Improper outlet voltage and/or grounding.Bad brushes or damaged commutator plates.If the motor hums or smokes, it's typically one of these problems: Do not run the tool if you suspect brushes, you can permanently damage the motor. If the motor arcs excessively (a little visible arcing is normal), the brushes may need replacing. You can sometimes get replacement switches at a reasonable price. If the switch feels funny and/or nothing happens when it is turned on, then it could well be a busted switch - which is pretty common.
SKILSAW MODEL 77 CORD REPLACEMENT CRACKED
Some uniform case discoloration due to age and UV exposure can be okay - as long as the case is not also cracked or brittle. If the case is plastic and is discolored anywhere, it has likely degraded to the point that the tool is either unsafe or it's just not worth repairing.If the visual inspection is failed, it should be obvious what to do. Any unusual noises? Humming, or squealing?.Does the motor hum or smoke when turned on? (Of course, Immediately switch it back off if it does this.).Note that it is possible for a circuit to look okay with the meter and still be bad under load - or for control electronics to be bad. If you are comfortable with an ohmmeter, you can use it to do basic checks on the cord and switch.Does the the power switch feel normal? Usually a busted switch will feel "off" (Pardon the pun.).Other oozings would point to catastrophic motor damage, or sometimes electronics failure or starting capacitor failure.ĭoes the tool rotate/reciprocate relatively normally when moved by hand? Has an oily, greasy, or varnishy fluid dripped or oozed out of any part of of the unit? Grease could indicate bearing failure.Use one of those circuit checkers you can get for $2. If the unit came with a grounded plug, be sure that it's undamaged and that the power plug really is a properly wired grounded outlet.Is the safety switch/lock, if present, installed and/or on?.Was the tool used until it might have become too hot? Many tools have a safety, over-temperature shutoff wait an hour for it to reset.Is a fuse or reset button present? Is it blown or popped out?.Are the plug contacts reasonably straight and untarnished?.On the power cord, is the insulation cracked at any point or is one or more strain-reliefs damaged or missing (especially where the cord enters the tool)?.Is the case discolored or cracked at any spot?.Has the unit been exposed to too much dust, ash, water and/or fine sawdust?.Is anything potentially jamming a mechanism?.With the unit unplugged and/or the battery removed: Here's a first-stab at a troubleshooting guide:
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