Field Change Order #28131- Sealed Light Detector Replacement

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

   
   Required Tools:

• Allen keys

Performing Shutdown

1. From the application, move the Carriage Motor to 800.
2. From the application, open the rear door.
3. Remove the upper back cover.
4. Exit the application.
5. Turn off the machine.

Replacing the Light Detector

1. Disconnect the Light Detector Connector wiring from the Light Detector.
   
   
   
2. Open the 4 screws on the Light Detector with a 3/32" Allen key.
   
   
   
3. Remove the Laser Protective Cover from the Light Detector.
   
   
   
4. Before installing the new Light Detector, record its LDT Factor. You will enter this number in the registry later.
5. Check the lens to make sure that there are no fingerprints on it. If there are, clean it with alcohol and acetone.
6. Put Loctite 242 on the ends of each Allen screw.
7. Re-Install the Light Detector with its Laser Protective Cover by tightening the 4 screws.
8. Check that the Light Detector does not touch the Tail Gripper bar.
9. Re-connect the Light Detector Connector.

Starting Up

1. Turn on the machine.
2. Close the upper back cover.
3. Close the rear door.
4. Log on to the application. The Carriage automatically returns to HP.
5. 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.
   

   Expose System>Laser System>Light Detector

   
   
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 400 mw.
   2. Expose a job.
   3. 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	:	50
      CEU	:	50
      CAP	:	20
      CJP	:	20
      CMA	:	20
      Other	:
      No Limit

      
      
   2. Schedule supplies for first lots:
      

      D.U		Month	QTY	Month	QTY	Month	QTY
      CMA	:	July	50
      CEU	:	July	50
      CAP	:	July	20
      CJP	:	July	20
      CMA	:	July	20
      Other	:

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