Ricoh B264 Service Manual page 285

4307* APS Sensor Output Display
Determines whether or not the original size is detected while the exposure lamp
lights during initialization.
4428 Scanner Adjustment DFU
44281 Flag Display
44282 Start
Flag Reset
44283
4901* SBU Setting DFU
4995 Scanner Evaluation Mode DFU
4550* Scanner: Text: Print
These SP codes set the MTF (Modular Transfer Function*
scanning.
Note:
• As a general rule, adjust the level (coefficient) before adjusting the strength.
• Raising the brightness or contrast level may increase the occurrence of moiré
4550 1 MTF Filter Level: Main Scan
4550 2 MTF Filter Level: Sub Scan
4550 3 MTF Filter Strength: Main Scan
4550 4 MTF Filter Strength: Sub Scan
4550 5 Smoothing Filter
4550 6 Brightness (Not Used)
4550 7 Contrast (Not Used)
4550 8 Isolated Dot Removal
*1 When the CCD converts the original image to electrical signals, the contrast is reduced due to
the influence that adjacent white and black pixels have on one another as a result of lens
properties. Typically, you will see very narrow width and spacing between black and white areas.
MTF corrects this problem and emphasizes image detail.
SM
SERVICE PROGRAM MODE TABLES
0: Original size detection at power on disabled.
1: Original size detection at power on enabled
Set the MTF coefficient for main/sub scan
directions.
[0~15/8/1]
0: Weakest 8: Default
Set the MTF strength for main/sub scan
directions.
[0~7/4/1]
0: Weakest 4: Default
Selects the level of smoothing for originals that
contain dithered images.
[0~7/0/1]
0: Default (Off) 7: Strongest
Sets the overall brightness of the image.
[1~255/128/1]
1: Weakest 128: Default
Sets the overall contrast of the image.
[1~255/128/1]
1: Weakest 128: Default
Sets the level of independent dot erasure to
improve the appearance of background.
[0~7/0/1]
0: Default (Off) 7: Strongest
5-21
1
) for text printed after
15: Strongest
7: Strongest
255: Strongest
255: Strongest
B264/B265