1. General Adjustments – Copying, Printing and
1.2.1 To Adjust the Blurred or Grained Image
(1) Enter adjustment mode [05]. Change the values for codes [234/236/237/238/239] to adjust the transfer (2nd transfer) roller bias output.
(Adjust the offset voltage of transfer roller bias so as to optimize the halftones.)
•The code to use varies, according to a type of paper used. Adjust the value for the [05] code corresponding to the paper type for which you would like to improve the image quality. Set the value within a range of "2" to "8" to optimize the halftones.
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| Value | Acceptable |
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| recommended | value range |
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| Black |
| Front |
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| Plain |
| Back |
| 1 |
| 2 to 8 | 0 to 10 | 5 |
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| paper | Full color |
| Front |
| 2 |
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| Back |
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| Black |
| Front |
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| 0 |
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| Thick 1 |
| Back |
| 1 |
| 2 to 8 | 0 to 10 |
| 5 |
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| Full color |
| Front |
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| Back |
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| Thick 2 | Black |
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| 0 |
| 2 to 8 | 0 to 10 |
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| 1 |
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| Thick 3 | Black |
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| 2 to 8 | 0 to 10 |
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| 1 |
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| OHP | Black |
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| 2 to 8 | 0 to 10 |
| 5 |
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| 1 |
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*"Front" refers to the printed side in simplex mode or the side that is delivered facing upwards in duplex mode. "Back" refers to the printed side that is delivered facing downwards in duplex mode.
*The table below shows you the acceptable paper weight for the paper types.
Paper type | Acceptable paper weight | |
Plain paper | 64 to 80 g/m² | 17 to 20 lb. Bond |
Thick 1 | 81 to 105 g/m² | Max. 28 lb. Bond |
Thick 2 | 106 to 163 g/m² | Max. 43 lb. Bond / 90 lb. Index |
Thick 3 | 164 to 209 g/m² | Max. 55 lb. Bond / 110 lb. Index |
•After adjusting the transfer roller bias output, perform the automatic calibration.
*For further information regarding the procedures, refer to procedure (2) in 1.1 To Obtain a Darker Image.
<Hint> The transfer voltage increases as the set value is increased. It is usually desirable that the set value be decreased to obtain a clearly highlighted area.
After performing the adjustment, print and check the image quality.
If further image quality adjustments are still necessary, use the next procedure.
1.2
