Troubleshooting; Before You Start; Installation - Wyse WY-60 Maintenance Manual

3
TROUBLESHOOTING
Before You Start
3-1
Safety
3-1
Required Tools 3-2
Primary Troubleshooting Procedures
3-2
Prepar ing the Terminal for Troubleshooting 3-2
Power-On Self Test
3-3
Diagnostic Self-Test 3-3
Back-to-Back Diagnostic
Self-Test
3-4
Troubleshooting Quick Reference Guide
3-4
Troubleshooting Flowchart
3-5
No Video/No Beep
3-7
Dim Video 3-10
Other Video Problems 3-10
Fails Self-Test of Diagnostic Tests
3-10
Miscellaneous Symptoms 3-12
Additional Troubleshooting Procedures 3-12
Installation Checklist 3-13
Checking for Continuity 3-14
Power Supply Check on the Terminal PCB 3-14
Checking the Keyboard
3-15
Isol ati ng Circ ui ts 3- 15
BEFORE YOU START
Read the following safety information carefully before you
attempt to troubleshoot your unit.
Safety
Warning--This
terminal contains high voltage. Don't attempt to
service the terminal without taking all the precautions necessary
for working with high voltage, including the following:
o If you must open the terminal for any reason, turn off
the power, disconnect any communication cables, and unplug
the terminal.
o Remove any jewelry, especially from your han1s and wrists.
o Avoid wearing clothing that holds a static charge.
3-1