Since it is not practicable to list all the possible
tests in the SMP, this discussion is limited only to
channel 14 test programs. The channel 14 test pro-
grams consist of a scan generator test routine and
various test routines that can be selected from unit 1,
2, or 3. Test routines are selected from unit 2 or 3 by
using test number select keyboard code entries to the
computer.
The DESIGNATOR SELECT switch positions at
unit 1 select tests from unit 1. Table 1-1 lists units 2
and 3 test number select codes and unit 1 DESIGNA-
TOR SELECT switch positions used to select the test
routines.
The following paragraphs provide a synopsis of
selected channel 14 test programs:
INITIAL DATA DISPLAY: This test pro-
vides an initial data display to the A/N display for
entering initial test data required for the channel 17
end-around, D/A converter, gun data, and encoder
tests.
ADDRESS DECODE TEST: This test out-
puts a unique number to each unit (1, 2, or 3) readout
to verify proper address encoding and console address
decoding.
NIXIE CYCLE TEST: This test cycles all of
units 1, 2, and 3 NIXIE readout digits from O to 9, in
unison, in a 10-second period. The test checks the
channel
output lines and the readout digital logic.
GUN DATA TEST: This testis similar to the
channel 17 end-around test, except that the test results
are displayed on the A/N display, rather than on a
printout. The test should be used for fault localization,
rather than for fault detection.
SERVO TESTS: These tests check out the
stiff-stick data, the camera-assigned codes, and the
TV sight 1 and sight 2 servo systems. The servo sys-
tems can be checked using a servo gain of 8, 4, or 2.
MEMORY CALL-UP TESTS: These tests
are used to monitor up to 12 randomly selected or
consecutive computer memory locations and to dis-
play them on the A/N displays.
When the technician troubleshoots with the aid of
the SMP, it is sometimes useful to know what data the
computer is transmitting and receiving. The memory
locations of all active computer input and output buf-
fers can be called up by using this routine.
Diagnostic Testing Programs
Diagnostic testing programs are designed to iso-
late malfunctions that occur in the internal logic of the
printed circuit boards. When other types of failures
occur, manual procedures are required, but, in many
cases, the diagnostics provide sufficient information
to identify the fictional area of the failure.
Diagnostic testing programs are useful in locating
a problem in a piece of equipment once the problem
is isolated to a unit. The unit can be systematically
tested with a printout or readout provided to the tech-
nician to indicate the problem area. Some diagnostic
programs provide an error-code readout, whereas
others provide the direct location of suspected faulty
components.
An error-code readout requires searching an area-
code table to locate the possible bad component,
while the direct component-location readout tells the
technician where the problem could be located. The
direct component-location readout method is usually
faster in producing the location of suspected failed
components.
MAINTENANCE SUPPORT
DOCUMENTATION
Maintenance support documentation falls into two
general categories: (1) logic diagrams that contain a
sequence of steps to isolate the faults causing a
specific test- or operation-related fault symptom, and
(2) system or equipment functional flow diagrams that
allow the technician to determine a sequence of iso-
lation steps.
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