Detailed Description; Control/Display Unit (Cdu); Figure 1 Gps 155 Block Diagram - Garmin GPS 155 Repair Manual

Garmin 155 gps maintenance and repair manual

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External Battery Pack:

Sealed package containing rechargable cells, fuse and wiring harness.

1.2

DETAILED DESCRIPTION

Internally, the GPS 155 is divided into six printed circuit boards: the main, RF/IF , altitude decoder,

interface, display, and keypad circuit boards. The block diagram in Figure 1 below shows the interrela-

tionships between major circuits and modules within the GPS 155.

Figure 1

GPS 155 Block Diagram

The Control/Display Unit is an assembly consisting of ten keycaps, keypad board, light pipes optical

lens, front insert panel, vacuum fluorescent display (VFD) and board with drivers, display board shock

mounting grommets and screws, housed in a die cast bezel with a dual concentric rotary switch and

two knobs. The VFD is a 3 row by 20 column unit with variable intensity. This display provides

excellent day and night visibility from wide viewing angles. The front panel provides function selec-

tion and alphanumeric input to the Main Board Assembly via 10 push-buttons and the dual concentric

rotary knob. There are two LEDs behind each keycap, providing backlighting for night time use.

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