Speedtouch model 3EC18804GCAA01

Make sure the battery is in right and the locks are in position. Check the A/C adapter. A lot of them have an led light that is lit then it is working. If you have a voltmeter check the male plug(the one that plugs into the unit) for d/c power It should read 9-12 volts or somewhere in that range depending on the units a/c adapter voltage specifications. While the adapter is plugged in, place the ground probe on the outside of the plug and the positive probe on the inside to check voltage. If no voltage is present than the adapter is bad. Also check the battery it could be shorted out If not the receptacle in the motherboard is bad and the motherboard will need to be replaced which will cost close to what a new tablet costs if you cannot do the repair yourself.

Are you asking for the wiring diagram inside the main Battery?

If so, due to very possible injury, or death to you, there will be No solution.

Now, if you are talking about what is the polarity for the plug of the AC adapter, (Charger), that plugs into the DC Power Jack on the laptop, (DC _IN), then I'm on board.

The Center Hole in the plug end is the Positive ( + ) connection.
This is where the Positive (Red) probe lead of the multimeter goes.
The cylindrical outside metal shell is the Negative connection.
The Negative (Black) probe lead of the multimeter touches here.

Voltage is 19 Volts DC.

Wiring diagram for the inside of the AC adapter itself?
No gottom.

Regards,
joecoolvette

Believe it or not, unplug the AC adapter (Power Adapter) from the surge protector, and plug it directly into the wall socket.
Try this first.

1) I believe the power adapter is rated at 12 Volts DC, and 2 Amps, for the output voltage, and amperage.
(12 Volts times 2 Amps = 24 Watts.
12V X 2A = 24W)

Use a multimeter, and test the voltage coming out.
You can buy an economical multimeter for around $8 to $12. A lot of stores carry them. An auto parts store is but one place.

The plug end that plugs into the laptop, is cylindrical in shape, and has a hole in the center.

This is DC voltage you are testing.
The metal center of the plug is Positive. The outside shield surrounding the plug is Negative.

The Function Knob should be turned to DC Voltage.
(If it is a symbol, it will be a dotted line above a solid line.
NOT a curved line on a dotted line. This is for AC voltage)

If there is more than one scale, set the Function Knob to DC voltage 0-50 Volts.

The Red probe lead of the multimeter is the Positive lead.
The Black probe lead of the multimeter is the Negative lead.

AC adapter plugged into power, the Positive probe lead is inserted into the center of the plug.
Be SURE it doesn't touch the outside metal shell at any time.

The Negative probe lead is touched to the outside metal shell.

See if the voltage reads 12 Volts.

AC adapter (Power Adapter) checks out OK?
Suggest there is a problem with the small circuit board inside the MyBook.

Inside the MyBook WD500H1U-00 is an ordinary harddrive.
It is a desktop sized harddrive. 3.5 inches across in width.
(3 and a half inches, or 8.9cm)

It is a SATA harddrive.

http://www.youtube.com/watch?v=6FlySnyJ0CQ

Inside that plastic MyBook case is also a small circuit board. An interface circuit board.

The harddrive plugs into the interface circuit board directly, or there is a cable, or cables, that plug into the harddrive from the interface circuit board.

It is this interface circuit board that goes bad most of the time.

You can remove the harddrive out of the MyBook case, and put it inside a desktop computer that uses SATA harddrives, as a Slave drive.
Retrieve your information, and burn to disk/s, or flash drive/s.

{DO NOT move any jumpers on the back of a SATA harddrive. These are for the factory ONLY}

Or you can buy an adapter that the harddrive plugs into, and it has a USB cable.

http://www.tigerdirect.com/applications/SearchTools/item-details.asp?EdpNo=2583340&CatId=3770

Or you can put it into a 3.5 SATA external enclosure, and use it as an external harddrive again.

http://www.tigerdirect.com/applications/SearchTools/item-details.asp?EdpNo=2145406&CatId=2780


For additional questions please post in a Comment.

Regards,
joecoolvette

If you're in the US, go to Radio Shack and buy a plug in transformer that puts out 12VDC at 1000mA.
The polarity is negative (-) on the outside and positive (+) on the inside.

Hi, Here all the specs of the Power adapter you looking for. Thanks and have a nice day ! J -
- Adapter model: ADP-18LB C
- Adapter Input: 200-240 V / 50-60 Hz ~ 400 mA
-Adapter output: 24.0 V - 0.75 A Output Plug - Outside Diameter (mm): 5.50
- Output Plug - Inside Diameter (mm) : 2.10
-Output Plug - Barrel Lenght (mm) : 12.00
- Output Plug - Polarity : Center positive.
thanks and have a nice day J -

I have one of this and is wall transformer is 120 Vac imput voltage. 12Vdc output voltage x 1000mA current, with minus outside of plug and plus inside

According to several sites this monitor needs a 12-volt 4-amp adapter. Virtually every laptop that uses a coaxial power plug has the center pin positive and the outside shell ground. A Google search for "ct1810 replacement adapter" turned up several sources. Here's an eBay auction currently running for one vendor. If you're outside the US you should be able to find a suitable replacement on the Internet or perhaps locally.

Mustek 600 III EP Plus scanner, it doesn't matter what is the adapter input voltage is (base on your local country power supply voltage), but as long as the adapter output plug in your scanner is +15VDC/1A Positive Polarity (positive inside and negative outside), then your scanner will work.

See what the output voltage the adapter says, it may be 19.5VDC @ 3.34A.
Set the Multimeter to read 20 volts DC or more.
Put the Black lead on the outside of the plug (negative), and the Red lead inside the plug (positive).
They usually have the positive as the hole in the plug.
Look at the reading on the meter, if the power adapter is working it will read around about the stated voltage but none of them are completely accurate. It may be a little more or a little less.
If it is nowhere near the stated voltage then there is a problem with it.

Wal-Mart ectronics dept. has an "Universal DC Adapter Kit" it will have various size adapter plugs and a variable setting to adjust DC Voltage. It also should have a switch to set the polarity. I used mine to power several different devices. It was well worth the money I spent as opposed to buying a actual DC Adapter. Subsequently, the kit from Wal-Mart was far cheaper than the real deal.

-marshall.
Albuquerque, NM