Jefftron LEVIATHAN NGRS User manual

INSTALLATION MANUAL
FOR TOKYO MARUI NGRS

1
Package contents
- Leviathan-NGRS drop-in module with wiring
- 2x screw and pads to secure it in the gearbox
- 2x Foams to keep device in the place
- Sheet with selector plate stiskers
- 40A fuse, 2x faston, T-Plug, red wire, heat-
shrinks to nish wiring at the battery end
- Leviathan black 40mm round sticker
- Installation manual
Leviathan - NGRS parameters
- It is processor controlled mosfet with wireless communication.
- Device paramethers is changed with smartphone via application (Android and iOS).
- Device is fully integrated inside the gearbox instead of the original trigger contacts.
- It can be tted into these Tokyo Marui Next Generation guns: M4, SCAR, HK416, HK417.
- It has wires to stock (loose end), mini 40A fuse and deanT to solder after gun assembly.
- It adds new shooting modes, controls RoF, pre-cocking, active braking, virtual magazine,
input and output ports, electronic fuse, low battery indication, statistics...
- Usable for battery with max. 17 volts (max. lipol 4S 14,8V).
Safety warning
- Installation of this device into the gearbox requires advanced technician skills!
- Please read these informations before installing your device to prevent any damage.
- Short circuit or incorrectly connected battery will cause immediate damage to the de-
vice which is not covered by the warranty. It can lead to re or even battery explosion.
- Disconnect battery, when you aren‘t using the gun! Otherwise you will fully discharge
the battery. Because the device drains small amount of current from it all the time.
- Don‘t connect battery when gun pointing towards you, another person or an animal.
- Don‘t modify, repair, put into any kind of liquids or thermal shock the Leviathan.

2
Device overview
- Tactile trigger micro switch is in the red circ-
le, button travel is only 0.13mm.
- RFTS = Real Feel Trigger System was made
by professional gunsmith for more realistic
feel from shooting. This spring simulates
trigger resistance. You can bend its end to
change resistance.
- Pink micro switch detects empty magazine.
- Optical sensor for the sector gear is in the
green circle, it detects gear cam movement.
- Yellow reset button hold for 2s, password
is reset to 1234 after vibration from motor
(settings are reset too).
Optical sensor is for detection SAFE, SEMI
and AUTO position. It is shown in the red
circle. For its function is neccessary to pla-
ce sticker on the selector plate.

3
External ports
Input terminal
- Leviathan has 3 pads for connecting
external button, virtual reload or sensor.
- 3,1V is in the red area (for sensor only).
- Signal is in the yellow area.
- Negative pole is in the green area.
- External button connects on SIG and
GND pad (doesn‘t matter on polarity).
- In the app use interface „External input“
to activate desired function.
Output terminal
- Leviathan has 2 pads on the board
for powering hop-up LED illumination,
ashlight, laser, magazine motor etc.
- On the Positive pad is battery voltage
(in the red area).
- Negative pad from the motor is in the
green area, the power is fully driven
throuht the Leviathan microprocessor.
- In the app use interface „External out-
put“ to activate desired function.
- Some input functions activates output
terminal even on OFF status.
WARNING: Installation requires advanced soldering skills! Wires can‘t touch other pads
and components on the board. Damage to the Leviathan will void the warranty!

4
Insertion procedure of Leviathan-NGRS into the gearbox
1. Remove and open the gearbox according to the normal gun disassembly procedure.
2. Take out all the internals from the gearbox and clean the vaseline, oils after them.
3. Check the gearbox for edges. Grind for smooth surface to prevent Leviathan damage.
4. Take out these parts out of the gear-
box (not used with the Leviathan).
5. Remove other internals from gear-
box. Prepaired gearbox for installation.
6. Grind these 2 pins to at, it is nece-
ssary to t wiring inside the gearbox.
7. Make 2mm gap into the red area to
insert wiring through this gap.
Gearbox shell modication
Stock gearbox modicaion is necessary to t Leviathan wiring without damaging them
- see pictures 6 and 7.
Please skip this part, if you already bought CNC gearbox from Retroarms, because it
has enough room for the wiring.

