Giga-tronics GT 9000, Operation & Maintenance Manual

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5
Maintenance
5.1 Introduction
Under normal operation, the GT 9000 requires little regular maintenance. It is recommended
that the calibration procedure (as described in Chapter 4 of this manual) be performed at
one-year intervals to insure operational accuracy. The air inlet screen should be cleaned
whenever a noticeable amount of dirt has accumulated.
During the warranty period of the GT 9000, it is recommended that no user initiated service
work be performed without first communicating with the factory (or our authorized
representative). Often the problem can be readily isolated to a particular plug-in module, for
which a replacement can be sent.
Before any other analysis is attempted, three potential problem areas should be eliminated.
First, be sure that all front and rear panel controls are properly set. An apparent malfunction
may be the result of an operator error, such as selecting external modulation without furnishing
the needed modulation input. Second, establish whether the problem exists only under remote
control; if so, the cause could be a malfunctioning controller, an improper bus address, or an
erroneous remote control command. Third, clean the plated edges of the plug-in circuit boards
with a rubber eraser and alcohol (malfunctions are often caused by an accumulation of dirt on
these edges).
Manual No. 120AM00250, Rev C, September 1998
5-1