Just FYI – capacitors are measured in microfarads (μF), not "MU"s.
The Greek letter μ indicates “micro” in this case – although since that letter is hard to type unless you actually have a Greek keyboard, a lowercase “u” is also acceptable; i.e. “470uF”.
(You will also see smaller capacitors given in pF, or picofarads. Rarely, you might see a capacitor written in “nF”, or nanofarads – i.e. 1nF rather than 1000pF or 0.001uF – but it’s not common, at least not in my experience. Really old radio schematics might also list them as μμF – micro-microfarads – rather than pF, but that’s pretty obsolete nomenclature and no one’s used that since the 1950s or so.
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Zener diodes can be tested by measuring the voltage across them with a voltmeter, with the red (positive) probe on the cathode side and the black (negative) probe on the anode. The voltage across it should be close to what it is rated for. To get the most accurate result, it should be removed from the board and tested out of the circuit, if possible. This page has a good technique:
There’s also a very basic technique for testing transistors on that same site:
Although if you’re serious about electronics work, you might want to invest in a proper transistor tester. They’re not all that expensive, at least not here in the USA. (I admit I don’t know anything about the pricing for such things in Poland, though.
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