SECTION
5
TESTING
Individual components and assemblies in the GMA 340 Audio Panel can be
damaged by ESD (Electrostatic Discharge). Observe proper ESD procedures
when troubleshooting the unit.
5.1
GENERAL
Included in this section are the test equipment required, test setup data and testing procedures for units removed
from an aircraft or from storage before use in an aircraft. These tests are intended to be performed with the dust
covers on. After failure of a specific test the unit may be returned to the factory for repair or opened for further
testing and troubleshooting. Repair is limited to replacement
of
field replaceable assemblies listed in Section
1
,
paragraph
1.2.
After completing all necessary maintenance or service accomplish section
5,
TESTING to ensure that
all
functions are operating properly.
5.2
ADJUSTMENT/MEASUREMENT ACCURACY
Some output parameters are factory adjusted to specific levels. Test levels may not be accurate if the unit has
been readjusted in the field.
5.3
TEST EQUIPMENT PRECAUTIONS
To prevent introducing errors resulting from the connection of voltmeters, oscilloscopes and other test equipment
across the input and output of the GMA 340, all audio voltage measurements should be differential. The
HP-8920B RF Test Set supports this measurement technique (refer to
HP-8920B
user’s manual.)
Test equipment ground clips must not be left attached to the GMA 340, even when not being used, if the
corresponding test equipment is not isolated from ground. The bench power supply ground must be connected to
earth ground and serve as a single point ground for the entire test setup. If associated test equipment does not
have a provision for isolating input/output
BNC
ground terminals from power ground, the equipment should be
isolated from power ground using a ground isolator.
5.4
REAR CONNECTORS PRECAUTION
The GMA 340 contains two identical 44-pin connectors designated
J1
and
52
located at the rear
of the unit. Avoid misconnection to the unit. Test harness misconnection could cause permanent
damage the GMA 340 unit.
190-00149-02
Rev
B
5-1
The document reference is online, please check the correspondence between the online documentation and the printed version.
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