Flyback Transformer-How to locate the ABL line

Written by Jestine Yong

Whenever there is a complaint about monitor contrast problem i will check onrepparttar flyback transformer ABL (automatic blanking limiter) circuit. Sometimes a weak picture tube might caused contrast problem. Ifrepparttar 148296 picture tube is good, i will go straight torepparttar 148297 contrast circuit. The question is how do we find whererepparttar 148298 contrast circuit located? Simple, if you have a datasheet forrepparttar 148299 video pre- amplifier ic, definitely you can findrepparttar 148300 contrast pin. For LM1203N video pre-amp icrepparttar 148301 contrast pin is located at pin 12. Replace this ic or trace from this circuit to findrepparttar 148302 cause ofrepparttar 148303 contrast problem.

From experienced, usually capacitors shorted and resistor turned into high ohms wererepparttar 148304 caused ofrepparttar 148305 problem. A video pre-amplifier can also be defective. To confirm whether is circuit or ic problem, just solder outrepparttar 148306 contrast pin and switch onrepparttar 148307 monitor. If repparttar 148308 monitor display normal picture (contrast ok) then suspectrepparttar 148309 abl line circuit. If it remainrepparttar 148310 same (dim contrast) replacerepparttar 148311 video pre-amp will usually solverepparttar 148312 problem.

The contrast signal came from one ofrepparttar 148313 pin (leg) of a flyback transformer which we called it as abl pin. Many technicians haverepparttar 148314 difficulty to tracerepparttar 148315 abl pin because usually a flyback transformer consist of around 10 pins. Some pins are B+, GROUND, AFC, ABL, X-RAY PROTECT, VCC, to HOT, HEATER, horizontal centering and etc. But there is one and simple way that i'm gone to show you how to locaterepparttar 148316 abl pin. Use two analog multimeters set to x10kohm range. Connect it in series (+ probe to - probe) and measurerepparttar 148317 flyback transformer from anode (the red cap) to all ofrepparttar 148318 pins underrepparttar 148319 flyback. You have to desolder allrepparttar 148320 pin or just removerepparttar 148321 flyback fromrepparttar 148322 mainboard in order to get an accurate reading.

VoIP Explained

Written by Andrew Taub

Voice over Internet Protocol or VoIP, is one of today's hottest and most confusing new technologies. Because of allrepparttar confusion and complexity, Teleco has written this page to inform and educate you. We hope you find it helpful. VoIP consists of 2 major technologies....

Making Calls Overrepparttar 147682 Internet

This isrepparttar 147683 most common use of VoIP. It is also called VoIP lines or trunks. If you have a high speed internet connection, like cable modem, DSL, or T1, you can use your high speed connection to make phone calls onrepparttar 147684 internet. There are many companies like Vonage, Lingo, and VoiceWing (Verizon) that offer VoIP lines. Cable companies also offer VoIP lines, but only if you have their cable modem service. So, to boil it down, instead of getting your dial tone from Verizon overrepparttar 147685 traditional phone network, you get your dial done from your internet company. Any phone system made (even an old one) can take advantage of VoIP lines. You do not need an IP based (IP PBX) or even IP compatible phone system.

The advantage of VoIP lines are:

Lower Bills. Usually you pay a flat monthly rate and all your calls inrepparttar 147686 USA and Canada are free You can take your number with you. If you move aroundrepparttar 147687 corner or acrossrepparttar 147688 country with VoIP you can keep your existing phone number even if you move to a different area code. Multiple area codes. You can get phone numbers from different area codes or even overseas numbers. Portability. You can moverepparttar 147689 VoIP router with you and take your service easily with you. You can even set it up to use your laptop and a WiFi connections to make calls from anywhere you can get high speed internet access. Features. VoIP lines come with Caller ID, Call Forwarding, and lots of other great features. The problems with VoIP lines are:

Quality is not as good as traditional phone service, but it's close and getting better allrepparttar 147690 time. Set up can be very challenging. Depending on how fast your internet connection is, it may be possible to make several calls atrepparttar 147691 same time overrepparttar 147692 internet. However,repparttar 147693 more calls you make at oncerepparttar 147694 slower your internet connection will be andrepparttar 147695 poorerrepparttar 147696 sound quality of your calls will be. Faxes, modem, and alarm systems don't work well over VoIP lines. Sometimes they won't work at all. If you need a lot of lines,repparttar 147697 cost ofrepparttar 147698 high speed internet connection may outweighrepparttar 147699 savings. There are some minor technical issue using VoIP lines and Automated Attendants and Voice Mail systems. If your internet access goes down, all your phone lines go down too. VoIP lines normally don't work ifrepparttar 147700 power does out, but you can set up back up batteries. Right nowrepparttar 147701 Government does not tax VoIP service. If that changes VoIP may not be price effective anymore. Connection Remote Workers or Remote Offices....Voice over IP Stations.

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