INTEGRAL PANEL LIGHTS -LIGHTED PUSH-BUTTON SWITCHES
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INTEGRAL PANEL LIGHTS -OPERATION
General
These are the controls for the integral panel lights:
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Outer control of the OVHD/CB light control on the passenger signs/lighting panel for the P5 overhead panel
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Inner control of the OVHD/CB light control on the passenger signs/lighting panel for the P11 circuit breaker panel
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Outer control of the GLARESHIELD PNL/FLOOD light control on the passenger signs/lighting panel for the P7 glareshield panel
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MASTER BRIGHT control on the passenger signs/lighting panel
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MASTER BRIGHT switch on the passenger signs/lighting panel
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Outer control of the FWD PANEL BRIGHTNESS PNL/FLOOD light control on the P14 right sidewall panel for the P3 right forward panel
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Outer control of the FWD PANEL BRIGHTNESS PNL/FLOOD light control on the P13 left sidewall panel for the P1 left forward and P2 center forward panels
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Outer control of the AISLE STAND PNL/FLOOD light control on the aisle stand brightness panel for the P8 aft aisle stand panel.
Operation
You use the controls to adjust the amount of light that comes from the integral panel lights. When the MASTER BRIGHT switch is in the OFF position, you can adjust the lights from fully dim to fully bright.
Master Brightness
With the MASTER BRIGHT switch in the ON position, you set the lighting level for all of the integral panel lights at the same time. You turn the MASTER BRIGHT control to adjust the amount of light that comes from the integral panel lights.
When the MASTER BRIGHT switch is in the ON position, you can use any panel control to adjust the amount of light for the related panel. The range of adjustment is |20 percent.
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777 AIRCRAFT MAINTENANCE MANUAL
INTEGRAL PANEL LIGHTS -OPERATION
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INTEGRAL PANEL LIGHTS -DIMMER CONTROL UNITS
Purpose
The dimmer control units (DCUs) filter and control the voltage that goes to integral panel lights (lighted instruments and lightplate panels) and some floodlights in the flight deck. The units control the voltage based on inputs from controls in the flight deck.
Location
The DCUs are on the P96 overhead dimmer panel and in the flight deck. There are seven units on the P96. There are eleven units in the flight deck at these locations:
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P1 area: two units forward and outboard of the left outboard display unit (not shown)
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P3 area: two units forward and outboard of the right outboard display unit (not shown)
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P9 area: seven units, four on the left and three on the right, are forward and below left and right control display units (not shown).
See the flight compartment section for more information about the dimmer control units and their related light circuits (SECTION 33-10).
Physical Description
The DCUs are LRUs. Each DCU has these parts:
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Electrical connector
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Control card (internal)
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EMI filter (internal)
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Power transformer (internal).
The DCUs are static sensitive.
Functional Description and Interfaces
The DCUs use 115v ac for control and operation. The control card, EMI filter, and power transformer operate together to give any one of these outputs:
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0 to 5v ac
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0 to 5.5v ac
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0 to 6v ac.
The DCUs in the flood light circuits monitor floodlight controls for operator input. Based on the operator input, the DCU adjusts output voltage to the floodlights.
The DCUs in the integral panel light circuits connect to the master brightness control (MBC) card. The card tells the DCUs the intensity for the lights based on operator inputs (panel light and master brightness controls). The card also monitors light sensors and can cause the DCUs related to the aisle stand LCDs to adjust for increased brightness inside or outside of the flight deck.
See the flight compartment illumination section for more information about the operation of the dimmer control units in the floodlight circuits (SECTION 33-11).
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