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Introduction
Rack Mount Enclosure
Optional Enclosures
The Model DF868 is available in optional enclosure types, each of
which has been designed to permit easy on-site upgrades and parts
replacement. See the foldout drawings at the end of this appendix for
details of the applicable DF868 electronics console assembly. The
instructions in this appendix, along with a few common tools, are all
that is required to perform the following tasks:
•
fuse replacement
•
option card installation
•
EPROM replacement
•
LCD display replacement
•
printed circuit board (PCB) replacement
IMPORTANT:
For meters supplied in the standard Type-4X
enclosure, see Chapter 4, Parts Replacement, for
instructions specific to that unit.
Prior to performing any maintenance procedures,
disconnect the main power from the unit.
Note: For compliance with the European Union's Low Voltage
Directive (73/23/EEC), this unit requires an external power
disconnect device such as a switch or circuit breaker. The
disconnect device must be marked as such, clearly visible,
directly accessible, and located within 1.8 m (6 ft) of the
Model DF868.
Refer to Figure B-1 on page B-10 and Figure B-2 on page B-11 for
the location of the relevant components, while completing the
following procedures. If the top panel of the meter is accessible,
service may be performed without removing the meter from the rack.
Otherwise, disconnect all rear panel electrical connections and
remove the meter from the rack before proceeding.
IMPORTANT:
Keep a detailed record of all service procedures in
Appendix A, Service Record. This record may prove
very helpful in diagnosing any future problems.
!WARNING!
March 2008
B-1
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