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Table 4-2.
Digital Circuits, Symptom Troubleshooting Chart (Continued)
Check Procedure
Corrective Action
Symptom
r-----------------------------~--------------------------------------~--------------------------~------
6. When a character key is
pressed, a different
character appears on the
display.
a.
-
b.
Check monoscope XY deflec-
tion amplifie r A 3 by perform-
ing the alignment given in
para 4-1.2.
Check the keyboard assembly
as in step la in this Symptom
Troubleshooting Chart.
Notes
1.
The ETX character must be
typed and displayed on the CRT
before each transmission.
2.
All codes written in this pro-
cedure are for a display which
utilizes even parity.
3.
In this procedure. the codes for
STX and ETX are stated below.
If
the display under test does
not use the codes stated for ETX
or STX insert the codes which
are used for that display into
the procedure.
LSB
P
SOM
01000001.
If the six digital inputs in
step 4-2. 5£ are correct but
incorrect characters are
painted even afte r alignment,
replace monos cope XY deflec-
tion board A3.
If the keyboard assembly op-
erates properly, replace
board A 13.
If not. replace
keyboard assembly All.
tJ
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.....L __________________
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