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Extra resources for Basic Electronic Troubleshooting for Biomedical Technicians
Example text
Numeric Value 3. Multiplier band (1 ox) Band 1 =Blue= 6 Band 2 = Brown= 1 Band 3 = Red= 1 x 10 2 Resistor value= 61 x 10 2 = 6100 Band 4 =Gold=± 5% tolerance Therefore, resistor value is 57950 - 64050 Example 2 Tolerance Codes (Band 4) 5. Reliability= Mil Std (usually not present) (Plain) Brown=± 20% Silver = ± 10% Gold=± 5% *Quality resistors ± 1% stamped on resistor (Example 1, 2, 3, ... 17 megaohms. Reference "Ground" The term "ground" is probably the most misused and misunderstood term in electronics nomenclature.
Check for physical damage. If nothing looks unusual upon physical inspection, look at the maintenance history of the device. Many times this can save hours of frustrating troubleshooting. If a failure occurred once, it is likely to occur again. Call the original equipment manufacturer (OEM) and ask for technical support. Many times if you describe the symptoms of the failure they can quickly have you 50 Basic Electronic Troubleshooting for Biomedical Technicians directed towards the problem. Remember, the technician at the other end of the phone can make suggestions but you have knowledge of electronics also.
Most of the appliances in your home utilize AC current and voltage. Most medical devices utilize DC current and voltage. Electric motors will be discussed in detail in Troubleshooting Electronic Motors. Kirchoff's Laws Voltage Law The sum of the voltage drops in a closed circuit is zero. " This concept is important to understand in electronics. Current Law According to Kirchoff's Current Law, the total amount of current entering a conductor must be equal to the total amount of current coming out of a conductor.