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If there is a data connection available, "OK-
COM" is shown.
Use the "Down" key to access the "si-
gnal card test"
"SIGCDTEST" is displayed
Press the "Enter" key
The "Signal Card Test" starts, "SIGCD ON" 
appears on the display.
If the "signal card" is active, it will emit an 
acoustic signal in confirmation.
Press the "Esc" key to exit the "Signal 
Card Test"
"SIGCD TEST" is displayed
Use the "Down" key to select additional 
options:
e.g., Reset Personal Display Card ("PDCD 
RST") ...
IMPORTANT! If no acoustic signal is 
heard, the signal lines should be checked.
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