Applies to

• Lotem^® 800
• Lotem Quantum
• Lotem Quantum Spectrum
• Lotem 400 with MCU

Priority = Next failure
Release date = 18 Jun 2003

Component

Bar flag detector

Problem

Electrostatic electricity that comes from plates/paper harms bar flag detector through anodized bar flag and causes problems such as "Right/left local does not respond.".

Solution

Change the bar flag construction by adding a grounding cable to the loading system bar. The new bar flag is made from two separated parts bonded together with epoxy glue, one part is plastic and the other is stainless steel.

The following guidelines were used for the new bar flag design:

• Keep same weight and dimensions as the old one.
• Non-conductive material at upper part of the bar flag.

Time needed to implement

1 hour

Parts needed

Procedure

Bar Flag Assembly

1. Open the front door of the platesetter.
2. Release the cassette from the platesetter.
3. Close the application, and shut down the platesetter.
4. Open the XY bar cover.
5. Remove the bar flag detector:

6. Remove the bar flag.
7. Release the bar flag bracket by removing the two screws, as shown below. Make sure the securing nuts will not fall down.

8. Using either sand paper or a metal brush, file the paint from under the bracket location (very important!!):

9. Reattach the bracket to the XY bar using the left screw.
10. Insert the other (right) screw through the supplied grounding cable (the cable suffix has two sizes, choose the correct one) and connect it to the bracket:
    Note: Use Loctite® 242.

Lotem 800


Lotem 400

11. Open both the X and Y plastic chain covers.
12. Route the grounding cable through the XY bar, the Y-axis plastic chain, and then through the X-axis chain:

13. Secure the grounding cable with tie wraps, making sure it does not interfere with the X and Y movements.
14. Close the X and Y chain covers.
15. Connect the other side of the grounding cable to the main frame:

Lotem 800

Lotem 400

16. Tie the rest of the free grounding cable, securing it so that it does not interfere with the loading operation.
17. Insert the new bar flag:

18. Reassemble the bar flag detector, making sure not to overly tighten the screw:

Test Procedure

1. Push the new bar flag up and down, making sure it moves freely.
2. Test the new grounding connection by using a multimeter (in resistor mode) between the bar flag bracket and the main frame. Make sure the grounding is good.
3. Power up the platesetter.
4. Start up the application.
5. Insert the loading cassette into the platesetter.
6. Open the bar flag detector dialog from the Lotem Controller.
7. Move the bar flag up and down. Make sure the detector changes status.
8. Perform plate loading with open doors, and make sure that the new grounding cable does not interfere with the normal operation of the XY loading system.
9. Close the XY bar black cover.
10. Close all opened doors.
11. Return to working status.

Technical contact

Meir Dana

Date submitted

19 Jun 2003

719-01636 Rev C