AGFA Avantra 36/44 Service Manual page 240

Avantra 36/44 Service Manual
The output copy consists of two focus patterns (vertical and horizontal)
divided by five horizontal black bars. The top pattern is the vertical focus
and the bottom pattern is the horizontal focus. See Figure 5-1.
The header tells you the starting point, which is defaulted to -280 for each
focus pattern. The increment is defaulted to 40. These can be changed in
the Special Arrays menu in PC Imager; however, these values should work
for most systems. Do not change the 120 value.
15. Before reading the output, mark each horizontal line set using a pen.
The first set of line patterns above the five black horizontal bars is -280.
Each set of line patterns above -280 has its value decreased by the incre-
ment 40; i.e., the second set of line patterns above -280 would be -240, the
third -200 until the top set, which should be +80, is reached.
16. Mark the bottom set of line patterns in the same way.
The bottom set of line patterns is -280. Mark each set of line patterns until
the top set is reached, which should be just below the five black horizontal
bars. This last set should be +80.
17. Make five readings for each focus pattern for a total of 10 readings.
Start with the top (vertical) pattern. Every place there is a black horizontal
bar (starting at -280) move up until you get to a set of line patterns that are
equal. The patterns start out dark to light but eventually come equal. If the
crossover point is between two sets of pattern lines then choose the value
between them. For example - if the crossover happens between -160 and -
120 then choose -140. Write this value on the output copy. Every place
there is a horizontal black bar you must do a reading. You should now
have five numbers.
18. Do the same for the bottom (horizontal focus) pattern. Start at the bottom
and read up. Again make five readings, one at each horizontal black bar.
NOTE: Note: You may notice that the crossover occurs twice when
doing the horizontal focus. The first one occurring close to -
280. This set of patterns will be dark, but they do look equal.
This is because both are out of focus. The crossover should
occur further up the focus pattern.
When completed you should have ten numbers.
19. Add the 10 numbers and divide by ten.
The number derived is the new focus position value. This value, if different
than the one in Step 5, must be loaded into the systems Dec. Machine
Parameters.
20. Exit PC Imager and repeat Steps 2 to 5 above.
21. Cursor to focus position and enter new focus position number from Step 19.
22. Press ESC. Exit AVDIAG with a Soft Reset.
5-8 Alignment