Appliance Cords; Fuses; Switches; Heating Elements - Gardner Bender GMT-18A Manual Del Propietário

Figure 9

7.2 Appliance Cords

Unplug the appliance from its power source. Turn its power
switch to the ON position. Touch the test leads to the metal
prong ends of the cord. The tester should indicate a low
resistance value. If not, flex the cord while the leads are still in
contact with the metal prongs. If the needle indicator moves
sporadically, while the cord flexes, there may be a broken
conductor in the cord. If the needle indicator does not move at
all, there may be an open circuit in the appliance. Should it be
determined that the cord is not the source of the problem, the
appliance may need to be disassembled in order to pinpoint
the problem. Refer to the owners manual of the appliance.
The manufacturer of the appliance may require that the
appliance be serviced only by a qualified repair technician.

7.3 Fuses

Note: With the power OFF, always remove a fuse from its
socket before testing it. With cartridge fuses, touch the test
leads to each end of the fuse (see fig. 10). If the fuse is good,
the needle indicator will move to -0- ohms. If not, replace the
fuse. On plug-type fuses, touch the the test leads on the
bottom contact and the other on the threaded metal contact
(see fig. 11). On time-delay/tamper-proof fuses, the other
metal contact is at the top of the ceramic threads.
Figure 10
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Figure 11
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7.4 Switches

Disconnect the power source to the switch. If necessary, remove
the switch from whatever it's mounted to. Turn the switch to
the ON position and touch the test leads to the switches termi-
nals (see fig. 12). If the switch is good, the needle indicator
will move to -0- ohms. If not, replace the switch. On other than
two-way SPST (single pole, single throw) switches such as
three-way light switches or double pole double throw (ON-
OFF-ON) switches, in each ON position you will need to
alternate the test leads between the switches terminals to
determine which two terminals control that ON position.
Figure 12

7.5 Heating Elements

Household appliances such as coffee makers and water
heaters contain heating elements which may require
troubleshooting. When making continuity checks on heating
elements, disconnect the element(s) from the circuit(s) that
supply it/them. Touch the test leads, one on each end of the
element and observe the needle indicator. The reading should
indicate low ohms. If the needle indicator doesn't move, the
heating element is broken. If the element(s) show that
continuity exists, test for continuity of the circuit(s) that feed
the element(s) .

7.6 Thermostats

Make sure the thermostat control is in the OFF position.
Remove the thermostat cover. Touch the test leads to the
contact points on the thermostat. The needle indicator should
move to read -0- ohms. If not, either one of the contacts may
be loose or broken.
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