Garmin 155XL Maintenance Manual page 4

3.5 TROUBLESHOOTING ............................................................................................... 3-6
3.5.1 Table Notes ............................................................................................................... 3-7
3.6 EXTERNAL CONNECTORS...................................................................................... 3-8
3.7 INTERCONNECT DIAGRAM ................................................................................... 3-10
4.1 INTRODUCTION ....................................................................................................... 4-1
4.2 REQUIRED TOOLS ................................................................................................... 4-1
4.3 DISASSEMBLING THE UNIT .................................................................................... 4-1
4.3.1 Removing the Covers................................................................................................. 4-1
4.3.2 Control/Display Unit ................................................................................................... 4-2
4.3.3 Removing the Altitude Decoder Chassis Subassembly.............................................. 4-2
4.3.4 Interface Board Removal ........................................................................................... 4-2
4.3.5 CPU Board Removal.................................................................................................. 4-3
4.3.6 GPS Receiver Assembly Removal and Disassembly ................................................. 4-3
4.3.7 Power Switch Assembly Removal .............................................................................. 4-4
4.3.8 Rotary Switch Assembly Removal ............................................................................. 4-4
4.3.9 Display Module Assembly .......................................................................................... 4-4
4.3.10 Remote Battery Pack and Charger Disassembly ....................................................... 4-5
4.4 REASSEMBLY........................................................................................................... 4-5
5.1 INTRODUCTION ....................................................................................................... 5-1
5.2 TEST EQUIPMENT.................................................................................................... 5-1
5.3 MEMORY BATTERY REPLACEMENT ...................................................................... 5-2
5.4 TESTING ................................................................................................................... 5-3
5.4.1 Test Setup ................................................................................................................. 5-3
5.4.2 Test Procedure .......................................................................................................... 5-3
ii
TABLE OF CONTENTS
(Continued)
Section 4
DISASSEMBLY AND REASSEMBLY
Section 5
TESTING
190-00067-25 Rev D