===== The electronic board and its parts =====

The electronics PCB is the main section of the baton. There are several different versions. These can be divided into two main catagorys. The small board with wires and the larger board with led integrated. Functionality is very similar except you cannot replace a large board unit with a small board but you can use the large board unit in most casings.

=== Epoxy ===
Some older boards were encased in epoxy. If this is the case it is very difficult and costly to do board level repairs under the epoxy. The procedure to repair a fault under the epoxy requires you to take a small saw and carefully remove the epoxy before following normal procedures to carry out the repair. Bigger boards encased in epoxy can get a fault where the heavy epoxy lifts from the board due to multiple concussions. This normally also lifts electronics from the board at the same time.\\
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=== Jumper pins and switches ===
Some boards have jumper pins or switches to manage the power. If the unit has a switch or jumper it is recommended to replace it with a wire. Jumper units might already be damaged if the jumper was soldered together. This might require you to solder a wire to an extra place on the board as shown in the picture.

=== Resistors and inductors on the board ===
The values and part numbers indicated below are for the 2010-2013 boards. This might be different for other boards. Any of these components can have an intermittent fault or a permanent fault if the board is twisted. Twisting the board sometime results in excessive stresses in the components and they lift. excessive heat and cold can also cause this.None of these components have a specific orientation and can be ploaced any way around.

== R2 ==
R2 is a 1k resistor used to protect the board from high voltage.

== R4 ==
R4 is a 1k resistor used to supply current to the led. 
== R6 == 
R6 is a 100R sacrificial component which will be blown to protect the board from prolonged high voltage.
== Inductor ==
The inductor is also a protection component.

=== Unit drawing too much current ===
The unit should not draw more than 5uA. There can be several reason for this fault.
  * Water can corrode the board and leave trace salts on the board which would cause current drain. Cleaning the board with meths or alcohol should solve it
  * Electrocuted units can have a damaged capacitor which would draw extra current. Capacitors are in 10nF and 100nF values all should be replaced in this case.
  * Electrocuted units can also have one of the protection diodes damaged. The damaged diode would have to be replaced.
  * Old firmware can cause extra current drain, this would need to be upgraded to repair.

=== Clock chip and crystal ===
The clock chip and crystal are used to keep accurate time on the device. The crystal can be damaged by excessive force which normally results in a clock stopped condition. The clock chip can also be damaged by board twisting or electrocution.

=== Data chip ===
The data chip is used to store all data clocked in the system. The data pointer for where data is stored in memory is kept in the microprocessors. If the unit is electrocuted this can result in an undertumined data pointer which results in corrupt data.

=== LED ===
The LED is used to indicate a proper point clocked. This can be physically damaged or electrocuted. This does need to be placed the correct way around when replaced.

=== PCB Track damage ===
When physical damage is involved, tracks can be removed or damaged. This can be replaced by wire if the copper is cleaned from the ends of the tracks and the wire soldered to it.

=== Different PCB's ===
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Back of MT2007A\\

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Front of MT2007A\\

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Long Epoxy board\\
Red is batter +\\
Black is battery -\\
Blue is LED -\\
White is LED+\\
Orange is Touch port\\

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Back of MT2009\\

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Front of MT2009\\

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Back of MT2010-04\\

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Front of MT2010-04\\

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MT2010 RED version\\

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MT20 board\\

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Short epoxy board\\
Pins from top left\\
|LED-| LED+|TP-|TP+|
|Batt-|Batt+| | |

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