2016年12月17日星期六

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How to Install a Car Stereo

Installing a new car stereo can often be simple enough to do yourself, and his article will provide you with a general guide on how to do it. Keep in mind that some cars and systems are more complicated than others and that every car and stereo system will be different, so some specifics may vary. Be sure to read any instructions that come with the new car stereo before attempting to install it.

1、Taking Out the Old Stereo

  Set the parking brake and disconnect the negative cable from your car battery. 

  Be sure to do this to avoid short-circuiting the electrical system during the installation.

  Unscrew any screws that are securing the trim in place

  Be careful to remove all screws before trying to pry off the trim or you may break it.

  Remove the trim.

 For some cars, you may need to remove several pieces of plastic trim, usually working from the bottom up.

   If you need to remove trim that includes any knobs or drawers, remove them before trying to pry off the trim.
    Use your hands or a pry tool to pry off each piece of trim. Pry tools are specifically for this purpose and will not damage the trim pieces

  Pull out any necessary components.

   If you need to remove any components before being able to access the stereo, do so.

    Disconnect components that are wired to the car. Take a picture of how each is wired for later reference.


Loosen the stereo.

 Different cars may have varying elements securing the stereo in place.

    If the stereo is held in place by screws or nuts, loosen them with the appropriate tool (screwdriver or nutdriver, respectively).
    If the stereo isn't held in place by screws or nuts, you'll need to use a radio-removal key. This tool is commonly necessary in Ford vehicles. Radio-removal keys (sometimes also referred to as radio-removal tools) will typically either be in an elongated horseshoe shape or will have a circular shape at one end and a notched shaft at the other. They’re available at most auto-parts stores.
    Insert the keys into the two small slots in the face of the stereo. You will release a mechanism holding the stereo in place. Slide the radio-removal keys into each slot again until you feel the stereo loosen from in its housing. You should then be able to pull out the stereo relatively easily.


Pull the stereo out of the panel.

 You may want to use needle-nose pliers to grip the edge of the stereo and help you pull it out.Pull it gently, and if the stereo doesn't come out easily, double check that you haven't missed any components that may be holding it in place. 

Take a picture of how the stereo is wired.

  This is an important step because the photo will serve as a reference later when you’re wiring in the new stereo.

 Unplug the stereo connections.

 You’ll see a series of wires connected to the back of the stereo, and you’ll need to disconnect each of them.

    First unplug the antenna wire, which will typically be a thicker wire plugged in separately from the rest. Once it’s unplugged, you should be able to move the stereo around more freely.
    Next unplug the each of the wire harness connectors. There will typically be several of these and you can recognize them because a series of wires will feed into each one. The plastic piece into which the wires are fed should have either a tab or a button you can push, which will release the harness.


2、Installing the New Stereo

 Match up the wires

     Match the wires of the car’s harnesses to the new stereo’s harnesses. Each harness connector is unique, so it should be easy to figure out which ones fit together.

    To be safe, check the wiring diagrams for both your car and the new stereo to verify you’ve connected them correctly.
    If your car's stereo doesn’t use wire harnesses, you’ll need to match up each wire manually. The wires are color-coded; however, the wires on an after-market stereo may not match with the color-coded wires in your vehicle. It's best to study and follow the wiring diagram that came with the stereo.
    Connect the matched wires. There are two options for connecting the wires, crimping or soldering. Crimping is faster and easier, but soldering will provide a more stable and secure connection. Be sure to use the proper size crimper and don’t try to bundle the wires with tape — it will eventually dry out and fall off. Bundle wires using zip ties instead.

 Assemble the mounting kit.

 If your new stereo came with a separate mounting kit, assemble it according to the stereo's instructions (it will often mean fitting a metal housing sleeve into the mounting frame).

    Push down on the tabs located around the metal sleeve with a screwdriver to secure the metal sleeve in place.

 Connect the power source.

 Typically, if you have a wiring harness, this connection will be made when you connect the new stereo harnesses to the harnesses in the car.

    If you aren't using a wiring harnesses, you’ll need to manually connect the power. Determine whether your car has a switched power source (typically a red wire) or a constant power source (typically a yellow wire). Some vehicles even have both types of power sources. For more information on switched versus constant power, go here.


Ground the stereo.

 If you're using wiring harnesses, this connection will be made when you connect the harness pieces.

    If you aren't using a wiring harness, you'll need to locate the bolt, wire, or screw that connects with the car's bare metal chassis. Loosen the bolt, wire, or screw and slip the stereo's ground wire (usually black) underneath, then tighten.
    Note that the ground connection is important to the optimal performance of the stereo. If the ground wire doesn't connect to the bare metal, it won't work. And if the ground wire connection is loose, it could result in poor audio output. Sand down the area with sand paper to ensure a good connection.

Connect the remaining wires.

  Plug in the antenna cable and connect the stereo's wiring adapter to the the car's wire harness. Connect the output converter if one is needed to make the new stereo compatible with the car's audio system. 

3、 Test the stereo

 Turn the power on and test the AM, FM, and CD components. Test the fade and balance settings to be sure the speakers are working properly. Turn the power back off. 

 

Finishing Up

  Push the stereo into place

 When the stereo is fully in, you should hear it click into place. 

 Reconnect the components

 Fasten in any screws that are needed to hold the stereo in place, reconnect any wired components, and replace any knobs or drawers that were removed. 

