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190-00067-25 Rev D 4-1
SECTION 4
DISASSEMBLY AND REASSEMBLY
The GPS 155XL contains static sensitive components. Observe proper anti-static
procedures while repairing the unit. To avoid damaging the GPS 155XL’s
circuit boards and assemblies, carefully follow the procedures in this section.
Remove the NavData card before disassembling the unit.
4.1 INTRODUCTION
This section contains the instructions for removing the major assemblies of the unit. Reassembly instructions are
given in paragraph 4.4. Disassemble the unit only to the extent necessary to remove and replace parts or
assemblies. Replaceable parts and assemblies are listed in Table 6-1.
4.2 REQUIRED TOOLS
Standard shop equipment is used to disassemble and assemble the unit.
4.3 DISASSEMBLING THE UNIT
4.3.1 Removing the Covers (Figure 7-1)
1. Remove four screws (1) securing the Top Cover (2).
2. Slide Top Cover towards the rear approximately 1/4” until the retaining lip is fully exposed. Lift off
Cover.
3. Carefully turn unit over.
4. Remove two screws (3) retaining the Bottom Cover (4).
5. Slide Bottom Cover towards the rear approximately 1/4” until the retaining lip is fully exposed and
remove.