Honeywell bendis king KLN 94, Maintenance Manual

Page: 10 / 172

BENDIX/KING KLN 94
Page 4-2 15599M00.JA Rev 0, Sept/2000
4.2 BLOCK DIAGRAM THEORY
Figure 4-1 is a block diagram showing the basic signal flow through a KLN 94 GPS RNAV.
4.2.1 POWER BOARD
The Power Board block diagram is shown in Figure 4-2.
The power supply uses a flyback converter circuit to transform the aircraft power bus voltage
(11-33 volts) into the required voltages for the KLN 94’s internal circuitry. The power supply in-
corporates over voltage and short circuit protection to minimize the possibility of damage occurring
in the power supply or other circuitry.
4.2.2 FRONT PANEL ASSEMBLY
The Front Panel block diagram is depicted by Figure 4-3 .
The Front Panel Assembly acts as the unit’s pilot interface. It includes the liquid crystal display
(LCD) with backlighting, control switches, and pushbuttons. Specific boards included within are
the Button Board and the Switch Board.
4.2.3 GPS XPRESS RECEIVER
CAUTION
DO NOT ATTEMPT TO ALIGN OR REPAIR
THE GPS PXPRESS RECEIVER BOARD (P/N
200–08825–0000). THIS BOARD IS NOT A
FIELD SERVICEABLE ASSEMBLY
4.2.4 MAIN BOARD
The Main Board block diagram is depicted by Figures 4-4 , 4-5 , and 4-6 .
The Main Board includes both microprocessors and input/output circuitries. The Bus I/O Board
and Suppressor Boards interface directly with the Main Board.
4.2.5 UNIT INTERCONNECTION
The Unit Interconnection diagram is depicted by Figure 4-7 .
This diagram shows the relationships between the various board connectors within the KLN 94.