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DJI T100

Repair Training

Kenneth.deng 2025.04

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Overall Product Introduction (T100)

AG601

Propellers

Centrifugal Sprinkler

Motor

ESC

RTK Antenna

Video Transmission Antennas

FPV Camera

Downward Radar

Spraying board

Laser Radar

Spray Tank

Magnetic Drive Impeller Pump

LED long-range and bottom auxiliary light

Forward Radar

Forms five-eye vision with FPV camera

Payloads spraying system

Rear two spray lance layout

Product Introduction - Payloads Introduction (T100 Spraying System)

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1. Component Function:

• Magnetic drive Cooling Fan pump: Responsible for delivering the liquid from the spray tank to various pipelines;
• Dual-channel electromagnetic Flow Meter: Measures the flow rate of the liquid in real-time.
• Liquid Level Gauge: T100 detects the pressure difference between the external air pressure and inside the chemical pressure to measure the spray tank liquid level altitude;
• Solenoid Valve: Precisely controls the sprinkler start and stop, preventing liquid leakage;
• Dual Atomization Centrifugal Sprinkler: Uses high-speed rotation of the centrifugal disc to atomize the liquid, evenly spraying it onto the crop surface.
• Sub-Mother Cap: opening in the center of the cap for convenient dosing with a dosing gun.

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2. Water-Cooled Mist Sprinkler (Optional)

• Mist Sprinkler: Achieves atomization through coaxial counter-rotation of two motors, driving the disc at high speed, with a particle size range of 10-500 microns.
• Motor Water Cooling: The mist sprinkler requires high-speed motor rotation to produce atomization. The channel design allows the liquid to flow through the centrifugal sprinkler motor, carrying away motor heat and improving mean time to failures (MTTF);

Notices

1. The liquid level gauge detects external air pressure through external air pipes, do not allow dirt or blockage;

2. The centrifugal sprinkler motor speed reaches up to 14,000 revolutions per minute, do not touch or idle;

Product Introduction - (T100 Spreading System)

1. T100 Payload - Spreading System Composition

• Weighing Sensor: T100 (Mounted Weighing Sensor) is mounted on the material box, weighing the remaining material in real-time to accurately guide spreading operations;
• Spreading Control Board
• Spreader: The auger pushes a fixed amount of material with each rotation. By controlling the speed of the auger and the spinning disc, the spreading amount and uniformity are achieved. The T100 features an increased auger diameter and chamber volume, significantly enhancing the spreading flow rate.
• Brim: Extend a brim prevents material from scattering onto the landing gear and propeller, preventing aircraft damage and improving spreading uniformity.
• Spinning Disc Motor: The spinning disc motor provides more powerful rotation.
• Hall Sensor: Auger model detection and auger fixed-point stop. [Auger fixed-point reset prevents material leakage, ensuring spreading flow accuracy]
• Material Detection Motor: The rotating baffle detects the presence of material and triggers an alarm when there is no material.

Notices

1. However, the auger can be quickly removed for cleaning and maintenance (as shown below).

2. The T100 & T70P spreaders are identical, differing only in the hopper.

T100 Payloads-Spreading System

Spinning Disc/Eaves

Auger Motor

Auger, Material Detection

Spread Tank

Material Detection

Auger

Spinner Disk

Stainless Steel Liner

Eaves Side Bumps Reduced

Spotlight

Spreading Board

Auger Motor

Mounted Weight Sensors

Weight Sensors

Product Introduction - Parameter Introduction (FAQ) (T100)

1. What are the advantages of the T100's modular platform design?

• It can meet the diverse task requirements of spraying, spreading, and lifting;
• When the drone is only performing spreading/hoisting operations, it can reduce ineffective load such as sprinklers, improve operating time, and removing sprinklers reduces drone crash losses;

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2. What is the propeller rotation direction of the DJI T100?

The rotation direction of DJI T100 propeller is consistent with T40/T50, as shown in the right image.

