TENNISPRO CB-20 User manual

CB-20 STRINGING MACHINE
INTRODUCTION
TENNISPRO DISTRIBUTION makes your life easier. You just obtained the
CB-20 stringing machine in order to string tennis, squash and badminton
racquets.
However, we advise you to carefully read this guide before stringing your
first racquet. This guide will provide you with all of the necessary
information regarding your machine, how it functions and the correct way
to string. This information will help you learn how to quickly string all types
of racquets.

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Table of contents
I. THE STRINGING MACHINE : COMPOSITION.............................................................. 3
A. The Stringing Machine.................................................................................................. 3
B. The tools.......................................................................................................................... 4
C. The tension system....................................................................................................... 4
D. Putting the Machine Together ..................................................................................... 4
II. RACQUET AND STRING PREPARATION...................................................................... 5
A. Putting the racquet on the machine............................................................................ 5
B. Advice before beginning............................................................................................... 8
C. Preparing The String..................................................................................................... 8
III. HOW THE STRINGING MACHINE WORKS.............................................................. 10
A. Selecting tension ......................................................................................................... 10
B. The clamps................................................................................................................... 10
IV. HOW THE CONTROL PANEL WORKS...................................................................... 11
A. The screen.................................................................................................................... 11
B. Selecting tension ......................................................................................................... 11
C. The different functions................................................................................................ 12
D. Calibration..................................................................................................................... 14
E. Troubleshooting........................................................................................................... 16
V. STRINGING THE RACQUET........................................................................................... 17
A. Two knot method......................................................................................................... 17
A.1. The mains..........................................................................................................17
A.2. The crosses.......................................................................................................17
B. Stringing with 4 knots.................................................................................................. 18
B.1. The mains..........................................................................................................18
B.2. The crosses.......................................................................................................18
C. Doing a knot ................................................................................................................. 19
C.1. Tying off knots...................................................................................................19
C.2. What to do if the string is too short to reach the mecanism to tighten the
string ? 20

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I. THE STRINGING MACHINE : COMPOSITION
A. The Stringing Machine
Tool storage
compartment
Control panel
Tension mecanism
Rotating
plate
Vertical
tightening
wheels
Clamps
Lateral
tightening
wheels

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B. The tools
On top of your stringing machine, you will receive all of the necessary tools to begin
stringing:
•Starting clamp
•Multi-use clamp
•One pair of cutting pliers
•Awl
•Allen keys
•Two flying clamps for badminton
•4 adaptors for badminton
C. The tension system
On this CB-20 stringing machine, there isa controlled electronic tensionmecanism thanks
to the control panel (control panel functionalities in part IV).
This tension system has been optimised to save you time . This system avoids wasting
your time by obligating you to press a button. This is why the Touch Pad has been added
right next to the mecanism you use to tighten the string. This will increase fluidity.
D. Putting the Machine Together
To simplify putting the CB-20 stringing machine together, you will find the following link
that explains the provided parts of the machine, along with the steps for putting the
machine together.
Discover our stringing manual for the CB-20 stringing machine
Touch Pad

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II. RACQUET AND STRING PREPARATION
A. Putting the racquet on the machine
To correctly place your racquet on the machine, make sure the two pillars are found in
the interior of the racquet frame as shown in the photo below :
Next, tighten the two central pillars with the spanner adjuster in order to ensure that the
racquet's frame does not move (shown below) :

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Lastly, tighten the lateral arms in order to completely block your racquet :
Below you will find a photo of the two spanner adjusters :
Tightening wheel for
the lateral arms
Tightening wheel for
the pillars

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Position the pillars based on the number of grommet holes :
Attention : make sure the butt cap (logo) of the racquet is right side up when you are
putting the racquet on the machine.
Position of
the screw
when there
are 4
passages
Position of
the screw
when there
are 3
passages

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B. Advice before beginning
First of all, you need to study the present document in the B section to learn the
terminology for the strings and holes. Almost all modern racquets do not have a left
and right side. However, certain models offer a « Short Side ». This is the side where
you must do your knot for the mains when you are stringing with the « two knot »
method. For the « four knot » method, you need to tie off your superior knot on the
Short Side.
→This is the right side when the racquet is correctly placed on the stringing machine
(see putting the racquet on the machine).
Once you have started stringing, do not remove the frame from the vice, unless you
have :
•Finished stringing
•Released the tension for all of the strings that are already tightened.
Failing to take this precaution into consideration could lead to racquet deformation.
C. Preparing The String
To know whether you need to start stringing the racquet from the top or bottom, count
the number of string passages there are at the throat of the racquet :
•If your racquet has 3 passages, start stringing at the throat area (bottom of
racquet frame).

