How To Choose a Great Camera PhoneWritten by Syd Johnson
List of Features Camera phones are handy, and they offer most features of any type of cell phone on market. The list of features available on a camera phone is truly astounding for such a small product. Here is a sample list:Internet access, better color resolution, improved sound quality, multi media messaging (MMS), zoom in/out, video recording capabilities (short clips, no movies), speaker phones, FM radio, MP3 players … and all other capabilities you associate with great cell phones. Every major cell phone manufacturer has a camera phone on market. While some manufacturers say their camera phones are latest and greatest, all camera phones have limitations when compared to regular cameras. If you have dreams of taking pictures on fly and sending them over to Grandma's house, compare, compare, and then compare features again before you purchase your camera phone. Picture Quality Pictures on camera phones can be fuzzy, garbled or weird. Camera phones don’t have same capacity for clarity and space as your average Digital Camera. Check specs on your phone to see resolution. On newer models, 640 X 480 pixels is norm. In contrast, Digital Cameras are rated according to millions of pixels. Make sure you have enough space to store a few pictures. You should know how many pictures you can keep on your phone at any one time. Usually, around 30 small pictures are possible. Charge In cell phone industry, every new feature seems to have a new charge. Be aware of amount of time it takes to send a picture from your phone. Check your service agreement to see if time it takes to send a picture via web will be deducted from your minutes, or if a monthly fee is required to send pictures from your camera phone. Under best plans, you pay a monthly fee to send unlimited amounts of pictures.
| | Flyback Transformer-How to locate the ABL lineWritten by Jestine Yong
Whenever there is a complaint about monitor contrast problem i will check on flyback transformer ABL (automatic blanking limiter) circuit. Sometimes a weak picture tube might caused contrast problem. If picture tube is good, i will go straight to contrast circuit. The question is how do we find where contrast circuit located? Simple, if you have a datasheet for video pre- amplifier ic, definitely you can find contrast pin. For LM1203N video pre-amp ic contrast pin is located at pin 12. Replace this ic or trace from this circuit to find cause of contrast problem.From experienced, usually capacitors shorted and resistor turned into high ohms were caused of problem. A video pre-amplifier can also be defective. To confirm whether is circuit or ic problem, just solder out contrast pin and switch on monitor. If monitor display normal picture (contrast ok) then suspect abl line circuit. If it remain same (dim contrast) replace video pre-amp will usually solve problem. The contrast signal came from one of pin (leg) of a flyback transformer which we called it as abl pin. Many technicians have difficulty to trace 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 locate abl pin. Use two analog multimeters set to x10kohm range. Connect it in series (+ probe to - probe) and measure flyback transformer from anode (the red cap) to all of pins under flyback. You have to desolder all pin or just remove flyback from mainboard in order to get an accurate reading.
|
