1. Test overview.

This test checks that the light signal is correctly picked up on the blue channel of the RGB CCD.
The software will switch on the lamp and the RGB CCD will receive a signal that determines if the test is accepted or not.
If there is a problem on the blue CCD it could cause problems with Image quality or reduce the scanner output.

2. Test conditions.

This test relates only to the scanner only.
No film carrier must be present in the scanner to carry out this test.
No film is necessary for this test.
The acceptance of the test is automatic.
No parameter is saved saved.

3. Pre-requirements.

None.

4. Test realisation.

Click on " RUN " to carry out the test. The scanner switches on the lamp and the correct filter is used to complete the test.

• If a compatible 120 light 120 light source is installed:120 filter will be used.
• If a non-compatible 120 light source is installed: the Nega filter will be used.

The RGB CCD will use the blue channel to measure the light value and will display the results on the screen in the form of a curve, which represents the signal across the whole of the CCD.

5. Acceptation du test.

The blue curve corresponds to the signal seen by the blue channel of RGB CCD.
The cyan curves correspond to the upper and lower limits, as well as the ideal signal.
The CCD is shown here in a horizontal way : the top of the CCD is on the left, bottom on the right.
If a compatible 120 light source is installed :

• Pattern : The blue curve must be between the higher and lower cyan curves
• Score before adjustment : it is the average of the blue curve which must lie between 218 and 655.
• Minimum : the minimum of the blue curve must be higher than 153.
• Maximum : the maximum of the blue curve must be lower than 818.
• Dynamic : the ratio max / Min must be lower than 2,35.
• Noise : must be lower than 20.
• Dust : dust.
• Wave.

If a noncompatible 120 light source is installed :

• Pattern : The blue curve must be between the higher and lower cyan curves.
• Score before adjustment : it is the average of the blue curve which must lie between 278 and 835.
• Minimum : The minimum of the blue curve must be higher than 174.
• Maximum : The maximum of the blue curve must be lower than 1076.
• Dynamic : The ratio max / Min must be lower than 2,75.
• Noise : Must be lower than 20.
• Dust : Dust.
• Wave.

The test is passed if all criteria are correct.
Due to the heating up of the lamp it should be noted that certain values could change according to the lamp temperature.

6. Other affected tests.

If the signal is slightly outside the tolerances, none of the tests will really be affected. On the other hand, if no signal is read on RGB CCD, all tests can fail when an RGB image is scanned.

7. Trouble shooting.

If the signal is outside the higher or lower tolerance : This means that the light intensity is to low. First try changing the lamp. If this does not work try adjusting the position of the light source (There is a small amount of play to enable the light source to move slightly), also check that the filters are clean and are not damaged.
If the customer does not complain, the scanner can be left as it is.

If there is Dust : This could mean that there is dust between the lamp and the RGB CCD and move often than not near the CCD. First try to clean the lens and if this fails clean the CCD by pulling out the CCD PCB.