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CATHODE RAY TUBE REPLACEMENT
(P/N 6119-0108-03)
Tools Required: 1.
2.
3.
CAUTION! Replacing the Cathode Ray Tube involves contact with dangerous high
voltage elements. Follow instructions carefully and observe all safety precautions!
All efforts should be made to isolate the fault to the Cathode Ray Tube (CRT) before
beginning replacement.
Before replacing the CRT consider the following:
1.
All BNC signal input connections on the rear panel have been checked for proper
connection and the signal source is operating properly.
2.
Front panel controls have not been inadvertently set to produce a no-raster
condition.
3.
HV disable and SYNC indicators have been properly interpreted.
4.
Low Voltage Power Supply (LVPS) has been replaced (the LVPS provides the
input voltage for the HVPS).
REPLACEMENT PROCEDURE
1.
Turn Off a.c. power at the front panel.
2.
Disconnect the monitor a.c. power cord and all coaxial cables on the rear
3.
Wait twenty minutes for voltages to discharge.
4.
Remove all rear panel plug-in modules.
5.
Remove the rear enclosure by removing four screw and sliding the enclosure to the
rear. If you choose to place the monitor on its face to accomplish this, make sure
the working surface is soft to avoid scratching the CRT face plate and the plastic
bezel.
CAUTION! Lethal Voltages could be present at the CRT connectors. Follow
procedure carefully.
6.
Remove the top metal shield.
7.
Connect the chassis to earth ground.
8.
Attach one end of a clip lead to the metal chassis of the monitor such that the other
end can reach the HV anode connector on the CRT.
6115 - 6120 Operation and Maintenance Manual
Screwdriver, Phillips #2
Allen wrench, 3/16 inch
Insulated lead wire 15 inches long (18 to 20ga.) with clips on ends
©EDL Displays, Inc. January 1997
41
panel.
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