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f-alpha.net » Electronics » Electronics Lab » Troubleshooting » Troubleshooting 4 - Components

Troubleshooting 4 - Problems with ComponentsBauteile

Measure Components

Be careful measuring components while they are still part of the circuit!

Since the component is still connected to the circuit, the measured result can be distorted. You might want to isolate the component from the circuit.

With the large variety of components, there is no complete list of components and possible problems. However, there are the "usual suspects"...

Resistor

Resistors are determined by color codes. This can create confusion...

Different resistors. (Enlarge)

Capacitor

For some capacitors you need to pay attention to the polarity. This applies mainly to electrolytic capacitors.

The cathode (negative) is marked by a printed label...

Different electrolytic capacitors. (Enlarge)

Diode

A diode must be connected in the forward direction. Therefore, the cathode is marked by a printed bar.

Note: A Zener diode is connected in reverse direction!

Different diodes. (Enlarge)

LED

A LED needs to be connected in the forward direction. The housing is marked at the cathode (mostly flattened).

Different LEDs. (Enlarge)

Transistor

You need to compare the pin asignement of a transistor with the information in the datasheet!

If you suspect that the transistor is damaged, remove it from the circuit and check it in a test circuit.

Different transistors. (Enlarge)

Integrated Circuit

You need to compare the pin asignement and type of the integrated circuit with the information in the datasheet!

Are all inputs properly connected, possibly with pull-up or pull-down resistors?

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