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Table 4-2.
Digital Circuits, Symptom Troubleshooting Chart (Continued)
Symptom
Check Procedure
Corrective Action
4.
When pin 40 of A 12 is grounded the
STX and DA characters are dis -
played on the CRT.
Example
DA
~
D
I
TEXTI
Character
1
2
3
Slot
5.
Check the control lines in accord-
ance with the diagram below.
~
AI<
') t
_. ':"
o~
.
~
Pin
• 1' 1
t l \ Ol"
Pin
Pin
-,
",n
,"- A,l\
OFF
\." "I'. U1T
REOf'ESl 105E;";0
"
~
,
\/,
Cl.EAR 10
SE~D
,
r - - - - ,
"
"
D . .o.1 A TEPMI!':Aj. PFAO'l
I
i"---~-
I I
OA1 A CARRIER Df: fEel OR
,
"
,
'
"
RECEIVED DAl A
,
' 0
"
f - - - - - -
,
1 RA;'>lSMI11 ED DATA
Il
I
Il
~
--
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