GE DigitalFlow GC868, Руководство по обслуживанию

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Parts Replacement 4-1
April 2008
Introduction
The electronics console of the Model GC868 has been designed to
permit easy on-site upgrades and parts replacement. See Figure 4-1
on page 4-10 and Figure 4-2 on page 4-11 for details of the standard
GC868 electronics console assembly. The instructions in this chapter,
along with a few common tools, are all that is required to perform the
following tasks:
•
fuse replacement
•
printed circuit board (PCB) removal and installation
•
EPROM replacement
•
option card installation
•
LCD display replacement
IMPORTANT:
For meters supplied in any of the optional enclosure
types, see Appendix B,
Optional Enclosures, for
instructions specific to that unit.
!WARNING!
Prior to performing any maintenance procedures, be
sure to 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 GC868.
An aluminum shroud over the printed circuit board shields the
electrical components and serves as a location for the wiring diagram
label. All of the procedures discussed in this chapter, except for fuse
replacement, require removal of this shroud.
Note:
For compliance with the European Union’s Low Voltage
Directive (73/23/EEC), a transparent plastic shroud protects
the electrical connections. The shroud must remain in place,
except while wiring the unit. Reinstall the shroud after the
wiring has been completed.
Use the foldout drawings at the end of this chapter to locate the
relevant components, while completing the following procedures.
IMPORTANT:
Keep a detailed record of all service procedures
performed on the Model GC868 in Appendix A,
Service Record . This service history may prove very
helpful in diagnosing any future problems.