TM 1-6625-476-30
6-3
6-5. TEST CONCEPT. (CONT)
a. Procedures. Section III contains procedures to remove the IVO electronics assembly from shipping
and storage container and to replace it in the container. These procedures do not apply to the UUT test
until called for by the test program. At the appropriate time during the test, a message prompt on the
VDT will direct you to perform a set of procedures in this section. At that time, turn to the referenced
paragraph and perform those procedures, as the program cannot continue until they have been
performed.
b. Illustrations. Section IV contains illustrations that supplement the UUT test procedures on the VDT.
The procedures cannot be successfully accomplished unless you refer to the appropriate illustrations
when directed by message prompts. In addition to showing you how to make an adjustment or locate a
component, many of the illustrations contain explanatory data, cautions relating to equipment damage,
and warnings relating to shock hazards. At the appropriate time during the UUT test, a message prompt
will refer to an illustration in section IV. Turn to the referenced illustration for assistance while performing
the following instructions on the VDT.
6-6. TEST DESCRIPTION.
Three kinds of tests are performed by the UUT test program. These tests are described below.
a. Electrical Test. The test program measures resistances, voltages, and time intervals of circuits inside
the IVO electronics assembly.
b. Prealinement. The test program measures the size, centering, focus, and rotation of electronics
assembly video at the 875 and 525 line rates. You are instructed to adjust any parameter that is out of
tolerance.
c. E/O Algorithms. This is a depot measurement. The test program compares the values obtained in the
pre-alinement tests with fixed values. CRT brightness is measured.
6-7. PRETESTING DATA.
At times, the UUT test program will appear to have stopped for up to 1 hour. This is because some
portions of the program require this amount of time to execute. During these times, a prompt will appear
on the VDT explaining that a program delay is in progress.
6-8. FINAL ACCEPTANCE.
When the IVD electronics assembly has been repaired, repeat the UUT test. If an ALL TESTS GO
prompt is received at the end of the test, the IVD electronics assembly is considered to be fully
operational.
