Grizzly PSJ-M2 gen3 User manual


Content:
1) GEN.3 news overview
2) Basic information
3) Function overview
4) Technical parameters
5) PSJ-M2 installation
6) Fire modes and settings
7) Troubleshooting
8) Package content
1. GEN.3 news overview
easier unit installation
easier magnet installation, doesn´t matter on magnet‘s polarity
lower energy consumption, from 3,9mA
unit useable up to spring M200 and rate of fire 99rpm
longer wiring, suitable for all weapon types
rate of fire setting
switchable active brake
adjustable power of active brake
usable for batteries up to 4S –16,8V
added screw for unit attach into gearbox
new, thicker isolation foil against short circuit
possible usage of dual sector gears
varnish coated to protect aganist short circuit
service conector
2. Basic information
New generation of PSJ processor unit brings many new functions and easier installation. All the great function of
previous generation are kept - completely contactless switching by magnets combined with powerfull MOSFET
cooled by whole gearbox, active break fully functional in any mode set, programmable burst. Plus you will find new
switchable active break that works in all fire modes, new rate of fire setting and lower energy consumption from
3,9mA and many more new functions.
This unit is suitable for all AEG replicas with gearbox version II. It was tested in gearboxes of following
manufacturers*:
AimTop, APS, ASG Ultimate, Cyma, DBoys, Guarder, RetroArms, SHS, SRC
*Every manufacturer inovates their products in time, so there is possibility, that our tested gearbox is different from yours. However this only
means, that your installation might require some minor adjustments of unit or gearbox, see figure 4.2.
3. Functions overview
3.1. Fire modes
6 preset fire modes
allows you to set burst mode from 1 up to 255 shots on one trigger press, this setting works in all modes
containing burst
automatically switches from burst to full auto without any delay
modes are fully programmable by trigger itself (see figure 5.2.)
3.2. Rate of fire
allows you to set delay between two following shots
allows smooth rate of fire setting
programmable by trigger (see figure 5.2.)

3.3. Special functions
reset to default settings - you can simply reset all settings to their default values by trigger (see figure
5.2.)
manual mode - if your PSJ indicates damage and you are sure it is not mechanical and your replica is able
to shoot, you can access manual mode, in which malfunction is ignored and you can fire on full auto mode
only - see figure 5.4 (WARNING! By poor judgement, you can cause more damage to your replica and the
unit!)
3.4. Mos-fet
no mechanical switch, everything is contactless
faster trigger response
increases rate of fire as well as battery life
maximum current up to 202A constant and 808A in peek
3.5. Active brake
active brake turn-off possibility
settable active breaking by 10%
when brake setted on 100% stops motor immediately with piston in default position and spring loose
increases lifetime of piston, spring and many other parts
always finishes whole rotation of gear wheels
fully functional in all fire modes
3.6. Malfunction detection
detects mechanical damage and blocks trigger from causing any more damage
warns user by vibrating (see figure 5.3.)
3.7. Li-Pol/Li-Ion/Li-Fe battery check
when lithium battery is discharged, warns user by vibrating (see figure 5.2.)
setting battery type by trigger
can be switched off for Ni-MH, Ni-Cd batteries
warns user by vibrating (see figure 5.3.)
3.8. Realistic trigger operation
trigger sensitivity can be set during installation to best fit your demands (see figure 5.5.)
3.9. Anti-reversal latch
not needed if your motor is powerful enough (it is recommended to keep it)
solves problem with double shot on semi
3.10. Everything is set inside your gearbox
whole unit is inside your gearbox, replacing trigger contacts
only two power wires comes from gearbox
for easier installation, unit equipped with indication of correct installation
4. Technical parameters
Only high quality silicone wiring is used. 1mm2 in cut and ampacity up to 42A constant.
MOSFET with maximum current up to 202A constant and 808A in peak allows use without any restrictions.
MOSFET is efectively cooled by whole gearbox.
Whole unit is coated by varnish for maximum lifetime even in bad conditions.
Replica´s rate of fire is limited by gearbox components and technical specifications. PSJ unit is able to
make up to 500 000 cycles (shots) per second. Unit is tested on 99 cycles (shots) per second.
Current consumption of unit in stand by mode is 3,9mA.
Dimensions only 22x21x11mm.

