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Use the cursor select switch to make a selection when the cursor on the display is in an active area. You operate the switch with the thumb. This switch gives a tactile feedback.
Touch Pad
The cursor follows your finger on the display when you move a finger across the touch pad. Each touch pad has hot spots. These hot spots are at each corner of the touch pad. The cursor goes to the corner of the active display when you touch a corner of the touch pad. This gives the operator quick access to frequently used menu selections. In some instances, the cursor automatically moves to the next selection.
Training Information Point
The two CCDs are not interchangeable because the cursor select and cursor location switches are not in the same position.
The manufacturer seals the CCD touch pad to prevent damage from liquid spills.
A glass faceplate over the touch pad prevents damage to the touch pad. The touch pads are impact resistant up to a force of 5 pounds.
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PRIMARY DISPLAY SYSTEM -CURSOR CONTROL DEVICES

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PRIMARY DISPLAY SYSTEM -REMOTE LIGHT SENSOR

Purpose
Two remote light sensors (RLSs) are on the forward part of the glareshield. The sensors face forward. The RLSs measure ambient light with a photodiode sensor and supply an analog signal proportional to the ambient light. The left and right RLS sends data to the respective outboard display unit. The display units use the analog signals for automatic brightness control.
Description
Each sensor weighs less than 1/2 pound. Each has a cable that has all the wires required for electrical power and signal interface. The cable is 84 inches long.
Each RLS has a field-of-view of 60 degrees left, 60 degrees right, 35 degrees up, and 35 degrees down.
Each RLS gets |15v dc from the onside display unit.
Training Information Point
The remote light sensors are interchangeable.
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PRIMARY DISPLAY SYSTEM -REMOTE LIGHT SENSOR

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PRIMARY DISPLAY SYSTEM -COAXIAL COUPLER

General
There are four coaxial couplers on the airplane. Each graphics generator sends a video output to a coaxial coupler. The coaxial coupler splits the signal and sends an output to each of the six display units.
Location
The coaxial couplers are on disconnect brackets outboard of the captain’s and first officer’s outboard rudder pedals. There are two coaxial couplers on the outboard side of each disconnect bracket.
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777 AIRCRAFT MAINTENANCE MANUAL

PRIMARY DISPLAY SYSTEM -COAXIAL COUPLER

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PRIMARY DISPLAY SYSTEM -BRIGHTNESS CONTROLS

Purpose
The brightness controls permit manual brightness control by the flight crew for the display units.
Forward Panel Brightness/Heater Controls
The flight crew forward panel brightness controls, control the brightness on the inboard and outboard DUs. There is a single control for the outboard display units. There are two controls for the inboard display units. The outer knob controls brightness and the inner knob controls the weather radar brightness.
Center Display Control Panel
The center display control panel has two brightness controls. The UPR DSPL control adjusts the brightness of the upper center display unit. The LWR DSPL/WXR has an outer knob and an inner knob. The outer knob adjusts the brightness of the center lower display. The inner knob adjusts the weather radar brightness.
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PRIMARY DISPLAY SYSTEM -BRIGHTNESS CONTROLS

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PRIMARY DISPLAY SYSTEM -DISPLAY SWITCHING PANELS

Purpose
The display switching panels select the alternate positions for display formats.
Operation
There are two NORM positions. The MFD position causes the inboard DU to respond to the selections of the display select panel (DSP). The NAV position forces the inboard DU to show the ND format. In the NAV position, the inboard DU does not respond to DSP inputs.
The PFD position causes the inboard DU to show the PFD format.
　
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