Question about Radio Shack Pro-94 Scanner

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The center pin of the external power supply jack is broken off. Is there some place who repairs scanners ?

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Your second option is to re route the track so by solder 2 wires to the original power input and routing them to the ear phone socket make sure to disconnect the wirering from the ear socket first ,on your power supply unit remove the jack and replace with ear phone jack makes sure to put positive to centre and other to ground earth

Posted on Dec 06, 2011

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Radio Shack still has the charge jack available as a replacement part (I have ordered and recieved them during early 2010) You will have to take apart the scanner and unsolder the old one from the printed circuit board, and solder in the new one. If you don't have the equipment and skills to do this, find someone that does. This job is no big deal to someone who does electronic repairs. I hope this helps.

Posted on May 06, 2010


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1 Answer

I need to know the the circuit board polarity on a Pro-91 scanner from radio shack

it should be marked in two places, first on the back of the power supply and then next to the power jack itself.

According to the owners manual the center pin is negative. This is somewhere after page 10,11 or 12 in the manual...

Feb 17, 2015 | Radio Shack Radio Communications


Laptop is plugged in but says it is running on battery.

You have your laptop plugged in but when you check it says that you are running on battery. Or, you have your laptop plugged in and it will not work because the battery is dead.

Both scenarios depict a broken power port on the laptop or possibly a bad power supply. Checking the power supply is easy. Using a DMM on volts DC set to 20 place the red lead on the center pin and the black lead on the outside of the plug assembly. If you do not have the correct voltage as listed on the power supply then you need a new one. While holding the leads on the power plug wiggle the wiring to make sure there are no breaks. If the power drops to zero at any time you need a new power supply. A good site is .

Many times people do not realize that their power port is broken until it is too late. If you continue to use your laptop after the port is broken you will destroy the power supply portion of the mainboard and it will cost you half as much as the laptop cost to repair and may make it not worth fixing.

When you realize that your laptop is not running on AC power, and it could be intermittant, you need to immediately take it to a repair facility to get the jack replaced. The average cost should not exceed $150 US.

This is not a repair procedure that I can walk you through. You can only get your unit repaired at an experienced reapair facility.

Thanks for using FixYa and for the great rating. Please consider a testimonial. Thank you.


on Nov 13, 2010 | Computers & Internet

1 Answer

Broken central pin on power jack of Asus Eee PC 1015ped

I realize I'm providing a solution to an older problem, and may never hear back from the original poster.
I am providing a solution because in the event it may help someone else.

The center pin you state is part of the DC Power Jack. The jack on the laptop, that the plug from the AC adapter (Charger) plugs into.

The center pin is the Positive connection.
The outer metal pieces, on the inside of the cylindrical shape surrounding the center pin, make up the Negative connection.

Click on the two views shown of the jack to enlarge.
The view on the left, shows how the jack normally sits on the motherboard. Front faces you, and in upright position.

The view on the right shows the jack upside down, and the back faces you.
Note the 4 metal tangs which protrude up. Each has a squarish hole in it.

These tangs go through the motherboard, and are soldered to the motherboard. These tangs are Negative connections.
They connect to the metal pieces inside the cylindrical shape.

Looking at the Back of the jack, (Right view), you see a metal tang coming out of the center.
This tang is the Positive connection. It attaches straight to the Center Pin.

To replace the DC Power Jack, the Eee needs to be completely disassembled down to the motherboard in your hands.

(Observe Anti-Static Precautions. Use an ESD wrist strap. Average cost is around $3 to $6. Connect the alligator clip to a good ground source.
{ I connect to an unpainted surface, of the metal frame of an open, empty desktop computer case )

The broken DC Power Jack is c-a-r-e-f-u-l-l-y removed from the motherboard, and after the area is prepped, the new DC Power Jack is soldered into place.


Oct 20, 2011 | ASUS Eee PC 1005HA-PU1X-BK Netbook

2 Answers

Pedal works with power supply but nor with a brand new battery

The problem is with a bad power connector.

The connector has a spring tab that touches the center pin when the external power is NOT plugged in. This tab brings the battery power to the center pin. Some of the springs as an alternative act as a switch to a contact for the negative lead of the battery. These suffer the same problem of loss of spring tension and failure to contact.

The spring gets weak and no longer touches and battery power will not work.

Feb 17, 2010 | Boss Music

1 Answer

Internal ac pin broken acer laptop

Is this a desktop or a laptop? If this is a desktop easiest cheapest solution buy new power supply. If this is a laptop you need to purchase a new ac jack adoptor, and take it to an electronics shop or bring / send it to a repair facility and what will happen is an IT Professional (such as myself) will carefully disassemble the laptop and then remover the motherboard entirely placing it in a static case. Then we will transport it to an sub-contractor generally an electronics specialist who will de-solder the jack and remove it placing new solder on the board and then soldering the new jack into place. Once completed the board will be transported back and the laptop will completely be re-assembled and you will be looking at around a $180 - $265 dollar repair bill. Do this quite often as with some expensive laptops this is very cost effective. Visit us on the web @ or contact me personally @

Jan 14, 2010 | Acer (5604430611) Power Supply

1 Answer

The power cord jack is broken out of both my toshiba laptops how can i repair them

You will have to take the laptop completely apart in order to gain access to the power jack. Once there, inspect the connections to the MB, sometimes they just dry up and heating them up with a soldering gun does the trick. The positive connection is usually the culprit, as there are at least 2 ground connections on every jack. It is the one that comes from the center pin of the jack. If it looks and feels loose, that might be the problem. Try to use none or as little solder as possible to get it back in its place. Hope that helps

Nov 25, 2009 | Toshiba Computers & Internet

1 Answer

Acer Aspire 3690 Laptop is dead


You may have a broken power jack in the laptop. Inspect the power jack and see if the center pin moves at all. It should be fairly solid. If you find a bad jack your local repair shop may be able to repair it or you can get a jack from Ebay and solder it yourself.

I hope this helps,
Corporate Computer

Jun 20, 2009 | Computers & Internet

1 Answer

Center Pin External Power Polarity

Problem is just external...First try in another pc,if it still wont work so just buy new external and put that hdd in new external...

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6 Answers

Plug in is broke

you cant buy a new one..........

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