SERVICE PROGRAM MODE22 March 1996
Mode No.
FunctionSettings
Class 1 Class 2
4903 *1 *GA 3 SettingSelects the strengths of the MTF and0 ~ 255
(Filter Level)smoothing filters.0
bit 7, 6: Letter Mode (MTF)
00: Normal 01: Weak 10: Weaker
11: Weakest
bit 5, 4: Generation Mode (MTF)
00: Normal 01: Weak 10: Weaker
11: Weakest
bit 3: Not used
Keep at "0"
bit 2: Letter/Photo Mode (Smoothing)
0: Sharp 1: Smooth
bit 1: Photo Mode (MTF)
0: Weak 1: Strong
bit 0: Photo Mode (Smoothing)
0: Smooth 1: Sharp
Input the setting for all 8 bits at once as a
decimal value.
(e.g. To set the MTF filter strength of the
the generation mode to ?weak?, the input
value should be 16 as shown below,
assuming all other parameters are at the
?zero? setting.
00010000 ? 16
The type of filter used in Photo mode
depends on the setting of SP4904-3.
2 *GA 3 SettingSelects the coefficients and strengths0 ~ 16 of
(Filter Mode)the MTF filter and smoothing filter1 /step.
Do not change the value.3
3Not used
4 *GA 3 SettingChanges the threshold level for dot0 ~ 255
(Whitescreen detection processing. 1 /step
Threshold)Do not change the value.80
5GA3 SettingSelects whether the copy image is0: always Normal
(Full Size)in the full size mode even if theOperation
magnification ratio has been changed.1: Always full
This SP mode is used for checking thesize mode
magnification function in the main scan
direction, which is performed by the GA3
chip.
6GA 3 SettingPrints the test pattern for the GA3 or selects one of the
(Test Patternfollowing video data outputs for printing.
Output) 0. Normal
1. Test pattern print out
2. Skips the magnification processing.
3. Skips the filter processing
4. Skips the GA3 functions
This SP mode is used for checking the GA3 functions.
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