Computer Hardware

Let\\\'s get technical…

Intermittent power was not denouncing the Epson LX 300. As usual, the prime suspect was the power on / off. After eliminating the power of board management of the printer, I could clearly see a dry joint on pin power transformer switching. This was the cause of the printer. There were no connections loose or dry joints on the other side.

Cleaning solution with finer and applied fresh solder solved the problem only intermittent power. In this article I want you to know that not all problems can be the major component caused by burns. A loose connections, joints, dry, resistance open-circuit, resistance to elevated ESR in the electrolytic capacitor can cause the power is intermittent or no power at all.

Troubleshooting with the proper techniques and use the correct procedure normally eliminate electronic defects easily. Another thing I want to share with card you are feeding is to use a dual photo coupler (optocouplers) NEC PS2561-2 CI. There are two separate OPTOISOLATOR ic and integrated into a single package. If you replace Philips Semiconductor teacher guide book, you can find the internal distribution of this type of IC. Once you've found the pinout, you really could test with the multimeter analog. Optocouplers about testing, you can return to my site.

Sometimes there is more than a few problems need repair. In the previous case, after turning on the printer, printing CanÂ't all. There seems no signal was coming into the CPU IC. The self-test of the printer works perfectly. For your information if this kind of problem occurring in other brand of printer, troubleshooting method is the same. First, address the communications chip or buffer chip. In this printer, the main suspect was a multiplicity of channels MAX232CWE Maxim RS232 Transceiver IC.

Solder the ic out has not been a problem with this type SMD LED. After the substitution of a new printer works perfectly IC. Remember, if you try to resolve the Epson LX 300 or other model first check the cable the printer, then the communication or a buffer IC.

Jestine Yong is a electronic repairer and a writer, for more printer repair tips, please visit his website at http://www.electronicrepairguide.com now.

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