Jefftron Leviathan User manual

INSTALLATION MANUAL
FOR GEARBOX V2

1
Leviathan - V2 parameters
It is processor controlled mosfet with Bluetooth communication. Device is fully integra-
ted inside the gearbox version 2 instead of the original trigger contacts, compatible with
Tokyo Marui standard. Completely made wires with 30A mini fuse and deanT connector. It
adds new shooting modes, controls RoF, pre-cocking, active braking, low battery indica-
tion, statistics... controls via app in the smartphone. Usable for battery with max. 17 volts.
Insertion procedure of Leviathan-V2 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. Check
the gearbox for edges. Grind for smooth surface to prevent Leviathan board damage.
Package contents
- Leviathan - V2 drop-in module with wiring
- Screw with washer for securing device in
the gearbox
- CNC trigger with hair trigger feature
- Screw for the trigger zero path adjustment
- Foam to keep device in place
- Installation manual
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 - V2.

2
6. Make sure the screw doesn‘t stick out
outside of the gearbox. If yes grind it.
7. In the ICS gearbox grind edge in red
circle to not interfere with contacts.
5. Insert Leviathan-V2 in the place of
the original trigger contacts. Check if
it is laid at on the gearbox shell and
transparent foil covers socket contacts.
Adjust the position of the Leviathan to
same distance from bearing (arrows).
Use screw with washer from package
and screw device to the gearbox (whi-
te circle). Make sure the green areas are
not covered by board or wires.
4. If your gearbox has high screw
mounting, cut it o to at surface.
3. Take out these parts out of the gear-
box (not used with Leviathan - V2).

3
13. If you want shorter trigger path,
insert screw into the trigger. After tes-
ting secure its position by super glue.
12. Use trigger from package.
If you want use your trigger, grind it by
the red line on the picture.
8. Check other side of gearbox, if there
aren‘t any short circuits with gearbox.
11. Wires under motor have to stick on
the wall. Use super glue to x position.
9. Stick the foam to the right gearbox
shell (included in the package).
10. Place wires from the Leviathan-V2
in order: blue, -battery, -motor.

4
19. Secure the gearbox by 3 screws for
microswitch testing.
18. Check if the top board ts in the
gearbox without any problems.
14. Insert into the gearbox sector gear
and trigger from Leviathan package.
(avoid micro switches break).
15. Make sure the gear does not touch
micro switch body. Spin the gear slowly
to check right Cycle detection in the app
16. Put together the gearbox shell.
Check if it t together perfectly.
17. Grind pins in red circles to t wires
into the gearbox.

5
21. Put the gearbox into lower receiver,
secure its position by pins and screws.
20. Insert selector plate, move it from
front to back (avoid micro switch break)
Testing micro switches
1. Install„Leviathan by JeTron“app from iOS store or Google play into your smartphone.
You can also use link https://www.jetron.net/application
2. Connect battery to Leviathan - V2 and pair smartphone with the password„1234“.
23. Connect the black wire rst. Keep
in mind right motor polarity.
22. Black wire bends back at the bottom
and lead both wires back in the grip.

6
4. Set 2x new password and push SAVE.
Don‘t tell new password to anybody!
If you forgot your password, restore it
by holding RESET button - see pic. 7.
Battery has to be connected.
3. Change password to your 4 digit.
5. Check if every micro switch respon-
ding. Grey color is OFF, blue is ON.
There is slight delay in change micro
switch status because of BT commu-
nication. Micro switches are displayed
on picture 6 and 7 at page 7. With se-
lector on auto are semi and auto de-
tection ON (as on this picture).

7
7. Yellow reset button hold for 2s, pass-
word is reset to 1234 after vibration
from motor (settings is reset too).
6. Micro switches positions in red and
green circles. SAFE position is when
these micro switches are OFF.
Microswitch troubleshooting
10. If cycle is not detected move Leviathan-V2
slightly higher to be micro switch closer to sector
gear. If trigger doesn‘t press micro switch move
Leviathan-V2 front slightly lower.
When everything works right insert rest parts
into the gearbox and assembles the gun.
8. If is semi on safe, auto on semi move
Leviathan-V2 to the left or grind se-
lector plate on red line. Otherwise add
metal plate or dierent material on it.
9. Demonstration right SEMI and AUTO
selector plate position. On pic. 8. is SAFE

