Product

• ThermoFlex^® Mid
• ThermoFlex Narrow

Component

One of the following may be faulty:

• TSP cable
• Light detector
• DDB board
• LDD board
• TSP board
• Diode

Symptoms

Patterns, artifacts, lines, stripes, or streaks appear on the image, as shown, during laser uniformity calibration testing.

Cause

• TSP cable connection is loose
• Calibration of one of the following is incorrect:
  • focus
  • elevation
  • intensity
• The connections of one of the following boards are faulty:
  • DDB
  • LDD
  • TSP
• Light detector parameter values are incorrect
• TSP cable is defective
• Light detector is defective
• One of the following boards is faulty:
  • DDB
  • LDD
  • TSP
• Diode(s) malfunction

Solution

After each step, expose an image to check whether the change has resolved the problem.

1. Verify that the TSP cable is firmly connected, and fix if required.
2. Perform the following calibration test procedures:
• Focus Calibration Test
• Elevation Calibration Test
• Drum speed calibration test (for flexo plates)
3. Remove the DDB board, clean its connections, and return the board to its place.
4. Repeat step 3 for the LDD and TSP boards.
5. Check light detector parameter values:
1. Check what factor appears on the light detector.
2. In the hardware tree, select ...IO OBJECTS > LOCAL 3 > LDT > Light Detector and verify that the High and Low Dac Factor parameter values match the factor that appears on the light detector.
3. In the Laser Group dialog box, verify that the laser calibration value is 600 mw.
   
4. Verify that the coarse factor is 130 ±20 and that the laser log is 950 ±150.
5. If the coarse factor is not within this range, increase or decrease the light detector factor as required.
6. Replace the light detector (see Light Detector Replacement procedure).
7. Replace the TSP cable.
8. Replace the DDB board.
   Note: If this resolves the problem, perform the Delay Calibration Test.
9. Replace the LDD board.
10. Replace the TSP board.
11. Check which diode or diodes produce the patterns and replace the relevant diodes.
    Note: If this resolves the problem, perform the Resolution Calibration Test and the Drum speed calibration test (for flexo plates).

Technical contact(s)

Viki Arviv

Date submitted

08 Aug 2004