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Disassembly - TM-5-6640-213-140087
Up
TM-5-6640-213-14 Laboratory Air Mobile Aviation Fuel NSN
Next
Table 3-4. Air System Troubleshooting
TM 5-6640-213-14
(7)
Troubleshooting.
A troubleshooting chart for the air
system is listed in table 3-4.
COMBUSTIBLE
GAS
ALARM.
3-5.
a.
Inspections.
(1)
Daily
(a) Inspect the instrument and pilot lights to see
that they show normal  operation.
(b)  Check  the  meter
readings
and
investigate
any
abnormal
deviations  from  zero.
(2)  Weekly.
Check meter readings and adjust zeros if
necessary
while  detectors  are  in  a  combustible  gas-free  environment.
(3)  Periodic.
Check  response  of  the  instrument  period-
ically by exposing the detector to a sample of combustible gas of
known  concentration.
b.
Services.
(1)  Replace
pilot, alarm and fail lights when found defec-
tive in operation.
(2)
Calibrate
the
instrument,
as
follows:
(a) Expose the detector to a known concentration of
combustible gas in the air.
(b) Correct meter reading by adjusting the gain ad-
juster on the printed circuit board using a known concentration of
gas or the test and calibration kit, which can be obtained commer-
cially.
(c)  Replace  the  detector  element  (c.(2)  below)  when-
ever it is no longer possible to make the zero adjustments within
the span of the zero adjuster on the corresponding control module.
Check detector voltage between the detector voltage test points on
the printed circuit board each time the element is replaced.
.
Detector
Voltage
Measurement
and
Element
Replacement.
c.
(1)  Voltage  measurement.
Two people are required to per-
form  the  initial  detector  voltage  settings  and  measurement  - one
person at the control unit (fig. 3-4) and one preson at the remote
detector (A, fig. 3-5 and item 7, fig. 2-8).
Refer to figure 3-5 and
proceed as follows:

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