Epson Lx300 Printer Repair-No Power And Can’t Print -Max232ic Faulty

No power was the complaint of intermittent epson printer LX 300 printer.As usual, the main suspect of on / off-board power supply was switch.After to the printer, I could clearly see a dry joint on pin-mode transformer. Like you can not blink, this was the cause of the printer problem.There was a loose connection or other dry joints part.Cleaning solve with other dilution solution and applied fresh solder problem.In this article, I know they would not burn any problem with the power supply of the main components. The loose joints, dry joints, open circuit temporarily high ohms ESR electrolytic capacitors or power can not solve all.Troubleshooting have been caused with the right techniques and the use of a good method for controlling the electronic error easily.Another I share with you that the card with a dual-coupler (opto) NEC PS2561-2 ic.There two separate optocoupler in a single IC package is integrated. If you master the Philips ECG replacement guide, you can change the internal representation of ic.Once dowel pins, could actually prove with multimeter.About than analog optocoupler, the test can be found on my website. Sometimes there is more than a few problems that repair.In previous case, no to, after turning on the printer print all.It there seems no evidence that test the CPU, the printer must be IC.The okay.For information works is if these problems on other brands of printers, the method of solution of problems same.I first look at the communications chip or buffer chip.In this printer appear perfect, was the prime suspect of the multi-channel RS232 transceiver Maxim MAX232CWE ic.Solder the IC was not a problem with this type of substitution by a new MDS ic.After beautifully.Remember IC, the printer when the box with the troubleshooting, the Epson LX 300 or any other model, first connect the printer and the release of IC or buffer.