5. PSJ-M2 installation
! PSJ-M2 gen.3 should be installed by specialists only !
Advanced knowledge of AEG replicas is crucial. Also basics in electronics and soldering skills are
needed. Never use soldering gun! Manufacturer takes no responsibility for damaged caused by
unprofessional installation!
5.1. Preparation
For PSJ-M2 installation, take gearbox out of your replica, open it and remove all of its content (pict.1).
Pict.1: Gearbox with all of its content removed
5.2. PSJ-M2 mounting
Insert your unit into gearbox, bottom side first (pict.2). If it does not fit properly, you need to adjust gearbox.
Prepare gearbox for smooth unit insertion. After your unit is placed, check for any conductive contacts with
gearbox. If there are any, you need to insulate them! You can sharpen your gearbox or you can use some
insulation material. Bottom side of unit is insulated by pre-installed insulation foil. Before final insertion, remove
protective foil from heat-conducting foil (pict.2). Now you can fix the unit with a screw and organise cables. Never
sharpen the unit.
Pict.2: Installed PSJ-M2 gen.2 with wires placed (wires to forearm)

5.3. Selector plate
Insert prepared selector plate into position of your gearbox (pict.3). Check if the magnet is right above the probe,
when selector is set on semi. If not, adjust magnet on selector plate. If you modify your own selector plate, you
need to remove conductive contacts and remove part of selector plate where it meets cut-off lever. Finally, stick
the magnet on selector, so it is above the probe when selector plate is set on semi (pict.5). For better magnet
placing, we recommend to mill a slot for magnet and insert magnet in. Magnet polarity does not matter.
Pict.3: Maded modifications on selector plate
Pict.4: Represetation sensor of selector plate

Pict.5: Insterted selector plate
5.4. Cut-off lever installation
Place the magnet on your cut-off lever, so in its default position, magnet almost touches the probe (pict.6). It is
enough to use superglue. For correct installation, there is LED indicator on the unit (pict.8). For that to work
connect unit with laboratory power source and insert piston gear. By rotating it, cut-off lever should lift and return
and LED indicator should react by turning off and on again (pict.8 and 9). Is possible to use battery for the test,
but be very careful about battery polarity. If you connect battery incorrectly and cause short circuit, you can
damage the unit.
Test example: connect battery power source to power wires +(red) and –(black), LED indicator will light up for 5s (will make unit
check), then is possible to rotate piston gear and test cut-off lever function. LED indicator will turn on and off when magnet will
be closer or farther from probe.
Importatnt warning: if you press trigger with already installed magnet, you will deactivate test mode and LED indicator will not
react on cut-off lever move. For test mode reactivation you need to disconnect a connect again power source.
Pict.6: Cut-off lever inserted into gearbox (magnet almost touching the probe), magnet polarity doesn’t matter

Pict.7: Tested unit is connected to laboratory power source
Pict.8: Cut-off lever movement, magnet is at the probe = LED lights
Pict.9: Cut-off lever movement, magnet is above probe = LED doesn’t light

5.5. Trigger prepartion
Remove the top part of the trigger, so the top is in the same level (pict.10). Insert trigger into your gearbox and
check if it goes smoothly. If not, adjust your trigger. Set the trigger to position, where you want your replica to
fire and mark the center of the probe. If you wish your trigger to be more sensitive, use rectangular magnet and
place it the way, that it is in contact with probe until trigger is fully pressed (pict.11). If needed, you can very
gently bend the probe to be very close to magnet, but not to touch it.
Pict.10: Trigger adjustment (top) and magnet position
Pict.11: Magnet position on trigger, probe almost touching the magnet
5.6. Replica completion
Assemble the rest of your gearbox in standard way and insert it into your replica. You can now test your PSJ-M2
and set your prefered fire mode.

6. Fire modes and programming
6.1. Preset modes
Selector on semi:
Selector on auto:
1.
Semi
Burst / Auto
2.
Semi
Auto
3.
Semi
Semi
4.
Semi
Burst only
5.
Burst only
Auto
6.
Burst only
Burst / Auto
6.2. Unit programming
a) For programming, connect battery and within 5 seconds press and hold trigger for another 5 seconds.
Entering is confirmed by motor vibrating twice.
b) Next, choose category from menu by pressing trigger as many times as is the number you wish to select.
c) After that, press and hold trigger for 5 second to enter submenu. Your choise is confirmed by motor
vibrating as many times as is selected number.
d) When changing fire mode (menu 3), every trigger press is followed by motor vibrating as many times as is
selected number of fire mode. Submenu goes in cycle, after number 6 follows number 1.
e) When you are done with setting value, press and hold trigger for 5 seconds to save your settings. Double
vibration confirms successful saving and exiting programming function.
Category
(choice confirmed by vibrating in
count of selected number)
Value
(after you select value, confirm it by holding trigger for 5s)
1) Burst setting
Number of trigger presses = number of shots on burst
(default = 3 shots)
2) Battery check setting
1) Li-Pol, Li-Ion (default)
2) Li-Fe
3) Off (recommended for Ni-MH, Ni-CD)
3) Fire mode setting
1) Semi - Burst/Auto (default)
2) Semi - Auto
3) Semi - Semi
4) Semi - Burst only
5) Burst only - Auto
6) Burst only - Burst/Auto
(selection in this submenu is confirmed by vibrating in count of
selected number)
4) Shooting delay setting
Every trigger press = +20ms
(everytime you set delay, you start from default value - for
default value, just hold trigger for 5s)
5) Reset to default values
(returns all settings to their default
values)
Hold trigger for 5s to confirm restart. If you do not wish to
restart your settings, disconnect your battery.
6) Rate of fire setting
each trigger pull = - 10% ( everytime you set, you start from
default value for default value, just hold trigger for 5s) –range
100% - 0%
7) Active brake setting
each trigger pull = -10% ( everytime you set, you start from
default value for default value, just hold trigger for 5s, when
0% is set active brake is turned off) –range 100% - 0%
*Active brake function is to stop motor immediately by residual energy and prevent incomplete cycle before shot.
Gearbox stops straight after shot and minimize inertial move of gears.
With this function replica runs smoother and saves its gearbox. Power of active brake is adjustable and you can
adjust power of braking or turn brake off.

