EDL Displays 6120 Operation And Maintenance Manual page 46

9. Attach the other end of the clip lead to the metal shaft of the screwdriver.
10. While holding only the insulated handle of the grounded screwdriver, carefully slide
the tip of the metal blade under the rubber cover of the CRT anode lead boot and
make contact with the metal electrode for at least five seconds. Repeat if
necessary until arcing no longer occurs.
11. Remove the anode connection from the CRT.
12. Disconnect the CRT connector board from the CRT base connector.
CAUTION! The monitor must be in the normal upright position for the following steps. It
may help to have a 3/4 inch block of wood beneath the monitor as far forward as possible
to take the weight of the monitor off the bezel. Care should be taken because the center
of gravity is near the front of the monitor and it has a tendency to tip forward.
13. Disconnect four pin Molex connector S8 (on end of Mother Board next to HVPS) and
remove wires and pins from pins 1 and 2. This is accomplished by using a sharp object
in the back of the connector body to release the pin to slide out.
14. Remove the four screws mounting the front bezel to the metal chassis.
15. Carefully remove the bezel forward from the chassis. This is easier said than
done. However, careful manipulation will have a successful conclusion.
16. Once removed, the bezel will remain attached to the monitor chassis by the front
panel controls assembly. Remove the two screws securing the control assembly to
the bezel with the Phillips screwdriver.
17. The four hex head screws mounting the CRT to the chassis should now be
removed with a 3/16 inch Allen wrench. Lift the chassis away from the CRT taking
care not to bump the neck of the CRT. The neck area is the most vulnerable area
of the CRT.
18. Position the replacement CRT on its face plate on a soft surface.
19. If the CRT has the DeGauss coil already installed on the CRT body, proceed to the
next step. If it does not, then attach the DeGauss coil from the old CRT to the new
one with new pads and tie wraps. Super Glue is a good adhesive for this purpose.
20. Carefully position the chassis assembly around the CRT and install the four Allen
head mounting screws. Make sure the chassis and CRT are square with one
another since this affects the alignment of the video image with the bezel.
21. Place the monitor in an upright position with the block of wood underneath.
22. Install the front panel control assembly to the plastic bezel. Position the assembly
such that the controls move freely within the plastic before tightening screws.
23. Install the bezel assembly onto the chassis assembly and secure with the four
Phillips head screws.
6115 - 6120 Operation and Maintenance Manual ©EDL Displays, Inc. January 1997
42