FCO 28131-Sealed Light Detector for Lotem 400

Description :
The purpose of this FCO is to eliminate damage to the Light Detector, and its malfunction, by preventing dust from entering the Light Detector.

1. Reason For Change
   The unsealed Light Detector enabled dust to enter, despite periodic cleaning.
   The dust covering the optic lens and the electrical board shortened the field life of the light detector.
   
   
2. Description of Change
   Replace the unsealed Light Detector with a sealed one.
   
   
   
   
3. Change Procedure

Replacing the Light Detector

1. From the application, send the Carriage Motor to the 300 position.
2. Open the rear door and the upper back cover.
3. Shut down the application and the machine.
4. Disconnect the Light Detector Connector wiring from the Light Detector.





5. Open the four screws on the Light Detector with a 3/32" Allen key.
   

   

   
   
6. Remove the Laser Protective Cover from the Light Detector.
   

   

   
   
7. Before installing the new Light Detector, record its LDT Factor. You will enter this number in the registry later.
8. Check the lens to make sure that there are no fingerprints on it. If there are, clean it with alcohol and acetone.
9. Put Loctite 242 on the ends of each Allen screw.
10. Re-Install the Light Detector with its Laser Protective Cover by tightening the four screws.
11. Check that the Light Detector does not touch the Tail Gripper bar.
12. Re-connect the Light Detector Connector.
13. Turn on the machine.
14. Close the upper back cover and the rear door.
15. Log on to the application. The Carriage automatically returns to HP.
16. Check the application to make sure that the machine is in ready state.

Recording the LDT Factor

Important: You must register the LDT factor.

1. Access the Light Detector Properties dialog box.
   
2. Register the LDT factor that you recorded in the Value column for the following parameters:
   • High Dac Factor
   • Low Dac Factor
     
     
3. Click Apply.
   
4. Close the dialog.
   

4. Test Procedure
   1. Perform laser calibration, making sure that all diodes pass 350 mw.
   2. Perform Intensity Calibration Test.
   3. Expose a job.
   4. Get customer's approval for plate quality.
      
      
5. Parts List
   

   PART	QTY	DESCRIPTION
   509A3E780	1	Light Detector Assy III
   !FCO-DOC	1

   
   
6. Attached Documentation
   None.
   
   
7. Material Disposition
   Return the old Light Detectors to CIL.
8. Logistics
   1. Approved quantities:
      

      CAM	:	20
      CEU	:	20
      CAP	:	8
      CJP	:	5
      CMA	:	5
      Other	:
      No Limit

      
      
   2. Inventory in warehouses:
      Return all light detectors (P/N 509A1L427) in inventory to CIL, and order the Sealed Light Detector (P/N 509A3E780).