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Receive Eight Circle Control Troubleshooting Procedure
1) Test the modified
DXE-CC-8A
Control Console unit, which should be connected only to the
control lines of the Receive Eight Circle System. When the modified DXE-
CC-8A
is
connected to the control cable, do all of the selected switch position LEDs light normally?
2) When rotating the modified DXE-CC-8A Control Console switch from position 1, 2, 3 and 4, if
all LEDs light normally, measure BCD output voltages. Nominally, +12. Connections A, B, C
and D, reference to the ground pin G as shown below. The selected position will supply the
BCD logic voltage as shown in the chart below.
Switch Position
G
A
B
C
D
1
GND
0
0
0
1
2
GND
1
0
0
1
3
GND
0
1
0
1
4
GND
1
1
0
1
5
GND
0
0
1
1
6
GND
1
0
1
1
7
GND
0
1
1
1
8
GND
1
1
1
1
Table 1 - Modified CC-8A Output Truth Table
“1” 12 Vdc (Default)
3) If the voltages are not normal, less than +10 to 18 Vdc, with the control line connected, then
disconnect the control line and retest the modified DXE-CC-8A Control Console. If voltages
that were not correct, are now okay, that indicates a short in the control line or a problem in or
beyond the
Receive Eight Circle System relay unit.
