Troubleshooting for T238 Light sensorversion DTU for Gearbox V2
| Fault | Fault Analysis | Solution |
| No reaction after connecting the battery |
The connection of motor or battery is abnormal |
Please use brushed 480 motor andbattery which the voltage is higher than7.4V ， make sure battery and motor is functional，reconnect motor to make surethe circuit is closed then test the DTUwith battery |
| Only pre-loading function works |
1.The connection of motor is abnormal 2. Fault of motor |
Please confirm motor and gearbox arefunctional，reconnect motor then test theDTU with battery |
| Magazine keeps feeding after it is attached |
For DTU with pre-loading function ， circuit for pre-loading function maybe overload For DTU without pre-loading function， negative of magazine could be connected improperly |
1.Automatic pre-loading function is disabled, please return it to retailer for repair 2.For DTU without pre-loading function, the negative wire of magazine shouldbeconnected to negative of motor insteadof negative of battery |
| Magazine cannot feed gel/BB |
Fault of magazine Fault of gearbox Diameter of gel is improper Power supply wire of magazine anomaly |
Please reconnect terminals for magazine, make sure the connection betweenmagazine power supply and DTUis functional, then do troubleshooting for magazine/gearbox/ diameter of gel suchexternal factors. |
| Only 2 long ‘beep’ after battery is connected，no reaction after the trigger is pulled |
2 long ‘beep’ means DTU is entering programming model. It means trigger is pulled while selector plate is at ‘auto’ position. If trigger is not pulled，it means the trigger cannot block sensor while it is released，DTU detects that trigger is pulled. |
Trigger cannot block sensor whilereleased is because that the slot of trigger is too large, or the left surface of trigger is too far away from the trigger sensor onthe DTU. Please modify the shape of trigger then thicken the right surface5-6mm to reduce the gap, so the trigger can block sensor |
| 1 long ‘beep’ following by 3 short ‘beeps’ after battery is connected, no reaction after the trigger is pulled | One long ‘beep’ following by 3 short ‘beeps’ indicate that DTU is entering ‘quick’ model, it means trigger is pulled while selector plate is at ‘semi’ position. If trigger is not pulled ， it means trigger cannot block sensor while it is released ，DTU detects that trigger is pulled. | Trigger cannot block sensor whilereleased is because that the slot of trigger is too large, or the left surface of trigger is too far away from the trigger sensor onthe DTU. Please modify the shape of trigger then thicken the right surface5-6mm to reduce the gap, so the trigger can block sensor. |
| Only 3 short ‘beeps’ after battery is connected, no reaction after trigger is pulled | 3 short ‘beep’ means the DTU has Entered shooting mode successfully, it means initialization of DTU is successful. No reaction after the trigger is pulled might be caused by that trigger sensor is blocked by wires or other things or the travel of trigger is not enough to reach the trigger sensor or the trigger sensors on upper and lower circuit boards are broken. | Please investigate wires of gearbox thenclean trigger sensors on both sides of circuit boards；Since travel of trigger might not be enough，it is neededtomodify the trigger limit of trigger ongearbox to make the trigger is able toreach the trigger sensor ；If it is impossible to observe the surface of trigger is normal or not. Please try to remove the trigger and assemble the upper circuit boardand attach the motor then connect battery. If it is 2 long ‘beep’ or a long‘beep’ following by 3 short ‘beep’, it means trigger sensor is functional. Otherwise, trigger sensor is down |
| 4 short ‘beep’ | 4 short ‘beep’ is the warning for low voltage warning，it means battery is out or the setting for battery protection is wrong. | Fully charge battery ，then set the first term to 5 before testing with battery |
| ‘semi’ mode only | There is a ‘beep’ while changing mode. If there is no such ‘beep’, it means selector sensor which is at ‘auto’ position cannot detect white are on the selector plate. This means the position of stick on selector plate is not rear enough or the black on the sticker is too much or the surface of the white sticker is too far away from selector sensor | The effective distance is 0.5-2mm, pleasemake sure the sticker on the selector plate is in between this distance; If whitearea is not accurate, it is recommendedto attach a new sticker on it, do not blacken it first. If there is only ‘auto’ mode, blacken the sticker 2mmonceuntil the position of ‘semi’ mode is accurate. |
| ‘auto’ mode only | There is a ‘beep’ while changing Mode. If there is not, it means DTU detects white area at ‘semi’ position, the black area of selector plate is not enough | The effective distance of selector sensor Is 0.5-2mm, please make sure the sticker on the selector plate is in between this distance ； If there is only ‘auto’ modewhen the gearbox is assembled in thegearbox, please blackening the sticker for 2mm once until the position of selector is precious |
| Long ‘Beep’ after Motor rotates few rounds |
Long ‘beep’ is the alarm for motor stall ， DTU detect gears are not rotating, it could be: 1. Motor does not drive gears rotating 2. Gear sensor is dity 3. Alignment of upper and lower circuit boards is incorrect 4. Discharge of battery is not enough 5. Gear sensor is down |
Please clean gear sensors on both sides of circuit boards, Change the battery toabattery with higher discharge rate (Higher than 1100mah 25C). Please check and modify bulge inside the gearbox in caseit interfere the installation of DTU(Alignment of upper and lower circuit board) then reinstall the DTU and test |
| Motor heating | Frequent motor heating is mainly caused by high start and shut current and frequent shut. Active Brake of DTU needs to transfer the kinetic energy to heat energy for brake. It is related to the performance of motor; heating of motor is normal phenomenon, and it is unavoidable. | Set the position of piston to 4 or higher inprogramming model can reduce or closeactive brake function to reduce motor heating. In addition, change the motor to high torque and low RPMones canalso reduce motor heating. |
| Battery heating | Critical battery heating is mainly caused by that the torque of motor is not enough for load or load is too large. Normally, it is because gears are too tight or the main spring is too strong；it could also be caused by discharge of battery is not enough or it is at overloading status for a long time | Battery with higher discharge rate andcapacity is recommended. In addition, connector for battery, it is recommendedto use XT30 or mini-Tamiya connector. Investigate the tightness of gears, thestrength of main spring and smoothness of gearbox. Change the motor toahigh-torque one can relieve this issue. |
| Critical wire heating | Critical heating of wire is because torque of motor is not enough for load or the load is too much (Gears are too tight or main spring is too strong)；It could also be the discharge rate of battery is not enough or the battery is at overload situation for a long time | Battery with higher discharge rate andcapacity is recommended. In addition, for connectors of battery, it is recommendedto use XT30 or mini-Tamiya connector. Investigate the tightness of gears, thestrength of main spring and smoothness of gearbox. Change the motor toahigh-torque one can relieve this issue. |
| Firing instantly after battery is connected | FET chip has damaged | Please investigate battery connectors andmotor connectors are reversal or not. Please check is there a short circuit or damage on wires or circuit boards ，Please contact after-sales for solution |
| DTU burn down instantly after battery is connected | Battery is connected reversely | Please check the connector of battery is Reversal or not，Please contact after-sales for solution |
| DTU burn down instantly after trigger is pulled | Polarities of motor (Gearbox) are connected reversely Short circuit occurs on the wire that connects motor | Please check connector of motor is reversal or not, is there a short circuit or damage in wire，Please contact after sales for solution. |
| Motor keeps working after trigger was released | Trigger cannot block trigger sensor while it is released, the DTU detects that trigger is not released. | Trigger cannot block sensor whilereleased is because that the slot of trigger is too large, or the left surface of trigger is too far away from the trigger sensor onthe DTU. Please modify the shape of trigger then thicken the right surface5-6mm to reduce the gap, so the trigger can block sensor. |
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