1. DAGR Troubleshooting 113-011
Lesson Title
DAGR
Troubleshooting
Lesson Number
Motivator: “Other than physical damage, the soldier may need to return the DAGR to the manufacturer when a malfunction occurs. Performing troubleshooting on the DAGR is a means of finding out whether the DAGR is working or not working properly.”

2. LESSON OBJECTIVES Perform the DAGR troubleshooting procedure.
Inform students of the lesson objectives:
ACTION: Perform the DAGR troubleshooting procedure.
CONDITION: Given a DAGR receiver, accessories necessary to operate the DAGR, and a DAGR Operator and Maintenance Manual or pocket guide.
STANDARD: Performed the DAGR troubleshooting procedure in accordance with the DAGR Operator and Maintenance Manual.
Safety Requirements and Alerts: WARNING: If abused, lithium batteries can explode causing severe injury. Be sure to store batteries in original packaging until ready to use and observe polarity during installation. Reverse polarity can cause damage to the battery and receiver.
CAUTION: Do not mix battery types. Do not mix old batteries with new batteries. Ensure DAGR primary batteries are good (check battery indicator on display) before using unit.
These precautions are done to ensure proper battery life and proper unit operation. If using external DC power, ensure positive lead of external DC power cable (in-line fuse holder) is connected to the positive lead of external power source to prevent possible damage to the unit. Internal batteries may remain installed while using external power. The memory battery should always remain installed. The DAGR is protected against accidental reverse connection of external power.
NOTE: The DAGR antenna needs a clear field of view to the sky (line of sight) for best satellite visibility. For best reception, the DAGR should be held at a 90 degree angle in relation to the earth’s surface.
If applying power to DAGR in cold weather and the display does not come on, do not keep turning the unit off and then back on for power-up. The DAGR has the capability for the user to enable a display heater, and without the heater enabled, the DAGR could take up to 20 minutes to become operational. To conserve battery power, the DAGR should be kept warm before applying power, then kept warm in between usage such as keeping the DAGR inside a vehicle or inside the users coat.
Risk Assessment Level: The Risk Assessment for this lesson is low.
Environmental Considerations: The DAGR antenna needs a clear field of view to the sky (line of sight) for best satellite visibility. For best reception, the DAGR should be held at a 90 degree angle in relation to the earth’s surface.
Instructional Lead-in: The troubleshooting procedure is designed to detect and isolate DAGR failures and malfunctions. The troubleshooting procedure directly relates to the operational checkout procedure.

3. OVERVIEW Introduction Operations Troubleshooting Familiarity
Pretest Setup
Operations
Troubleshooting Procedure

4. DAGR TROUBLESHOOTING DAGR Troubleshooting Familiarity
Designed to Detect and Isolate Failures
Confirm Failure
The troubleshooting procedure is designed to detect and isolate DAGR failures and malfunctions. The troubleshooting procedure directly relates to the operational checkout procedure. After a DAGR failure has been found and corrected, perform the operational checkout procedure (lesson plan 2) to make sure the DAGR is operating properly. If troubleshooting confirms a DAGR failure, and repair is beyond what is covered in DAGR Operator and Maintenance Manual, return the DAGR unit to the manufacturer.

5. DAGR TROUBLESHOOTING Pretest Setup WARNING – CAUTION –
Lithium batteries can explode
Reverse polarity can cause damage to the battery and receiver
CAUTION –
Do not mix battery type
DAGR Used for Time
DAGR Resets to Default
Warning:
If abused, lithium batteries can explode causing severe injury. Be sure to store batteries in original packaging until ready to use and observe polarity during installation. Reverse polarity can cause damage to the battery and receiver.
Caution:
• Do not mix battery types. Do not mix old batteries with new batteries. Ensure DAGR primary batteries are good (check battery indicator on display) before using unit. These precautions are done to ensure proper battery life and
proper unit operation.
• If using external DC power, ensure positive (red) lead of external DC power cable is connected to the positive lead of external power source to prevent possible damage to the unit. Internal batteries may remain installed while using external power. The memory battery should always remain installed. The DAGR is protected against accidental reverse connection of external power.

