
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| 4 | This jittery image occurs in certain positions from the leading edge of the paper on the second and subsequent pages when continuous printing is performed. The position of the jittery image varies depending on the copying speed, paper size, and color. | Perform procedures 8 and 11 Jittering caused by the impact of the paper passing through the registration roller and 2nd transfer roller |
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| Drum | 5 | Is there any damage or foreign matter on the drum surface?. | Clean or replace the drum. Replace the drum first, because in some cases, scratches cannot be visually checked. |
| Drum drive | 6 | Is there any dent, damage or deformation on the gears of the drum drive unit? | Replace the drum drive unit. |
| A | Is there any dent, damage or deformation in the motor gear section of the drum drive unit? | Replace the drum motor. | |
| Fuser belt | 7 | Check if the fuser belt is scratched or deformed.) | Replace the fuser belt. |
| Transfer belt unit | 8 | Is the transfer belt rotating correctly? | Install the transfer belt drive motor correctly. |
| 2nd transfer unit | 9 | Check if there is no abnormality on the surface of the 2nd transfer roller. | Replace the 2nd transfer roller. |
| 10 | Check if any white void in the halftone occurs at the same time. | Apply the measure following “25.5.27”. | |
| Transportation speed | 11 | Check if an abnormal value is set for the transportation speed. Drum motor 05-4520 (0 to11) Registration motor 05-4523 (0 to 11) Fuser roller 05-4529 (0 to 11) |
Change the value back to the default. |
| Transfer belt | 12 | The density stripe which occurs once every few copies in certain positions in the primary scanning direction. Check if the belt surface is scratched. The rotation period of the belt is approx. 1118mm. |
Replace the transfer belt. |
| Transfer belt cleaning facing roller | 13 | Density belt pattern of 105mm pitch | Clean or replace the transfer belt cleaning facing roller. |
| Developer sleeve | 14 | Is the pitch of the density fluctuation 43.5mm? | Replace the developer sleeve |
| Jitter (1.9mm pitch) | 15 | Density stripe pattern (jitter) of 1.9mm pitch in Black mode printing | Replace the developer sleeve. Replace the 2nd transfer drive unit. Replace the LSU. |
| Jitter (1.35mm pitch) | 16 | Density stripe pattern (jitter) of 135mm pitch in cyan and magenta | Check if the laser optical unit cooling fan (front) is installed properly. Replace the fan if there is an abnormality. |