What is a crystal ? And how to test it.

Written by Jestine Yong

Continued from page 1

(b) Frequency Counter Frequency Counter can be use to checkrepparttar frequency ofrepparttar 138977 crystal. The reading must be taken whenrepparttar 138978 equipment power is switch “on”. Placerepparttar 138979 probe of frequency counter torepparttar 138980 crystal pin and readrepparttar 138981 measurement. Be sure that your frequency counter meter hasrepparttar 138982 range that is higher thanrepparttar 138983 crystal frequency you are measuring.

(c) Crystal Checker With this method, usuallyrepparttar 138984 crystal is placed inrepparttar 138985 feedback network of a transistor oscillator. If it oscillates andrepparttar 138986 LED is lighten up, this mean thatrepparttar 138987 crystal is working. Ifrepparttar 138988 crystal doesn’t work,repparttar 138989 LED stays off. Instead of using LED, some other crystal checker uses a panel meter to indicate ifrepparttar 138990 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 printer

Written by Jestine Yong

Continued from page 1
Firstly, removerepparttar rubber pad fromrepparttar 138976 holder. Be careful while you're removing because you might tornrepparttar 138977 rubber into pieces. Secondly, cleanrepparttar 138978 holder to prevent any dirt or glue sticking on it. After that, apply a small amount of super glue that is just enough to coverrepparttar 138979 full surface ofrepparttar 138980 rubber pad. Finally, reversedrepparttar 138981 rubber pad and stick it back torepparttar 138982 holder. Please ensure thatrepparttar 138983 surface should face upward before you stickrepparttar 138984 rubber pad. It will work as good as a new one. *Note: If you are servicingrepparttar 138985 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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