Lcd Replacement
Intermittent no power was the complaint of the Epson LX 300 Printer. As usual, the main suspect was the power on / off switch. After removing the power board from the printer, I could clearly see a cold joint at the pin processor power supplies. Was the problem of the printer. There were no other loose connection or dry joints on the other.
Clean with thinner solution and applied fresh solder solved the problem of intermittent no power. In this article, I want you to know that all power problems must be caused by principal component burn. A loose connections, coupled with dry, open circuit resistance, ohms esr high capacitor electrolyte can cause intermittent no power or no power.
Troubleshooting with the right techniques and using a procedure normally good solution electronic defects easily. Another thing I want to share with you is that the power board is to use a dual photo coupler (optocouplers) NEC PS2561-2 IC. There are two separate IC optocouplers, built in a single package. If you master Philips ECG replacement guide, you can find the pattern this type of internal IC. Once you find the pin, you could really test it with your analog multimeter. About how to test optocouplers, you can refer to my website.
Sometimes there is more than a few problems that you need to repair. In the case above, the power after the printer, can not print at all. It seems that there was no signal entering the IC CPU. The printer self-test works perfectly. For your information If such problems happening in other brands of printer, the troubleshooting method is the same. I will first look at communication chip or buffer chip. In this printer, the main suspect was the Maxim Max232cwe multi channel RS232 transceiver ic.
Solder the IC has star not been a problem in this type SMD IC. After replacing with a new ic printer works perfectly. Remember, if you solve the LX 300 Epson or any other model, first check the printer cable and the communication or 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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