8
- Change name visible on the Bluetooth list, max.
12 characters. After you save the name, Leviathan
- V2 will be disconnected from phone.
- Info about application and rmware version.
Bootloader and Hardware version is constant.
- If you have any questions or problems, please
contact us at email support@jetron.cz.
- Update xes bugs and adds new features. It
takes about 1minute to complete. It will end with
successful message and short vibration.
First time shooting
1. Connect battery, after 1s you will feel a short vibration. This means that the power-up
self-test is complete and OK.
2. Put the gun into SAFE - nothing happen when is trigger pulled.
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-V2. If not, check what is written in the error log and the 12-14 pages in this manual
6. Pair with the leviathan-V2 and update rm-
ware to the newest version. Your smartphone has
to be connected to the internet.
Have your application and rmware updated!
WARNING - Disconnect battery, when you don’t
use the gun! Otherwise it will lead to destroy
battery or its re. Because Leviathan - V2 drains
small amount of current from it all the time.

9
Change parameters page 1/2
Orange stripe = not paired, green stripe = paired
Paired = loads parameters from Leviathan - V2.
Change parameter -> shows „writting...„ in the
green stripe. Text dissapear -> parameter is saved
Fire modes with Selector on safe/semi/auto:
- SAFE: no responding on the trigger pull.
- Semi: it res single shot per trigger pull.
- Semi/BurstX: short trigger pull res single shot,
long trigger pull res burst.
- Double trigger: re semi when trigger is pulled
and semi again when it is released in less than 3s.
- BurstX: gun shoot burst per trigger pull.
- BurstX+BurstY: short trigger pull re burstX,
long trigger pull re burstX plus burstY bullets.
- BurstX/Full: short trigger press res burstX, long
trigger press makes auto re.
- Full: gun makes auto re until trigger is released.
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 with too high gun
RoF. This function makes breaks between shots to
reduce RoF. It gives you fast trigger response even
with very low rate of re, just like in a real gun.

10
Change parameters page 2/2
Active Brake:
It uses the excess energy from the motor to stop
it. Lower braking intensity spares the motor coils.
Spring is fully released, parts in gearbox aren‘t
under strain. Higher power braking is suitable
for weapons with high RoF. The eect is the most
powerful with torque motor.
Pre-cocking:
The piston is partly compressed after re on SEMI.
Max. compression is about 70% intensity (de-
pends on the gun setup). There isn‘t almost any
delay between trigger pull and shot. Pre-cocking
works only with active brake. If you hold the trig-
ger after ring at least 3 seconds, gun shots again,
but this time with a piston in a released position,
use it before store the gun. Please note: using pre-
cocking increases wear and tear on the gearbox.
Delay between shots:
It is for simulation the delay from gun reload or recoil. In this time is not possible to shoot
again. Motor vibrates shortly after pass time delay to notify the gun is ready for shooting.
Low Battery Indication:
It is used for only Li-xx batteries. When is low battery voltage detected, gun vibrates after
each shot. It is time to replace the battery at the nearest opportunity. When the battery
is discharged the gun vibrates instead of re. WARNING: battery is still slowly discharged.
SAVE: You can save these parameters under custom name into your smartphone.
FACTORY RESET: It restores parameters to factory state (password is unchanged).

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Battery voltage: It shows actual value.
Red color line indicates when gun won‘t
shoot. In yellow it will shoot with war-
ning vibration. In green is everything OK
and grey is discharge from 100% charge.
BB counter: They are shots counters.
Total - count every shot during lifetime
User - can be reset by user anytime
Error log: It shows errors made during
the device life. Error at the top of list is
the newest one. More info at page 12.
Proles: At this page are saved proles.
„Select“ will upload settings to device.
Power-up - battery connection reset it

12
Startup codes
After connecting battery Leviathan - V2 does a power up self check, which lasts a 1s.
It results the motor vibration or error beeps with the error log record:
1 short vibration - All systems are OK. This vibration is about half second long.
1 short beep - Trigger is pressed during battery connection (102)
2 short beeps - High current ow the mosfet (106)
3 short beeps - High temperature on the mosfet (104)
1 long beep - Battery voltage is less than 5.5 volts (107)
2 long beeps - Battery voltage is more than 17.0 volts (105)
3 long beeps - High processor temperature (108)
short-long-short beep - Motor is disconnected (109)
long-short-long beep - Nonfunctional application (200)
Post ring codes
If any problem occurs during ring, it will be signaled by beeps with the error log record:
1 short beep - Micro switch for sector gear is pressed after the motor stop (100)
short-long beep - Micro switch for sector gear isn‘t pressed after the trigger pull (103)
2 short and long beep - Selector plate has moved during shooting (101)
2 short beeps - High current ow the mosfet (106)
3 short beeps - High temperature on the mosfet (104)
1 long beep - Battery voltage is less than 5.5 volts (107)
3 long beeps - High processor temperature (108)
1 vibration after shot - Battery voltage is low. If the battery drops much further, the gun
will vibrate instead ring. Now it is a good time to change your battery for new one.
1 vibration instead of re - Battery is discharged. The gun vibrates on every trigger pull.
change your battery for new one. WARNING: battery still slowly discharging.
1 vibration after some time - When is delay between shot activated, it vibrates after the
delay time ends. It is for notication the gun is ready for shooting.

