Wyse WY-60 Maintenance Manual page 49

Safety Summary
This terminal contains high voltage. Don't attempt to service
the terminal without taking all the precautions you need for
working with high volt3ge.
o If you must open the terminal for any reason, first
turn off the power and unplug the terminal.
o Remove any jewelry, especially any on your hands, wrists, or
neck.
o Avoid wearing clothing that carries a static charge.
o Use only insulated or nonconductive tools.
o If you need to remove or replace the CRT/yoke assembly,
remember that it can implode if you drop it or break
the nec
k.
The fl ying glass can in jure an yon e wi thin a
radius of ten feet.
Required Tools
Before testing the power supply voltages or making any
adjustments to the terminal display, make sure you have the tools
listed below:
o Flat-bladed nonconductive alignment tool
o Hex nonconductive alignment tool
o No.2 Phillips screwdriver
o Digital voltmeter (DVM)
o Millimeter ruler or reticle (the reticle is optional--see
Appendix D for instructions on how to use the reticle when
you check the display.)
o Diagnostic test connectors (see Chapter 5 to order them or
Appendix C to make them)
CHECKING THE DISPLAY SPECIFICATION
Before you adjust the display on the monitor, measure the screen
margins and study the display.
Tools required:
o Millimeter ruler or reticle (reticle is optional)
o Diagnostic test connectors
4-2