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Pellerin Milnor Corporation
69
Figure 10. Level Sensor Testing Fixture
Fixture
Legend
A... graduated tube from pressure transducer
B... cylinder filled to near top with water
C... base plate
Display or Action Explanation
R00088 A:01.7 C:01.0 The top line of the display applies to the level sensing circuit. The
“R” and the five characters immediately following it on the top
line indicate the voltage being delivered by the pressure trans-
ducer on the processor board (see
Figure 9: Processor Board, page
66 ). The “A” value is the actual instantaneous level read by the
transducer. Because this display is only available when the drain
is open, the actual level will normally reflect no water in the ma-
chine cylinder, although the number will be above 0. The “C” val-
ue is a calculated average of the transducer levels, used to negate
the effects of rising and falling water levels caused by the revers-
ing wash motion. Again, in normal conditions, this value will re-
flect that there is no water in the machine, although it may
fluctuate between two values (e.g., 1.0 and 2.0) as it adjusts to the
nearest whole inch.
R00099 A:082F [TEMP]
When using the level sensor test fixture ( Figure 10: Level Sensor
Testing Fixture, page 69 ), the display should indicate approxi-
mately the level to which the graduated plastic tubing is inserted
into the water.
The bottom line of the display applies to the temperature sensing
circuit. Similar to the “R” value of the top line, the first six char-
acters of the bottom line indicate the voltage being delivered by
the temperature probe to the processor board (see
Figure 9: Pro-
cessor Board, page 66 ). The “A” value on the bottom line is the
temperature in degrees Fahrenheit detected by the temperature
probe.
Troubleshooting