5
9. Insert the Leviathan-NGRS instead of the original contacts:
- Check if the Leviathan-NGRS is laid at on the gearbox shell.
- Adjust the Leviathan position to the same distance from sector gear bearing (red circle).
- Use screws with washers from package and screw device to gearbox (white circles).
7. Keep in place transparent foil, it pre-
vents from short circuit through gearbox.
8. Unplug Leviathan top board from
the bottom - all jumpers at one time.
UNIQUE
SERIAL NUMBER

6
13. Wires under motor have to stick
on the wall. You can use hot glue to x
their position in the gearbox.
12. Place wires in order: blue, -battery,
-motor. Keep clear green hole for pin.
10. Make sure the screws doesn‘t stick
outside of the gearbox. If yes grind it.
11. Check if there are any parts contact
with the gearbox around the red area.
14. Overall view to the wiring in gearbox.
15. Stick 2 foams to the right gearbox
shell according this image (foams are
included in the package).

7
17. Carefully insert the trigger into
the gearbox. Trigger spring has to be
outside the gearbox.
16. Carefully plug top board into the
bottom. Watch for right jumpers position
otherwise Leviathan could be damaged.
18. Push the trigger spring into the
gearbox by screwdriver or pliers.
19. Lube the top part of the trigger by
small amount of vaseline (for RFTS).
20. Check sector gear height, it can‘t
touch the optical sensor or screw.
21. Insert the remaining parts into
the gearbox. Put together the gearbox
shell. Check if it ts perfectly together.

8
22. Assemble empty magazine
detection system and check its right
interaction with micro switch.
25. If you want functions on SAFE posi-
tion, cut the selector plate in red area.
Mechanical locking will be disabled.
23. Take out one of 12 stickers by pliers.
Do not touch the sticker by hand!
24. Clean selector plate by degreaser
and place sticker the to the white area.
26. Black wire bends back at the
bottom and lead both wires back.
27. Bend both motor connectors
exactly like on the picture.
Do not bend it to the other site!

9
28. Connect the black wire rst. Keep
in mind right motor polarity.
Motor has opposite position now.
29. If you want to use original battery
connector, cut wires in this place and
solder them to the connector.
30. Also you can use this Leviathan set
for T-plug connector.
31. Squeeze faston connector around
red wires with pliers and solder them.
32. Use lighter or hot air gun to shrink
tube around the spade connectors and
connect both of them to the fuse.
33. Shrink large tube around the fuse
and wires. Solder black and red wire to
the T-Plug connector.
KEEP IN MIND RIGHT POLARITY!
KEEP IN MIND RIGHT POLARITY!

10
4. Change password to your own 4 digit.
5. Set 2x new password and push SAVE.
Don‘t tell the password to anybody!
If you forgot your password, restore
it by holding RESET button for 2s - see
page 2. Battery has to be connected.
2. Connect the battery to the Leviathan
and pair it with your smartphone.
3. Use default password„1234“.
You can save it by checking the box
“Remember password.
Sensors conguration and testing
1. Install „Leviathan by JeTron“ app from App store (iOS) or
Google play (Android) into your smartphone.
Or use link https://www.jetron.net/application (QR code).

11
Optical selector calibration
6. Tap on„Optical selector calibration“. 7. Follow instructions in the calibration.
Move the selector plate to Safe, its
value should be in range 6% - 30% and
press continue.
Move selector to Semi (range 40%-70%)
and press continue.
Move selector to Auto (range 80%-99%)
and press nish.
Try right Semi and Auto responses in
the„Sensor check“ function. Blue is ON.
SAFE is when Semi and Auto is inactive.
8. At the end every selector position has
to end in the green color. If not, go to
the page 13 to solve the problem.

12
Optical cycle calibration
9. Tap on„Optical cycle calibration“.
11. After the shot, this page appears.
Cycle detection point determines when
cycle is detected. Higher value = sooner.
Cycle range shows sensor reading when
sector gear is spinning. Ideal range is
10% - 90%. It works perfectly even with
a range dierence of only 20%.
Automatic cycle calibration sets cycle
detection point when error 103 appears.
Cycle detection blinks when a sensor de-
tects sector gear complete cycle.
Light intensity lowers the cycle range if
it is too high. For update shoot again.
10. Follow instructions in the calibrati-
on. Make sure no BBs are in the gun!

