Parts Replacement 7-1
September 2004
Introduction The Model AT868 has been designed to permit easy on-site upgrades
and parts replacement. The instructions in this chapter, along with a
few common tools, are all that is required to perform the following
tasks:
• replacing the LCD display/keypad
• replacing the fuse
• replacing the User Program
!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 AT868.
Use Figure 7-1 on page 7-7 and Figure 7-2 on page 7-8 to locate the
relevant components, while completing the service procedures
discussed in this chapter.
IMPORTANT: Keep a detailed record of all AT868 parts
installations and replacements in Appendix E,
Service Record. This service history may prove very
helpful in diagnosing any future problems.
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