1. PO/EO: 214.07 REFS: A. C-53-771-000/MB-000 B. C-53-771-000/MC-000 FAULT FINDING OF THE AN/PRC-522

2. MTPS: 1. Basic Fault Finding of the AN/PRC-522

3. FAULT FINDING OF THE AN/PRC- 522 MTPS: 1. Basic Fault Finding of the AN/PRC-522

4. Basic Fault Finding #Fault " Transceiver maintains zeroized state #Probable Cause " Transceiver

5. Basic Fault Finding #Fault " No modes recall at power up #Probable Cause " Battery " Transceiver

6. Basic Fault Finding #Fault " Transceiver serviceable without display #Probable Cause " Display disabled " Transceiver

7. Basic Fault Finding #Fault " Intermittent Rx/Tx and/or reduced radio set range #Probable Cause " Battery " Antenna whip assembly " Transceiver

8. Basic Fault Finding #Fault " Error code #Probable Cause " Transceiver

9. Basic Fault Finding #Fault " Error code 0901 #Probable Cause " Battery

11. Confirmation #What probable cause would you look for when there is loss of transmit? " Headset-microphone or handset " Transceiver

12. Confirmation #What is the first thing that you look for when the transceiver is serviceable without display? " Check for display disabled

13. Basic Fault Finding #Fault " No transmit at 4 W output #Probable Cause " No transmit power (NTx) " Battery " Transceiver

14. Basic Fault Finding #Fault " Keypad disabled #Probable Cause " Transceiver

15. Basic Fault Finding #Fault " Loss of transmit #Probable Cause " Headset Microphone or handset " Transceiver

16. Basic Fault Finding #Fault " Loss of receive #Probable Cause " Transceiver " Headset microphone or handset

18. Confirmation #What are three probable causes when there is no transmit at 4 W output? " No transmit power (NTx), Battery and Transceiver. #What action would be taken if the keypad was disabled? " Push followed by. If keypad cannot be enabled, replace the transceiver.

19. Basic Fault Finding #Fault " Power up fails #Probable Cause " Battery " Transceiver

20. Basic Fault Finding #Fault " 1 kHz error tone (Crypto Fail Tone) #Probable Cause " Transceiver

21. Basic Fault Finding #Fault " 1.6 kHz tone for 250 ms, 1.24 kHz tone for 250 ms, then 500 ms pause.(Key Alarm) #Probable Cause " Unprogrammed or bad COMSEC, TRANSEC, or KEK

22. Basic Fault Finding #Fault " Alternating 1 and 2 kHz tones (Error Tone) #Probable Cause " Incorrect keypad entry " Two transceivers with H selected (two master stations).

23. Basic Fault Finding #Fault " 2 kHz burst tone, 25 ms on and 475 ms off (Low Battery warning) #Probable Cause " Battery is low

25. Confirmation #What is the probable cause for failure to Power Up? " Battery " Transceiver

27. Final Confirmation #What does the error code 0901 mean? " Battery is low. #What would be the first thing that is checked when you have loss of transmission? " Headset-microphone or handset

28. FAULT FINDING OF THE AN/PRC- 522 MTPS: 1. Basic Fault Finding of the AN/PRC-522