A. iron (commonly known as: spicy chicken)
Specifically responsible for soldering electronic components such as the purchase of 30-35W soldering iron will be enough. Wattage (W) the higher the temperature the greater the representative of iron.
Usually 30-35W soldering iron tip temperature of about 300 C. After the opening tip to wait about 5 minutes, only enough to tip temperature.

B. iron frame
Place the iron metal frame, has been with the sponge tip cleaner, when used to water on the sponge. Soldering iron warm up, please used in the welding
Before the tip on the sponge to clean it.

C. Solder Wire
Tin content to buy 60% or more of high-quality tin wire (the other 40% of lead and other impurities), the general line of the melting point of tin of about 180 C or so.
In general use, you should buy diameter 0.5mm - 0.8mm tin line.
High-quality line made out of tin solder joints will be reflective shiny; poor dull light.

D. welding knowledge
1 Not all metals are welded tin can. General electronic components of the "feet" are made of iron or copper, the surface is coated with a layer of nickel, to prevent
Oxidation (some senior will silver, even gold-plated), the above can be tin metal are Welding Electrodes, only it takes a special processed aluminum
To use tin soldering.
2. The principle is to be welded weld metal need to be heated to over 180 degrees (the melting point of tin line), the point on the tin line, it immediately dissolves into the liquid tin
Completely attached to the welded metal surface.
3, such as welded metal temperature high enough, it becomes semi-liquid tin semi-solid form, it can not be completely attached to the welded material, the formation of "false welding" "Weld" situation.
4 Therefore, the main cause is poor welding: welded metal wire temperature below the melting point of tin (180 degrees).

E. actual welding
1 First check the bottom of the solder joints and parts "feet" have no oxidation or stains, clean look if please. Backplane available eraser (mastic) clean;
Small Knife feet away parts available stains.
2 Insert the parts, spare parts to flat floor, try not to have the extra legs exposed.
3 Reverse floor see parts feet. (Parts may fall out, it is usually short of the first welding part (such as resistance), because it could be pressed
Table, will not fall out.)
4. Right hand soldering iron, solder wire with his left hand on the welding point.
Iron floor nozzle must have contact with the foot joints and parts, which aims to both heated to over 180 degrees is estimated that no two seconds, two
Temperature reached 180 degrees, tin line would be immediately dissolved into a liquid, completely surrounded by solder joints.
5 tin much or as little rule of thumb. Too easy to form bead-like; too little solder is not strong. Was the most perfect is the "pyramid" shape,
The figure shows that melting tin solder is wrapped round and round and parts of the foot, and pyramid.
Finally, the extra foot cut, welded.
6. Weld time must be completed within 5 seconds, because all the electronic components are very sensitive to heat, particularly transistors, diodes, etc. at any time due to
Overheated and damaged, be sure to pay attention.
7, such as welding of larger metal objects, may be heated more than 5 seconds or more, then can replace the larger wattage soldering iron, such as 60W to
100W, as used in the soldering 5 seconds to complete the action.

F. welding wire in the end plate techniques
1 wire and solder joints were first on the tin. (Very important step, if not the first, respectively, on the tin, they are not easy to weld together the)
(2) that the two welded together, without the period plus tin.

Summary of test machine:
One. Finished welding after connecting the power before to spare the following:
a. Carefully check that no wrong connection parts.
1 resistance: in particular, are easy to mistake, for example, 100Ω (dark brown brown), easy and 10KΩ (dark brown orange) or 100KΩ (dark brown yellow)
Confusion, please check carefully the clear.
2 capacitors: relatively simple, in part because of the value printed on, but to pay attention to the positive and negative electrolyte capacitor, such as the wrong tone is negative, the circuit still
Can work, but very easy to damage the capacitor 3. Diode: pay attention to polarity, the result is the wrong tone circuit is not working, and even burning parts.
4 transistor: pay attention to polarity, the result is the wrong tone circuit is not working, and even burning parts.
5. Zener diodes: 1N4148 diode appearance with close careful to see the text printed on the tube, and pay attention to polarity. 6 LEDs: dysregulated polarity, LED does not light, but not damaged.
7 infrared receiver diode: if the wrong tone polarity, there may soon burn.
8 Power: Very important, never pick the wrong polarity, wrong tone consequences may burn parts 9. Choke: CK-101 within a choke, short legs to be inserted on the floor marked the position , the circuit does not work if the wrong tone.

b. Carefully check the solder joints: 1. Check all solder joints are not "false Copper Welding Electrode" phenomenon!
2 Check the joints and there is no short circuit between the solder joints.

c. spare power connection only after the above effort.
1. Pay attention to whether there is sufficient battery power, and sometimes buy back the new battery may also be low.

Two the circuit does not work, what should I do:
a. Unplug the power to re-check.
b. Check the battery voltage.
c. suspected spot problems, heated soldering iron, solder and then solder each one, you can not add during the tin.
d. production failure, usually pick the wrong parts and poor welding! damaged part itself is low.