troubleshooting and repair of small household appliances and power tools

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Notes on the Troubleshooting and Repair of Small Household Appliances and Power ...Page 1 of 239

Notes on the Troubleshooting and Repair of Small Household Appliances and Power ToolsVersion 2.77 (13-Jan-06)Copyright 1996-2006 Samuel M. Goldwasser --- All Rights Reserved --For contact info, please see the Sci.Electronics.Repair FAQ Email Links Page. Reproduction of this document in whole or in part is permitted if both of the following conditions are satisfied: 1. This notice is included in its entirety at the beginning. 2. There is no charge except to cover the costs of copying.

Table of ContentsPreface Author and Copyright DISCLAIMER Introduction Where do you keep your dead appliances? Some Tidbits Basic Appliance Theory What is inside an appliance? Basic electrical principles Voltage, current, and resistance Ohm's Law DC and AC Series and parallel circuits On-line educational resources Appliance Troubleshooting SAFETY Safety myths Safety guidelines Should I unplug appliances when not in use? Troubleshooting tips Basic hand tools Soldering techniques Desoldering techniques Soldering pins in plastic connectors Solderless connectors

http://www.repairfaq.org/sam/appfaq.htm

10/04/2006

Notes on the Troubleshooting and Repair of Small Household Appliances and Power ...Page 2 of 239

Wire stripping Attaching wires to screw terminals Test equipment Getting inside consumer electronic equipment Getting built up dust and dirt out of a equipment Lubrication of appliances and electronic equipment Common appliance problems Types of Parts Found in Small Appliances So many, so few Cordsets - wire and plug When a cordset is more than a cord and plug Appliance cord gets hot Extension cords Extension cord repair Determining the location of a break in an extension cord Internal wiring - cables and connectors Switches - power, mode, or speed selection About mercury wall switches Comments on mercury poisoning Relays - electrically activated switches for power or control Contact configurations Electrical overload protection devices - fuses and circuit breakers Fuse postmortem Fuse or circuit breaker replacement Thermal protection devices - thermal fuses and thermal switches Comments on importance of thermal fuses and protectors More on thermal fuses Controls 1 - adjustable thermostats and humidistats What is hysteresis? Controls 2 - rheostats and potentiometers Interlocks - prevent operation with case or door open Light bulbs - incandescent and fluorescent Indicators - incandescent or neon light bulbs or LEDs Heating elements - NiChrome coils or ribbon, Calrod, Quartz Repair of broken heating elements Solenoids - small and large Small electronic components - resistors, capacitors, diodes Transformers - low voltage, high voltage Motors - universal, induction, DC, timing Fans and Blowers - bladed or centrifugal Bearings and bushings Mechanical controllers - timing motors and cam switches Electronic controllers - simple delay or microprocessor based Batteries - Alkaline, Lithium, Nickel-Cadmium, Lead-Acid AC adapters and chargers - wall 'warts' with AC or DC outputs AC Line and Battery Powered Household Appliances Table lamps Rebuilding a basic table lamp Lamps with night-light bulbs in their base What causes a lamp to flicker? High intensity lamps Halogen lamps and fixtures Safety guidelines for use of halogen lamps

http://www.repairfaq.org/sam/appfaq.htm

10/04/2006

Notes on the Troubleshooting and Repair of Small Household Appliances and Power ...Page 3 of 239

Bad connections in halogen lamps Touch lamp problems Touch lamps and RF interference Incandescent fixtures Removing the base of a broken light bulb Locating burnt out bulbs in series circuits Comments on Christmas tree bulb/string repair Shortening a Christmas light string Controlling a fixture or outlet from multiple locations UK translation for 3-way and 4-way wiring Identifying unmarked wiring or improperly functioning 3-way switch Dimmer switches and light dimmers Typical dimmer schematics Simplest dimmer schematic 3-way dimmer schematics Simple 3-way dimmer schematic 1 Simple 3-way dimmer schematic 2 True (electronic) 3-way (or more) dimmers Independent dimming from two locations - kludge #3251 Humming or buzzing lamps or fixtures on dimmers How do touch dimmers work? Light dimmers and interference with radio or TV Dimmer wall plate hot to touch Can I use a dimmer to control transformer operated low voltage lighting? Causes of dimmer failure Flashlights and lanterns Typical rechargeable flashlight schematics First Alert Series 50 rechargeable flashlight schematic Black & Decker Spotlighter Type 2 rechargeable flashlight Brand Unknown (Made in China) rechargeable flashlight schematic Solar Powered Walk Light Makeup mirrors Chandeliers Overhead (and other basic slide) projectors Portable fans and blowers Computer power supply (and other) fans Piezo fans Speed control of DC fans Speed control of small AC fans Ceiling fans Lubricating ceiling fans Variable speed ceiling fan on normal circuit Throbbing noise from ceiling fan Ceiling fan motor speed control and capacitor replacement Mike's notes on ceiling fan installation Ceiling fan construction Air cleaners Electronic air cleaner high voltage module schematic Auto air purifier schematic Bug zappers Electric fences Appliance and light timers Warnings about using compact fluorescent lamps on electronic timers Wall thermostats Testing a thermostat

http://www.repairfaq.org/sam/appfaq.htm

10/04/2006

Notes on the Troubleshooting and Repair of Small Household Appliances and Power ...Page 4 of 239

