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GNS 400W Series Maintenance Manual
Page 4-1
190-00356-05
Rev. A
SECTION 4
TROUBLESHOOTING/TESTING
WARNING
Hazardous voltages exist on the inverter board. Voltages range up to 2500 V ac
peak to peak under normal operating conditions. Under open circuit conditions
voltages can range over 8000 V ac peak to peak. Exercise extreme caution during
unit testing. Death or serious injury could result from electrical shock.
4.1 INTRODUCTION
This section describes the troubleshooting methods and testing procedures that can be used to
identify a faulty board. This section also includes return to service information.
Two troubleshooting methods are described. The first method is to observe fault messages on the
display and take the recommended actions (Figure 4-1 and Table 4-1). If the fault message
approach is unproductive, minimum performance specification tests can be performed to help
identify a defective board. Note that the MPS tests are designed to be performed using ATE. In
many cases manual methods can be designed to still perform the tests.
4.2 LIMITATIONS/SCOPE
If any testing which is required and/or desired falls outside of the scope of what is described,
return the unit to Garmin for repair.
NOTE
All units contains static sensitive components. Observe proper anti-static
procedures during testing.
4.3
TROUBLESHOOTING METHOD I
―
FAULT MESSAGES
The simplest method of troubleshooting is to observe any fault messages that are displayed
(Figure 4-1) and perform the recommended actions given in Table 4-1.
Figure 4-1. Typical Fault Messages
