The following procedures for the use of a new measurement kit
(Catalog Number 509G35525) are designed to help overcome distortions of drum bow and
linearity on the Dolev 800 Imagesetter. The kit uses a modified microscope
and laptop computer to make adjustments.
Note the following facts about drum bow and linearity:
Beam parallelism effects bow and linearity.
Beam concentricity does not effect bow and linearity.
The last static mirror and the dynamic optics are the major sub-assemblies causing bow and
linearity problems.
Bow and linearity errors are perpendicular (90o) to each other.
When the bow is maximal, linearity is minimal, and vice versa.
Magnetic tape and other media which include the file
GRID100.MEAS.
Connect the foot switch to the CCD I/F box.
Connect the flat cable between the microscope and the CCD I/F
box.
Connect the other two cables, ODD to ODD, EVEN to EVEN,
between the microscope and the CCD I/F
box.
Connect the RS-232 cable between the computer and the CCD I/F
box.
Connect the CCD I/F box power cord to a power source. Check
that the READY LED is lit.
Remove the master grid film, and the master grid diskette,
from the Master Grid box. Place the 7 mil film on top of the GRID100.MEAS film, on
the light table. The headline "T.L." should be in the top left corner of the
master grid film. All the other headlines should be right-reading up. The film has no
header.
Switch on the computer.
Install the operating software diskette into drive A.
Type a: and press <Enter>.
At the prompt a:> type: install and press <Enter>.
The program moves to the c: drive, to the directory \meas.
At the prompt d:\meas, type measure. You receive three
choices:
1. Measure grid
2. Analyze
3. Quit
On the following screens, select 1. Measure grid, Products
<Enter>, Dolev 800 <Enter>, Measurement <Enter>.
Type in the serial number found on the master grid film.
Select 1. Bow, or 2. Linearity.
Follow the instructions on the screen. (Remember, order of
measurement of bow and linearity is first bow, and then linearity.)
Allow the GRID100.MEAS film to rest on the table for 30
minutes after its removal from the processor.
Insert the master grid diskette into drive A.
Calibrate the microscope. The field of view of the microscope
is that part of the film visible through the hole in the target holder.
Place the microscope on the master grid film so that the
cross-hairs on the microscope target cover the cross on junction 23. This is near the cal
6 mm headline.
Look through the target holder hole: two calibration lines
should be visible.
Make sure that only the master grid film information is
visible through the field of view. If any part of the GRID100.MEAS film is visible, you
will receive incorrect results.
To calibrate the lines, press any computer key, or depress the
foot switch.
If the film is too large for the light table, cut the film
along the cutting line. The line is clearly marked along the middle of the film.
Place GRID100.MEAS, Section A on the light table with the
"T.L.A" headline in the top left corner, right-reading up.
Place the master grid film on top of the GRID100.MEAS film.
Use the targets on both films to align the films. The master grid film "T.L"
headline must be right-reading up in the top left corner, near the GRID100.MEAS film
"T.L.A" headline.
Tape the master grid film to the GRID100.MEAS film.
Follow the instructions on the monitor. The first row of
GRID100.MEAS, Section A is measured by master grid film junctions 1 to 7.
Measure the linearity (drum) direction of junctions 1 to 7,
and 41 to 47.
Measure the bow (lead screw) direction of junctions 1, 4, 7 to
11, 14, 17 to 21, 24, 27 to 31, 34, 37 to 41, 44 and 47.
Place GRID100.MEAS, Section B on the light table with the
"T.L.B" headline in the top left corner, right-reading up.
Place the master grid film on top of the GRID100.MEAS film.
Use the targets on both films to align the films. The master grid film "T.L"
headline must be in the top left corner, near the GRID100.MEAS "T.L.B" headline.
Tape the master grid film to the GRID100.MEAS film.
Follow the instructions on the monitor. The first row of
GRID100.MEAS, Section B is measured by master grid film junctions 101 to 107.
Measure the linearity (drum) direction of junctions101 to 107.
Measure the bow (lead screw) direction of junctions 101, 104,
107, 8, 9, 10, 11, 14, 17 to 21, 24, 27 to 31, 34, 37 to 41, 44 and 47.
Look for the message, Measurement end. Quit to analyze, on the
monitor.
Press <Esc> twice.
Select Quit. You are now returned to the screen 1. Measure
grid, 2. Analyze, 3. Quit.
Select 2. Analyze. The bow graph and correction instructions
are displayed. Reminder: Write down the bow graph and the correction instructions before you
select 1. Measure grid. When1. Measure grid is selected, previous data results of the bow
graph are deleted.
Select <Enter> to move to the next screen.
Follow the correction instructions. Repeat the process until
the bow results are within the tolerance. When the results are acceptable, perform
linearity measurement.