13
Sensor troubleshooting
First time shooting
1. Connect battery, after 1s you will feel a short vibration - power-up self-test is complete.
2. Put the gun into SAFE-nothing happen on trigger pull (if was done selector plate mode).
3. Put the gun into SEMI and it will re once.
4. Put the gun into AUTO and pull the trigger shortly. Gun should re a burst of 3 rounds.
If you held down the trigger longer the gun will go to auto re.
5. If everything works as described, congratulations for the correct installation the Levi-
athan. If not, check what is written in the error log and the 20-22 pages in this manual
6. Pair phone with Leviathan and update rmware to the newest version.
Keep your app and rmware always up to date!
13. If any selector position ends in the red
color, its value is too close to another one,
so the position won‘t be set right.
This could be caused by wrong sticker po-
sition or dirt on selector plate or sensor.
It is also possible you didn‘t change se-
lector position during calibration process.
12. If cycle range has too high values,
move sensor slightly higher to be closer
to the sector gear.
If cycle range has too low values, move
sensor slightly lower to be further from
the sector gear or clean the sensor.
For that operates with screw in red circle.
WARNING: Disconnect the battery, when the gun is not in use! Leviathan drains small
amount of current from the battery all the time so it will overdischarge the battery.

14
Change parameters page 1/3
Orange stripe = not paired, green stripe = paired
Paired = loads parameters from Leviathan.
Change parameter -> shows „writting...„ in the
green stripe. Text dissapear -> parameter is saved
Fire modes with Selector on safe/semi/auto:
- SAFE: No responding to the trigger pull.
- Semi: It res a single shot per trigger pull.
- Semi/BurstX: A short trigger pull res a single
shot, a long trigger pull res a burst.
- Binary trigger: Fire semi when a trigger is pulled
and semi again when it is released in less than 3s.
- BurstX: Gun shoot a burst per trigger pull.
- BurstX+BurstY: A short trigger pull re burstX,
a long trigger pull re burstX plus burstY bullets.
- BurstX/Full: A short trigger pull res burstX, a
long trigger pull makes an auto re.
- Full: Gun makes auto re until trigger is released.
- Virtual reload: Pull trigger to reload virtual mag.
- Activate output: Pull trig. to turn ON Ext. output
Burst functions:
It enables you to shoot a set number of BBs on one
trigger pull. It will always complete the burst. Eve-
ry selector has its own burst settings.
Rate of re:
It is useful for solving problems when RoF is too
high. This function makes breaks between shots
to reduce the RoF. It gives you fast trigger respon-
se even with a very low RoF, just like a real gun.

15
Change parameters page 2/3
Active Brake:
It uses the excess energy from the motor to stop it.
Spring is fully released, parts in gearbox aren‘t under
strain. Higher braking is for weapons with high RoF.
Braking eect is more powerful with torque motor.
Note: Lower braking intensity spares the motor coils.
Pre-cocking:
The piston is partly compressed after SEMI re. There
isn‘t almost any delay between trigger pull and shot.
Recommended compression is about 65%. Holding
the trigger for 3 seconds, gun shots again with de-
cocked piston - use it for storing the gun after game.
WARNING: it increases wear and tear on the gearbox.
Delay between shots:
It is for simulation the delay from gun reload or recoil.
During delay gun can‘t shoot. After dealy gun vibra-
tes shortly to notify the gun is ready for shooting.
Electronic fuse:
Set sensitivity for high current detection to avoid any
damage if something goes wrong. We recommend
to set 10A above average auto current reading from the statistics.
Low Battery Indication:
It is used for only Li-xx batteries. Choose right battery type or it will not work properly.
When is the low battery voltage detected, gun vibrates after each shot. Now it is good
time to replace the battery at the nearest opportunity.
When the battery is discharged the gun vibrates instead of ring for battery protection.
WARNING: Leviathan drains small amount of current from the battery all the time!

