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( Operating instructiOns
servo tester
item no. 23 49 15
intended use
The product serves functional inspection of model car servos/speed controllers. Before commissioning, the
construction kit has to be set up completely. This requires soldering skills.
Any use other than that described above can damage the product and may involve additional risks such as
short circuit, fire, electric shock, etc. The safety information must be observed at all times.
This product complies with the statutory national and European requirements. All company names and pro-
duct names are trademarks of their respective owners. All rights reserved.
scope of Delivery
• Construction set
• Operating instructions
safety information
the guarantee/warranty will expire if damage is incurred resulting from non-compliance
with the operating instructions! We do not assume any liability for consequential dama-
ge!
We do not assume any liability for property damage and personal injury caused by im-
proper use or non-compliance with the safety instructions! in such cases the guarantee/
warranty will expire!
• Unauthorized conversion and/or modification of the product are not permissible for safety and
approval reasons (CE).
• This product is not a toy and not suitable for children.
• The servo tester must not get damp or wet.
• Always use a battery or rechargeable battery pack to operate the servo tester. Never use a
wall mains adapter. Disconnect the battery from the servo tester when you are not using it.
• To avoid short circuits and their consequences, the servo tester must be installed in a suitable
housing.
• Only set up the construction kit if you have enough knowledge for the corresponding soldering
work. Use a suitable electronics soldering gun (no soldering tip, max. heating output 50 W) for
setup.
Improperly set up construction kits are not covered by the warranty/guarantee.
circuit Description
The servo tester can be used to imitate the output impulses of the receiver of a model construction remote
control. Connecting the servo tester to a servo, speed controller or sail winch will permit setting and moving
the respective connected device as if it were getting the usual control commands from the remote control
system.
A servo tester is helpful if, e.g., a remote control no longer works properly. In this case, you can check if there
is a defect in the system or if the servo is defective. Additionally, the servo tester can also be used for setting,
testing and adjusting rudder linkages and speed controllers, since you will not need to take the entire remote
control system into operation each time.
The main part of the circuit is the IC „CD 4001", which is switched as an instable multi-vibrator. Positive
impulses are pending at the output of the IC (Pin 3) with a period duration of approx. 18 ms and an impulse
width of 0.8 - 2.2 ms. Negative impulses are available at pin 4.
The impulse width is set with a rotating potentiometer P1. Reconciliation of the circuit is not required, since
the impulse width and period duration are determined by the components.
Note that each remote control system works with a different impulse width. If you have tested the servo of one
make and now want to test function of another make, the neutral position of different devices may not match.
This is not due to the servo tester, however, but due to the electronics in the servos/speed controllers.
The servo tester supplies impulses that make the servo do a 90° movement with the capacitators and resis-
tors in the construction kit. Increasing the capacity of the capacitator C3 from 33 nF to 47 nF while changing
the resistance value R3 from 18 kW to 15 kW enlarges the rotating area from 90° to 180°. Matching parts for
this are not part of the delivery but need to be ordered separately.
A 4 - 5-cell receiver battery or 4 x 1.5 V Mignon cells are best for power supply (installed in a battery holder).
The servo tester must be installed in a matching housing (into which the batteries may fit as well) after
completion.
general notes on setting up the construction Kit
For the servo tester to work after assembly, you have to perform setup conscientiously and carefully.
Check each step and each soldering point twice before installing the next part! Stick with the described
construction section. Do not skip any construction sections! Check every item doubly: Once for building,
once for checking.
Take your time. Setting up a construction kit is not a competition. The time spent here is thrice less than that
spent troubleshooting.
A frequent cause of non-function is an equipment mistake, e.g. components such as ICs, diodes and elect-
rolyte capacitators being installed the wrong way around. Also always observe the coloured rings of the
resistors, since some of them can easily be mistaken for others. If you cannot recognise the colour rings
clearly, measure the resistors with a suitable meter.
