Table of Contents
Advertisement
~
I
tv
.....
Table 4-2.
Digital Circuits, Symptom Troubleshooting Chart (Continued)
Symptom
11. Transmitted data
incorrect.
12. Unable to receive data.
Transmit mode is
operational.
Check Procedure
a.
Connect the 402-2 Test Set to
J 1 of the Te.rminal Unit and
set the character select switch
to 3.
Enter the characters "(If
and
~
in the first and second
character slots of the first line
and depress the XMIT key.
Observe that the indication on
LSB
the lamp readout is
00010100.
~.
Enter the characters I'W" and
~
in the first and second charac-
ter slots of the first line and
depress the XMIT key.
Observe that the indication on
LSB
the lamp readout is
11101011.
a.'
Connect the 402-2 Test Set to
J
I of the Terminal Unit.
De-
pres s the SHIFT and CLEAR keys
on the keyboard.
Enter the fol-
lowing code from the test set.
LSB
P
SOM
01000001
DA
K
F
5
EOM
To be dete rmined
11010010
01l0001l
10101100
11000000
Corrective Action
If
~
or
~
is incorrect, re-
place the A 12 board.
If
~
and
~
are correct, the
trouble is not in the Te rminal
Unit.
If the CR T presentation is
incorrect, perform check b.
If the CR T presentation is
correct, the trouble is not
in the Terminal Unit.
Advertisement
Table of Contents
