Toshiba 351C, 451C, e-STUDIO281c manual To Adjust the Copy Image Quality in Black Mode

2. Copier-specific Adjustments

2.6.1 To Adjust the Copy Image Quality in Black Mode

*You can start with any of the procedures. But it is recommended to perform the procedures in order, as listed below. You can use one procedure in conjunction with another. But if this changes the image quality more than required or loses effectiveness of the adjustment, restore the settings made in the previously used procedure to the original. Then perform the next procedure.

*Procedure (1) is used by the service technician, and by the user.

*Procedures (2) to (4) are used by the service technician only.

(1) Press the [IMAGE] button on the Control Panel. Press the [BACKGROUND ADJUSTMENT] button. Press the [LIGHT] button to decrease the background density.

After decreasing the background density, copy and check the image quality.

With the background density set to the minimum, if further image quality adjustments are still necessary, the service technician must use the next procedure.

(2) Enter adjustment mode [05]. Change the values for codes [600 to 602] to adjust the background density.

Original		[05] code	Value recommended	Acceptable		Default
mode				value range
Text/Photo	05-600		Set a value smaller than 5.	1 to 9	5
Text	05-601
Photo	05-602

*Set the value in increments of approximately 1, while checking the copy image until the optimum value is obtained.

After adjusting the background density, copy and check the copy image quality.

If further image quality adjustments are still necessary, use the next procedure.

(3) Enter adjustment mode [05]. Change the values for codes [590 to 592] to adjust the gamma curve balance of the low- and medium-density areas.

Original		[05] code	Subcode	Value recommended	Acceptable	Default
mode					value range
Text/Photo	05-590		0/1	Set a value smaller than 128.	0 to 255	128
Text	05-591		0/1
Photo	05-592		0/1

*Set the value in increments of approximately 20, while checking the copy image until the optimum value is obtained.

*The subcode varies, according to the area for which the density is adjusted. Refer to the table below and set the subcode for the area to be adjusted. The background density will vary, if the low- or medium- density area is mainly adjusted. Setting "2" for the subcode allows you to adjust the high-density area.

But it will not affect the background density. Therefore, never change the values for the high-density area.

Subcode	Area for the density to be adjusted
0	Low-density area
1	Medium-density area

After adjusting the gamma curve balance, copy and check the copy image quality.

If further image quality adjustments are still necessary, use the next procedure.

e-STUDIO281c/351c/451c 2.6