Garmin AT
Rev --
8-10
GX Service Manual
© 2004 Garmin AT
GX60/65 Comm Board Replacement
This procedure describes the removal and replacement of the Comm board.
Parts Required
•
221-0401 PAN HEAD PHILIPS, 4-40 x ¼” w/ SPLIT LOCK WASHER, STAINLESS STEEL (10
required)
•
224-0404 UNDERCUT, PAN HEAD PHILIPS, 4-40 x ¼”, 82 DEGREE, STAINLESS STEEL (2
required)
•
415-7002-00 PRINTED CIRCUIT ASSEMBLY, VHF Comm, MAIN BOARD, 6011
•
664-0009 HEAT SINK COMPOUND
Removal
1. Before starting this procedure, fill out a Service Data Sheet if this has not already been done. A
copy is located at the back of this manual.
2. Power the unit off and disconnect power from the unit.
3. Remove the chassis cover (see Chassis Cover Replacement procedure).
4. Remove the bezel assembly (see Bezel Assembly Replacement procedure).
5. Remove the nut and lock washer on the BNC connector at the outside back of the chassis.
6. Unplug the ribbon connector from J606 on the Comm board.
7. Remove the two screws on rear of chassis holding the D-sub connector.
8. Remove the two screws from the transistor Q303 on the Comm board. One is accessed through
hole in shielding.
9. Remove the other eight screws holding the Comm board to the chassis.
10. Remove the Comm board from the chassis.
Replacement
1. Put a light coat of heat sink compound on transistor Q303 heat sink.
2. Place the Comm board (415-7002-00) in the chassis with the BNC connector exiting the hole at
the back of the chassis.
3. Replace the two screws (221-0401) for Q303 on the Comm board. One screw is accessed
through hole in shielding. Use needle-nosed pliers if needed to place the screw.
Torque screws
to 5.0 lb.-in
.
4. Replace the other eight (221-0401) screws holding the Comm board to the chassis.
Torque
screws to 5.0 lb.-in
.
5. Replace the two screws (224-0404) at the back of chassis holding the D-sub connector P400.
Torque screws to 5.0 lb.-in
.
6. Plug in the ribbon cable that goes from J4 on the NAV board into J606. The red side of the ribbon
cable goes towards the front of the radio. The ribbon cable exits each connector towards the
outside of the radio and loops over the connectors to the other board. See Figure 8-4.
Note:
Avoid misplacement of the connectors on the headers.
7. Replace the nut and lock washer on the BNC connector at the back of the chassis.
Summary of Contents for APOLLO GX SERIES
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