Miteq D-9301, Operation And Maintenance Manual, Page: 50 / 86

5-1
SECTION 5
MAINTENANCE
5.1 INTRODUCTION
This section includes information and instructions for periodic
monitoring of converter performance, information for
troubleshooting, alignment and adjustment of the converter in
case of converter malfunction.
5.2 PREVENTIVE MAINTENANCE
The converter is a completely solid state design. Normal
periodic inspection for cleanliness and mechanical integrity
should be made in accordance with standard procedures.
To prevent long and costly downtime of the converter periodic
monitoring of the overall converter performance parameters that
are most indicative of individual converter component performance
is necessary. A log should be maintained that provides a
permanent record of converter operation and compares it to
factory provided data. By doing so, any long term degradation,
erratic or abnormal performance can be detected early. The
overall converter performance parameters that are most indicative
of individual system component performance and encompass all
system components for correct overall converter performance are
converter gain and local oscillator frequencies.
Any excessive change in converter gain indicates a malfunction in
the local oscillator and/or signal channel and/or in the power
supply. Any excessive frequency change indicates malfunction in
phase locking to the reference oscillator.
5.2.1 DC VOLTAGE
Connect the digital voltmeter to the DC test points on the rear
panel. If voltage is beyond tolerance (see Section 4.3.4), reset
power supply (refer to Appendix and Figure 1-3), using the tuning
adjustment on the power supply.