TM 9-4935-481-14-1
C2
one resistor and K2 and K4 bypass the other.
Table 3-1.4. DMM LO Switch Functions
(3) Adapters A1 through A14.
DMMLO
(a) In addition to providing the mechanical and electrical interface with each UUT, a major function of the adapter Position
Function
is to program the functions of the test controls. To accomplish this, the adapter acts as a patch panel in which jumpers
connect the switches and the power, stimuli and monitor circuits. The remaining connections carry the UUT signals. Adapter SYS GND
Analog (signal) ground of the DMS.
A13 is the only adapter which contains active circuitry. Troubleshooting the other adapters can be accomplished by
1
Digital (power) ground of the DMS.
conducting continuity checks, referring to the appropriate schematics.
(b) In adapter A13, voltage regulators VR1 and VR2 function as a battery simulator for tests of TTS battery 2
Connectsto DMS-G and associated items
charger card 1All. DMS-G potentiometers 2 control adjusts the voltage level of VR1. The voltage level controls the charging
ground through DMS-D J6-72.
current level for the battery charger positive output. Similarly, potentiometers 3 control adjusts the voltage level of VR2 and
sets the current level for the negative output. The required voltage range is from less than 20 Vdc (which simulates a 3
Tracker holding fixture guidance wire common,
discharged battery) to approximately 26 Vdc (which verifies that the UUT over-voltage sensor is functioning).
monitored through J1-8 of the fixture and
(c) Adapter A8 is the self-test adapter. It interconnects the power supply outputs, test controls, and monitor
DMS-D J8-B.
circuits to expedite DMS checkout. Adapter A8 must be installed to provide monitor circuit continuity during CSCB tests.
4
TTS battery charger transformer low,
(4) Nutator test adapter. The nutator test adapter, a unit of the DMS-G, differs from the other adapters in that it
monitored through TTS J2-77 and DMS-D
electrically connects to the DMS-D. The adapter controls provide the functions necessary to test a nutator. Troubleshooting
all but two of the functions of the adapter can be accomplished with continuity tests, referring to the schematic. The clutch
J7-77.
and motor voltage controls remotely set the output level of DMS-D voltage regulators A1A26-VR1 and A1A26-VR2. These
regulators normally operate a14.5 Vdc. When the test adapter is connected to the DMS-D, a jumper between adapter 5
TTS power ground, monitored through
t
pins A and B energizes DMS-D relays A1A25-K3 and A1A25-K4. When energized, these relays connect the regulator sense
TTS J2-83 and DMS-D J7-83.
circuits to the voltage controls of the test adapter instead of the calibration controls within the DMS-D.
6
OAF power ground, monitored through
OAF J3-14 and DMS-D J8-L.
3-6. DMS-G Electrical and Electronic Circuit Analysis
.
7,8,9
Not used.
a. Operation of the printed circuit card assemblies (2A1 and 2A2) is explained in paragraph 3-4.
SEL B
DMM referenced to signal programmed on
selector B.
EXT
DMM referenced to signal applied to low side
of DMM input (J17) jack.
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