Switches

Most small appliance switches are activated by hand to control the flow of current in an appliance. A single-pole switch is pushed or moved to turn power on or off. Multiposition switches allow set amounts of current to flow, such as a multispeed switch for a blender.



Repairing Appliance Controls

Appliance controls are easily tested with a continuity tester. By placing the clip on the input side and the tester probe on the output side and activating the controller, you can
determine whether the control is functioning properly. For variable controllers, it may be easier to use a multimeter that will show you a change in resistance.


Most defective small appliance controls should be replaced rather than repaired. Once you remove the controller from the appliance, take the part, along with the appliance's model and serial numbers, to an appliance-parts dealer or electronics store to ensure that the appropriate replacement is found. A switch with a higher amp rating or a rheostat with a higher ohm rating can damage your appliance's heating element or motor. It can also be dangerous to the operator.

Where can you find replacement parts for small appliances? First, check your owner's manual to identify the model and part numbers. If you live in or near a metropolitan area, you may have a number of appliance-parts stores from which to purchase. Of course, call them first to determine if they have or can get the type of parts you require. Then take the defective part in for a side-by-side comparison with the replacement part to double-check the match before you purchase it. As a last resort, you can write to the manufacturer. In most cases, they will refer you to an area appliance-parts dealer.

Since most small appliances are made up of similar parts, it's pretty easy to troubleshoot any problem once you have the basics down. However, there are specific tips for each small appliance that may come in handy. Let's start by taking a look at how to repair toasters.

Toasters are categorized as heating appliances. Their function is to develop sufficient heat near a slice of bread to heat and toast it. Breakfast certainly wouldn't be the same without the pop-up toaster.
In many homes, toasters malfunction more than any other small appliance. There are two reasons for this. First, toasters are typically built economically to be a throw-away appliance. Replacement models start at $10.
Second, malfunctions are frequently not the fault of the toaster itself but of food particles that interfere with its operation. Excess pieces of bread broken off by carriage movement fall into the base of the toaster and accumulate, obstructing carriage movement, shorting out heating elements, plugging the latch release, and interfering with solenoid operation.
How Toasters Work
Most electric pop-up toasters all operate in the same manner. A slice of bread, a frozen waffle, a toaster strudel, or some similar food item is placed through a slot in the top of the toaster and into the carriage. The carriage is lowered into the chassis using the lever at the side of the toaster.
When it reaches the bottom, the carriage latches in position and an internal switch is activated to start the heating process. A thermostat determines how long electric current will be sent from the power cord to the heating elements.
The person who is operating the toaster sets the thermostat using a control knob or lever calibrated between light and dark. When the desired temperature is reached and the heating process is completed, the solenoid turns the current off, then unlocks the latch and allows the carriage to spring up to its original position. At this time, the toasted food is easily reachable and can be removed by the operator of the appliance.
This cross section of a toaster indicates the various elements that make a toaster work.


How to Repair a Toaster
Common toaster repairs include servicing the latch assembly, servicing the chassis, recalibrating the thermostat, and servicing the solenoid.
Servicing the Latch Assembly: The carriage and latch are vital components to the operation of pop-up toasters. If they don't work smoothly, bread or other food products cannot be held in position to be heated. To clean and lubricate the latch:
Step 1: To access the latch, remove the end panel by removing levers, knobs, and fasteners. On some models, disassemble the entire case by removing levers, knobs, crumb tray door, and fasteners. Fasteners are usually accessed from the bottom of the toaster, though some models hide them under plates and self-adhesive labels on the side.
Step 2: Once the cover is removed, inspect the latch assembly to determine if there are obvious problems such as a food particle or loose part jamming the assembly. Clean the latch area using a can of compressed air to blow away crumbs.
Step 3: Move the carriage lever up and down to check for smooth operation. If the carriage moves stiffly, carefully lubricate the rod on which the latch lever travels. Use a petroleum lubricant, making sure you don't get any of it on adjacent electrical parts.
Step 4: Check the operation of the latch to ensure that it works smoothly. You may need to carefully bend the latch so it catches properly.
Servicing the Chassis: Most of the mechanism within a toaster is mounted on a frame called the chassis. To repair or replace many internal parts, including the heating elements, you will need to remove the chassis from the toaster shell. Disassemble the toaster by removing levers, knobs, and fasteners, then carefully lift the shell off the chassis.
Some toasters will require that you disconnect the power cord internally before you can fully remove the chassis. Depending on the problem your toaster is having, you may want to replace the entire chassis or just one or two components.
Recalibrating a Thermostat: The thermostat in a pop-up toaster performs a vital function in telling the solenoid how long you want the heating elements to toast the bread. If your toaster seems to ignore your setting, the thermostat may be out of adjustment. To recalibrate the toaster:

Step 1: Clean the toaster to ensure that food particles are not jamming the mechanism or shorting out the electronics.
Step 2: To recalibrate the thermostat, make sure the toaster is cool, turn it over on its top, and open the crumb tray cover.
Step 3: On most units, a bracket from the control
knob will be visible. On this bracket there will be a calibration knob, screw, or nut that can be turned to recalibrate the thermostat. Moving the bracket toward the solenoid switch typically will shorten the toasting cycle, and moving it away from the solenoid switch will lengthen the cycle. You can shorten the cycle if the toast is
too dark or lengthen the cycle if the toast is too light.
Step 4: Close the toaster, plug it in, and toast a piece of bread to determine if the adjustment is correct. If adjusting the thermostat doesn't solve the problem, consider replacing the thermostat or the toaster.
Servicing a Solenoid: The thermostat activates a switch that operates the solenoid. The solenoid releases the latch. So if your toaster burns toast or doesn't want to release the carriage, the solenoid switch or the solenoid itself may be faulty. The solenoid switch is located near the thermostat and can be accessed by opening the crumb tray cover. Test it with a continuity tester. If it is faulty, remove it and replace it with a new switch.
The solenoid is located near the latch at one end of the toaster. To access it, remove the end cover, or the shell. Test the solenoid with a continuity tester and replace if faulty. If either the solenoid or switch is installed with rivets rather than screws, consider replacing the entire chassis or the toaster itself. Riveted parts are difficult to remove and replace without special tools.
Think you've mastered toaster repairs? Take that knowledge and use it to help you fix toaster ovens. The tips on the next page will assist you.


A calibration knob, screw, or nut can be
turned to recalibrate the thermostat