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T100 propeller rotation direction

Materials Identification

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Part Two

Material detection (T100)

The middle frame has four new latch components, making disassembly and assembly more convenient than the T50.

A new laser radar has been added, and the power distribution board wiring has been changed to a screw lock structure.

Material detection (T70 series & T100)

The following is for reference only for the material exploded diagram. For details, please refer to the dealer center: https://dealersystem-abroad.dji.com/support/help/search?lang=en&re=US&trackId=3e724da8-7c5f-a5f7-9000-35297c1ba265&pci=960502&defaultOpened=,21

Disassembly and Assembly, Testing & Maintenance Guide

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Part Three

This part introduces the usage of specialized disassembly, assembly, or maintenance fixtures, tutorials and precautions of disassembly and assembly, and the locations of the waterproof label and the anti-dismantle sticker.

Toolkit Introduction & Recommended Torque

Disassembly and Assembly Video

For various disassembly and assembly videos, please refer to the dealers help center: https://dealersystem-abroad.dji.com/support/help/search?lang=en&re=US&trackId=3e724da8-7c5f-a5f7-9000-35297c1ba265&pci=960502&defaultOpened=,21

Disassembly and Assembly Precautions (T100 Aircraft)

• The power distribution board screws have springs and washers, ensure they are mounted, otherwise there is a risk of imbalance and burning damage.

• The waterproof cover of the power distribution board's wire terminal must be mounted, otherwise water ingress short circuit issues may occur.

• The four-eye mounting screws are hidden at the top of the radar, remove the film before disassembly and assembly to expose the screws.
• Not reapplying the film after repair affects aesthetics but not functionality.

• There is a locking screw on the radar line on the distribution board, ensure it is mounted during maintenance, it can protect the board during a drone crash.
• If this position is damaged after a drone crash, the distribution board can be left unchanged without affecting functionality.

Disassembly and Assembly Precautions (T100 Aircraft)

• If the laser radar dome is contaminated with pesticides, fertilizers, or dust, it may cause laser radar function anomalies. Suggestions:

1) Rinse with clean water first, then wipe the window with a clean, dust-free cloth or tissue;

2) If visible dirt remains on the window, gently wipe it with a cleaning cloth moistened with a small amount of alcohol.

• Do not use chemical agents like aircraft nose water for cleaning.
• As the lidar is a high-precision optical instrument, it is strictly prohibited to disassemble the laser dome privately, as this may lead to sensor failure due to dust ingress.
• When installing lidar cables, avoid excessive bending and interference. Otherwise, it may cause video transmission signal interference anomalies.

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Disassembly and Assembly Precautions (T100--Summary of Threadlocker Application)

T100 requires blue threadlocker on some screws:

1. Middle frame screw: YC.ST.LL000720.03

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2. Screw locking the large arm to the middle frame: YC.ST.LL000721.04

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3. Mount main shaft screws for large and small arms: YC.JG.QX004581.07, YC.JG.QX004654.03

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4. Mount propeller screws: YC.ST.LM000115.02

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5. Lock ESC mount to Aircraft Arm, lock ESC to ESC mount screws: YC.WJ.LL000232.02

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6. Lock Motor screws: YC.ST.LL000696.03

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Disassembly and Assembly Precautions (T100--Summary of Threadlocker Application)

T100 requires blue threadlocker on some screws:

Aircraft, Spraying, and Spreading Machine Testing Plan

Aircraft, Spraying, and Spreading Machine Testing Plan

Log Export

[Basic Issue]: Select this data for issues related to Aircraft operations, such as drone crash, spraying, or spreading anomalies; then check the data according to the anomaly time (most common);

[Transmission Issue]: Select this data for issues related to device upgrades, such as screen loss, then check the data according to the time;

[Aerial Survey Mapping]: Select this data for issues related to aerial survey mapping failures, then check the data according to the time;

[Charging Device Issue]: Generator or charger malfunctions, you can select this data and export all data.

