ARMY TM 5-6675-308-34
MARINE CORPS TM 08837A-34/2
Section III. TESTING AND TROUBLESHOOTING
the solid state memory for diagnostic alignment and the
4-8. General.
reloading for operation is not necessary. Only IMU
NOTE
calibration constants need be loaded when the memory
is to be dedicated to a different IMU. Refer to table
The computer is the primary tester for
the CDU and IMU. Perform the com-
bd for IMU calibration constants loading. In the event
puter test to verify proper computer op-
that the solid state memory must be reloaded with the
eration before testing a CDU or IMU.
solid state program, refer to table 4-6.2 or 4-6.3 for
loading instructions.
a. General support troubleshooting of the PADS
consists of performing testing and troubleshooting of
the computer, CDU, PS, and computer power supply as
outlined on tables 4-6, or 4-6.1, 4-7, 4-11, 4-19, and
4-20, and IMU testing, alignment, and troubleshooting,
as outlined in table 4-14 or 4-14.1. Tables 4-6 and 4-14
use PADS test set punched tape reader, part no.
The tapes used in testing and operating
877406-1, and tables 4-6.1 and 4-14.1 use punched tape
the PADS are electrically conductive.
reader, part no 877406-2. The equipment setup and
DEATH OR SERIOUS INJURY, as well
program load sequence described in table 4-6, 4-6.1,
as damage to tapes may result if the tapes
4-6.2 and 4-6.3 is common for the computer, CDU, or
are allowed to come into contact with
IMU. It should be noted that if an IMU dedicated
115 VAC.
memory is used for the testing, the alignment data is
lost. Therefore, the IMU calibration tape must be
reloaded into the dedicated memory. If only computer
or CDU testing is to be performed, use a spare memory
When removing, replacing or handling the
instead of the IMU dedicated memory. If an IMU is
solid state memory, do not touch connector
being tested, the IMU dedicated memory must be in-
pins or components on face of assembly as
stalled in the computer. The procedures in the tables
damage to the memory may result.
are arranged in three columns. The first column con-
tains the test operation procedures to be performed.
Ensure that the solid state memory is
The second column contains the normal indication to
transported in conductive bag with CAU-
be observed when the procedure has been performed.
TION label identifying its contents as
The third column contains the corrective action to be
static-sensitive device.
taken if the normal indication is not obtained. If a
Prior to removal of the solid state mem-
corrective action is not given where a normal indication
ory from packaging, operator should dis-
is given, this normal indication is a function of the test
charge static electricity by making arm
equipment, and if abnormal, the applicable technical
contact with earth ground.
manual should be referred to for test equipment mal-
functions. Whenever a corrective action has been taken,
the complete testing and troubleshooting procedures
must be followed in the sequence given. All PADS
dure.
equipment must be installed in the primary pallet
a. Test Equipment and Materials.
during testing and troubleshooting.
(1) PADS test set consists of the signal processor
b. There are two types of memory units available
unit (SPU) punched tape reader (tape reader), buffer
for the computer; a core or a solid state memory. The
unit, interconnecting cables, and auxiliary equipment.
determination of the memory type is important because
the program loading instructions are different for each
(2) Teletypewriter.
memory. The memory type, if unknown, can be deter-
NOTE
mined by following the steps in table 4-6 or 4-6.1.
The 100-wpm motor worm gear must be
c. The core memory contains only one program at
installed prior to use. Refer to TM 11-
a time, either the diagnostic alignment program or the
5815-200-12.
operational program. Follow instructions in table 4-6 or
4-6.1 for diagnostic alignment program loading.
(3) PADS power supply, pallet frame, and battery
box.
d. The solid state memory contains both the diag-
nostic alignment and operational programs. Loading of
(4) + 28V power source.
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