7. If the mean value is improper, select the [4-01] screen and change the flash setting step with
the value change keys (▲▼) on the process control OFF screen. Changing one step will
change approximately 25 volts in the AID reference voltage.
8. Press the Process Control ON key on the screen and be sure that all shift steps are 0. Then,
select the [4-03] screen again and repeat steps 4 to 7.
NOTE
• When the correct flash setting step is obtained, set the value of the actual VL (measured value) as
the target VL. During the flashing on the [4-03] screen, the actual VL shows the value that should
be the target for the VL if the flash output is proper. This makes it easier to obtain the target VL and
VD values. (You cannot know the target VD by doing the flashing 10 times on the [4-03] screen. This
is because the VD is measured and corrected after flashing 20 times.)
• As VD and VL are related, the measured AID reference voltage for the black (or white) area of the
PC-1 chart may change when the flash (or grid) step setting is changed. Therefore, make the
following checks and reset the value if the proper flash and grid setting steps have deviated.
1) Repeat steps 3 to 9 of the grid step setting.
2) Repeat steps 1 to 7 of the flash step setting.
3) Set the value of the actual VL (measured value) as the target VL when the correct flash setting
step is obtained.
3. Target VL and VD setting
The correct flash and grid setting steps have been set in the preceding procedures. In this
procedure, read with the [4-01] screen what voltages of the OPC potentials are produced for the
black and white patterns on the back of the original scale, and set them as the target VL and VD.
After setting the targets, the machine will modify the flash and grid outputs so that the actual VL and
VD match the target VL and VD.
1. Place a sheet of A3 (or larger) white paper on the exposure glass, near the original scale.
(This is to prevent change of reflectivity from the white-and-black pattern by a change of
original density near the pattern.)
2. Select the [4-01] screen.
3. Press the Process Control OFF key, then press the ON key to reset all shift steps to 0.
4. Press the Start key, and press the Clear/Stop key immediately after the 18th flash. The ma-
chine stops after 20 flashes. (This is because the flash output compensation is applied just
after flashing 10 times and the grid output compensation is applied just after 20 times.)
5. Read the actual VL (measured value).
6. Set the actual VL value as the target VL using the value change keys (▲▼) (10 volts per
step). If the actual VL is outside of the target VL adjustable range, set the closest value, and
repeat steps 3 to 8 once again after doing step 8.
7. Read the actual VD (measured value).
8. Set the actual VD value as the target VD using the value change keys (▲▼) (10 volts per
step). If the actual VD is outside of the target VD adjustable range, set the closest value and
repeat steps 3 to 8 once again.
Setting A 1 July 1994
5-6
To Next Page
Loading...
