In this new article, we will now be talking about the use of the Optoisolator IC which is commonly used in the feedback circuit on a variety of power supplies that are autovolt on my opinion. Most power supplies like DVD players and Chargers that I have repair using an Optoisolator IC with a value of PIC817, this power supply is autovolt, which means it can be plugged either on a 220 volts or 110 volts supply source.
According to Sirkevin,... [ Continue reading... ]
Here are some of the useful information that we must know if we want to learn about TV Repair, but before this, you must also have the knowledge about the electronics components and the symbols that we see when dealing a schematic diagrams and printed on the circuit boards. You must learn the basic functions of the Resistors, Diodes and other semiconductor components that are available on electronics circuits. For more information about the... [ Continue reading... ]
Today, I am repairing a POS unit which is used on the transaction on the sale in the Mall I am working.
The problem of this unit is that having a No Display Problem. I checked the unit and found out that there are a lot of electrolytic capacitors that get bulgy on its top which is a sign that it is defective. So I take out from the circuits those two big electrolytic capacitors for checking. You can also replaced directly all... [ Continue reading... ]
The best way of testing a capacitor will depends to the type of capacitor you are going to test. Electrolytic capacitors that are leaky are not so common. You can take each capacitor out on the circuit and test it using a cap checker or using your VOM, but in-circuit testing of the capacitor is quicker and save a lot of time.
Do a visual observation and inspection to the capacitor and see if there are any electrolytic capacitor are bulging... [ Continue reading... ]
These are the common display or deflection problem that you can encounter when troubleshooting a CRT TV and Monitors. You can print this image to serves as your reference when you are repairing a deflection or display problems of a CRT TV and Monitors. For beginners who are new in this field, they don't know how it looks like a Pincushion or Keystone Distortion problem, that is the reason why they have difficulty in looking the fix... [ Continue reading... ]
Early this morning, I've got a call from Jollibee ICM regarding to the UPS on one of their POS because it is not turning on. So I go to there place and checked he unit and I've decided to pull out their UPS to it to IT office to check for the possible cause of the problem.
When I arrive in the office, I checked the unit immediately and I've found out that the fuse is blown. So I check the circuit board for the possible cause of blowing the... [ Continue reading... ]
One of my co-worker brought his dead power supply. This is a power supply of a slim type desktop computer. The history of this unit, it is a package from abroad and it is rated as 220 voltage source. He plugged the unit to the outlet and shocked when it sparks and the unit is not turning on. So he brings the unit here in the office for repair.
I checked the unit and I found out that the fuse is... [ Continue reading... ]
Recently, I got this unit from my cousin for repair. It is a Sharp Component System with a model number CD-BA3100H having an er-ap00 Error.
Before the Repair
I have searched to the internet for some possible solutions for this kind of error but I can't find any solution regarding in this error. So I try to repair this unit. I have opened it and try to isolate the problem. This unit have two Power Amplifier, I hang up the Power Amp IC one... [ Continue reading... ]
This is a project for those who want to build their very own Automatic Battery Charger. This is a project made by one of the member of Elab Forum, duc_tech. But as a reminder, this circuit don't have a current limiter which means this charger is good to use only on a known good battery but not on a battery that have defects like having a short or open plates which will cause the diodes, switching Thyristor and transformer to heat easily.... [ Continue reading... ]
