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circuit Diagram
equipment plan
connection / commissioning
Once the PCB has been equipped and examined for possible errors (bad soldering points, solder bridges),
a first function test can be performed.
attention!
The servo tester must only be operated with batteries or rechargeable batteries with a voltage
of 4.8 - 6 V. If this is not observed, not only the servo tester, but also any connected servos may
be damaged.
Connect a servo (or speed controller) to the corresponding pin strip. Observe correct polarity of the plug,
see label on the PCB.
The usual colours of the servo cables are:
Yellow/white/orange cable:
Control signal
Red cable:
Operating voltage
Brown/black cable:
GND/Minus
Connect the operating voltage to the 2-pin pin strip. It may have between 4.8 - 6 V/DC (direct voltage).
Observe the polarity and the symbols on the PCB. The red cable of the battery must be plugged
into the plus pole („+"), the black cable into the minus pole („-"). If this is not observed, the servo
tester and the connected servo/speed controller will be destroyed. Loss of guarantee/warranty!
No liability for consequential damage!
important!
Many speed controllers have a BEC (a receiver current supply integrated into the speed cont-
roller). In this case, no battery or receiver battery must be used for operation of the servo tester!
The servo tester is powered directly via the speed controller by the drive battery. If a separate
power supply is to be used for the servo tester instead of the integrated BEC, the middle, red,
wire of the three-pole receiver plug of the speed controller must be interrupted. If this is not ob-
served, the speed controller and/or servo tester will be destroyed! Loss of guarantee/warranty!
Turning the potentiometer P1 must cause the servo to work as if it were connected to the receiver and as if
you were then giving a corresponding control command at the remote control.
If everything is okay so far, skip the following error check list. If the servo does not work or if there is any
other malfunction, disconnect the servo tester from the operating voltage and recheck the complete PCB
according to the following check list.
check List for troubleshooting
• Has the operating voltage been connected to the right pin strips?
• Has the operating voltage been connected with the correct polarity?
• Is the operating voltage between 4.8 and 6 Volt?
• Is the servo connected in the correct polarity?
• Are the resistors with the correct values soldered in?
• Is the electrolyte capacitator installed in the correct polarity? Compare the polarity indication printed on
the electrolyte capacitator to the equipment print on the PCB or the equipment plan. Observe that „+" or „-"
may be marked on the component depending on electrolyte capacitator make!
• Has the IC1 been inserted into the holder in the correct polarity? Groove or dot of the IC1 must point
towards P1.
• Are all IC legs in the holder?
• Is there a solder bridge or short circuit on the soldering side? Connect the conductor connections that may
look like undesired solder bridges to the conductor chart of the equipment print and the circuit diagram
before interrupting a conductor (alleged solder bridge)! Hold the PCB against bright light to find conductor
connections or interruptions more easily.
• Is there a cold solder point? Check each solder point thoroughly! User tweezers to check if components
are wobbling. If any solder point seems suspicious, resolder it to be sure.
• Check if every solder point has been soldered. Solder points are often missed.
• Remember that a PCB soldered with soldering fluid, solder paste or similar flux agents or with unsuitable
solder cannot work. These substances are conductive, thus causing creepage current and short circuits.
practical advice
• We recommend installing the servo tester in a suitable housing. Ideally, the housing should be chosen at
a size that provides enough space for a matching battery (or battery holder) to operate the servo tester.
• The manufacturers of remote control systems use some different impulse lengths that are measured in
milliseconds („ms") for the neutral position and the end deflections of servos. Common values for this are
1.5 ms for servo centre, 1 ms for full deflection left and 2 ms for full deflection right.
The servo tester covers the common impulse length range of different manufacturers and can even ge-
nerate smaller (0.8 ms) or larger (2.2 ms) impulse lengths. Therefore, we recommend that you adjust
your servo tester for your remote control. For this, test the neutral positions and end deflections (without
trimming or other path adjustments) of your remote control and apply these values to a suitable scale at
the servo tester housing. This makes it possible to check or adjust the servo settings and deflections with
the servo tester without taking your remote control into operation.
• Ensure that the rudder linkages are running easily when testing servos and do not block at full deflection.
This warranty maximum control deflections with high return accuracy.
Disposal
Dispose of the product according to the applicable statutory provisions at the end of its service
life.
technical Data
Operating voltage ..........................................4.8 - 6 V/DC
Impulse width .................................................0.8 to 2.2 ms
Dimensions (L x W) .......................................54 x 34 mm
These operating instructions are a publication by Conrad Electronic SE, Klaus-Conrad-Str. 1, D-92240
Hirschau (www.conrad.com).
All rights including translation reserved. Reproduction by any method, e.g. photocopy, microfilming,
or the capture in electronic data processing systems require the prior written approval by the editor.
Reprinting, also in part, is prohibited.
These operating instructions represent the technical status at the time of printing. Changes in techno-
logy and equipment reserved.
© copyright 2013 by conrad electronic se.
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