Primary Troubleshooting Procedures; Before You Start; Required Tools; Preparing The Terminal For Troubleshooting - Wyse WY-60 Maintenance Manual

o Use only insulated or nonconductive tools.
o Whenever you disconnect the anode from the anode lead,
make sure to discharge the anode as directed in Chapter 2.
o If you need to remove or replace the CRT/yoke assembly,
remember that the CRT can implode if you drop it or break
the neck. The flying glass can injure anyone within a
radius of six to ten feet.
Required Tools
Before you start to repair in the terminal, make sure you have
the tools and materials listed below.
o No.2 Phillips screwdriver
o 3/16-inch flat-bladed screwdriver
o Digital multimeter (DMM) or a voltmeter
o Test connectors for the MODEM and AUX ports (See Appendix C
for instructions to make them or Chapter 5 for ordering
in forma tion . )
o Nonconductive video alignment tool
o Tie-wraps and diagonal cutters to cut tie-wraps
PRIMARY TROUBLESHOOTING PROCEDURES
You should begin troubleshooting by preparing the terminal
properly and running the Power-On Self-Test and the Diagnostic
Self-Tests. These tests generate error messages, which are
identified in the "Fails Power-on or Diagnostic Self Tests"
section of Figure 3-1.
Preparing the Terminal for Troubleshooting
To prepare the terminal for troubleshooting, follow these steps:
1. Turn off the terminal.
2. Disconnect the computer's communication cables.
3. Unpl ug the power cord from its power sourc e.
4.
Remove the terminal bucket and back bezel.
5.
Plug the power cord back into it's power source.
6. Turn on the terminal.
3-2