M2/M3 BFV: TROUBLESHOOTING - OD1610 - LESSON 2/TASK 1
b. General Description of the STE-M1/FVS Test Set. The power for the
operation of the test set is supplied by the vehicle. The STE-M1/FVS test
set combines common and peculiar hardware.
The common hardware items are
used for testing all the vehicles that the test set supports. This hardware
is used in conjunction with the peculiar items necessary to meet the
requirements of the vehicle being tested.
For the purpose of this
paragraph, only the common hardware needed will be described in detail. The
common hardware items consist of a vehicle test meter (VTM), a set
communicator, a controllable interface box (CIB), and associated adapters
and cable assemblies.
(1) Vehicle Test Meter (VTM).
The vehicle test meter (VTM) is the
basic unit, to which the controllable interface box (CIB) and the set
communicator are connected.
A microprocessor within the VTM controls the
internal operation and the data inputs and outputs. The VTM receives input
power from the CIB.
In the stand-alone mode, the VTM is able to measure
voltage, resistance, current, and frequency.
The VTM is part of the
VTM/Transducer Kit/Set Communicator Assembly (figure 8 on the following
page).
(2) Controllable Interface Box (CIB). The controllable interface box
(CIB) (figure 9 on page 57) is connected by cables to both the VTM and to
the vehicle being tested.
The CIB has two identical 128-pin connectors.
When these connectors are used with the test cables and peculiar hardware
items, they connect to the vehicle test connectors and active junctions.
The CIB also contains a microprocessor for multiplexing, communication, and
power control.
The CIB is a part of the controllable interface assembly
which also contains an adapter.
(3) Set Communicator. The set communicator (SETCOM) is the means by
which the test set communicates information to the operator.
A keyboard
allows the operator to communicate with the test set. These communications
include the input of test data, test numbers, responses to observations, and
commands to control the test progress. Thirty nine characters of an alpha-
numeric display are used by the operator to give instructions and request
information. The SETCOM is a part of the VTM/Transducer Kit/SETCOM assembly
(refer to figure 8).
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