1. Présentation du test.

This test is used to verify that the high LED (red) and low (green) of the film carrier lights up the CCD correctly so that the reading of the barcode (DX) is done correctly. A general check of the light level will be carried out.
For that, the 2 LEDS will switch on and the CCD will pick up the light through the barcode lens and control the signal.
If there is an unspecified problem on the LEDS, the reading of the code DX (exposure film number and of the APS cassette number) can be misinterpreted.

2. Test conditions.

This test relates to the APS film carrier inserted in the scanner.
The APS 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 execute the test. The 2 LEDS will switch off then switch on to light up the CCD which will pick up the light. Curves will be displayed, corresponding to the light emitted by the LEDS.
Criteria on these curves will allow to accept or not the test.

5. Acceptation du test.

The green signal represents the light signal of the green LED (picked up on GREEN CCD). The red signal represents the light signal of the red LED (collected on RED CCD). The 2 peaks correspond to the signal of the top LED (red - on the left of the curve) and of the bottom LED (green - on the right of the curve) - (the CCD represented here at the horizontal way).
Yellow vertical lines represent the search zone of code DX by the software.

• The green and red signals must be inside the yellow windows.
• The green and red signals inside the yellow window must be the most regular as possible.
• The level of the signal must be sufficient.

6. Other affected tests.

• APS Cal Offset LED-CCD.
• APS Offset Perforation.
• APS Code DX.

7. Trouble shooting.

If the green or red signal inside the yellow zone is not sufficiently regular : it is necessary to dull the LED in order to obtain a more homogeneous signal (but a little less powerful).

If the green or red signal inside the yellow zone is not powerful enough : it is necessary to polish the LED in order to make the signal a little less homogeneous but more powerful.

If the green or red signal is nil : one of the LEDS does not work. Check all wiring. Change the LED if needed.