http://www.cleverscampcamp.com/power-board/
Epson LX300 printer repair, No power and can not print-defective Max232ic
Intermittent no power was the denunciation of the Epson LX 300, the printer. As usual, the main suspect was the power on / off. After removing the power board from the printer, I could clearly see a set Dry to the pin switch mode power transformer. This was the cause of the problem of the printer. There was no loose connection or dry joints on the other.
The cleaning solution with the thin and fresh soldering application solved the energy problem is not intermittent. In this article, I want you to know that no all feeding problems should be caused by the main components burned. A loose joints, dry joints, open circuit resistance in ohms esr high capacitor electrolyte could cause intermittent no power or the power they have none.
Troubleshooting appropriate techniques and following a procedure While electronic failures usually easily resolved. Another thing I want to share with you is that the power board is using a dual photo coupler (optoisolator) NEC PS2561-2 IC. There are two separate optoisolator ic integrated into a single package. If you are the master of Philips ECG replacement guide, you can find the internal diagram of this type integrated circuits. Once you locate the pinouts, you could actually test it with the analog multimeter. Optoisolator about testing, could refer to my website.
Sometimes there is more than a few problems you need to repair. In the former case, the power after the printer can not print at all. It seems that there was no signal entering the IC from the CPU. The proof of the printer itself works perfectly fine. For your information, if this kind of problem happens another brand of printer, troubleshooting method is the same. First, the chip will be in communication or a security chip. In this printer, the main suspect was the Maxim MAX232CWE RS232 Transceivers multichannel ic.
Solder the IC out was not a problem with this type SMD IC. After replacing ic for a new printer works perfectly. Remember, if you are the solution of problems of Epson LX 300 Printer or any other model, first check the printer cable and then communication or buffer ic.
About the Author
Check out the two links below. You will be pleasantly surprised to find out that LCD and Electronic Repairs are so Easy and Highly Profitable for even a novice. You can learn the repairing secrets easily.
Find out How to Repair Any LCD Monitor – It is a breeze!
Learn the Secrets of Testing Electronic Components.
MATTRACKS Powerboard Demo Video
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