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TM 5-4120-361-14
Section VI.
TROUBLESHOOTING
4-18.
General.
This section contains troubleshooting
instructions for the isolation of causes
and common troubles that may occur dur-
ing operation, and also gives the pos-
sible remedies to correct the trouble.
4-19.
Organizational Troubleshooting
Chart.
a.
General.
Troubleshooting proce-
dures for organizational maintenance
personnel are listed in table 4-2. AS
shown in the table, troubleshooting be-
gins by identifying the malfunction.
Next, suitable tests or inspections are
made in step-by-step order.
Finally, a
corrective action is given.
Remedies
beyond the scope of organizational main-
tenance must be reported to direct sup-
port maintenance personnel.
Additional
procedures are given in paragraphs(b)
and (c) which follow:
b.
Control Circuit.
The cause for
the–failure of the system to operate can
be narrowed to a specific portion of the
system if the control component associ-
ated with the failure can be isolated.
It is the purpose of safety devices to
open the circuit under certain overload
or fault conditions.
If a safety device
is open, additional checking is required
to determine if the open is due to a
faulty safety device or if the safety
device is performing its intended func-
tion, and the fault is located elsewhere
in the system.
To check the control
circuit, proceed as follows:
(1) Disconnect air conditioner from
source of power.
(2) Using a series test lamp or
ohmmeter, check the continuity through
each control in the affected circuit
with the control in the closed position
while being checked.
Use the system
schematic and wiring diagram for point-
to-point circuit tracing.
(3) Replace each defective part
with a serviceable like item.
c.
Safety Devices.
When testing the
control circuit and associated compo-
nents, take into account the normal
state of the safety device.
Determine
(1) whether it is normal for the device
to be open under the existing conditions
or (2) if the open condition indicates
trouble elsewhere in the air condition-
er.
4-8
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