 Snap all the pieces of trim back into place over the stereo.

 Double check that all screws and trim pieces are securely in place. 

  Try out the new stereo.

 Turn the car power on again and play around with the stereo and its settings to be sure everything is in working order.

 

2016年12月11日星期日

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2016年12月8日星期四

How to Disconnect a Car Battery

An automotive battery is a rechargeable battery that supplies electric energy to an automobile. Traditionally, this is called an SLI, for starting, lighting, ignition, and its main purpose is to start the engine. Once the engine is running, power for the car is supplied by the alternator. Typically, starting discharges less than three per cent of the battery capacity. SLI batteries are designed to release a high burst of current, measured in amperes, and then be quickly recharged. They are not designed for deep discharge, and a full discharge can reduce the battery's lifespan.

 Steps

1、Take the necessary precautions before you try to disconnect your battery. Besides holding a potentially lethal electrical charge, batteries contain corrosive agents that can produce a flammable gas. Before you remove your car's battery, take these safety steps。

*Turn off the ignition.

*Wear safety goggles and gloves to protect your eyes and hands.

2、 Find the negative terminal on the top of your car's battery. 

It usually has a black cover. The battery itself may have a minus sign near the connector post. The positive terminal usually has a red cap or a plus sign on the battery near its connection post. 

 3、Determine what size socket you need to loosen the nut on the negative terminal. Always work on the negative terminal before the positive when you disconnect your battery. 

*Grab a socket from your socket kit and hold it near, but not against, the nut on the negative terminal of your battery. Ascertain visually the socket size you'll need to loosen the nut. 

* Put the appropriately sized socket on your wrench. You might have to attach a wrench extender to reach the nut.

* Put the wrench on the nut on the negative terminal and turn counterclockwise (remember: righty tighty, lefty loosey). It will take only a few turns to loosen it.

*Pull the negative connector from the battery after you've loosened the nut. Push it aside so it is unable to make contact with the battery while you're doing your work.

* If the cable is seized to the battery post, a special battery cable removal tool may be needed to remove the negative connector. Ask your local auto parts store or mechanic.

4Follow the same procedure to disconnect the positive terminal. 

 After removing it from the terminal, don't let the positive connector touch any metal part of the car. There is residual current in the system that, if it were to touch a metal surface, could disrupt or damage the circuits in the vehicle. 

5、Continue with your work. 

 With the battery cables disconnected, you can safely perform repairs on electrical components of the vehicle. If you just need to put in a new car battery, it can be done in a few simple steps.

* After the battery is disconnected, unscrew the brackets that hold it in its tray.

*Lift the battery straight up, out of its tray. Keep in mind that car batteries can weigh 40 lbs. so ask for help if you need it.

* Using an old toothbrush, brush the tray and battery cables with a diluted baking-soda mixture and allow them to dry before putting in your new car battery.

*Place the new battery on the tray and tighten the clamps. 

*Connect the cable for the positive terminal first, then the negative. Remember to securely tighten the nuts on each.

*Close the hood and start the car. 

*Dispose of the old battery properly. The auto-parts store you bought your new battery from probably will take the old one as part of its service arrangement. If not, take it to a recycling center or automotive garage. Most accept old batteries for a nominal fee. 

 

2016年12月2日星期五

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How to Repair a Broken Car Radio CD Player

A car radio CD player is something that you will find may need to be repaired from time to time. There are a handful of things that could be wrong with your CD player. It is up to you to find the source of the problem and attempt to fix it. Having to purchase a new CD player every time something goes wrong with the one you have can get to be very expensive. This is why it is a good idea for you to figure out how to fix your car stereo CD player for whenever it begins to act up at all.
Materials Needed

    Cable
    Contact Cleaner
    Soft Cloth
    Drawer Loading Belt

Step 1 – Sound Quality

If your auto CD player is having sound quality issues, then there are a few things that could be wrong with it. You will need to look over all of the cable connections. They need to be completely secured. You may end up needing to replace the cable that connects the receiver and the CD unit. Make sure that you clean the contacts that are on your CD player. This is something that you will be able to do with a contact cleaner that is electronic grade.
Step 2 – Skipping Problems

If the disc you are listening to is skipping, then take it out and examine the CD. If the CD is dirty or scratched, then this could be the problem. However, if your CD is clear of debris and scratches, then it may be the laser lens. Test it out on multiple CDs that are clean. If there is skipping with all of them, then you will need to clean your laser lens.
Step 3 – Disc Recognition

If you find that the discs you put in are not being recognized, then you may be putting them in the wrong way. Make sure that the CDs you are putting in are being put in right side up. The label should be on top when entering it into your player. You may also need to clean your laser lens or unengaged the transportation lock. The lock will be a screw that is on the bottom of your unit.
Step 4 – Loading Door

If the door is having issues opening or closing, then it could be a problem with your drawer loading belt. You will need to make sure that the belt is elastic and tight, if it is not, then it is time to replace it. You will be able to find these belts at most electronic part stores. You will want to make sure that the replacement belt you get is one that has the same amount of thickness or just a little bit more. Make sure that it is not so tight that the motor has to strain. Make sure that there are no gears that are loose or broken, replace them if necessary. Also check for any debris or hair that could prevent any of the moving parts issues.

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