Guide: Today is to disassemble a wireless touch keyboard K400R from Logitech. This originally a product of Logitech for the living room computer application, and the author later found that it is also very convenient to use in card computers such as the hustle, so introduced to everyone here. The article objectively introduces this keyboard worth buying and there is an unbeatable regret, and has a comprehensive analysis of this keyboard from the outside world.
Products and use tools
Logitech K400R wireless touch keyboard, screwdriver
Body
This is the upgrade version of Logitech for Windows 8 systems and the previous K400 keyboard. The appearance and specifications of this keyboard and K400 are basically similar, all with 2.4G wireless transmission methods and with a 3.5-inch touchpad.
This keyboard supports Logitech Excellent Technology and is standardly available. In this way, the keyboard and other Logitech mouse supported, the keyboard mouse and touchpad can be simultaneously implemented on a USB interface, which is very practical.
This keyboard is best suited for WIN8 and above systems, but it can also be well compatible with WIN7 and XP systems. In addition to connecting to the computer, this keyboard can directly connect many Android or other operating systems in the market, general Very good. The author started this keyboard mainly used the card computer Raspberry in the previous fire, and later found that this keyboard can also apply to various versions of the Linux system, the author's pro test (including the latest B +) Version, BB-Black, banana sent perfect support. In particular, the number of USB interfaces on the board is not allowed, and this keyboard is particularly convenient.
However, this mouse is the most suitable application scenario or living room because it is designed for smart living room applications. As will this, we can lying on the sofa to enjoy easily wireless control.
Let us take a closer look at this keyboard. The keyboard uses a relatively simple packaging method and does not feel very high.
The keyboard has two accessories (Yipin receiver and USB extended head) have corresponding instructions tags, clearly tells you its way.
The front side of the keyboard has a black and white ABS plastic, and the surface has been treated, but the personal feeling is not very good, the bite is too thick, and it is not delicate. In addition, the thin-priced ABS material causes a relatively shallow, and cheap ABS material causes the housing strength to be too bad, and people feel that the keyboard is in soft. Compare the wired keyboard of another PC material case, it feels different in your hand. This may be a regret of this keyboard!
In addition, this keyboard is relatively poor, and does not use the scissors structure, which belongs to the button of the old-fashioned silicone bomb pad. Not suitable for long typing, but the mute effect is still possible. This may be related to its living room application, or it may be because it is an entry-level low-end keyboard. This is also a more regrettable place in this keyboard. In short, the feel of the appearance and button determines that the grade of this keyboard is not enough to rank among the top, it is probably practical economy!
Below is a keyboard I have known as the foreign trade tail order, thirty-five dollars, no brand, but the keyboard quality absolute lever. The outer casing of the PC material, the cutter button, the ultra-thin structure. The K400R is indeed from the appearance and button, but the function is inferior. Also, cheap things, and bear palms can't always come.
This keyboard uses two ordinary AA batteries (random standard), designing battery life for 1 year, power consumption is still relatively low. There is a space to store the receiver next to the battery bin, which is more convenient.
This 3.5-inch touchpad is the biggest feature of this keyboard. The author feels very sensitive, supports multi-touch, and a variety of gestures. Perfectly support under Windows 8 system, other system part support, pointing, vertical and horizontal scrolling, Win8 boundary gesture, zooming in zooming.
Several function keys in the upper left corner of the keyboard is a functional button design, music, browser homepage, lock screen, and power button (which can be set to sleep, sleep or shutdown). In the uppermost corner, there is a maximum of the left mouse button, so that the keyboard handheld operation is easy to complete click and double click on the left hand.
The middle area of the keyboard is the location of the label, and the other Logitech products are different. There is no more words on the bottom plate mold, there is no more content in the label. Only models, excellent flags, authentication numbers, and flags on the label and Made In China. Thus, the case where the front key of the keyboard is used to adopt a general American keyboard, it can be speculated that the domestic version and overseas version should be exactly the same, of course, in addition to the packaging box.
There is a power switch on the side behind the keyboard, so that when the keyboard is not used for a long time, turn off the switch more saves the battery. Although this keyboard is very energy-saving, only one battery is changed one year, but it is recommended that everyone turns off the power after work every day. After all, love the earth to reduce the harmful garbage. Everyone is responsible!
In addition, there is a highlight in the keyboard structure, and the keyboard can stand upright, so you can minimize the desktop footprint when not.
The appearance introduces so much, and then begins to disassemble it. Workers must be good, and must first make a tool. Prepare a multi-headed screwdriver to prepare a special screw that suddenly comes out. However, until the end, I found that the entire keyboard only used only one model specification self-tapping screw, and finally used a medium cross screwdriver.
First, open the upper and lower shells. The upper and lower shells are connected together with 9 self-tapping screws, and two Tibetan tags, there are two hidden in the pad. After separating the upper and lower shells, it is seen that there is two boards, and the upper casing are fixed together, the touch control panel is fixed, and the lower casing is fixed together is a button control and a radio frequency plate. Two boards are connected together with a 6PIN FPC mount.
Then we look at the details of the button, the press is a separate activity, cover up with a whole backplane, very simple structure, no tall scissors.
The flexibility of the button is supported by the silicone pad below. This structure brings a poor button hand feel that people feel very regrett, this is probably the cost limit of the low-end keyboard?
Take a look at the touch control panel, the PCB of the touch control panel is only bonded with the above touch panel, and the hard disassembly is damaged. According to the principle, it is ideal that the positive PCB is just the touch PAD of copper. It is necessary to be flat, there will be no devices, so don't take it. However, we can see the only chip model, CY8CTMG200A-32L, which is easy to find out of this is a multi-point capacitive touch chip from the 5 inches of Cypress. . In addition, a semi-obstructed Cypress LOGO can be seen from the corner of the board, thus it can be seen that this touchpad is a holistic solution from Cypros, not just a chip. Cypress has a horizontal capacitance touch solution with industry leaders, which can be inferred that the touch of this keyboard is not bad, and the author is true.
Next, look at the lower casing, the circuit of the button is a transparent soft plate of two conductive coating circuits. In addition to the three bonds of the mouse, the keyboard portion of the keyboard portion is triggered by pressing the conductive electrical coating.
The bottom floor is the battery compartment is the button and the radio frequency control panel, printed with Logitera LOGO and BEIJING. The plate TOP layer is a connector, crystal, and a power supply circuit of the keyboard.
The Bottom layer only has only one chip, and it is a 2.4G RF SoC from Nordic (Nordic). The model is NRF24LE1H. Nodi is a professional RF device producer from Nordic. One mentioned 2.4G RF, the first thought is it, especially in the field of wireless mouse and keyboards. In addition, the layer of the board has also left a total of multiple test points, and a group is clearly marked is a set of SPI interfaces, and the other set is neatly arranged for a total of 10pin, and it is estimated that this SOC's debug entry. From this point of view, the keyboard that the author should be an earlier small batch version, as the production rules of the general product is to remove the test point used in the development commissioning.
Demolition here, the entire keyboard has been seen from the outside. All in all, the keyboard integrals for the living room application is reasonable, simple structure, and powerful touch. Electronic material materials are medium tyrants, but the buttons are used in the simple structure of the low-end keyboard, the hand feel is poor, the housing material is not very good, the strength is too soft, the surface treatment is general, and it does not come out. However, the price difference between 150 yuan is good, coupled with the Logitech brand for sale, or it is worth it.
Bamboo
Author Qindong4058
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