Garmin APOLLO GX SERIES Service Manual

Contents

Garmin AT Rev --© 2004 Garmin AT GX Service Manual 7-92. Seed Position, Time, and DateSpecification: The GX includes a real time clock (RTC) for time and date information that mustbe set after the system initialization. The seed time/date are required forinitialization of position sensors.Operation: During the normal operation startup sequence, enter the current date, time andseed position on the Date/Time page, or go to the Date/Time page in systemmode and enter the current time, date, and seed position. Refer to the user’smanual or installation manual.Notes: The GPS sensor requires the time, date, and position for proper startup. Theposition can be selected from the database.NAV Test Procedures1. CDI OutputDescription: The CDI output is a differential output intended for driving a meter movementwith a maximum load of 200 ohms.Setup: If the TST-10 test station is not available, connect a standard CDI (or equivalentmeter) to the TO/FROM outputs.Operation: Select the CDI left, mid, and right outputs using the CDI Output page in testmode.Verification: Verify the left/right indication as follows:Left: meter full leftMid: meter centeredRight: meter full rightAlternate: If the TST-10 test station is not available, connect the unit to nominal input supplyvoltage. Connect a 200-ohm load between the CDI+ Right and CDI+ Left outputs.Verification: Verify the differential output voltage between the CDI+ Right and CDI+ Leftoutputs as follows:Left: -150 mV ± 4 mVDCMid: 0 mV ± 2.0 mVDCRight: +150 mV ± 4 mVDCVerify the CDI+ Left output to ground is 2.05 volts ± 0.1 VDC.