Tip & How-To about Saws

Table Saws not Powering Up

When a table saw won't power up there are various causes of failure, but troubleshooting should be done in a methodical order, the main thing though is to check the obvious first!

Equipment Needed:

  1. Continuity meter or multimeter to trace continuity from the plug to the motor
  2. A non-contact voltage detector (optional). These devices glow when the tip is held close to a live cable
Troubleshooting:

Remember to avoid shock, disconnect the tool from the mains supply before troubleshooting!
  • It may be obvious but ensure the socket outlet isn't faulty, try the tool in another outlet to see if it works.
  • Check whether the overload circuit breaker if fitted on the tool has activated. This happens e.g. on a table saw when the motor is stalled. To reset you need to press a button. The breaker may need a couple of minutes to cool down before resetting
  • If plug is rewireable check for loose screws at plug pin terminals, loose or blown fuses etc.
  • A common cause of failure especially with drills and other hand held tools is one or more broken wires in the power flex caused by metal fatigue in the cable (like when you break a paper clip by bending it backwards and forwards) , this usually happens where the cord leaves the plug or where the cord enters the tool. If you have a non-contact voltage detector, you can use it to trace the break from the plug to the tool. Plug in the tool and hold the tip of the detector at the plug, it will glow here but as it is moved down along the flex it will stop glowing after the break (If the break is in the live core of the cable)
  • Sometimes it is possible to detect where a break is in a flex by stretching it, the flex will narrow in the region of the break
  • If you still can't trace the fault, unplug the tool. Open it. Check the continuity from each pin of the plug to the switch in the tool.
  • A faulty on / off switch can prevent the tool from working. Use the continuity tester to check this
  • Loose spade terminals on switches may cause intermittent operation
  • Tools with green and red start and stop buttons may have a faulty relay
  • The brushes in the motor may have worn down
  • The armature or field coils of motor may have gone open circuit. The field coils can be checked with the continuity meter

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1 Answer

my microwave has stop heating up food. What is the cause?


There are several things that can cause this:
1. Bad high power diode failure (most common and usually causes a loud humming sound when it fails initially then never heats again)
2. Bad capacitor (open or shorted)
3. Stuck Magnetron oscillator (Makes a loud humming sound when the Diode and capacitor are known to be good.) / Magnetorn failure
4. Door interlock safety switch failure. (You should hear 3 clicks on most microwaves as the door just opens or closes... if your microwave light does not come on when the door is opened you only have 2 micro-switches and only hear 2 switch clicks.
5, Main control board relay failure / main board failure.

Those are the most common reasons listed in order of usual failures. Each one of the above possible failures has a different troubleshooting procedure.

Thanks for choosing FixYa,
Kelly

Sep 21, 2011 | Heating & Cooling

1 Answer

not working


There are various causes of failure but the checks should be carried out in this order, you will probably need a continuity meter or multimeter to trace continuity from the plug to the motor:

Check overload circuit breaker on saw hasn't tripped. This may need a couple of minutes to cool down.
If plug is rewireable check for loose screws at plug pin terminals, loose fuses etc.
Wires in power flex breaking, usually at plug or where flex enters machine.
Faulty on / off switch or loose spade terminals on switches or faulty relay on switch.
Worn out brushes.
Armature or field coils of motor going open circuit.

Mar 05, 2011 | Bosch 4000 - 07 Electric Table Saws

1 Answer

Table saw model 36-650 suddenly stopped while in use. Checked the power cords, pressed the reset switch on the motor. What are the likely causes of failure?


There are various causes of failure but the checks should be carried out in this order, you will probably need a continuity meter or multimeter to trace continuity from the plug to the motor:

If plug is rewireable check for loose screws at plug pin terminals, loose fuses etc.
Wires in power flex breaking, usually at plug or where flex enters machine.
Faulty on / off switch or loose spade terminals on switches or faulty relay on switch.
Worn out brushes.
Armature or field coils of motor going open circuit.

Feb 27, 2011 | Delta Saws

1 Answer

my table saw stopped suddenly -- what could be the problem?


Things to check:

  • Is it plugged in all the way? I've had a plug come slightly loose and lost power, though it was not immediately obvious.
  • Is there power from the outlet? Can you plug something else in and it works? If no, check breaker or fuse box.
  • Do you have a reset button on the front of your saw? If so, hit it and try turning the saw on.
  • There's typically a troubleshooting guide in the back of your manual as well. If you can't find your manual, try checking Sear's web site for manuals using your model number.
If this answer was useful, please give it a thumbs up.


Jun 08, 2010 | Craftsman 10" Table Saw

2 Answers

My 10" Craftsman table saw will not start.


Check to make sure that the power is going though the switch. Check for power at the motor. If there is power going into motor, then the armature is probable shot.

Feb 04, 2010 | Craftsman 10" Table Saw

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