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Auto power on: Automatically power on after installing the battery, it will be turned on without pressing the power button. Mainly due to the short circuit of other components on the short-circuit line of the Tianji key to the ground, it can be solved after cleaning with alcohol. Basic concept appliance repair knowledge

Please check the following items before the appliance is repaired. It is very likely that you can solve the problem yourself.

TV repair

The TV is not powered: Check that the mains and plug are in good contact.

There is no sound: Whether to adjust the brightness to a minimum.

There is no sound: Whether the mute switch is pressed and the volume is debugged to the minimum.

Snowflakes or murmurs are large: first determine if the CCTV signal is normal, and if the antenna plug is not in good contact.

Poor color: Is there a non-magnetic anti-magnetic speaker next to the TV, and the magnetic device, the color system of the TV is correct?

There is noise in the sound: Check if the TV system is correct.

The remote control cannot be used: Try replacing the battery.

DVD repair

Can not read the disc: Whether the disc is reversed, whether the disc quality is poor.

The numbers move around without being silent: check that the connection is correct.

No sound or no image: Is the right AV port paired correctly?

The remote control cannot be used: Try replacing the battery.

Audio repair

Silent: Whether the corresponding function key is selected (such as playing the CD should select the CD button).

There is sound on one side and no sound on one side: balance adjustment is normal.

Cannot record: The tape is prevented from being erased.

The remote control cannot be used: Try replacing the battery.

Air conditioning repair

Maintenance and cleaning of air conditioners are the main key to air conditioning maintenance, which is conducive to improving the cooling effect, reducing the cooling time, facilitating air conditioning energy saving, and prolonging the service life of air conditioners. It is an important part of rational use of air conditioners and strengthening standard management. In the past, air-conditioning users paid insufficient attention to the maintenance and cleaning of air-conditioners. It is now necessary to strengthen work in this field and promote the development of the air-conditioning industry.

Maintenance before starting the machine usually uses the home air conditioner to shut down in September, and will not start until May to June of the following year. Therefore, before the air conditioner is turned on, it must be done a comprehensive "diagnosis". Check whether the air conditioning equipment is "defective". According to the results of the inspection, under the guidance of professional and technical personnel, do a good job of maintenance and cleaning. This maintenance and cleaning should be in place. The outer casing, the airframe, and the filter of the outdoor unit and the indoor unit are included, and then trial operation is started to observe the cooling speed and effect.

Maintenance during the start-up process After the air conditioner is turned on, depending on environmental conditions, climatic conditions, number of power-on hours, surrounding dust, cleanliness of the air, whether the room is clean, and other factors determine the number of maintenance during the air-conditioning startup process. The environmental conditions are not good, the weather is hot, the air conditioner is old, the air conditioner is turned on for a long time, and the number of maintenance during the air conditioner startup process is increased, usually one and a half months. If the environmental conditions are good, the air conditioner is relatively new, the air is less dusty, the air conditioner is turned on reasonably, and it is used alternately with the electric fan. The maintenance period can be extended appropriately, from the air conditioner to the air conditioner shutdown maintenance 1-2 times. Maintenance should be serious and careful, leaving no dead ends. In line with the standard, improve the cooling speed and cooling effect, and achieve energy saving, fresh and comfortable.

After the shutdown, the weather is warmer, the air conditioner is turned on, the weather turns cold, and the air conditioner is turned off. This is a regular year. Note that the outdoor unit and the indoor unit should be thoroughly examined before the air conditioner is turned off. Maintenance, maintenance, cleaning must be a ring, can not be disconnected, easy to leak the link should be tightened, strict inspection, after completing the above steps, set the air conditioner hood to prevent dust pollution, prevent air conditioning drip and water, Keep clean and prepare for reuse in the coming year, so as to clean, save energy and extend the service life of air-conditioning equipment. For high-quality split machines of well-known brands, cabinets should be protected and the energy-saving effect should be fully exerted.

Air conditioning repair other knowledge: can not start or shut down: dial the power and try again.

Not cold enough: Did you take care of it for too long? Whether the temperature is adjusted properly.

Not enough wind: Whether the dust screen is blocked. Whether the air volume is adjusted to the right.

The remote control cannot be used: Try replacing the battery.

Refrigerator repair

Not cold enough: Whether the direct-cooling refrigerator is regularly defrosted. Whether the air-cooled refrigerator fan is stuck by ice.

Phone Repair

First, the automatic boot: automatic boot to install the battery, do not press the power button is turned on. Mainly due to the short circuit of other components on the short-circuit line of the Tianji key to the ground, it can be solved after cleaning with alcohol.

