Question about HP Pavilion zd8000 Notebook

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Switching from ac to dc

Got my hp zd8000second hand. It won't continue to run when unplugged and is therefor not mobile. I there a settingpreventing it from going to batery power that I canchange?

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No settings to change but a new battery may not help either. There are a couple MOSFET's in the Battery line as well as other issues that can cause this. Try Battery first and if it does not help let us know.. Good luck!

Posted on Jan 18, 2008

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  • 139 Answers

The rechargeable battery is probably defective and will need to be replaced.

Posted on Jan 16, 2008

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Interior wall panel battery lights does not lightup when 120 power is not pluged


The lights run off of 12V DC and use your RV's batteries to run when not plugged in. When plugged in it uses the AC and converts it to DC and runs the lights.

Please check your battery disconnect switch. It's most likely off. In my Winne there is a battery disconnect switch which disconnects the two batteries near the door. Lights wont work when unplugged and the switch is off. Lights works when plugged in or unplugged and switched on.

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Ho do I get my VC RC-QS10 to run on its batteries?


my laptop only runs on 115 when plugged in no switching needed just unplug.

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What or how does the battery get its charge


Most bike have an alternator driven off the left-hand crankshaft shaft.
This turns with the engine, producing the AC charging power.
This power then runs through a voltage regulator, that both converts the the AC voltage into DC voltage, and regulates the amount of voltage flowing into the remaining electrical system.

Now, you did do the first step correctly.
DC volt meter to battery terminals to see if you get 13-14 volts DC with engine running.
Next, locate voltage regulator and unplug connector for wires coming FROM the regulator, and hook up the DC voltmeter.
With engine running, you should have 13-14 (or so) DC volts.

If not, locate and unplug wires coming from alternator to regulator, and hook up AC (note change from DC to AC) voltmeter.
With engine running, should have AC voltage (this could be 20-40 volts or more).

This will let you know where the problem is, and what needs to be replaced.

Apr 25, 2014 | 1993 kawasaki KLE 500

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VK 112 will power up but no sound, coming through


The valveking series of Peavey amps are valve amplifiers.

By "will power up" I take it you mean the power lamp is lit thus eliminating power plug, ac cord and on / off switch and main fuse from our investigations. Before we continue you must understand that valves are a voltage operated device and voltages around these components are dangerously high (200 to 400 volts is quite normal). Electricty is dangerous. You cannot see it, smell it or hear it. If you have any doubts about your ability to service this appliance do not proceed but seek help from your local srvice provider.
If you feel confident that your level of skill is good, then let us proceed. Unplug the appliance from the ac power and remove the chassis from the cabinet, you will now have access to the component side of the chassis. Reconnect the speaker. You will

require a multimeter (digital or analogue) set to the highest dc range. Connect the negative terminal of the meter to the chassis.

You are now ready to plug the amplifier into the ac power and switch on. Do all the valves light up in the output stage, can you hear a faint hum or buzz from the speaker. If all valves lit but no buzz disconnect ac power and measure dc resistance of speaker. If about 6 to 8 Ohms its ok. If infinite replace speaker. If ok reconnect ac power and continue with the next step. Measure the dc voltage on the anodes (plate) of each output valve and the voltage on the screen grids of the output valves. These should be in the region of serveral hundred volts. One word of advise when taking meaurements around high voltage circuits, KEEP ONE HAND IN YOUR POCKET. you will then be more likely to survive this exercise. If all appears good up to this point, locate the master volume control, turn it up to maximum. With a screw driver

and using only one hand touch the terminals of the control. Do you now hear a loud buzz from the speaker if yes the the output stage is ok, if not the the fault lies within the output stage.

When you have carried out all of the above, post a detailed report of your findings and we will continue with our diagnosis.

Good luck and be safe. Regards from Vintie

Sep 18, 2013 | Peavey Audio Players & Recorders

1 Answer

Laptop is turning on and off


Remove the AC adapter (Charger)

PROPER method is to disconnect the power cord of the AC adapter, from power; THEN unplug the AC adapter from the laptop.

Same thing in reverse to plug the AC adapter back in.
AC adapter is plugged into laptop, THEN AC adapter is plugged into power.

Unplugging the AC adapter from the laptop, while being plugged into power; can cause a Voltage Spike.

You may get away with it for years, and several laptops; and have no problems.

However it only takes ONCE, to fry out the SMD fuses, Multi-Layer Ceramic Capacitors, and Power MOSFET's, on the laptop motherboard's DC to DC circuit.

