Troubleshooting Flowchart; Additional Troubleshooting Procedures; Miscellaneous Symptoms - Wyse WY-60 Maintenance Manual

Figure 3-1 Troubleshooting Flowchart, page
1
of
1
Miscellaneous Symptoms
Ke yboard no t
operating
Communication
problems
Characters scrambled
or degraded, dots
missing
Characters don't
appear on the screen
a. Check keyboard cable for continuity.
b. Perform the keyboard test (see
"Checking the Keyboard" in this
chapter) .
c. Check connector J1 on the keyboard
PCB for shorts or breaks, repair if
necessary.
d. Check U1 (keyboard scanner) on the
keyboard PCB for correct operation.
Replace if necessary.
e. Check U23 on the terminal PCB.
a. Check setup information against the
host's requirements. Change to match.
b. See in form a tion reI a ted to
communciation error codes on page
3- 11 .
Check U16, U19, U20.
Check U19 and U20.
If the cursor and the status line
appear, assume a communications problem.
See the information related to
communications error codes on page 3-11.
ADDITIONAL TROUBLESHOOTING PROCEDURES
This section contains a number of specialized procedures to help
you repair the terminal. Some of them are referenced on the
troubleshooting flowchart.
Installation Checklist
The checklist in Table 3-2 helps you to quickly determine if the
terminal is installed correctly. If a user installs the terminal
inc
0
r r e c t
1
Y, i t may not fu nc t ion pro per
1
y.
3-12