Garmin GNC 420, Руководство по обслуживанию

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Page iv 400 SERIES MAINTENANCE MANUAL
P/N 190-00140-05 Rev. C
SECTION 3
TROUBLESHOOTING
Paragraph Page
3.1 TROUBLESHOOTING EQUIPMENT ..................................................................... 3-1
3.2 TROUBLESHOOTING ORDER.............................................................................. 3-1
3.3 TROUBLESHOOTING PROCEDURES ................................................................. 3-2
3.3.1 Fuses............................................................................................................... 3-2
3.3.2 Power Supply Checks ..................................................................................... 3-4
3.3.2.1 Current Measurements.................................................................................... 3-4
3.3.2.2 Com Board ..................................................................................................... 3-5
3.3.2.3 Glideslope Board............................................................................................. 3-6
3.3.2.4 Nav Board ....................................................................................................... 3-6
3.3.3 Processor Clock Check ................................................................................... 3-6
3.3.3.1 Internal Clock Check  Main Processor........................................................... 3-6
3.3.3.2 Internal Clock Check

GPS Processor ........................................................... 3-6
3.4 STATIC MESSAGES .............................................................................................. 3-7
3.5 TESTING FAILURES............................................................................................ 3-10
3.6 EXTERNAL CONNECTORS ................................................................................ 3-15
3.7 CONNECTOR I/O DESCRIPTIONS ..................................................................... 3-15
3.8 BLOCK DIAGRAM ................................................................................................ 3-15
SECTION 4
DISASSEMBLY AND ASSEMBLY
Paragraph Page
4.1 INTRODUCTION................................................................................................... 4-1
4.2 REQUIRED TOOLS .............................................................................................. 4-1
4.3 NAV DATA CARD REMOVAL AND INSERTION.................................................. 4-2
4.4 UNIT DESIGN ...................................................................................................... 4-3
4.5 DISASSEMBLY PROCEDURE ............................................................................. 4-3
4.5.1 Remove the Top Cover ................................................................................... 4-3
4.5.2 Remove the CDU Assembly ........................................................................... 4-3
4.5.2.1 Disassemble the CDU Assembly ................................................................... 4-4
4.5.3 Separate the Main and Nav Chassis............................................................... 4-4
4.5.4 Remove Faulty Boards from the Main Chassis Top Cavity ............................ 4-5
4.5.5 Remove Faulty Boards from the Main Chassis Underside Cavity................... 4-5
4.5.6 Remove Faulty Boards from the Nav Chassis ............................................... 4-6
4.6 REASSEMBLY ...................................................................................................... 4-7
4.7 MEMORY BATTERY REPLACEMENT................................................................. 4-7
4.7.1 Remove the Memory Battery........................................................................... 4-8