Example of programming: First, I connect battery and press and hold trigger for 5 seconds. Double vibration
sounds. I press trigger 3 times and then press and hold for 5s - I'm entering Fire mode setting. Enter is signalized
by triple vibration. I press trigger, after every press vibrations tell me which mode I'm on. I pressed trigger 5
times, which means I choose number 5 (mode Burst only - Auto). Five vibrations sound, so I press and hold
trigger for 5s. Now double vibration sounds, which means my setting is saved and I exited programming. My
replica is ready with selected setting.
6.3. Motor vibrations meaning
1x vibration: each time you connect battery - states, that unit is ready
2x vibration: entering setting mode, saving and exiting setting mode
3x vibration: malfunction or damage detected
4x vibration: low battery detected
6x vibration: entering manual mode
6.4. Manual mode
If your PSJ indicates damage and you are sure it is not mechanical and your replica is able to shoot, you can
access manual mode. In this mode, malfunction is ignored and you can fire on full auto, regardless of selected fire
mode.
WARNING! By poor judgement, you can cause more damage to your replica and PSJ unit!! This mode is not
recommended for users without advanced knowledge of AEG replicas principles!
To enter manual mode after your replica indicates malfunction, just press and holt trigger for 10 seconds. Entering
is confirmed by 6 vibrations.
7. Troubleshooting
Your PSJ-M2 is not working correctly? Check, where the problem could be:
7.1. Replica not working at all.
Check if the battery is connected and charged properly. Also check that all wires are connected properly to
all elements –motor, battery.
Check fuse funcion, if is connected in replica.
7.2. Replica vibrates when battery is connected, but after that it does nothing.
Problem in trigger setting. Check if your trigger is installed properly –magnet should almost touch the
probe when trigger is pressed. Adjust if needed.
7.3. Selector is on „semi“, but acts like „auto“ is selected.
Bad selector plate installation. Check, that magnet on selector is directly above the probe when selector is
set on semi. Adjust if needed.
7.4. Selector is on „auto“, but acts like „semi“ is selected.
Bad selector plate installation. Check, that magnet on selector is out of sensor when selector is set on
auto. Adjust if needed.
Check if fire selector is poperly moving selector plate, during fire slection.
Check if selector plate is smoothly runnig in gearbox grooves. In some cases it can stammer against
bearings. If this is happenig adjust selector plate or gearbox.
7.5. Replica shoots one or few shots and then vibrates 3 times.
Cut-off lever not working properly. Check if the magnet is close enough to the probe. LED indication will
help you (see pict.5). Adjust if needed.
Check if selector plate spring has enough power. Problem is usually in burst position when selector plate is
farther from cut-off lever and spring has not enough power. Cut-off lever needs to be in basic positon in all
fire modes. Stronger spring is better
Check if cut-off lever is properly installed. Shooting can cause lifting up of cut-off lever and that can couse
that magnet is out of probe.
(Example: gearbox with unit is laying on table and you are looking at it. Cut-off lever can´t move to you
and back.
7.6. Replica not shooting, just vibrates 3 times.
Mechanical malfunction of your replica. Check if motor and gears are not blocked and are working
properly. If you are sure it is ok, you can access manual mode –see figure 5.4.
Check if selector plate is not lifting up cut-off lever and stopping end of cycle. If yes, is necessary to
enlarge space (on selector plate) for cut-off lever.

7.7. Replica vibrates 4 times repeatedly.
Your battery is discharged. Change your battery, do not forget to charge the discharged one. If your
battery is charged properly, your battery setting may be wrong –change it according to figure 5.2.
7.8. If is your installation unsuccessful.
If is your installation unsuccessful, send your unit to our repair centre on followinng address:
Grizzly Airsoft, Zizkova 84/7, 682 01 Vyskov, Czech Republic
8. Package content
•processor unit PSJ-M2
•complete silicone wiring of your choice
•pre-installed insulation foil
•pre-installed heat conducting foil
•two different magnets for trigger, one for cut-off lever
•modified selector plate with magnet
•Dean-T plug –male
•gold-plated motor plugs - 2pcs
•gold-plated fuse plugs –2pcs
•mini fuse –30A
•heat schrink tubings
•user and instalation manual
WARNING: PSJ-M2 should be installed by qualified AEG professionals only. Manufacturer is not liable for any
damage on the gun caused by unprofessional installation. Do not use soldering gun!
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