Tip & How-To about Viking K-2000-dva-multi-input Voice Dialer/annou

Power supply polarity for Viking K-2000-DVA

The center pin of the power jack on the unit is negative (-) 12 volts DC. It is also common to all of the input common terminals. This is important when using a common power supply for other equipment such as 12 volt battery backed system for an alarm system.

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2 Answers

Compaq CQ1-1225 AIO Wont Start at all. Removed all components


Suggestions;

Anti-Static wrist strap connected to ground source, and your wrist;

1) The jack your AC adapter plugs into on the motherboard, is the DC Power Jack.
Motherboard out of case, power to motherboard, take your multimeter and see if you are getting 19 VDC at the DC Power Jack's positive solder joint, on motherboard.

The center pin of the jack is Positive. (The inner cylindrical shell is Negative)
Follow the DC Power Jack's positive pin from the Center of the jack, to the motherboard.

You probably won't be able to touch your meter's Positive (Red) probe, to the DC Power Jack's positive pin under the jack; so touch it's solder joint on the opposite side of the motherboard.
(DC Power Jack should be soldered close to the motherboard, is why)

Of course also touch the Negative lead, (Black probe), of your meter, to the Negative, (Ground) solder joint for the DC Power Jack.

Getting 19 volts DC?

See if there is a cracked solder joint, for any of the DC Power Jack's pin connections to the motherboard.
ANY perceptible movement of the DC Power Jack on the motherboard, indicates a bad power jack, and may indicate a broken/cracked solder joint.
Center pin of DC Power Jack is loose? Bad DC Power Jack. Replace.

2) DC Power Jack is determined to be in good repair? No cracked/broken solder joints?
The next components in the power circuit on the motherboard, leading From the power jack, are P. MOSFET's.
Power MOSFET.

Power MOSFET Wikipedia the free encyclopedia

More information using a prior solution,

Dv6000 power light does not come on any more

Check the links given.

3) The last thing that concerns me, although I probably should have listed it first; is the AC adapter you are using.
Concern is that it doesn't have the 'intelligent chipset' that matches the Compaq CQ1-1225 All-In-One desktop PC's circuitry.

AC Adapter For Compaq Presario All in One CQ1 1225 Desktop PC Charger...


Just my thoughts..........
Regards,
joecoolvette

Jan 15, 2015 | HP Computers & Internet

1 Answer

how to wire koyo timer kt-v4s-c-d


Koyo kt-v4s-c-d is a 12-24Volt DC pin timer.
Timer mounts in a pin base, and wires are connected to numbered screw terminals on the base.
Timer has 12 pins, and is installed onto 12 pin base.
The base terminals are labeled 1 2 3 4 5 6 7 8 9 10 11 12
The 12-24V DC input voltage connects to terminals 11 and 12, and powers the timer mechanism. Positive to terminal 11, and negative to terminal 12.
The other terminals are dry, and receive no power when input is connected to 11 and 12, except the illustration seems to show the timer will electrically connect terminal 5 and negative charged terminal 12. Use multimeter to check each terminal after power is applied.

COM terminal is 8. Run jumper wire from one of the input terminals to terminal 8. When timer is OFF, then NC terminal 9 has power output. When timer is ON, then NO terminal 10 has output.
Timer functions are set using 8 dip switches.
Copy following link for some illustrations.
http://waterheatertimer.org/How-to-wire-pin-timers.html
Copy following link for timer manual.
http://www.automationdirect.com/static/manuals/koyotimerm/koyotimerm.pdf

Jul 12, 2012 | Hardware & Accessories

1 Answer

What voltage and polarity do the ACS-5 speakers require?


Computers always use DC voltage. Computer speakers receive DC voltage from the computer.
DC voltage has a Positive and Negative polarity.

In the power jack of the speaker, the Center pin is the Positive connection. The outer shell is the Negative connection.

Center hole of the DC adapter plug - Positive.
Outer shell of the DC adapter plug - Negative

Voltage 5 Volts DC.

In case you need it,

http://support.dell.com/support/edocs/dta/acs5/

Nov 29, 2010 | Computers & Internet

1 Answer

I have a Sangean ATS 818cs portable radio but no 6v lead input


Yes you can use any 6 volt DC for your radio but the most IMPORTANT thing to remember is to connect the terminals in the correct direcction. First of all you can solder a red wire from the positve terminal of the battery and a black wire from the negative terminal of the battery. This must be connected to the source of your 6 volt battery.You can buy a good DC jack socket female to be fitted into the vacant spot of your radio and use a male jack to supply the DC. Only be carefully to see the polarity. To avoid any reversing of polarity use can even connect a diode in the forwarrd bias towards the positve terminal. This will prevent any wrong connection of polarity to damage your set. Helpful? Good day

Jul 13, 2010 | Sangean ATS 818 AM/FM/SW Radio

2 Answers

MISSPLACED AC POWER SUPLY FOR "MY BOOK" 250 GB USB.


THE ANSWER TO MY QUESTION WAS FOUND OUT BY MYSELF BY VISITING A REPAIR / SERVICE DEPARTMENT AND MAKING ENQUIRIES CONCERNING THE DC OUTPUT OF THE AC ADAPTER ASSOCIATED WITH THE WESTERN DIGITAL, MY BOOK 250GB USB. tHE VOLTAGES ARE THESE. : - AC INPUT = 100 - 240 VOLTS 50/60 HZ
DC OUTPUT = 12 VOLTS ( REGULATED ) 2 - 0 A
CENTER PIN OF 12 VOLT DC INPUT PLUG IS " POSITIVE "

THANK YOU FOR THE SPACE TO ASK MY QUESTION.

Feb 18, 2009 | Western Digital My Book Essential Edition...

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