1. Test overview.

This test checks that the green channel of the RGB CCD correctly measures the light.
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 green CCD it could cause problems with Image quality or reduce the scanner output.

2. Test conditions.

This test only relates to the scanner only.
No film carrier must be inserted 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.

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 are used to complete the test.

• If a compatible 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 green channel to measure the light value and will display the results on the screen in the form of a curve that represents the signal across the whole of the CCD.

5. Test acceptance.

The green curve corresponds to the signal seen by the green channel channel of RGB CCD.
The cyan curves corresponds to the higher and lower limits, as well as to the ideal signal.
The horizontal 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 120 light source is installed.

• Pattern : the green curve must be between the lower and higher cyan curves.
• Score before adjustment : The green curve average must lie between the following limits 218 and 743.
• Minimum : the minimum of the green curve must be higher than 153.
• Maximum : the maximum of the green curve must be lower than 906.
• Dynamic : the ratio max / Min must be lower than 2,35.
• Noise : must be lower than 20.
• Dust : dust.
• Wave

If a non-compatible 120 light source is installed.

• Pattern : the green curve must be between the higher and lower of the cyan curves
• Score before adjustment: The green curve average must lie between the limits of 278 and 946.
• Minimum: the minimum of the green curve must be higher than 174.
• Maximum: the maximum of the green curve must be lower than 1188.
• 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 these 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 be really affected. On the other hand, if no signal is read on CCD, all tests, where an RGB image is scanned, can fail.

7. Trouble shooting.

If the signal is outside the higher or lower tolerance : This means that the light intensity is too 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 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.