FSB 412 - Lines on Film (Dolev 800)

This FSB summarizes the problems and suggested solutions for the symptom of lines on film. In all cases, make sure that the D.max is correct according to film manufacture.

1. Lines During Stop Spiral
2. Clear Lines Around Drum, Patterns on Black Area (On High Contrast Film)
3. White Lines - Low D. Max in Certain Areas
4. Data Shifts Lines, Clear Lines

1. Lines During Stop Spiral

1.1    Use S/W version 4.04 (FCO 19182) and up.
1.2    Check the lead screw coupling. Remove the coupling screws, clean and lock again. Make sure it is
         tightened.
1.3    Check the lead screw pin (no freedom between the pin and the carriage). Grease it if necessary. (The pin
         can be locked to the carriage to check if this is the reason for the lines.)
1.4    Replace the shutter.
1.5    Make sure that the CRI board has comp. level O (Comp N - FCO 19100, Comp O - FCO 19649).
1.6    Check and adjust the voltage selector on the standard controller.
1.7    Check the lens housing - fiber connection (FCO 18330). Replace if necessary.
1.8    Change the spinner speed (slow it by 10-15%).
1.9    If the file size changed, clean the encoder disk on the dynamic optics.
1.10 Replace the dynamic optics harness.

2. Clear Lines Around Drum, Patterns on Black Area (On High Contrast Film)

2.1    Clean the optomech beam and the carriage "rullon" (the red rullon).
2.2    File the center area of the rullon, so it will move on both sides only and will be more stable.
2.3    Adjust the stepper cosine or sine in the stepper harmonic table.
2.4    Change the spinner speed (slow it by 10 - 15%).
2.5    Replace the leadscrew assembly.
2.6    Replace the stepper drive and/or stepper motor.
2.7    Implement FCO 19649 (Replace CRI diode CR205 with 1N749ARL - 130B04300).
2.8    Replace the static optics.

3. White Lines - Low D. Max in Certain Areas

3.1    Check the lens housing - fiber connection (FCO 18330). Replace it if needed.
3.2    Check the dynamic optics harness.
3.3    Replace RF driver.
3.4    Adjust the stepper cosine or sine in the stepper harmonic table.
3.5    File the center area of the rullon, so it will move on both sides only and will be more stable.
3.6    Replace the static optics.
3.7    Replace OMC board.

4. Data Shifts Lines, Clear Lines

4.1    Check the data cable . Add ground to the cables connectors (FCO's 18535, 18638).
4.2    Replace the VLSI board (FCO 19478 to comp level M).
4.3    Replace the Strobe board