6. DAGR TROUBLESHOOTING Note No Pretest Connections or Adjustments
Clear View of Sky
Display Heater
No Pretest Connections or Adjustments
External Power Source with Host Platform mount
Note:
• The DAGR antenna needs a clear field of view to the sky (line of sight) for best satellite visibility. For best reception, the DAGR should be held at a 90 degree angle in relation to the earth’s surface (not applicable to system installation).
• If applying power to DAGR in cold weather and the display does not come on, do not keep turning the unit off and then back on for power-up. The DAGR has the capability for the user to enable a display heater, and without the heater enabled, the DAGR could take up to 20 minutes to become operational. To conserve battery power, the DAGR should be kept warm before applying power, then kept warm in between usage such as keeping the DAGR inside a vehicle or inside the users coat.
There are no pretest connections or adjustments required to troubleshoot the DAGR as a handheld unit. If the DAGR is used in a host platform system for the troubleshooting procedure, install the DAGR into the host platform, then install the external power source and external antenna along with related cables. Additional host platform information is included in brackets within the procedure.
Make sure DAGR is set up in Continuous Mode to avoid error messages.

7. DAGR TROUBLESHOOTING REF Para 19.3
(1) Inspect the DAGR and external cables and equipment for damage and/or missing parts.
If DAGR is damaged or parts are missing, return to the manufacturer.
Push the PWR key to turn the DAGR on.
(4) If DAGR display does not come on after power is applied, check primary battery and primary battery pack, external connections to power source. If battery connections are good, return DAGR to manufacturer.
Para 19.3

8. DAGR TROUBLESHOOTING
If operating in cold conditions, allow additional time (up to 20 minutes) for display to appear. .
Observe the power up test results.
If a failure occurs, check all external connections and rerun self-test.
Follow instructions on display or return DAGR to manufacturer.
(9) After power-up and using primary power batteries, does primary battery life indicator show sufficient battery life?

9. DAGR TROUBLESHOOTING
If battery life is insufficient, replace primary batteries and update battery information on the Battery page .
After power up, ensure a low memory battery message does not show.
Access the Battery page and observe date shown in the Memory Battery Installed field .
The memory battery date is updated by the user at time of battery replacement .
(14) If the DAGR shows a date approximately six months old, then replace memory battery and update memory battery information on the Battery page

10. DAGR TROUBLESHOOTING
After power up, perform an operator induced commanded self test (operator intervention required).
If DAGR fails self-test, check all external connections if applicable, and rerun self-test.
Follow instructions on display and/or return DAGR to manufacturer.

11. DAGR TROUBLESHOOTING
(18) After power up, if the DAGR passes self-test and display blinks between black and grey text, do the following:
Move DAGR [or external antenna] to open view of the sky.
Hold DAGR 90˚ to horizon.
Ensure satellite acquisition time was at least two minutes.
Ensure DAGR is in a satellite tracking mode of operation.
Perform the manual initialization procedure.

12. DAGR TROUBLESHOOTING
(19) If display does not stop blinking, return DAGR to manufacturer.
(20) If display stops blinking, troubleshooting is complete.

13. DISPLAY TEST SUMMARY PAGE
From any display (except a message pop-up), push the MENU key twice to display the Main Menu.
(2) Highlight System, then push the ENTER key.
(3) Highlight Test Summary, then push the ENTER key. The Test Summary page is displayed.
The Results Table The results table displays five columns of information described as follows. If no faults or information messages exist, the individual table fields display “- -”.
• F/I — Displays information as FAIL or INFO.
• DEVICE DESCRIPTION — Displays a brief device description.
• INDEX — Displays an index value of three digits corresponding to the device description.
• CURRENT— Displays the current device value consisting of four digits.
• ACCUM — Displays an accumulated device value consisting of four digits.

14. CHECK ON LEARNING
The troubleshooting procedure is designed to detect and isolate what?
DAGR failures and malfunctions
True or False. If DAGR is damaged, return to the manufacturer.
True
When is the memory battery date is updated by the user?
At the time of battery replacement
1. True or False. If DAGR is damaged or parts are missing, return to the manufacturer.
(ANS: True). (See para 19.1 in the DAGR Operator and Maintenance technical manual).
2. When is the memory battery date is updated by the user?
(ANS: At the time of battery replacement). (See para 19.3 in the DAGR Operator and Maintenance technical manual).
3. What does it mean when after power up, if the DAGR display blinks between black and grey?
(ANS: The DAGR is not acquiring satellites). (See para 19.3 in the DAGR Operator and Maintenance technical manual).

15. LESSON SUMMARY
You have now learned how to perform the troubleshooting procedure.
During this lesson you have learned to perform the DAGR troubleshooting procedure.
Transition Next Lesson: Now that we know the steps necessary to perform the DAGR troubleshooting procedure, we will learn how to reprogram the DAGR and load maps into the DAGR.