Log Export

[Remote Controller Log]: Remote controller malfunction select this data

[APP Log]: App errors, crashes, lagging, etc., select this data

[Flight Record]: Flight record anomalies (missing, data mismatch), select this data

[Battery Log]: Battery malfunction, battery log can be exported

[Flight Controller Payloads Log]: Flight anomalies, collisions, Spreading System anomalies, all can be selected.

[Radar, Vision Log]: Radar, Vision System errors, Obstacle Avoidance anomalies select this.

[Camera, Gimbal Log]: Camera malfunction, blurry image

[Video Transmission Log]: Video Transmission anomalies, select this data

[Relay Log]: Relay unable to link, flashing light anomalies, etc.

Disassembly and Assembly & Testing Guide—Compatibility List

Disassembly and Assembly & Testing Guide—Compatibility List

Adapter Cable Description: There are two types of adapter cables:

1. Old charging device to T70P/T100 battery adapter cable(YC.XC.DD000597 Intelligent Charger Charging Cable):

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2. New charging device to T50/T25P/T40/T20P/T30 battery adapter cable:

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- Not yet released, expected to be available in this month, need to purchase from the sales part, please pay attention to subsequent official notifications.

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3. After-Sales Policies

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Part Four

After-Sales Policies - Warranty Policies

Similar to the T50, for detailed warranty period information, please refer to the DJI official website.

After-Sales Policies — Prohibit the use of third-party accessories.

Unauthorized installation of third-party accessories not certified by the official source may lead to aircraft malfunctions and void warranty.

After-Sales Policies — Prohibit the use of third-party accessories.

After-Sales Policies—Repair Strategy

After-Sales Policies—Repair Strategy

Component Principles & Repair Must-Check

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Part Six

Principle Introduction (T70P/T100 Spreading System)

Spreading Payloads Board

Load Sensor Module

Material Detection Motor

Spinner Disk Motor

Auger Motor

Auger Sensor

Principle Introduction (T70P/T100 Spreading System)

Component Principles & Repair Essentials - Principle Introduction (T70P/T100 Spreading System)

Load Sensor Module

Payloads Port

Material Detection Battery

Auger Motor

Spinner Disk Motor

T70P/T100 Spreading Payloads Peripheral Board Port Description

Component Principle & Repair Must-Check - Principle Introduction (T100 Aircraft)

Component Principle & Repair Must-Check - Principle Introduction (T100 Aircraft)

M1 signal cable

M4 signal cable

Four Eyes A

M2 signal cable

T100 Port Board Interface Description

Battery Power Supply & Communication

In-Position Detection

Payload

FPV Module

M3 signal cable

Laser Radar

Four-Eye B

DJI Assistant 2

Downward Radar

Upper Radar

Component Principle & Repair Must-Check - Principle Introduction (T100 Aircraft)

Component Principle & Repair Must-Check (T100 Aircraft)

Component Principle & Repair (T100 Aircraft)

The wiring method of T100 power distribution board

Payload communication port, connect to the power distribution board

Payload power supply port, connect to the payload

Battery power supply & communication, connect to the power distribution board

T100 power distribution board

Component Principle & Repair Must-Check - Principle Introduction (T100 Aircraft)

Component Principle & Repair Must-Check - Principle Introduction (T100 Aircraft)

Downward Radar

Rear Radar

Component Principle & Repair Must-Check - Principle Introduction (T100 Aircraft)

Component Principle & Repair Must-Check - Principle Introduction (T100 Aircraft)

Component Principle & Repair Must-Check - Principle Introduction (T100 Aircraft)

Component Principles & Repair Must-Check—Principles Diagram (T100 Aircraft)

Payloads Peripheral Module

Liquid Level Gauge

Flowmeter

Centrifugal Spray Rod

Solenoid Vent Valve

Impeller Pump

Component Principle & Repair Must-Check - Principle Introduction (T100 Aircraft)

Beacon Port

Liquid Level Gauge Port

Flow Meter + Delivery Pump Port

Rear Radar Port

Sprinkler Adapter Cable

T100 Payloads Peripheral Module Port Description

Component Principles & Repair Must-Check—Repair Must-Check (T70P/T100)

1. Check Propeller:

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1. Check if the propeller is broken, damaged, cracked, or delaminated; if so, replace the propeller;

Specific Method: Slightly lift the propeller and carefully check the leading and trailing edge areas for any fractures, damage, cracks, or delamination.

