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Keyboard-transmitter will not transmit.
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TM-11-5815-238-20 Teletypewriter Sets AN/GGC-3 AN/GGC-3A AN/GGC-53 AN/GGC-53A and Teletypewriter Reperforator-Transmitters TT-76/GCC TT-76A/GGC Manual
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END-OF-LINE INDICATOR lamp does not light on operation of 66th character.
TM 11-5815-238-20
Table 2-2. TROUBLESHOOTING- Continued
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Step 2.
Be sure SIGNAL BIAS switch in 20-MA position to check for 20 mA reading and SELECTOR
MAGNET plug is in 20 mA position. Change to 60-MA positions and take 60 mA readings.
Step 3.
Current in bias circuit should read 12.25 mA if selector plug is in 60-MA jack or 8.75 mA if
selector plug is in 20-MA jack. Refer to TM 11-5815-238-10.
Adjust bias. Refer to TM 11-5815-238-10 (TT-76/GGC) or paragraph 2-24, this TM (TT-76A, B or
C/GGC).
If meter still does not equal the values given in Step 3. higher category of maintenance required.
5. Reperforator prints errors or scrambles letters and functions.
Be sure rangefinder dial is properly set.
Adjust
rangefinder
dial
between
maximum and minimum good copy
positions. Refer to TM 11: 5815-238-
10.
CAUTION
Do not change position of rangefinder
dial while teletypewriter is OFF.
6. Wrong characters are printed at either distant or local teletypewriter.
Be sure motor is operating at correct speed of 3600 revolutions per minute (rpm).
Adjust motor speed to 3600 rpm. (See TM 11-5815-238-10)
Paper tape does not feed properly when SPACE BAR and REPEAT key are pressed.
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