Second, automatic shutdown: the reverse process of booting, press the power button for 2 seconds or so to exit the display information, enter the network indicator light, backlight off, etc., automatic shutdown is also called automatic power off. Divided into three types: 1, vibration automatic shutdown: mainly caused by poor contact between the battery and the battery contact. 2, the button is turned off: as long as the phone does not press the keyboard, the phone will not shut down, the phone will automatically shut down, mainly due to the CPU and memory solder joints, it can be solved by welding. 3: Launch shutdown: The mobile phone automatically shuts down when the transmitter is pressed, mainly due to the power amplifier, which is generally caused by the power IC control.

Third, launch weak electricity, launch signal: 1: launch weak electricity: when the mobile phone is in standby state, it does not display weak electricity, a low-electric alarm phenomenon occurs after a phone call or more calls. This phenomenon is caused by the dirty interface or poor contact between the battery and the contact, firstly due to the poor interface between the battery contact and the mobile phone "target=_blank>, and then the power amplifier itself. 2: Launch Off signal: When the mobile phone is in the standby state, the signal is normal. Once the transmission is started, the signal will be dropped immediately. This phenomenon is caused by the failure of the power amplifier or the damage caused by the power amplifier.

4. Leakage: Leakage is after the power is applied to the mobile phone, it is not turned on, the current meter pointer has current indication, and the normal time is 0MA. Leakage of mobile phones is a difficult problem to repair. The first is whether the power supply and the power switch are burnt and cause a short circuit. The second is whether the amplifier is damaged. In the case that the leakage is not too much, add power to the mobile phone for 1 to 2 minutes and then feel which parts are hot. Some components will be bad. If the above method is still not solved, only find the line. Short circuit of resistor, capacitor and printed Wire . The resistance detection method can be used for the following processing: direct measurement method: rectifier diode, positive and negative resistance comparison, the smaller the forward resistance, the better, the larger the reverse resistance, the better, the positive and negative values ​​are close to be bad. In the road measurement method: passive components such as L, R, C, etc. are effective, and the error is large when measuring active components.

Five, no access to the network: not into the network can be divided into two types of signals are not into the network, no signal does not enter the network. At present, Ericsson and Samsung series mobile phones in the market, as long as the receiving channel is good, there will be a signal strength value display, regardless of whether there is a transmission signal, other series must wait until the mobile phone enters the network to display the signal strength value. For the range of other series of mobile phones, install the card, adjust the menu, and use the manual search method. Can find the network, prove that the receiving channel is good, the transmitting channel causes no access to the network; if the network is not found, the receiving channel is faulty, and the receiving channel is processed first. Signal instability (off signal): due to the solder joint component has a weak solder joint (failed to occur this fault). Mainly for the receiving filter, surface acoustic filter, IF filter and receiving IC and other related components repair welding OK.

Fax machine repair

Canon 270/450/490/750, etc.: Put SW2 on "NCU" from A to B and press "USER DATA" "#"

Canon T800: Press the “Data Registration” search button down button “SET” “#” to search the up button “SET” Canon T550: Press “Function” “4” in turn and search with the search button until “USER DATA” is displayed and then press “ START”“#”.

Canon T40/50: Turn SW6 on the main control board SCNT to “OFF” and press “Function” “#” “any key” “SET”.

Canon T410: Turn the NOMAL switch on the NCU to TEST, turn the MEMORP on the side to OFF, press the “TTI” “#” direction right button, and press any key from 1 to 7.

Canon B320: Press “Function” “2” “START” “#” “START”.

Canon B200: SW702 from A to B, press "Function", "2", "SET", "#", "SET". Canon L250: Press “Function” “<” “#” in turn.

Canon L400/500/600/800/900/MPC70/B210C: Press “Data Registration Key” “#” in sequence.

Canon MPC70/B210C: Press “Function”, “Data Registration Key” and “#” in turn.

Canon B150/155/L380 Press “Function” “〉” “Start” “#” “Start” in turn. After the above machine enters the maintenance mode, search until “#8 CLEAR” is displayed and press “SET or START” to enter and search until “ ALL” Press “SET or START” to complete the total.

Note: Canon's maintenance mode is mostly “data registration +#”. If you encounter an unseen machine, you can try it by referring to the above method.

Canon T11/20/22/30: This is the product of Taiwan Jinbao for Canon OEM, so the operation method is slightly different. Cold start method: Press and hold the “Function” button to turn on the power before powering up, and then release it after standby. Press the “Function” button to find the maintenance mode: Hot start method: In the standby mode, press “Function”, “well”, “7” and “8” to clear the program.



Http://news.chinawj.com.cn Editor: (Hardware Business Network Information Center) http://news.chinawj.com.cn

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