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2. Check if the propeller is loose.

Specific Method:

T100: Unfold the propeller, hold the propeller clamp with one hand, and grasp the end of the propeller with the other hand. Lift the propeller up or down to check if there is any noticeable looseness in the propeller relative to the propeller clamp (indicated by: the propeller root washer losing preload, and the propeller root being in a relaxed state).

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1) For T70P and T100 Aircraft, visually inspect the propeller shaft hole for severe wear and check for any visible cracks near the shaft hole. If present, replace the propeller; if not, check if the propeller washer is misshapen or damaged, and replace the washer.

2) For T100 Aircraft, inspect the propeller clamp limit structure. If there is a fracture or misshapen issue with the propeller clamp limit, replace it with a new propeller clamp for the user.

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3. Propellers must be replaced in pairs. When reassembling, use the appropriate screwdriver to tighten the propeller fixing screws (recommended torque value T100: 150 kgf*cm, T70P: 60 kgf*cm).

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Repair Must-Check (T70P/T100)

1. Before use, manually rotate the motor to check for any stalling, or if the rotor is loose or detached.

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2. Check if the motor and motor mount are shaking (no movement is normal).

Specific operation methods for 1 and 2:

1) Unfold the propeller, manually rotate the motor, and check if the motor stalls.

2) Unfold the propeller, hold both propeller blades with both hands and move them up and down, observing if the motor's fixed position and motor rotor are shaking.

3) Use a one-click Damage Assessment to test motor stalling issues, as an alternative to manually unfolding the propeller for testing.

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3. Check if the motor cover is misshapen, damaged, or blocked:

Misshapen criteria: Replacement is needed if there are 3-4 consecutive deformed air outlets on the side.

Damage Assessment Criteria: If the edge shows damage at the return vent, and the damage reaches the flat surface, replacement is needed;

Blockage Assessment Criteria: If any vent is blocked, it needs to be cleaned and cleared.

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4. Check if the motor base is misshapen, damaged, or if the vent is blocked.

Misshapen Assessment Criteria: If the side is misshapen causing the gap to be less than half of the initial value, replacement is needed;

Damage Assessment Criteria: If the side damage reaches the flat surface, or if there is damage on the flat surface, replacement is needed;

Blockage Assessment Criteria: If any vent is blocked, it needs to be cleaned and cleared.

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Note: During the handling of the power motor, do not lift the motor by pulling the wires.

3. Check the motor (T70P/T100):

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Motor top cover misshapen

Motor top cover damaged

Motor base damage

Motor base misshapen

Component Principles & Repair Must-Check (T70P/T100)

Visually inspect the following items, replace if there are any issues

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1. Check if the pad is missing or if the pad thickness is worn down to the plastic;

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2. Check if the plastic side edge is damaged or missing;

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3. Check if the roller/side roller is missing or stuck; if the roller pad is detached;

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4. Check if the metal hook side is misshapen, and if the battery plugs into the hook correctly

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5. Check if the battery side clips are broken or missing, and if the function is normal

4. Check the battery rail (T70P/T100):

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Pad wear

Plastic damage

T100 battery rail

Side roller missing

Roller wear

T70P battery rail

Pad wear

Component Principles & Repair Must-Check (T70P/T100)

1. Check if the battery port has verdigris corrosion and black dirt;

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2. Check if the power distribution board's current flow post has verdigris corrosion and black dirt;

