Garmin APOLLO GX SERIES, Service Manual

Page: 97 / 166

© 2004 Garmin AT GX Service Manual 8-1
Chapter 8. Replacement Procedures
Purpose
This section provides replacement procedures for all serviceable assemblies and parts. These
include the battery, battery holder, bezel assembly, chassis, Comm board, display, fuse, GPS board,
keypad, lens, chassis cover, NAV board and soft keys.
Preliminary Data
Prior to performing any repair or testing, fill out the appropriate fields of the Service Data Sheet. A
copy is located at the back of this manual. This will be used when service is completed to reenter
customer configuration and perform final test and inspection.
Board Locations
All physical references to the units are as though the user were facing the display.
Inside the chassis are different circuit boards depending on the model number. Refer to Figure 8-1
and Figure 8-2.
The GX55 and GX50 have one circuit board on the right-hand side with a small circuit board on top.
This is the navigation circuit board with the GPS receiver on top.
In the GX60 and GX65, in addition to the NAV board, there is a Comm board on the left with RF
shielding and a small circuit board positioned vertically on top. This is the Comm board with the audio
board vertically mounted on it.
Behind the front bezel assembly with the keypad and smart keys are two stacked boards. The smaller
is the display board, which is attached to the display itself. The larger one has the rotary knobs
attached and is the display controller board. These two boards must be replaced together.
Warning
High voltage up to 200VDC is present on the display board. Use extreme caution when
performing maintenance procedures with the cover removed.
Caution
ESD precautions must be followed at all times when handling components or circuit boards.
When working on the unit, you must use a grounded wrist strap. Circuit boards or components
must only be carried in a nonconductive, anti-static bag. Reference EIA Standard # EIA-625.