Garmin GPS 155 Repair Manual

Also see for GPS 155: Pilot's guide addendum

Garmin GPS 155 Repair Manual Manual pdf 21 page image

d. Using a slight downward pressure, rotate the tool away from the chip carrier until the corner of thechip lifts away from the chip carrier socket.e. Repeat on opposite extraction slot and lift chip out of chip carrier socket.5. Inspect the ROM socket to ensure that the contacts and case are in good condition.6. Insert the new ROM into the socket so that the beveled corner of the ROM chip aligns with the beveled cornerof the socket (see Figure 6). Make certain that the ROM is well seated!7. Hold the CLR key down while rotating the power/dimmer knob clockwise from the ‘off’ position. Verify that theSelf Test Page is displayed (shows the software version number and copyright notice). Also, press the MSG keyto verify that the “Stored data lost” message appears on the Message Page and the “ROM failed” messagedoes not appear. (Failure to clear memory after ROM replacement can cause unpredictable operating problems.)8. Turn the GPS 155 off.9. Install the bottom cover by reversing the steps followed in Section 3.1.10. Connect an outside antenna to the GPS 155, turn the unit on and allow it to recollect almanac data as describedabove. This process is complete when the “Collecting data” message is no longer displayed on the MessagePage.18Figure 9ROM Removal