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3. Check if the power distribution board power line screws are tightened to the specified torque, and do not apply glue to the screws;

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4. Clean the flow-through post and spring piece with alcohol and WD40;

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5. Recommended torque value for power distribution board power line screws:

T70 power distribution board torque recommendation: 25±3kgf*cm

T100 power distribution board torque recommendation: 30±3kgf*cm

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6. Recommended torque for ESC + three-phase line screws:

T100 and T70 series torque recommendation: 25±3kgf*cm

5. Power Distribution Board and Battery Port (T70P/T100):

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Dirty Case

(Needs Cleaning)

Corrosion case

(Needs replacement)

Burnout case

(Needs replacement)

Power Distribution Board Screw

Need to fully tighten

T70 power distribution board torque recommendation: 25±3kgf*cm; T100 power distribution board torque recommendation: 30±3kgf*cm

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Repair Must-Check (T70P/T100)

T100

1. Check for cracks at the rotating shaft of the buckle;

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2. Check if the secondary coupling of the Aircraft Arm is normal

Inspection method: After coupling the Aircraft Arm, lift the secondary board buckle upwards. If it pops open, the secondary coupling is ineffective;

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1) Check if the board buckle is damaged, and replace it if damaged;

2) If not damaged, check if the coupling of the Aircraft Arm is worn. If worn, replace the Aircraft Arm;

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6. Aircraft Arm Lever Inspection (T70P/T100):

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Check for cracks in the plastic around the illustrated bushing. If cracked, replacement is necessary.

After fastening the lever, lift Lever 2. If the lever pops open, it is abnormal.

Obvious cracks, abnormal

Minor cracks, no replacement needed

Repair Must-Check (T70P/T100)

Inspection method:

Visually inspect key areas for cracks

7. Radar Mounting Bracket Inspection (T70P/T100):

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T70P

Component Principles & Repair Must-Check—Repair Must-Check (T70P/T100)

T100

Check if the gap between the large arm and the frame is normal

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Inspection method: Shake the large aircraft arm up and down to check for significant movement, and visually inspect if the illustrated dent is exposed. If exposed, the large arm's rubber coating has hidden damage and needs to be replaced promptly to ensure flight safety.

8. Aircraft Arm Inspection (T100):

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Abnormal

Normal

Common Issues

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Part Seven

Common Issues - Spraying System (Pressure Liquid Level Gauge)

Liquid level gauge principle:

1. The water pressure in the spray tank compresses the gas in the internal hose, allowing the high-precision liquid level gauge sensor to receive the internal and external pressure difference.

2. After temperature adjustment (temperature affects air pressure)

3. The control board calculates the current capacity

Common Issues—Liquid Level Gauge Troubleshooting Manual (Issue 1-Issue 7)

1. Prioritize software calibration and firmware upgrade:

① Select the correct spray tank capacity

② Perform flow calibration in the settings interface

3. Ensure the aircraft and remote controller firmware are up to date

2. If the issue recurs after calibration, troubleshoot structural issues following the process below

Step 1: Remove the entire liquid level gauge:

1. Use a screwdriver to remove the three screws locking the liquid level meter, as shown in Figure 1;

2. Pull out the internal hose of the liquid level meter from the base, as shown in Figure 2;

3. Then remove the entire liquid level meter from the spray tank, as shown in Figure 3;

Step 2: Disassemble the liquid level gauge:

1. Remove the two transparent hoses from the liquid level gauge, check if the hoses are clear, ensure there is no blockage inside the hoses, maintain ventilation, as shown in Figure 4;

2. Check if the liquid level gauge's vent valve is blocked (the new liquid level gauge has removed the vent valve), as shown in Figure 5. If there is blockage due to liquid or water vapor, as shown in Figures 7 and 8;

Please unscrew the vent valve (the vent valve has a threaded hole and can be unscrewed counterclockwise), clean it thoroughly and let it dry (you can also use a hair dryer with cold air to dry it) before using it again, as shown in Figure 6;

