CHAPTER E - GENERAL OPERATION AND DESIGN
E-1.
General
The AMPTEC RESEARCH 620VN Explosive
Safety Igniter Tester is shown in the block
diagram (Figure E-1). All diagrams and infor-
mation disclosed in this chapter is proprietary
and is included in order to make troubleshooting
to component level possible.
The AMPTEC 620 Series Igniter Tester uses
modern solid-state semiconductors exclusively
and digital CMOS circuits extensively to mini-
mize power requirements and make battery
operation useful and practical. AMPTEC also
maintains a spare parts inventory of all compo-
nents found in the 620VNTester and it’s cus-
tomer service department can also provide
additional assistance in the trouble shooting
process.
E-2.
Troubleshooting
Since the 620VN Tester is used to test potential
deadly explosive force detonators and warheads
of missiles etc.,
personnel that are not quali-
fied to make such electrical repairs on the
620VNTester should not even attempt to
remove the calibration access screws or open
the main panel or effect any repair whatsoever
.
Apparent 620VN Tester malfunctions can some-
times be the result of bad test lead/connection
wiring, wrong connections, misinterpretation of
specifications, low battery levels, and in rare
cases due to an incomplete understanding of the
instrument and how to use it. A thorough review
of the operating instructions for this instrument
is recommended prior to any component
replacement. Check to be sure that cables and
other test equipment are in good working order
before attempting to troubleshoot the
620VNseries igniter tester .
If you turn on
the AMPTEC 620VN Igniter
Tester
and the
display does not come on it
usually means the AC to DC Adapter isn’t
supplying power
or fuse needs replacing.
If the 620VN exhibits problems
that cannot be eliminated by
reviewing Chapters B and D,
the following guidelines have
Been established to help solve the problem.
E-2-1. Localizing the Problem
The key to successful troubleshooting is to
localize the problem to a general electronic
parameter as much as possible before trying to
pin the problem down to a specific component.
Certain questions should be asked such as "Does
the problem occur on all ranges or on a specific
range only?". If the 620VN Tester does not
come on when powered up, did you check the
rear panel fuse. The power supplies for both the
current source and the digital voltmeter
electronics are also one of the first things that
should be tested. As it is not possible to
anticipate all failure modes of the 620VN
Explosive Safety Igniter Tester, servicing
personnel should become familiar with this
section to gain a complete understanding of the
internal workings of the ohmmeter.
E-2-2. Component Replacement
If the malfunction is a faulty component, the
accuracy of the 620 Series Igniter Tester can be
maintained only if it is re-calibrated after a
component replacement and the following
precautions are taken:
Use only the specified component or its exact
equivalent. Spare parts can be ordered from
your nearest AMPTEC RESEARCH Service
Center or directly from the factory by referring
to the AMPTEC Stock Number listed in the
Parts Lists section at the back of this manual.
The highest quality 63/37 grade rosin core
electronic grade solder with a 50W or lower
maximum power soldering iron should be used.
Never use an acid core solder as corrosion of
components leads and PCB etch loss can occur.
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