INTEGRAL PANEL LIGHTS -DIMMER CONTROL UNITS

EFFECTIVITY BEJ ALL  33-13-00 
Page 13 
D633W101-BEJ  Jan 05/2002 

INTEGRAL PANEL LIGHTS -FUNCTIONAL DESCRIPTION -MANUAL ADJUSTMENTS

General
The light intensity for the integral panel lights is adjustable manually from the master bright control (MBC) and the individual panel light controls. You can adjust the light intensity from both controls if the master bright switch (MBS) is in the ON position.
When the master bright switch is ON, the master bright control has full control of the intensity of all the integral panel lights. The individual panel light controls let you bias the light intensity up or down by 20 percent.
When the MBS is off, the individual panel light controls have full control of the panel lights.
You can manually adjust these integral panel lights:
*
P1

*
P2

*
P3

*
P5

*
P7

*
P8

*
P9

*
P10

*
P11

*
P13

*
P14

*
P15

*
P16

*
P18

*
P55.

Power Supply
The master brightness control (MBC) card gets 28v dc from the left main bus.
The dimmer control units for the captain’s integral panel lights get power from these sources:
*
115v ac left transfer bus: usual power source

*
115v ac standby bus: backup power source.

The dimmer control units for other integral panel lights (not shown) get power from these sources:
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115v ac left transfer bus: overhead panel

*
115v ac right transfer bus: glareshield, F/O and observer panels

*
115v ac left main bus, section 1: overhead circuit breaker panel.

The dimmer control units decrease the 115v ac to these values:
*
0 to 5v ac

*
0 to 5.5v ac

*
0 to 6v ac.

EFFECTIVITY BEJ ALL  33-13-00 
Page 14 
D633W101-BEJ  Sep 05/2002 

INTEGRAL PANEL LIGHTS -FUNCTIONAL DESCRIPTION -MANUAL ADJUSTMENTS

The dimmer control units supply power to the integral panel lights. The amount of power the dimmer control units supplies to the integral panel lights usually comes from operator input through the master bright control card. Some integral panel light circuits also get inputs from light sensors through the master bright control card.
See the automatic adjustments training information points section for more information about the light sensors.
The brake accumulator pressure indicator (gage) light also has power when the towing power is ON. This power comes from the towing bus through the captain’s floodlight dimmer control unit (not shown). This lets you adjust the intensity of the indicator with the captain’s floodlight control.
See the flight compartment illumination section for more information about the flight compartment lights that get power from the towing bus (SECTION 33-11).
See the position lights section for more information about the position lights that get power from the towing bus (SECTION 33-43).
See the towing power section for more information about the towing bus (SECTION 24-29).
EFFECTIVITY
BEJ ALL

Manual Brightness Inputs
When the MBS is ON, the MBC adjusts the integral panel lights from full bright to full dim. The individual panel light controls can adjust the light brightness up or down 20 percent from the level set by the MBC.
The master bright control card has a master bright control blend function. The master bright control blend function mixes the inputs from the MBC and the individual panel light control. This is the function that lets you bias the panel lights by 20 percent. The master bright control blend function then sends a single output to the respective dimmer control unit. The dimmer control units then adjust the light intensity of the respective integral panel light.
When the MBS is OFF, the master bright control card disables the master bright control blend function. The individual panel light controls adjust the integral panel lights from full bright to full dim. The master bright control card then sends the output to the respective dimmer control unit. The dimmer control unit then adjusts the light intensity of the related integral panel light.
Standby Power Mode
Critical dimmer control units get power from the 115v ac standby bus when power is not available from the left 115v ac transfer bus. 115v ac standby bus power then goes to the critical dimmer control units. The critical dimmer control units then supply power to the respective panel lights.
33-13-00

Page 15 D633W101-BEJ Sep 05/2002

INTEGRAL PANEL LIGHTS -FUNCTIONAL DESCRIPTION -MANUAL ADJUSTMENTS

When standby power is the power source, you can not adjust the light intensity from the MBC. You can only adjust the light intensity from the related individual panel light control. These integral panel lights and instruments have power when the lights are in the standby mode:
　
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