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operate correctly:
* Point level sensors
* Continuous level sensor
* LCM.
During the power-up BIT test, the LEDs flash momentarily and
then come on for three seconds. If all components pass the BIT
test, all LEDs go off. If a component did not pass the BIT test, the
related LED flashes at a two Hz rate. The results of the BIT test
for the LCM are reported by the TANK FULL LED.
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To do the power-up BIT test, put the LCM test switch in the TEST
SENSORS position. You can also do the power-up BIT test by a
push of the test switch on the attendant panel waste quantity
module.
After the LCM completes the power-up BIT test, it then starts a
continuous monitor cycle. This monitor cycle occurs every five
milliseconds. The monitor cycle makes sure that the point level
sensors and LCM are functional. The continuous level sensor
does not do a test during the monitoring cycle.
If the continuous level sensor fails after the power-up BIT test is
complete, the failure will not be sensed. An erroneous signal
from the continuous level sensor will not affect toilet operation.
You can detect errors in the continuous level sensor when you
do the power-up BIT test.
LED Status
The four red LEDs show system status. System status updates
every 250 milliseconds.
These are the conditions necessary for LED status:
LED
STATUS
OFF ON FLASHING *[1]
SENSOR J1 Tank not full. Tank full or sensor
disconnected.
Sensor fouled or
sensor failed BIT.
SENSOR J2 Tank not full. Tank full or sensor
disconnected.
Sensor fouled or
sensor failed BIT.
LED
STATUS
OFF ON FLASHING *[1]
SENSOR J3 Tank not full. Tank is above full. Sensor failed BIT.
TANK FULL Tank not full, FCU
powered.
Tank full, FCU
power off.
Two Hz flash: LCM
failed BIT. Eight Hz
flash: fatal error.
*[1] Flashing rate is two Hz unless otherwise noted.
Auto Zero Adjustment
You must do the auto zero adjustment when one of these
conditions occur:
* When you move or replace the continuous level sensor
* When you move or replace the waste tank.
You use the LCM to do the auto zero adjustment. The auto zero
adjustment calibrates the LCM for variations between the
remote diaphragm and sensor module on the continuous level
sensor.
To do the auto zero adjustment, you must make sure that the
waste tank is fully drained. You must disconnect the point level
sensors. Then you put the test switch in the TEST LAMPS
position for more than 10 seconds.
These lights will go off for three seconds to show that the test is
complete:
* SENSOR J1
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* SENSOR J2
* SENSOR J3
* TANK FULL.
The POWER ON light will stay on.
Training Information Point
NOTE: Make sure that you drain the waste tank fully before
you do the auto zero adjustment procedure. If you do
not drain the waste tank fully, an error in the waste
quantity indication can occur.
NOTE: The two point level sensor connectors are identical.
Make sure that you connect the point level sensor
connectors to the correct receptacle on the LCM.
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38-33-00-004
WATER/WASTE - WASTE TANK QUANTITY INDICATION SYSTEM - LOGIC CONTROL MODULE
WATER/WASTE - WASTE TANK QUANTITY INDICATION SYSTEM - LOGIC CONTROL MODULE
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Purpose
The waste quantity indicator shows the level of waste in the
waste tank.
Location
The waste quantity indicator is a part of the attendant panel at
the aft attendant station.
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