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•If your racquet contains 4 string passages, you can start at the top of the
racquet.
Starting to string at the throat or the top of the racquet does not have any impact on
the following methodology.
String can come in two forms (packages) :
•A string pack of 12 metres
•A string reel. In this case, you need to measure and cut 12 metres in order to string
your racquet.

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III. HOW THE STRINGING MACHINE WORKS
A. Selecting tension
On the CB-20, the Touch Pad has been added to improve your stringing flow. The Touch
Pad is touch-sensitive to enhance your stringing speed.
The maximum amount of traction/tightening time (constant) is 60 seconds. If a string is
pulled for more than 30 seconds, the following screen is displayed for a brief moment (if
the sound is activated, you will hear a buzzer). Then, a 30 second countdown will begin.
If the timer reaches 0, the motor will turn off and the tension currently applied to the string
will be lost.
B. The clamps
The provided clamps are made of brushed aluminium. These clamps can be adjusted (in
terms of tightening) to adapt to your string's gauge. The blocking system is enhanced to
allow you to save more time. When you liberate the clamp, the base will be liberated as
well.

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IV. HOW THE CONTROL PANEL WORKS
A. The screen
The CB-20 control screen is a LCD screen. There are two different screens :
The settings screen : This screen is displayed for 3,5 seconds right after you tighten a
string with the machine.
To display the settings screen, push F1 whenever you want. If there is no modification
performed after 10 seconds, the primary screen will be shown once again.
The primary screen : On this screen, you will find :
−The tension for the mains and the tension for the crosses
−The choice of tension in kg or lbs.
On the example below, the crosses are chosen to be at a tension of 29,6kg and the mains
(when you select them) will be at a tension of 28,3 kg. You have access to all settings
thanks to the buttons on the side (knots, pre-stretch, etc.).
B. Selecting tension
When you are on the primary screen, you will have the possibility of modifying the string's
tension :

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•F2 will allow you to increase the number by tens
•F6 will allow you to decrease the number by tens
•F3 will allow you to increase the number by one
•F7 will allow you to decrease the number by one
•F4 will allow you to increase the number by a tenth
•F8 will allow you to decrease the number by a tenth
C. The different functions
Knot : if you push this button, the knot amount will be displayed and the
light will be switched on.
To select a different knot amount, push the knot button once again until (after 3,5
seconds) the knot amount is highlighted and flashing. Push F2, F3 or F4 to increase the
amount of knots and push F6, F7 or F8 to decrease the amount of knots. Push ENTER
to save the knot amount. The activated knot adjustment only works when you are pulling
a string. Knot tension available from +0% to +30%.
Sound : Pushthe sound button to activate or deactivate the audible warning.
If the sound is deactivated, no sound will be heard from the machine's program. The
sound can be useful in two different cases :
-When you tighten a string, the sound indicates the desired tension has been reached
-If the string is tightened for more than 30 seconds
Speed : Push the speed button to display the speed icon on the screen. This
icon will remain visible for 3,5 seconds. If you would like to modify the speed, push the
speed button once again and hold until (3,5 seconds) the speed value is displayed and
flashes. Next, push F2, F3 or F4 to increase the speed value and push the F6, F7 or F8
buttons to decrease the speed value. Push ENTER to save the speed value. Push ESC

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or wait 5 seconds and the speed icon will disappear. The available speeds are : 100% →
90% →80% →70% →60% →50% →40% →30%.
Mains/Crosses : This button will highlight the tension for the mains and
crosses. If the mains are chosen, a different value for the crosses tension (other than the
mains tension) can be chosen. Push F2, F3 or F4 to increase the tension value for the
crosses and F6, F7 or F8 to decrease the crosses tension within the current memory.
Once you have selected a different tension for the crosses, the tension will be displayed
in the larger numbers (31.0 kg in the example below). Meanwhile, the original mains
tension (29.6 in the below example) will be displayed in a smaller number over the mains
icon.
LBS-KG : At any time, you can modify the displayed tension from kg to lbs
(or vice-versa). You can even do this during calibration. The latest choice will be
automatically memorised.
Pre-stretch : Push this button to display the adjustment icon. If this setting
is defined, the icon will be displayed after 3 ,5 seconds. If the pre-stretch needs to be
modified, push the pre-stretch button again and keep pushing (3,5 seconds) until the
pre-stretch value is displayed and is flashing. Push F2, F3 or F4 to increase the value
and push the F6, F7 or F8 buttons to decrease the value. Press ENTER to save the
defined percentage within the current memory program.
If the pre-stretch function is saved following your modification, an icon will appear on
the primary screen.
Possible pre-stretch varies between 0% and 30%.
SLM (string length measurer) : This option will allow you to measure your
tennis,badminton or squash string.
If the string's tension is at 35 lb (15,9 kg) or more, the SLM will calculate the tennis
string's length (based on a diameter of 1,25mm). If the string's tension is at 34,9 LBS
(15,8 kg) or less, the SLM will calculate the badminton string's length (based on a
diameter of 0,75mm). Apply a breaking force to the badminton string that is entering

