Teledyne ADFM Analog Output Module, Техническое руководство, Страница: 60 / 156

Chapter 6
6-5 Least Replaceable Assembly Fault Isolation
The following procedure is intended to assist fault isolation in cases where:
•
The Built-in-Test (BIT) can not be executed (no ADFM Wake-Up
for example) or
•
The BIT determines an ADFM Transducer problem
It is not necessary to follow this procedure for routine maintenance. How-
ever, the Built-In Tests may be executed on a routine basis.
CAUTION. The following servicing instructions are for use by service-
trained personnel only. To avoid dangerous electric shock, do not perform
any service unless qualified to do so. Please read section “GENERAL
WARNINGS AND CAUTIONS” for more important information.
For the following procedure the top cover of the ADFM Electronics Unit
must be removed from the chassis. This exposes the Electronics Unit’s cir-
cuitry. Especially if mains power is used to power the ADFM, dangerous
voltages which may cause personal injury due electrical shock are present at
various location on the board, in particular where marked with a lightning
bolt located inside a triangle.
CAUTION. The ADFM contains Electro Static Sensitive Devices. You must
take accepted ESD prevention measures BEFORE OPENING THE ADFM
ELECTRONICS UNIT.
The circuitry contains electro-static sensitive devices throughout the ADFM
Electronics Unit. To prevent electro-static discharge (ESD) to these compo-
nents, you must ground the Electronics Unit as well as your self. Use an
ESD wrist strap (or other accepted means) to ground your self. Please keep
in mind that even if an ESD has occurred the ADFM may still work, but its
reliability may be seriously impaired.
6-5.1 Built-in Test is Not Executing
If the built-in test (BIT) can not be executed, most likely it is caused by one
of the following:
•
Faulty Communication
•
No Power or a faulty ADFM power supply
Communication
If the built-in test can not be executed because of a communication problem
between the host computer and the ADFM, or at any other time communica-
tion can not be established, the following procedure may help you to isolate
the problem.
page 6-6 MGD Technologies, Inc.