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Troubleshooting
ISSUE: Weapon doesn‘t react at all after battery connection.
SOLUTION: Check if the battery is properly connected and charged. Also check motor
contacts and motor functionality. Check if the safety fuse hasn’t been blown.
ISSUE: Weapon doesn‘t make shots after trigger pull (start-up vibration was made).
SOLUTION: Damaged or misplaced micro switch for trigger, check it‘s proper function.
ISSUE: Selector is set to semi but act like on SAFE or AUTO (or any other combination).
SOLUTION: Damaged or misplaced micro switch for selector plate, check its proper functi-
on through micro switch check page in the app and correct selector plate shape
according page 7 in this manual.
ISSUE: Micro switch for sector gear is pressed after motor stop (Error 100).
SOLUTION: Gun have too high rate of re and piston make over spinning. Solve it by incre-
asing active brake or reducing pre-cocking (if used) or reducing rate of re or use
battery with lower voltage or change gear ratio or use low speed high torgue motor.
ISSUE: Selector plate has moved during shooting (Error 101).
SOLUTION: You have changed by mistake re selector during shooting or it was changed
by vibrations from shooting. Check microswitches through app, if they change sta-
te too close the selector position, modify selector plate shape to change it further.
ISSUE: Trigger is pressed during battery connection (Error 102).
SOLUTION: Release the trigger and try again. Check for right trigger microswitch function.
ISSUE: The gun always shoots BURST with short-long beep after re (Error 103).
SOLUTION: Cycle micro switch doesn‘t detect sector gear motion. Use micro switch check
function to move cycle micro switch to the right position detecting edte at the gear.
ISSUE: High temperature on the mosfet (Error 104).
SOLUTION: Wait until temperature will be dropped down. If it repeats, mosfet is overloa-
ded by too high Amps. Change gearbox internals to drain less amperage.

14
Troubleshooting
ISSUE: Battery voltage is too high (Error 105).
SOLUTION: Change battery with less voltage than 17.0 volts.
ISSUE: High current ow the mosfet (Error 106).
SOLUTION: Check if motor or gears is damaged or jammed. Also check wires to motor for
short circuits or exposed connections.
ISSUE: Battery voltage is too low (Error 107).
SOLUTION: Change or charge battery to have more voltage than 5.5 volts.
ISSUE: High temperature on the processor (Error 108).
SOLUTION: check for short circuits on the leviathan-V2 through the gearbox.
ISSUE: Motor is disconnected (Error 109).
SOLUTION: Check contacts for the motor, if they aren‘t damaged or disconnected.
ISSUE: Nonfunctional application (Error 200).
SOLUTION: Program error in the Leviathan-V2. Update rmware to the newest version.
ISSUE: Gun suddenly stopped ring.
SOLUTION: Protection could be activated - check error log. Check battery charge. Check
motor contacts and motor functionality. Check if the safety fuse hasn’t been blown.
ISSUE: Leviathan - V2 is not visible in the device list in the application.
SOLUTION: Click t orefresh button in the app. Check if it is charged and connected battery
into the Leviathan-V2. Enable Bluetooth and GPS in your phone. Restart mobile app.
ISSUE: You programmed Leviathan - V2, now it doesn‘t do what you wanted.
SOLUTION: Best way is to do FACTORY RESET and start again.
ISSUE: The gun does something strange or nothing.
SOLUTION: STOP! Release trigger, disconnect battery and search for the problem before
something will be irreversibly damaged! Contact us at email support@jetron.cz.

MANUFACTURER
Ing. Filip Němec
Zahradní 599, 538 03 Heřmanův Městec
ID: 87936062, TAX ID: CZ8503013475
Made in Czech Republic
www.JeTron.net
Warranty does not cover: water immersion,
defects or damage from accident, misuse,
opposite battery polarity, abuse, damaged
wires, wrong installation, bad handling,
any modication by user, unusual physical,
electrical or electromechanical stress.
Exclusion of liability: Manufacturer Ing. Filip Němec is not lia-
ble for any damages, injuries or accidents of any kind resulting
from the use of this product in the airsoft gun.
VERSION 5.19