Garmin 155XL Maintenance Manual page 29

11. Unsolder BNC connector from GPS Receiver Board.
12. To remove BNC connector from casting, remove four screws (5) from casting and pull connector out.
13. Remove GPS Receiver Board from casting.
4.3.7 Power Switch Assembly Removal (Figure 7-3)
1. Remove Covers as described in paragraph 4.3.1.
2. Remove CDU as described in paragraph 4.3.2.
3. Remove CPU Board Sub-Assembly as described in paragraph 4.3.5.
4. Remove Coupling Sleeve (6) by removing Pivot Pin Screw (7).
5. Remove 7/16" Hex Nut (8) securing Power/Dimmer Switch to Chassis.
6. Slide Power/Dimmer Switch out of chassis mounting hole.
4.3.8 Rotary Switch Assembly Removal (Figure 7-4)
1. Remove covers as described in paragraph 4.3.1.
2. Remove CDU as described in paragraph 4.3.2.
3. Remove two Rotary Switch Knobs by loosening two Set Screws (1) on Inner Knob (2).
4. After removing Inner Knob, gently pull outer knob off Rotary Switch Shaft.
5. Disconnect Rotary Switch Wiring Harness from Connector on Display Board.
6. Remove ½" hex nut securing Rotary Switch to CDU.
7. Push rotary switch assembly out of back of Control/Display Unit.
4.3.9 Display Module Assembly Removal (Figure 7-4)
1. Remove Covers as described in paragraph 4.3.1.
2. Remove CDU as described in paragraph 4.3.2.
3. Disconnect Rotary Switch Wiring Harness from Connector on Display Board.
4. Remove four screws (3) that secure Display Board to Bezel.
5. Carefully pull Display Board away from CDU bezel, disengaging it from Keypad Board
Connector.
4-4 190-00067-25 Rev D