14
4.3 Advanced Tests
OPEN-LOOP CHECK
This test is for the initial setting of the control parameters used in the Closed-loop Control ON:
Absolute mode and is seldom needed by the user; however, it is provided as a diagnosis and
adjustment tool in case that the platen accuracy can not be corrected by only utilizing the Plot
Calibration test. In such case, it is recommended that the user contact the factory technical
support before performing the OPEN-LOOP CHECK test. The procedure is listed below for
reference:
1. Enter this test mode by pressing the ENTER key when “OPEN-LOOP CHECK...” is
displayed under SYSTEM menu, SYSTEM TEST item.
2. Once in the test mode, the PARM+ or PARM- key may be used to scroll through the
“number of slots” choices among 640, 1280 and 1920. Note that 32 slots are approximately
one inch long. Press the ENTER key to select the desired test length (for example, 640 slots
~20”). The ITEM key may be used to exit this test mode.
3. Selection of different image patterns (normal grid, filled or blank interior as in the Platen
Accuracy test) is also available. Press the ENTER key to run the test which would output an
image of the selected length and pattern.
4. After the output image is printed, the message “W=xxxx L=yy S=zzzz” will be displayed
(W and L indicate the number of window slots and of lines used for internal diagnosis. S is
the total number of scan lines of the printed image. The displayed W value should be equal to
the number of test slots selected by the user. The user may ignore these numbers unless there
is an abnormality in the platen accuracy adjustment. In such case, please contact the factory
technical support.) . Press the CUT/PARM+ key to cut off the output image.
5. Use an accurate scale to measure the length of the printed image.
6. After cutting off the output image, the nominal test length (such as 20.000” when # of
TestSlots=640 was selected) is first displayed. The user may use the PARM+ or PARM-
key to enter the actual measured length digit by digit. Use the ENTER key to move the
cursor pointing to the digit to be entered.
7. After entering the last digit, press the ENTER key.
8. If the user has entered an incorrect number carelessly, press the PARM+ or PARM- key to
restart the process of entering the measured length; else, press the ENTER key.
9. After the measured length is entered, the TechSetter will adjust its internal platen accuracy
parameter and save it in the nonvolatile memory to be used for both media types.
10. After performing the OPEN-LOOP CHECK test just once, the user may go to the PLOT
CALIBRATION test for fine adjustments.
The OPEN-LOOP CHECK is to be performed on only one type of media (either paper or film).
After the OPEN-LOOP CHECK the user should run PLOT CALIBRATION on both media types
(paper and film) to fine tune the control parameters for each media type. DO NOT perform
OPEN-LOOP CHECK for the other media.
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