Complete the same procedure for the bow measurement.
Measure the junctions listed below.
For GRID100.MEAS, Section A, measure the linearity(drum)
direction and the bow (lead screw) direction of junctions 1 to 7, 11 to 17, 21 to 27, 31
to 37 and 41 to 47.
For GRID100.MEAS, Section B, measure the linearity (drum)
direction and the bow (lead screw) direction of junctions 101 to 107, 11 to 17, 21 to 27,
31 to 37 and 41 to 47.
When the message Measurement end. Quit to Analyze appears on
the monitor, press <Esc> twice.
Select Quit. You are now returned to the screen 1. Measure
grid, 2. Analyze, 3. Quit.
Select 2. Analyze. The total linearity error is displayed.
This error is corrected by the software.
The system prompts you to insert a diskette; and then creates
a correction table file: CORRGRID.PRM.
Copy the file to the imagesetter. Repeat the procedure until
linearity is within the tolerance.
In the computer, type cd/meas, <Enter>, measure,
<Enter>.
Choose 1. Measure Grid, Diagnostics, <Enter>, Test
Focus, <Enter>.
Place the microscope on the CAL lines.
Follow the instructions on the screen, and check that the rise
gap is within the tolerance (less than 15 pixels). The message on screen reads:
"Number of pixels in ascending edge of first/second line."
If focus test passes, continue to measure magnification using
diagnostics. If the focus test fails, follow the instructions here to fix the focus.
Open the CCD I/F box top cover. Connect the video test point
and the AGND = analog ground to an oscilloscope.
Place the microscope on the master grid film in the following
way (emulsion-side down)
Look at the signal on the scope. The signal edge should be as
sharp as possible, and should contain as few pixels as possible.
If the signal shows de-focus, or poor focus quality, open the
upper two set screws of the microscope, then raise or lower the top tube (CCD assy) till
the signal shows good focus quality. Tighten the upper two set screws. Make sure that the
two signs on the top and main tubes coincide.
In the computer type: cd\meas <Enter> measure
<Enter>.
Choose 1. Measure grid, diagnostics, <Enter> meas. gap.
The microscope should remain as described in "Focus Test". Follow the
instructions on the screen. The gap should be 530±10 pixels. If the gap is not within the
tolerance, open the lower two set screws, then raise or lower the main tube till the meas.
gap test in diagnostics succeeds (530±10 pixels).
Perform the focus test through the diagnostics again
Port error (computer
error).
Cannot open comm1 port.
Computer error - reset
the computer and try again, or replace computer
Communication problem:
check all cable connections and power.
Got nothing/part/bad data.
No communication established.
Missing data.
No acknowledge.
Communication problem try again
Check if ready led is
lit (CCD I/F box).
Check if RS232 cable is connected between CCD I/F box and computer.
Power failure occurred - try again
computer has battery
Run diagnostics for CCD I/F box (from the main pop-up menu).
ROM
fail.
CNY fail.
SEQ. fail.
MEM. fail.
ALU fail.
Check if ready led is
lit (CCD I/F box).
Illegal answer
Wrong value, try again.
There are only certain
legal answers:
choose only one of them: follow screen instructions
This point is not
measured in grid A (or B).
Only linearity direction is measured now.
The junction you
measured does not belong to the grid part you are measuring now. For the correct
junctions' list refer to the above instructions.
Align microscope more
precisely on cross.
Error in microscope position.
Check alignment of microscope.
The cross near each
junction should fit inside the microscope target hairs.
Wrong distance
measured - check if microscope is located on cal lines.
If microscope is
located on cal lines and error message still appears, check film cleanliness, and/or focus
quality.
Bad data: line width
error (cal lines).
Place microscope more
precisely on cal lines.
Focus error.
Perform focus test
through diagnostics.
Bad data - check film
cleanliness.
Check film
cleanliness.
Bad data: line width
error (measured grid line).
Check measured grid for line width 0.05 ± 0.01 mm.
Bad data: line width error (master grid line).
Check master grid for line width 0.15 ± 0.015 mm.
Follow screen
instructions.
Error found in barcode
area. You may enter barcode manually.
Press <Enter> to insert barcode, or any key to measure again.
Follow screen
instructions.
Missing line.
Missing measured grid line.
Distance error.
Check the following possibilities:
Missing or bad measured line.
Missing or bad master grid line.
Film not clean in measure area.
Constant line and measure line overlapping.
Cal. measurement problem. Restart measurement.
Follow the
possibilities listed under "distance error."
Light intensity too
weak:
Open lens iris and try again.
Follow screen
instructions.
In TEST LOOP, if there is any error message, check computer,
CCD I/F box, and
communication between them.
