What is a crystal ? And how to test it.Written by Jestine Yong
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(b) Frequency Counter Frequency Counter can be use to check frequency of crystal. The reading must be taken when equipment power is switch “on”. Place probe of frequency counter to crystal pin and read measurement. Be sure that your frequency counter meter has range that is higher than crystal frequency you are measuring. (c) Crystal Checker With this method, usually crystal is placed in feedback network of a transistor oscillator. If it oscillates and LED is lighten up, this mean that crystal is working. If crystal doesn’t work, LED stays off. Instead of using LED, some other crystal checker uses a panel meter to indicate if crystal is working or not.
Jestine Yong is a electronic repairer and a writer. For more repair infromation, please visit http://www.noahtec.com
| | How to solve multiple paper loading problem in HP5L and HP6L laser printerWritten by Jestine Yong
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Firstly, remove rubber pad from holder. Be careful while you're removing because you might torn rubber into pieces. Secondly, clean holder to prevent any dirt or glue sticking on it. After that, apply a small amount of super glue that is just enough to cover full surface of rubber pad. Finally, reversed rubber pad and stick it back to holder. Please ensure that surface should face upward before you stick rubber pad. It will work as good as a new one. *Note: If you are servicing printer for your customer, I'll recommend you to replace a new one for them unless you’re maintaining and servicing your own laser printer.
Jestine Yong is a electronic repairer and a writer. For more repair information, please visit http://www.noahtec.com
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