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Hi Darren,
Good job paying attention!
We decided to remove that second, parenthetical mention, as it wasn’t really important to the point.
AC current does change direction 120 times per second, but completes a full cycle 60 times per second. That’s where the two numbers can come from.
😀
Good question.
Context is important!
In appliance repair, we are interested in power that can drive a load so it will do work. This requires sustained current, which can only happen in a closed circuit with a conductor (wire).
Things like lightning (or even the spark in a spark module on a gas cooktop) are momentary discharges that happen when there is a large voltage difference.
Do you see the difference?
I answered the question that you asked.
First of all, you’ll know based on the system that you’re dealing with (DSI vs. HSI). You’ll know this by looking at the schematic, which you will do before you go on the service call (right??).
But there are example photos in the videos as well.
They are two different types of valves and function differently. The only thing they have in common is they both convey gas.
The gas valve in an HSI has a bimetal and a heater – no solenoid.
Rewatch the portions of these videos on the valves:
DSI system (solenoid valve)
https://my.mastersamuraitech.com/module-9/cs5-compare-measurements-results-specifications/Hot Surface Ignition (“safety” valve)
https://my.mastersamuraitech.com/module-10/cs6-schematic-review-initial-findings/(I moved your reply to your original topic)
Here’s the original problem statement:
When you walk up to the range you find that the left-front hot surface indicator light is on even though the surface is cold. That’s pretty much all the verification you need, but you go ahead and turn each burner on momentarily until the indicator lights come on, then turn them off. Sure enough, the left-front element’s light remains on while all the other ones turn off once their respective element cools down.
So, the LOI is one of the 4 lights that are each connected with a burner – the one for the LF burner.
There is also a single hot surface light that apparently comes on when the glass surface is above 150 degrees (according to the info on page 1 of the manual that we gave you) but is not connected to any particular burner.
See if this Forum thread helps you:
https://my.mastersamuraitech.com/appliance-repair-course-support/student-forums/topic/cs7/
The second link I gave you mentions doing that.
For the quiz question, we tell you that you’re measuring voltage across the switch. This means you are able to get the measurement without any other loads being in between your two meter probes. Just go with that simple scenario to determine the answer.
In real life, you may or may not have “EEPs” available for particular components, but that’s a separate consideration.
This question is making sure you understand what a voltage reading is telling you. Reading source voltage across a switch means that the switch is open.
Right. When a switch is closed, will you have a voltage difference across it?
You can create a cheater cord – described here:
But watch this. Easier to have a generic start device for testing.
Which module/unit is this from?
Is a hi-limit a switch or a load?
It’s best to think of a load having a specific fault, and not just “bad”. It will help your thinking. Look at the schematic again. If the drain pump fails open, then neutral will not be fed through the drain pump, as shown in the video (about halfway through). In that event, the two measurement points will be at the same electrical potential.
We’re happy to help, but please answer the question I sent you via email first
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