1. Test overview.

This test is used to verify that the subset " encoder wheel + sensor " of the film carrier functions correctly, and this in both directions of the motor.
For this, the motor will turn in one direction to make 6 revolutions of the encoder wheel, then the same thing in the opposite direction. An analysis of the values recorded by the encoder will allow to know if this subset functions correctly.
If this subset does not function, it is the whole the ADDR system which will not function.

2. Test conditions.

This test relates to the 120 film carrier inserted in the scanner.
The 120 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.

The encoder wheel must be in the centre of the sensor, and especially not touch this one. It is important that the encoder wheel is not buckled.

Explanation on the encoder wheel : The encoder wheel used in the film carrier has 500 tops per turn (1), which indicate the precise position of film + 1 signal per turn (2) which indicates that one has just made a turn (1 turn corresponding to X mm in linear advance of film). The external positions of the wheel (3) are not used.

4. Test realisation.

Click on RUN to execute the test. The motor will turn during a few seconds in one direction then a few seconds in the other direction. This length of time corresponds to 6 revolutions of the encoder wheel.
At the end, curves will be displayed, corresponding to the 6 times 500 positions of the encoder wheel, in one direction then in the other.

5. Test acceptance.

The acceptance criteria are displayed on the screen (identical for each direction of operation) :

• Encodeur polarity : Check of the direction of operation : must be OK
• Encodeur samples : Numbers of measurements (6 times 500): must be = 3000.
• Encodeur variance : Must be different from 0.
• Timings average : Must lie between 1000 and 1500.
• Timings slope : Must lie between -2 and +2.

6. Other affected tests.

• 120 Encoder 2.
• 120 Cal RGB IR.
• 120 ADDR.

7. Trouble shooting.

If The test is rejected : remove the protective plate and visually check that the wheel is well positioned in the sensor, that it does not touch it, that it is not buckled or that it is not damaged (in particular 500 positions). In this case, change it.