Taylor 430 Torque, Service Manual

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27
Model 430
Troubleshooting
Troubleshooting Thermistor Components
Step 1
Power Switch in the “AUTO” Position
Using a voltmeter, check the two terminals connecting
the transformer wires to the controller. There should be
a reading of 24 volts ( $ 15%); if not, the transformer
is not receiving line voltage or the transformer is faulty
and should be replaced. If a proper reading is obtained,
proceed to the next step.
Step 2
Power Switch in the “AUTO” Position
Using a voltmeter, make certain L1 power is being
supplied to the common terminal of the controller. A
reading of line voltage should be obtained. To
accomplish this, measure voltage between the
common terminal and any L2 power source. If a proper
reading is not obtained, make sure there is line voltage
at the incoming power supply. If there is incoming
power, back track from the common terminal (L1) and
determine where L1 is being interrupted and correct
accordingly. If a proper reading is obtained, proceed to
the next step.
Step 3
Power Switch in the “AUTO” Position
Remove the probe wires from the controller. Place a
wire between the two probe terminals of the controller
to short the component. This should activate the
compressor. If this procedure does not activate the
compressor, check for line voltage. If there is line
voltage at the compressor contactor coil, the controller
is acceptable.
Step 4
Power Switch in the “OFF” Position
Check the probe resistance. Disconnect both the white
(yellow) and black wires at the control, and measure
their resistance with an ohmmeter. At room
temperature, a reading of approximately 10,000 ohms
should be obtained. At serving temperature, a reading
of approximately 46,000 ohms should be obtained. If
this reading is not obtained, replace the probe. When
replacing the probe, fill the bulb-well with antifreeze.
Connect the white (yellow) wire to the white terminal
and the black wire to the black terminal.
Step 5
Power Switch in the “OFF” Position
Check the anticipator microswitch by removing the
wires connecting the switch to the controller, and
check for continuity. If switch continuity exists when
the draw handle is raised, the switch is effective.
Continuity should break when the draw handle is
lowered.
Figure 6