Service manual
Section I: Imagesetter
Alignment 5-15
2. Remove all supply cassettes.
NOTE: It does not matter which way the spindle selector is left;
toward A or B works equally as well.
3. Connect the serial cable from the imagesetter to the PC, and launch the
AVDIAG Program from your PC.
4. Select Align and then DEC Machine Parameters.
The following dialog appears:
Loading Dec Machine Parameters into memory.
5. Select Y in the dialog box.
6. When loading completes, select DEC (Media).
7. Set the S-Feed Current in the second column (for FILM/Plate 3-5.5, M4-
Max) to the lowest setting for the S-Feed Current used on paper (Min-MP).
Make a note of the previous setting so that it can be restored at the end of
this procedure.
8. Select Align and then SGM-A/B Mod Align.
Two commands appear at the bottom of this menu. Use the commands to
turn Modulation on and off, and to set the S-Current Offset field. This field
has a range of -15 to +15.
9. Start with a value of 0 in the S-Current Offset field.
10. Turn Modulation on by first moving the cursor with the arrow keys until
the ON field highlights, then press ENTER.
The imagesetter drives the supply feed motor in alternating directions,
changing rapidly.
11. Observe the action of the feed rollers.
The rollers will be rotating back and forth. If either direction is more pow-
erful than the other, you will end up with a net movement in one direction.
The objective is to make adjustments to the S-Current Offset field to mini-
mize the differential movement. It is easiest to do this by putting a mark on
one of the rollers.
12. Note the direction of the overall movement of the rollers.
If the bottom roller moves in the direction that would move media back
into the supply cassette, make a negative field adjustment. Make a positive
field adjustment, if the bottom roller moves in the direction that pushes the
media into the drum area.
13. Turn off the Modulation, make the field adjustment, then turn the Modula-
tion back on. Repeat this process until you have the setting that causes the
least overall movement in the rollers.