Replacing a thermostat Electric space heaters Radiant space heaters Convection space heaters Oil filled electric radiators So, what about the Pelonus Disk furnace? Electric pencil sharpeners Blenders Drip coffee makers Drip coffee maker repair Coffee percolators Electric kettles Electric (motor driven) clocks Rotisseries Electric can openers and knife sharpeners Electric carving knives Electric scissors Portable and stationary food mixers Food processors Steam and dry irons Toasters Automatic toaster will not drop bread Toaster oven (broilers) Troubleshooting a toaster oven Circuit diagram of typical toaster oven/broiler Circuit diagram of Toastmaster toaster oven/broiler with electronic controls Convection oven noise Hot plates, waffle irons, broilers, deep friers, rice and slow cookers, woks Popcorn poppers (oil type) Popcorn poppers (air type) Electrical heating tape Automatic bread machines Sewing machines Wiring a sewing machine speed control Shavers Comments on Norelco shaver maintenance and repair Electric toothbrushes Inductively coupled charging circuit Braun electric toothbrush repair Hand massagers Hair dryers and blow dryers The Ground Fault Circuit Killer (GFCK) Curling irons VCR cassette rewinders Vacuum cleaners, electric brooms. and line powered hand vacs Vacuum cleaner mechanical problems Vacuum cleaner electrical problems Vacuum cleaner hose damage High tech vacuum cleaners? Dustbusters(tm) and other battery powered hand vacs Dustbusters left on continuous charge and battery problems Floor polishers Heating pads Electric blankets Humidifiers

http://www.repairfaq.org/sam/appfaq.htm

10/04/2006

Notes on the Troubleshooting and Repair of Small Household Appliances and Power ...Page 5 of 239

Ultrasonic humidifiers Ultrasonic waterfalls? Ultrasonic cleaners Fog machines Dehumidifiers Garbage disposals Garbage disposal pops reset button but nothing blocked Garbage disposal is stuck - hums but does not turn Garbage disposal seizes repeatedly Garbage disposal replacement (or upgrade) Sump pumps and utility pumps Toys Incorrect response for remote control toys Garage door operators General garage door operator problems Garage door operator light does not work correctly Garage door operator loses track of where it is Garage door remotes behave differently Adjusting garage door operator remote unit Improving sensitivity of garage door openers receivers Universal remote/receiver units for garage door operators Garage door operator doesn't work reliably in cold weather Chamberland garage door opener repair? Garage door operator security Identifying unknown transformer ratings in garage door operator Electromechanical doorbells and chimes Weak or erratic mechanical chimes Adding an additional set of chimes How to add an addition button to a door bell Wireless doorbells or chimes Doorbell rings on its own Old garage door operator guts for wireless chime TV antenna rotators Power Tools Types of motors found in power tools Motors in AC line operated portable tools Motors in cordless power tools Motors in stationary power tools About horsepower ratings Cords for AC line operated portable power tools Portable drills AC line powered drills Upgrading the bearings on a Craftsman drill Cordless drills Other direct drive tools Saber saws, reciprocating saws Electric chain saws Circular saws, miter, and cutoff saws Grinding wheels Polishers, rotary sanders Orbital sanders and polishers Belt sanders, power planers Air compressors Paint sprayers

http://www.repairfaq.org/sam/appfaq.htm

10/04/2006

Notes on the Troubleshooting and Repair of Small Household Appliances and Power ...Page 6 of 239

Heat guns Paint strippers Soldering irons Soldering guns Wet-dry vacs, yard blowers/vacs Hedge trimmers Electric lawn mowers Incandescent Light Bulbs, Lamps, and Lighting Fixtures Incandescent light bulbs - single and three way Why do my light bulbs seem to burn out at warp speed? Halogen bulbs Efficiency, lifetime, and failure modes of halogen bulbs Use of dimmers with halogen bulbs The humorous side of light bulbs Notes on bulb savers Can you prove that bulb savers do not work? Motors 101 Small motors in consumer electronic equipment Identifying type of unknown motor Universal mot

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