Jus sayin'.

Moving on........

AC adapter removed, remove the Battery.
Press the Power On button in, and hold in for a count of 10 seconds.
Let go.
Do this procedure 2 more times.

(Draining residual power)

Reinstall the Battery. Attach the AC adapter, plug AC adapter into power. Let the Battery charge 24 hours.
Then turn the laptop on, and tell me what happened.

Regards,
joecoolvette

Mar 15, 2013 | HP Pavilion Computers & Internet

1 Answer

AC adapter power connection LED blinks but not charging


This suggests to me that you need to check out the AC adapter, and see if there is an intermittent short. In otherwords a break in the wires.

AC adapter unplugged from laptop, and power, remove the AC power cord from the body of the AC adapter.

Use a multimeter set to OHM's, (1K), and connect the Positive (Red) probe lead to one of the flat bladed prongs, in the power plug that plugs into the surge protector.

Touch the Negative (Black) probe lead to one of the holes in the plug, that goes into the AC adapter 'body'.
Keep going from hole to hole, until you get a reading.
Now have an assistant gently wiggle the power cable, and see if you get an intermittent reading.

Do the same for the other plug's flat bladed prong.
Intermittent reading means replace the power cable, or if more feasible, the entire AC adapter.

Power cable proves to be fine, move on.
Plug the power cable back into the AC adapter. Plug the AC adapter into power.
Using a multimeter set to DC Voltage, touch the Positive (Red) probe lead of the multimeter, to the center hole of the plug that goes into the laptop.
(If just a symbol, the DC Voltage symbol is a dotted line over a solid line)

The Negative (Black) probe lead, touches the outside cylindrical metal shell, of the plug.
Have an assistant gently wiggle the cable, and see if there is an intermittent reading on the multimeter.
(Reading should be 18.5 Volts DC)

[There are Analog multimeters which have a scale, and a needle, and Digital multimeters that just have a digital readout.
If using an Analog multimeter the needle will drop towards 0.
If using a Digital multimeter the readout will drop to smaller numbers, or 0 ]

AC adapter checks out? Go on.

The port on your laptop where the AC adapter plugs in, is the DC Power Jack.
AC adapter unplugged from laptop, Battery removed.
Take a pencil, and gently use the eraser end to see if you can wiggle, the center pin of the DC Power Jack.

ANY perceptible movement means a problem with the DC Power Jack.
The GOOD news is that the DC Power Jack, is NOT soldered directly to the motherboard.

It slides down in a Channel on the outside edge of the Base Enclosure, and has a wiring harness coming from it.
The end of the wiring harness has a plug, that plugs into the motherboard.

The HP part number for this DC Power Harness is HP 600630-001

A) http://www.dectrader.com/600630-001-New-HP-DC-input-power-socket-connector-With-cable.html#.UD0_w6B0k9Q

B) http://www.ebay.com/itm/HP-Compaq-600630-001-DC-Power-Input-Jack-Cable-CQ42-G42-Notebook-Series-/180932154005?_trksid=p4340.m1850&_trkparms=aid%3D222002%26algo%3DSIC.FIT%26ao%3D1%26asc%3D11%26meid%3D1653940420718665976%26pid%3D100011%26prg%3D1005%26rk%3D1%26

This is a link to a free Service Manual from HP Support,

http://h10032.www1.hp.com/ctg/Manual/c02627955.pdf

Page 73 is for the Power Connector Cable.

No damage to the DC Power Jack, and the harness is not slightly unplugged?
Now you have real problems.

You have a bad Power MOSFET,

A) MOSFET:

http://en.wikipedia.org/wiki/MOSFET

B) Power MOSFET:

http://en.wikipedia.org/wiki/Power_MOSFET

C) http://mayohardware.blogspot.com/2010/04/important-parts-on-dv6000-and-dv9000.html

However it doesn't take a rocket scientist to replace. (Sorry Gort)
These SMD's use a J-lead contact. Simple unsoldering, and soldering.

(Better be fast though as you don't want to overheat a power transistor. Better be good, because you don't want any cold solder joints)

For additional questions please post in a Comment.
Regards,
joecoolvette

Aug 28, 2012 | HP Computers & Internet

3 Answers

HP printer AC power adaptor 0950-4399


I want to purchace new HP printer AC power adaptor 0950-4399 from mumbai where shall i contact

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