Troubleshooting Quick Reference Guide; Loopback Test Connector Pin Assignments; Module-Level Troubleshooting Quick Reference Guide - Wyse WY-120 Maintenance Manual

Table 2-2 Loopback Test
Connector Pin Assignments
Troubleshooting Quick
Reference Guide
Section 2
2-3
Loopback
Port Pin Slgnal
MAIN 2-3
Txo- RXD
4-5
RTS - CTS
8-20
DCD- DTR
AUXl 2-10 DO
- ACK
(Even Parallel)
4-11
D2
- BUSY
6-12 04
- PE
8-15 06
- ERROR
1-LED-17
STB -+ Ground
AUXl
3-10
DI -+ ACK
(Odd Parallel) 5-11
03 -+BUSY
7-12
05 -+PE
9-15 07
-+ERROR
1-LED-17
STB -+ Ground
Table 2-3
is
a troubleshooting quick reference guide. Once you
discover the major symptoms, this table can quickly direct you to
the most likely problem area. However, don't automatically
replace the suggested modules until you've studied the problem
and checked related details in the troubleshooting flowcharts.
Table 2-3 Module-Level Troubleshooting Quick Reference Guide
Terminal
Symptom
PCB
No video
•
Poor display
•
Fails diagnostic test
•
No keyboard r~sponse
•
Communication
•
problems/host
Possible Problem Area
CRT/ Keyboard Setup Comm.
Yoke Cable Parameter Cable
•
•
•
•
• •
Adjust-
ment
•
•
Test
Conn.
•
Table 2-4 provides suggestions for actions to take depending on
the symptom exhibited. The flowcharts (Figures 2-1 through 2-13)
give detailed directions and waveforms, where applicable, for
corrective actions.