Important Note Never attempt to repair circuit boards in appliances or HVAC systems unless you are directly supervised by a licensed professional engineer and doing so under approved ISO and UL processes. What Can Happen to a Relay Control Circuit if you Replace an RT334012 with an OZ-SS-112LM1 These results are based on a standard […]
Important Note on Board Repair Never attempt to repair circuit boards in appliances or HVAC systems unless you are directly supervised by a professional engineer and doing so under approved ISO and UL processes. What is an Electrically Equivalent Replacement Relay? Some Appliance and HVAC Technicians perform board-level repairs and often replace relays. Their replacement […]
Build a microwave diode tester that shows a green light for forward bias. It uses 18V to ensure enough voltage to forward bias the diode. This tester can also be used for biasing zener diodes and semiconductor junctions in general. In this article, a detailed description and instructions are provided, along with a parts list, […]
How do you make most every customer a happy customer with almost no extra effort? How do you build instant trust from your customer? How do you get repeat-business, referrals, and positive reviews from almost every customer? How do you turn naturally suspicious, untrusting customers into the kind of customer you want? Steer their perceptions […]
Electricity for Appliance and HVAC Technicians. What do they Need to Know? Appliance and HVAC Technicians will inevitably encounter electrical problems that they must troubleshoot. In order to effectively diagnose these circuits, Technicians must understand some fundamental concepts. This blog describes five bare-minimum electrical rules that once understood, will help better position Technicians for the […]
What Resistors, Capacitors, Inductors, Diodes, and Transistors do. If you work on anything electrical or electronic, you’ve seen these components. What are they used for though – and how do they work? This blog gives you the short answers. What does a resistor do? A resistor limits current flow. It is analogous to a bottleneck […]
What is Pattern Recognition as it Applies to the Service Industry? Pattern Recognition, or “PR”, as it applies to the appliance and HVAC repair industry, is simply noticing similarities between symptoms and causes. If 7 out of 10 times, an electric dryer is found to have “no heat”, and the element is open, PR will […]
About the Tech Circuit™ The Tech Circuit’s mission is to continuously improve and maintain the Field Technician’s electrical diagnostics aptitude. The need to provide electrical and electronic related diagnostic solutions in the field has become increasingly unavoidable. Developing an innate understanding of how electricity works greatly empowers you when encountering such scenarios. Below is a […]
Why do Motors have Inrush Current? Understanding how things work greatly impowers you when troubleshooting in the field. Let’s add a little motor theory to that knowledge. Why is Startup Current so High? Why is a single-phase induction motor’s starting current so high? You might just call it inrush current. It’s more complicated than that […]
Intro It’s important to understand how electricity behaves at its most fundamental level. There are certain unwavering truths about it that will exist wherever and whenever you encounter it. Some of these root-level aspects that are relevant to field technicians are summarized in the below table and further explained in the following text. Must-know Fundamentals […]