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What voltage should be read on each pin of the power adapter?

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Hello ,, this information is based on ScanJet 5400C - (C8517V) -- if yours is other p/n, let me know

What voltage should be read on each pin of the - power_module.gifpower_cord.gif

North American use , C8517-84200, Low power AC power module (Wall Mount Type) - 100-120VAC, 60Hz - Detachable power cord not needed (USA, Canada) - NOTE: Use a High Power AC Power Module if an Automatic Document Feeder (ADF) is attached

European use , C8517-84201, Low power AC power module (Wall Mount Type) - 200-240VAC - Detachable power cord not needed (Europe) - NOTE: Use a High Power AC Power Module if an Automatic Document Feeder (ADF) is attached

Worldwide use , C8517-84201, Low power AC power module (Brick Type) - 100-240V input - Requires a 3-wire detachable power cord - For worldwide operation - NOTE: Use a High Power AC Power Module if an Automatic Document Feeder (ADF) is attached

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Posted on Nov 13, 2010

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Problem with HP 8510q laptop charging. Charging not working. Laptop working only that time when i have power in battery. Charging light not show. I try other charger but same problem. Is it inside some...


Inside? Yes. (If 'charger' is good)
Fuse?
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Diagnostic flowchart:

A) AC adapter (Charger), has to be KNOWN to be good, before going on.
Used on a working laptop to see, or multimeter is used to check Voltage (DC)

The plug end that goes to the laptop, from the AC adapter, has a Center Hole, and a cylindrical outside metal shell.

The Function knob is set to DC Voltage. If just a symbol, the symbol is a dotted line over a solid line.
If more than one DC Voltage scale, the Function knob is set to the 0-50 Volt DC scale.

The Positive (Red) probe lead of the multimeter goes to the Center Hole, and the Negative (Black) probe lead of the multimeter, goes to the cylindrical outside metal shell.

You should be reading 19 Volts DC.

Also have an assistant gently wiggle the cable FROM AC adapter TO laptop, and the power cable TO AC adapter.
If there is a fluctuation on the reading, there is a broken wire, or wires, in one of those cables.

B) Check the DC Power Jack.
This is the jack on the laptop (DC_IN) that the AC adapter plugs into.

Has a Center Pin, and an inner cylindrical metal shell.
Battery removed, use an eraser on the end of a No.2 pencil, and see if you can GENTLY wiggle the Center Pin around.

ANY perceptible movement of the CENTER PIN, means replacing the DC Power Jack,
(By the way, is it an 8510p, or 8510w?)

http://www.alldcjacks.com/en/ppj052-laptop-dc-power-jack.html

Any movement of the rest of the DC Power Jack (Body), means replacing it; or may just mean the solder joints are cracked, and can be re-soldered.

C) AC adapter and DC Power Jack checks out?
Problem may be with Power MOSFET's on the motherboard, and associated MLCC's.

(Multi-Layer Ceramic Capacitor, and they are SMD/SMT just like the Power MOSFET's.
Surface Mount Device/ Surface Mount Technology)

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http://koti.kapsi.fi/jpa/stuff/pix/travelmate_6292/

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Veypor VR2 performance computer, troubleshooting speed reading


On my Veypor VR2, it developed a problem where the speed reading would not indicate as it normally did. At first I thought it was sensor at the wheel not picking up the magnet as it rolled past, but as it turned out the problem was in the VR2 unit.

To check if you may be having the same problem as I did, plug in the AC power adapter, and with a DMM, measure the voltage between the two pins at the upper left corner; (looking at the back with the connector at the bottom).
The left pin is ground, and the second pin is the speed sensor input pin.
The voltage should be 5V. If you take a wire and touch it between the two pins, you should see a reading on the speedometer. If you do, then the unit is probably okay, and you'll have to look at the Hall effect speed sensor.

In my case there's a transistor in the unit used to switch the speed signal that started going bad, and the current leakage pulled down the voltage.
After replacing it with another PNP resistor, the voltage at the speed sensor input pin went back up to 5V, and it worked normally again.

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Can this computer be used in Australia without being damaged?


Most laptop can be used in any country.
Check the laptop's power adapter mains input voltage, it is on a label on the bottom of the adapter.
If the input voltage is 100 to 240 volts then it will work in Australia, you may need an mains adapter to connect to Australian 3 pin mains power point or purchase the mains cable that fits the Australian 3 pin mains power point.

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All whistler models run on 12 volts and the center pin of the power cord is positive.

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I have a Casiotone MT70 made in 1984. How do I check the polarity as I need to get an AC Adaptor and don't want to damage the keyboard?


Here is how you might check the polarity of a 7.5 volt DC replacement adapter:

Put the 5 batteries into the unit and verify operation. NOW using a DC voltmeter measure the voltage from battery negative and meter negative connected and meter positive to the pin on the power jack. IF you see 7.5 volts positive, then the pin is the positive lead for the adapter.

If you see zero, then continue testing.

With the 5 batteries inserted, connect the positive meter lead to the positive of the stack of batteries. Now touch the negative meter lead to the pin.
If there is 7.5 volts there, then the pin is the negative lead for the adapter.

READ THESE INSTRUCTIONS CAREFULLY.

USUALLY the jack has a contact that disconnects the batteery when the plug with sleeve is inserted.. We are testing the jack without inserting a plug here so the plug should HAVE THE BATTERY VOLTAGE with correct polarity on the pin.

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As long as the Voltage matches it does not matter where the power originates from. The voltage must match exactly to the adapter readings. Hope this helps.

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