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the SLM to prevent the string from slipping and to obtain an accurate measurement.
Push the LBS/KG button to select a measurement in feet or metres. Press ESC or the
arrow key button to leave the SLM mode.
Memory : The memory program saves up to 10 different personal stringing
choices/combinations. Push the M button to conjure the memory icon for 3,5 seconds.
If within these 3,5 seconds, you press the same button once again, you will find the
following memory : M1 →M2 →M3 →M4 →M5 →M6 →M7 →M8 →M9 →M1,
etc. Each memory is modifiable regarding all string characteristics (pre-stretch, knot,
tension, string speed...).
Push F5 (the light found next to F5 will be switched on) to reverse the
memory direction, going by the M9 →M8 →M7, etc. order. Press F5 once again to
turn off the light and return to the regular order.
« M0 » : Press the M button for more than 5 seconds until the light on
the side of the button is switched on.
M0 is a special fluctuating memory function. All stringing combinations can be
adjusted, but after restarting the machine (with or without tension), all of the
adjustments can be erased and M0 captures the original adjustments. To leave this
mode, press the M button for more than 5 seconds.
Press F1 for more than 5 seconds to display the informational screen below :
- Display the program's version number
- Display the total number of tightened strings
- Press ESC or the arrow key button to leave this screen.
D. Calibration
Note that calibration can only be done electronically via the control panel.

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To access the calibration screen, press the ESC and ENTER buttons when you are
switching the machine on.
1. The screen will display 10 kg or 22 lbs.
→KG / LBS can be modified at any time without making any difference
2. Pull the string and adjust the tension amount based on the tensiometre function.
Then, press the Enter button to confirm. Next, to release the string, press the
tension button.
3. After returning to the stop position on the extraction clamp, the screen will display
20 kg or 44 lbs.
4. Pull the string and adjust the tension amount based on the tensiometre function.
Then, press the Enter button to confirm. Next, to release the string, press the
tension button.
5. After returning to the stop position on the extraction clamp, the screen will display
30 kg or 66 lbs
6. Pull the string and adjust the tension amount based on the tensiometre function.
Then, press the Enter button to confirm. Next, to release the string, press the
tension button.
7. After returning to the stop position on the extraction clamp, the screen will display
40 kg or 88 lbs
8. Pull the string and adjust the tension amount based on the tensiometre function.
Then, press the Enter button to confirm. Next, to release the string, press the
tension button.
9. Calibration is finished. Restart the machine by powering down and powering up.
Attention : If you press ESC at any time during calibration, no new calibration data will
be saved (The ESC button only works if the string is not under tension).

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E. Troubleshooting
Error codes can be displayed in certain situations. You will find the different possibilities
below :
•C01 –if the extractor does not reach the end position on the right side 6 seconds
after the machine is put under tension
•C02 –a string isdetected in theextraction head when the machine isunder tension
•C03 –the initial tension of the force sensor is too high
•C04 –Motor current is too significant/strong
•C05 –power switches at the end position on the left and right sides are active
•C06 –sudden collapse of the weighing cell signal (when the machine pulls a string
and the string slides in the clamp's teeth or within the extractor)
•C07 –motor overcurrent (happens when the string is in the extractor when
powering up ; or if the end position is not functionning).