Observe the correct capacitator values as well (e.g. n 10 = 100 pF, not 10 nF).
Also observe that all IC legs are actually pushed into the holder. An IC leg can easily bend when being
pushed in. If you push a little, the IC needs to jump into the holder almost of its own accord. If it doesn't, a
leg is very lightly bent.
If everything is okay when equipping the PCB, check the PCB for cold soldering points. They occur when a
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soldering point has not been heated properly so that the solder does not have proper contact with the lines,
or when the connection has been moved during cooling just when the solder stiffened. Such errors can
usually be recognised by the matte looks of the soldering point's surface. The only remedy is to properly
resolder the soldering point.
Version 10/13
7
setting up the construction Kit
a) resistors
First, the angled resistors are pushed into the corresponding bores (acc. to equipment plan). Then bend the
wires of the resistors apart by approx. 45° so that they cannot fall out when the PCB is turned around. Solder
the resistors to the conductors carefully on the reverse.
R1 = 1 MW
R2 = 82 kW
R3 = 18 kW
b) capacitators
Push the capacitators into the correspondingly marked bores, bend the wires slightly apart and solder them
cleanly to the conductors.
Observe polarity (+/-) of the electrolyte capacitator C1 (tantalum capacitator). Depending on make, it has
different polarity marks.
C1 = electrolyte capacitator
C2 = capacitator
C3 = capacitator
c) ic-Fitting
Next, push the 14-pin IC-fitting for the integrated circuit into the corresponding posi-
tion (IC1) on the PCB.
To prevent falling out of the fitting, bend two diagonal pins of the fitting. Then all pins can be soldered. Make
sure not to use too much solder. This will lead to short circuit between two pins.
d) trimming potentiometer
In this work step, the trimming potentiometer is pushed into the circuit and soldered to
the PCB on the back.
P1 = 100 kW
e) pin strips
Now the pin strips are soldered into the circuit (input and output). For this, the 5-pin strip is separated so that
a 2-pin and a 3-pin pin strip result. They are soldered in in the corresponding positions.
f) integrated circuit (ic)
Last, the integrated circuit IC1 (= CD 4001 or MC 14001) is carefully inserted into the intended fitting.
g) positive or negative impulse
In addition to the 3-pin pin strip for the servo connection, the PCB has 3 sol-
der contacts for selection of the function mode; see figure on the right. Solder
in a small wire bridge here; use, e.g., the cut-off wire of a resistor.
„P" = Positive impulse:
„N" = Negative impulse:
h) Final inspection
Check the circuit again before commissioning to ensure that all components have been inserted correctly.
Observe correct polarity in various components!
Check on the soldering side of the PCB whether solder residue bridges any conductors, which may cause
short-circuit and destruction of components. Also check if cut wire ends are touching the PCB. This may also
cause short circuits. Most construction kits returned with a complaint are due to bad soldering (cold soldering
points, wrong solder, etc.) and incorrectly installed components.
Also observe that construction kits soldered with acid-containing solder, solder paste or similar are not re-
paired or replaced.
brown / black / green
grey / red / orange
brown / grey / orange
10 µF
0.1 µF = 100 nF
0.033 µF = 33 nF
attention!
Observe a groove or other mark of the fitting. This is the mark for ICs
(connection pin 1).
attention!
Integrated circuits are sensitive to incorrect polarity! Therefore, observe the corresponding mark
of the ICs (groove or dot). The IC1 is a particularly sensitive CMOS-IC that can be destroyed
by static charge. The IC1 therefore should only be touched by the housing without touching the
connections. Integrated circuits generally must not be replaced or pushed into the fitting with the
operating voltage pending. This would destroy them.
Bridge between middle contact and contact „P"
Bridge between middle contact and contact „N"
Most servos need a positive impulse.
If you find in later operation than the servo path is very short or that the servo does not react
properly, try switching function mode.
C1
C2/C3
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