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Page 1-6 400 SERIES MAINTENANCE MANUAL
Rev. C P/N 190-00140-05
1.5.5 Glideslope Board
The Glideslope Board contains a processor controlled Glideslope Receiver which operates from
329.15 MHz to 335.00 MHz in 150 kHz increments for 40 Glideslope channels.
1.5.6 Inverter Board
The Inverter Board supplies high voltage for display operation.
1.5.7 CDU Assembly
The main components of the CDU Assembly are the Liquid Crystal Display (LCD), Keyboard
Assembly, and the Interface Board. The display portion consists of a 3-color RGB DSTN type
LCD, 128 x 240 pixels. The keyboard assembly consists of the snap-dome keys, photocell and
LED’s for backlighting display operation. The Interface Board is simply an interconnect
containing no active components. Unit switches and volume pots are mounted in the CDU.
1.5.8 Map Board
The Map Board is physically connected to the Main Board via P16. The Map Board consists of a
map data storage device (ROM or flash). The map storage device contains base map data used to
store topographical information (highways, lakes, rivers, and railroads).