GE DigitalFlow GF868, Руководство по обслуживанию

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DigitalFlow™ GS868 Service Manual 31
Chapter 4. Parts Replacement
Chapter 4. Parts Replacement
4.1 Introduction
The Model GS868 has been designed to permit easy on-site upgrades and parts replacement. See Figure 8 on page 39
and Figure 9 on page 40 for details of the standard GS868 electronics console assembly. The instructions in this
chapter, along with a few common tools and replacement parts, 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.
Note:
For compliance with the European Union’s Low Voltage Directive, 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 GS868.
An aluminum shroud with a wiring diagram label is located over the main printed circuit board. 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, 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 parts replacements performed on the Model GS868 in Appendix A, Service
Record . This service history may prove very helpful in diagnosing any future problems.
WARNING! Prior to performing any maintenance procedures, be sure to disconnect the main
power from the unit.