3. Check if the external vent hole is blocked, you can use a hairdryer set to cool air mode to blow at the vent hole for 30 seconds, as shown in Figure 9;

Vent hole

Common Issues—Liquid Level Gauge Troubleshooting Manual (Issue 1-Issue 7)

Step 3: Disassemble the liquid level gauge base:

1. Unscrew the two nuts on the base of the liquid level meter, remove the base for inspection, as shown in Figures 9 and 10;

2. Check if the through hole in the base is blocked, and clean it thoroughly to maintain clarity, as shown in Figure 11;

3. During the inspection, ensure that the rubber gasket on the base is not detached, as shown in Figure 11;

Step 4: Remove the entire liquid level gauge:

1. Check if there is any chemical residue sticking to the spray tank cap vent valve, and clean it with water to keep the vent valve clear, as shown in Figures 12 and 13;

2. Check if the rubber stopper on the spray tank lid is blocked by liquid dirt, and clean it thoroughly, as shown in Figure 14;

When performing spraying operations, it is recommended to open the rubber stopper on the spray tank cap to ensure smooth air intake into the spray tank;

1. Finally, reassemble the liquid level meter back into the spray tank (as shown in Figures 15 and 16), retest to see if it recovers, and if not, it is recommended to replace it with a new liquid level meter;

Common Issues—Aerial-Electronics System (T70P/T100 Agriculture Drone Error: Flight Controller System Component Abnormality)

Issue Description

T70/T100 Agriculture Drone Error: Flight Controller System Component Abnormality

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Reason

1. Firmware Abnormality

2. FPV Fault Interfering with Aerial-Electronics Module

3. Aerial-Electronics Module Fault

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Solution

1. Please upgrade to the latest firmware version;

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2. Try restarting the aircraft to see if the related error disappears;

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3. If the error persists, check and replace the following hardware in order:

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(1. Replace FPV cables

(2. Replace FPV module

(3. Replace Aerial-Electronics Module

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If the issue cannot be resolved, collect basic issue logs and error pages for after-sales feedback

Common Issues—Propulsion System (T70P/T100 error message: XX ESC auto-check anomaly, unable to start the motor)

Issue Descriptions

T70P/T100 error message: XX ESC auto-check anomaly, unable to start the motor

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Reason

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The propulsion motor part may corrode due to long-term accumulation of pesticides, leading to defective insulation to the ground.

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1. Motor corrosion damage;

2. Corrosion damage to the connection wires between the motor and ESC;

3. ESC corrosion damage/ESC itself is damaged.

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Solution

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1. Prioritize replacing the motor at the error-reported location;

2. If the error persists after replacing the motor, it is recommended to troubleshoot as follows: ESC wiring connection status - ESC composite wire - ESC

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1) T100/T70 series error: ESC perform an auto-check exception (error codes: 0x007D, 0x007E, 0x007F, 0x0080): This error is caused by abnormal motor three-phase resistance values. Check and replace the motor on the corresponding error Aircraft Arm.

Common Issues - Propulsion System (T70 series Agriculture drone error: centrifugal motor obstruction)

Issue Descriptions

T70P/T100 error Tips: The centrifugal motor on Aircraft Arm X is obstructed, unable to operate.

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Reason

1. Firmware issue

2. Hardware issue

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Solution

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1. Upgrade to the latest firmware

2. Disassemble the centrifugal Sprinkler motor, check for internal blockages, and replace the centrifugal motor if blocked.

Common Issues (T70P+T100) - Continuously Updated

Common Issues (T70P+T100)

Common Issues (T70P+T100)

Common Issues - Component Compatibility (T70P+T100+T25P)

Common Issues - Component Compatibility (T70P+T100+T25P)

Common Issues - Component Compatibility (T70P+T100+T25P)

Thank you for your participation, thank you!

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