Mechanical and Electrical Dryer Repair

The following information describes the procedures used to test and repair the mechanical and electrical components of clothes dryer.

Electrical Dryer Checks
Warning: To avoid electrical shock, disconnect the power supply before testing any component. When testing the drive motor, be sure that the motor and test cord are grounded. General the recommended method to check electrical component, is with the aid of a volt. When testing a component, remove the wires that are connected to it. The producing electrical components such as motors, solenoid coils, and healers will show tile resistance of the circuit in ohms. Contacts that are closed in timers or switches should not show any appreciable resistance between the terminals. By following a timer chart and positioning the timer in a given cycle, the timer contacts can be checked. Switch charts show opened and closed Contacts in the various selector switch positions. These charts should be followed when testing a switch.
Motor circuit Electric and gas dryers when diagnosing an electrical problem, always keep in mind the current flow needed to operate a dryer motor (120 volts). The electrical current must go through the power supply circuit protector (fuse or circuit breaker), dour switch the moment switch in conjunction with the internal motor switch, the timer, selector switch, and the motor thermal overload protector.

To test the drive motor, use the following procedure:
1. Mark the location or color code of the lead wires. Remove any external power source leads from the motor. Do not remove the internal motor leads to tile motor switch.
2. With an external 120-volt ac dryer grounded power supply, connect the wires to terminals. The motor should run. If it does not run, remove the motor from the unit.
3. Oil open-framed motors, make continuity test on the motor leads, terminals switch, and between terminals I and 5 of the switch. If an open circuit is indicated on either test, replace the Switch and repeat the above tests.
4. To test terminal 5, connect the 120-volt power leads to terminals 1 and 3. Apply power, and at the same time, jumper terminals and 5 just long enough to bring the motor up to speed. Remove the juniper. The motor should continue to operate with the leads on terminals 1 anti 5. If the motor slops, replace the switch.

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