1. Présentation du test.

This test checks that the red channel of the RGB CCD correctly measures the light.
The software will switch on the lamp and the RGB CCD will receive a signal which determines if the test is passed of not.
If there is a problem on the Red 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 insertedin 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 filters is used to complete the test.

• If a compatible 120 light source is installed : A 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 Red 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. Test acceptance.

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

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

If a non-compatible 120 light source is installed.

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

The test is passed if all these critria are correct.
Due to the heating up of the lamp it should be noted that certain values can 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 RGB 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 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.
As an exception it is possible to accept a low Red CCD reading. To do this start the test CCD RED (NEGA) and et CCD RED (120).
However if the customer does not complain the scanner should be left as it was.

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