16
Change parameters page 3/3
External input - see manual at page 3:
- OFF: Every signal to Input terminal is ignored.
- Activate output: Ext. output is ON when input is ON.
- Toggle output: Input act like a switch to Ext. output.
- External trigger: Gun trigger is disabled and repla-
ced by micro switch connected to Input (SIG and GND)
- Burst-3 trigger: Switch on SIG and GND makes 3
burst re when it is pressed. Gun trigger is functional.
- AUG trigger: Selector plate detection is disabled.
Gun trigger is set to selector on semi. Micro switch co-
nnected to Input (SIG, GND) is set to selector on auto.
- Empty mag (NO): Micro switch activates empty ma-
gazine detection, when is connected SIG with GND.
- Empty mag (NC): Inverted function Empty mag (NO)
- Virtual reload: Micro switch activates virtual maga-
zine reload, when is connected SIG with GND.
External output - see manual at page 3:
- OFF: It works only if the Input terminal activates it.
- Motor: It is ON with gun motor + with IN activation.
- Motor + Xs: It is ON with gun motor with time delay.
- Always on: The output is constantly activated.
Virtual magazine:
Value sets number of shots (70bb here). Gun will stop shooting when virtual mag. reach 0.
Near empty magazine - makes 2 short beeps after each shot before virtual mag. is empty.
Reload delay -is time when gun can‘t shoot after empty mag. or it is triggered by„Virtual
reload“ (through input port - set as re mode or change selector position - there and back)
Save or Save as: You can save these parameters under custom name into your app.
FACTORY RESET: It restores parameters to factory state (password is unchanged).

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Proles: At this page are saved proles.
„Select“ will upload settings to device.
Power-up - battery connection reset it
Sensor check:
Shows how the sensors respond. Grey
colour is OFF, blue is ON. Sensors are
displayed on page 2. With selector on
Safe are Semi and Auto detected as OFF.
Shot counter: records full gear spin.
Total - counts every shot during a lifetime
User - can be reset by user anytime
Error log: shows the errors made during
the device life. A total shot counter value
is saved when an error happens. Error
expansion shows a possible solution.
Bin at the top corner will reset all errors.

18
Statistics
Rate of re (sec): Gun rate of re per second.
Rate of re (min): Gun rate of re per minute.
Last trigger pull shots: The number of BBs red at
the last trigger pull.
Pre-cocking time: Time to move piston to compre-
ssed position (it will reduce a Semi cycle time).
Semi cycle time: Time between motor start and a
piston release.
Auto cycle time: Time between shots in a burst
where the RoF has already reached its max. value.
Motor start current: Peak current when the motor
starts spinning.
Average semi current: Current during the rst shot
Average auto current: Current during burst re.
Mosfet temperature: Actual mosfet temperature,
the cut-o temperature is 75 °C.
Processor temperature: Actual processor tempera-
ture, the cut-o temperature is 75 °C.
Signal strength: Shows the signal strength, the
smaller the dBm drop, the stronger the signal.
Battery voltage: It shows actual voltage value. Red
color line indicates when gun won‘t shoot. In yellow
it will shoot with warning vibration. In green is eve-
rything OK and grey is discharge from 100% charge.
Power up time: how long is the battery connected.

19
Settings
Language: Text translation in the app to dierent langu-
age. Tacticool language is made up for your fun.
Dark theme: Choose white or black app interface.
Temperature: Change mosfet and processor tempera-
ture unit from °C to °F.
Remember password: Set automatic login to Leviathan.
Turn o connection by re selector: If it is ON, then wi-
reless connection will be turned OFF/ON by fast change
selector from Semi to Auto and back. It is good for gun
security. It always turns ON when the battery is plug-in.
When this function is disabled you can always connect.
Overspin detection (Error 100): It will turn o the beep
at error 100 (over spinning = double shot).
Sound signalization: Allow/deny sounds when maga-
zine is empty, delay between shots and virtual reload.
Full auto limit: It is safety feature. It cut o power after
100 bb continuous burst on the FULL auto re.
Information: Info about app and rmware version.
Bootloader and Hardware version is constant.
Device name: Is visible on the list with devices (max. 12
characters). It disconnects from phone after saved name.
Device password: Write to the rst row old password
and to other two new password (4 digits) and push SAVE.
Device update: Fixes bugs and adds new features. It
takes cca 30s to nish = successful message + vibration.
Installation manual: Link to the latest manual in .pdf.
Support: If you have any questions or problems, please
contact us via email: support@jetron.cz.