Garmin GNC 420 Maintenance Manual page 12

Figure
2-1 Com Chassis Nut................................................................................................. 2-1
2-2 Signal And Load Drawing-J1 (Sheet 1 of 2) ........................................................ 2-3
2-3 Signal And Load Drawing-J1 (Sheet 2 of 2) ........................................................ 2-5
2-4 Signal And Load Drawing-J2 ............................................................................... 2-7
2-5 Signal And Load Drawing-J6 ............................................................................... 2-9
3-1 Main Board Fuse Locations ................................................................................. 3-2
3-2 Com Board Fuse Location/F600.......................................................................... 3-3
3-3 Com Board Fuse Location/F600 (Replaced by R611)......................................... 3-3
3-4 Nav Board Fuse Locations .................................................................................. 3-4
3-5 Processor Location (Main Board) ........................................................................ 3-7
3-6 External Connectors .......................................................................................... 3-15
3-7 400 Series Block Diagram ................................................................................. 3-17
4-1 Nav Data Card Installation And Removal ............................................................ 4-2
4-2 Memory Battery Location (Main Board) ............................................................... 4-7
5-1 40dB Attenuator Circuit........................................................................................ 5-3
5-2 Com Setup Page ................................................................................................. 5-9
5-3 R558 (Com Board)............................................................................................. 5-11
5-4 Test Pages......................................................................................................... 5-13
5-5 Modulation Measurement .................................................................................. 5-16
5-6 VOR/LOC/GS CDI Test Page ............................................................................ 5-32
5-7 Main Lighting and Main Analog Test Pages ...................................................... 5-44
5-8 GPS Test Page.................................................................................................. 5-45
5-9 Main CDI/OBS Configuration Test Page ........................................................... 5-47
5-10 Main Discrete Outputs Test Page...................................................................... 5-49
5-11 Main Discrete Inputs Test Page......................................................................... 5-51
5-12 Main Status/Loopback Test Page...................................................................... 5-52
5-13 Main CDI/OBS Configuration Page ................................................................... 5-54
7-1 Sub-Assembly, GNS 430 (Dwg. No. 015-00280-XX, Rev. P).............................. 7-3
7-2 Main Chassis Assembly, GNS 430(A) (Dwg. No. 015-00283-00, Rev. Q) .......... 7-5
7-3 Nav Chassis Assembly, GNC 400 (Dwg. No. 015-00282-00, Rev. K)................. 7-7
7-4 GNC 4XX CDU Assembly (Sheet 1 of 2) (Dwg. No. 015-00281-XX, Rev. F) ...... 7-9
7-4 GNC 4XX CDU Assembly (Sheet 2 of 2) (Dwg. No. 015-00281-XX, Rev. F) .... 7-11
7-5 Sub-Assembly, GNC 420 (Dwg. No. 015-00506-XX, Rev. N) ........................... 7-13
7-6 Main Chassis Assembly, GNC 420(A) (Dwg. No. 015-00283-01, Rev. J ) ........ 7-15
7-7 Sub-Assy, GNC 420 Nav Chas, W/O Nav (Dwg. No. 015-00282-01, Rev. E ). 7-17
7-8 Sub-Assy, GNC 420A (Dwg. No. 015-00837-XX, Rev. A ) ................................ 7-19
7-9 Main Chassis Assembly, GPS 400 (Dwg. No. 015-00283-03, Rev. J) .............. 7-21
7-10 Assy Dwg, GPS 400 (Dwg. No. 015-00504-XX, Rev. G)................................... 7-23
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P/N 190-00140-05
LIST OF FIGURES
400 SERIES MAINTENANCE MANUAL
Page
Rev. C