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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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Purpose
The flight crew uses the control display unit (CDU) to put in flight
data and to select displays and modes of operation. They also
use the CDU to start ADIRU alignment. You use the CDU to do
tests of the FMCS and other systems.
There are two CDUs in the airplane. They are functionally and
physically interchangeable.
Physical Description
The CDU weighs 9 pounds (4.1 kg).
There are holes in the chassis for cooling air. The equipment
cooling system supplies cooling for the CDUs. Keep dust and
dirt build-up from the vent and surfaces. The procedures to
clean the CDU are in the maintenance practices section.
The CDU has these annunciators:
* Fail
* CALL
* MSG (message)
* OFST (offset).
The annunciators each use a two-lamp circuit board assembly.
Each board assembly is line replaceable.
The execute (EXEC) key is on the right of the CDU. This key has
a lamp assembly with two lamps. The lamp assembly is line
replaceable.
The lighted switch panel is line replaceable. Six screws hold the
panel in place.
CAUTION: FAILURE TO OBSERVE ELECTROSTATIC
DISCHARGE PRECAUTIONARY PROCEDURES
WHEN TOUCHING, REMOVING, OR INSERTING
PARTS OR ASSEMBLIES MAY RESULT IN
DEGRADATION OR FAILURE OF THE CONTROL
DISPLAY UNIT.
Training Information Point
If you remove CDU 2, install the ground lock assemblies on the
landing gear. Put the control lever for the landing gear in the
OFF position.
CAUTION: MAKE SURE THAT YOU INSTALL THE GROUND
LOCK ASSEMBLIES ON THE LANDING GEAR
BEFORE YOU MOVE THE CONTROL LEVER FOR
THE LANDING GEAR. YOU WILL DAMAGE THE
AIRPLANE IF YOU RETRACT THE LANDING GEAR
WHILE THE AIRPLANE IS ON THE GROUND.
FMCS - CONTROL DISPLAY UNIT
EFFECTIVITY
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FMCS - CONTROL DISPLAY UNIT
FMCS - CONTROL DISPLAY UNIT
EFFECTIVITY
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THIS PAGE IS INTENTIONALLY LEFT BLANK
FMCS - CONTROL DISPLAY UNIT
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
General
The LCD CDU has these sub-assemblies:
* Low voltage power supply
* Rear connector filter assembly
* Processor and interface circuit card assembly
* LCD module
* Backlight assembly
* Lighted switch panel.
Power Supplies
The low voltage power supply module in the CDU receives 115v
ac, 400Hz, single phase power from the airplane electrical
system. It provides the following operating voltages within the
LCD CDU:
* +5v dc
* +12.7v dc
* -12.7v dc
* +26v dc
* +28v dc
* Switched +28v dc (used for the backlight and LCD heaters).
The airplane master dim and test circuits supply 28v dc to the
CDU for annunciator power and lamp test. Also, 5v ac power is
used for the lighted switch panel lighting.
Rear Connector Filter Assembly
The CDU receives data on up to seven ARINC data buses and
four discrete inputs. Output data is sent over two ARINC data
buses and one discrete output. All input and output data goes
through the rear connector filter assembly (RCFA) which
provides electromagnetic interference (EMI) protection.
Processor/Interface Circuit Card
The processor and interface circuit card (P&I CCA) provides all
of the control and external interface circuitry for the CDU. It
provides the following functions:
* Read lighted switch panel inputs to determine CDU modes/
inputs
* Receive ARINC inputs from other airplane systems
* Read and interpret airplane discrete inputs
* Generate CDU fail output discrete
* Control CDU annunciator operation
* Send ARINC outputs to FMCS
* Communicate with other airplane sub-systems
* Generate data for LCD and backlight assembly
* Perform BITE.
LCD Module
The LCD module provides the display of 24 columns and 14
rows. It is a non-light emitting device that requires a separate
light source (backlight assembly) to make the display viewable.
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