What is a crystal ? And how to test it.

Written by Jestine Yong

Crystal are use to keeprepparttar frequency ofrepparttar 138977 clock from drifting. Ifrepparttar 138978 signal from this clock stops, or is weak, orrepparttar 138979 pulses begin to vary,repparttar 138980 electronic equipments might show intermittent faults or might stop altogether. The microprocessor pins that holdrepparttar 138981 crystal are usually called OSC IN and OSC OUT as shown in Figure 1 andrepparttar 138982 frequency is marked onrepparttar 138983 crystal. Typical examples of crystal oscillator frequency are 3.58MHZ, 4MHZ, 8MHZ, 24MHZ etc.

Testing Crystal Crystals are quite fragile components because of their construction. Unlike a resistor or capacitor, if you drop one onrepparttar 138984 ground from a decent height, its 50-50 bet whether it will work again. Testingrepparttar 138985 crystal is not a breeze either. You cannot just take out your trusty multimeter and plugrepparttar 138986 crystal in it. In fact, there are three right ways to test a crystal: -

(a) Using Oscilloscope A crystal produces a sine wave when excited. It is appropriate then, to see a waveform representative of a sine wave onrepparttar 138987 clock pins. Ifrepparttar 138988 clock is not functioning properly, replacerepparttar 138989 crystal. In most cases this should solverepparttar 138990 problem since microprocessors are usually very reliable. Checkrepparttar 138991 crystal with power on.

How to solve multiple paper loading problem in HP5L and HP6L laser printer

Written by Jestine Yong

Have you ever encountered beforerepparttar problem of having multiple paper loading in your HP LaserJet 5L and 6L? Do you know that this is caused by a defective separation pad where it's rubber has worn out. The function of separation pad is to control or allow paper to go through it, one at a time. If it spoilt, few sheets of paper will be pulled instead of one whenever you send a printer command. This sometimes will causedrepparttar 138976 papers to jammed up. Forrepparttar 138977 worst case, it will spoil your heating/fuser sleeve. The price of a heating element is more expensive than a separation pad. There is one temporary way that you can use to solverepparttar 138978 problem stated without buying a new separation pad. The process of removing and changingrepparttar 138979 separation pad is just easy and fast.

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