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V. STRINGING THE RACQUET
A. Two knot method
A.1. The mains
Based on the present photos in part II.D and based on the model of your racquet, you
will begin stringing one side (the chosen side is not important EXCEPT for racquets
with a « Short Side »). This string length is determined by the following calculation :
(Number of mains/2)+1
For instance, for a racquet with 16 mains (16/2)+1=9
You will then measure 9 lengths of a main string, permitting you to have enough string
for the 8 mains on one side of the racquet and +1 extra main length to tie off the racquet
with a knot.
Once this has been done, you can begin stringing the mains. Block the string on one
side in order to not lose tension while you are stringing the other side. String your first
main as previously explained, then block the string with your second clamp.
Put your string in the next grommet (hole) and repeat the above procedure.
Once you have finished the side with your 9 lengths measured, you can tie them off
with a knot (explained in part C below).
Attention :
•Do not string one entire side at once as you will risk damaging your racquet.
Do 3 or 4 on each side until you finish the mains.
•Certain racquets have mains where you will need to skip a string (primarily
between the sixth and seventh holes and the seventh and eigth holes). Verfiy
before you begin stringing.
A.2. The crosses
Pour corder les travers de votre raquette avec la méthode deux nœuds, voici comment
procéder :
•After doing your knot with the shorter amount of string, the second amount must
be another 6 metres (roughly) to enable you to string the crosses. If the last string
finishes on the top, you will put the string through the first available cross hole.
•After this, you will put the string under the first main string, then over the second
main string, then under... until you arrive at the same hole positioned on the other
side of the racquet (starting by putting the string over or under the first main does
not change anything ; it is your choice).
•Put the string under tension, then clamp the string as close to the grommet as
possible to maintain the applied tension.
•Continue by putting the string through the next available hole in order to do your
second cross.

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Attention : the crosses must be done in staggered rows. This means if you put the
string OVER the main for the cross 1, your cross 2 must go UNDER the same
main !
•Continue stringing the crosses of your racquet until the last cross string by putting
each string under tension and clamping each tightened string.
•After your last cross, you can do your final knot (see part C below).
B. Stringing with 4 knots
To string with four knots, cut your string into two parts in order to have two pieces of 6
metres : one will be used for the mains and the other for the crosses.
B.1. The mains
La réalisation des montants pour corder en quatre nœuds est la même que pour la
méthode en deux nœuds en dehors de trois exceptions :
•If your racquet possesses a « Short Side », it is not necessary to take this
information into account for the mains.
•It is not necessary to calculate the length of the mains. You can simply split the
12 metre string in half, obtaining two 6 metre pieces.
•A knot is to be completed on each side once the mains are completed (see
part C below).
B.2. The crosses
To complete your crosses with 4 knots, the same procedure for the 2 knots method is to
be followed, except there is one exception :
•Your crosses will be completed with a second piece of 6 metres. You can directly
string your cross and leave extra string on one side in order to tighten it later
(prepare enough string to be able to tighten it with the tension mecanism). Next,
this string should be blocked thanks to the departing clamp (not included
with the CB3 stringing machine) until you finish all of your crosses. Here
are the references on the Tennispro.eu website : T014 and 800.
Once your knot is tied on the bottom, you can tighten the first cross and tie off
your last knot.
Attention : if your racquet possesses a « Short Side », you need to respect this
information and put the extra piece of string on the right side.

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C. Doing a knot
C.1. Tying off knots
Once you have completed your mains and crosses, you need to tie off a knot in order to
maintain the tension on your strings. For this :
•If no error has been made on your racquet, you need to find a hole that is wider
than the other closer holes after tightening your last string. This needs to be done
in order to be able to tie the last string off with a knot.
•Put your string through the wider hole
•Put the string in an interstice on one side or the other
•Raise the string on the other side of the same string and put it in a formed loop.
•Delicately, but firmly tighten the knot and repeat this same procedure in order to
do a second knot.
•Cut the excess string
•Release the clamp
Remark : For the majority of modern racquets, the holes do not contain two strings,
except for the ones in which you use to do knots.
However, on certain racquet heads, two strings can be put in the same hole. If it is difficult
to put a string in a hole that already has a string in it, here is how you can proceed :
•Make the end of the string sharper or like a needle by using cutting pliers.
Bigger
holes to
allow you
to do knots

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•Put the sharper string in the hole with the help of the multi-use pliers.
•Use the string guider (provided with the machine).
C.2. What to do if the string is too short to reach the mecanism to tighten
the string ?
If the last string is too short and it is not possible to use the tension system on the stringing
machine, there are two possible solutions :
•Use the bossage clamp (not provided with the CB-20 machine. See the reference
808 as it will allow you to manually tighten the string up to 35kg/77lbs.
•Use the starting clamp (provided with the CB-20 machine.), which connects and
can be used to « lengthen » the string when it is too short to reach the tension
mecanism.
If you have any problem or question regarding your stringing
machine, contact our Return of Goods Service at the following
address :
TENNISPRO DISTRIBUTION
11 Rue des Cigognes, CS 40138
67960 ENTZHEIM CEDEX FRANCE
Phone. : [phone]
E-Mail : [email protected]