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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
33-11-00-013
Purpose
The control stand panel lights provide the illumination for the
instruments and panels for the flight crew.
Functional Description
You control the intensity of instrument and panel illumination by
the panel variable transformer on the P8 panel. Turn the
transformer knob clockwise to give brighter lights. Turn the
transformer knob all the way counterclockwise to turn the lights
off.
Power from the variable transformer goes to the auto
transformer in the J19 junction box.
Power from the variable transformer goes to the auto
transformer in the P8 panel.
From the auto transformer, 0 - 5v ac goes to the instrument and
panel lights on P8 panel.
Relay R425 is normally energized. When normal 28v ac power
is not present, the relay deenergizes. This connects the 28v ac
standby bus to the instrument and panel lights on P8 panel.
Circuit breakers on the panels provide protection for the
system.
LIGHTS - INSTRUMENT AND PANEL LIGHTS - CONTROL STAND - FUNCTIONAL DESCRIPTION
EFFECTIVITY
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Page 20
D633A101-GUN Oct 10/2002
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
33-11-00-014
LIGHTS - INSTRUMENT AND PANEL LIGHTS - CONTROL STAND - FUNCTIONAL DESCRIPTION
LIGHTS - INSTRUMENT AND PANEL LIGHTS - CONTROL STAND - FUNCTIONAL DESCRIPTION
EFFECTIVITY
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Page 21
D633A101-GUN Feb 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
33-11-00-014
Purpose
The overhead panel lights provide the illumination for the
instruments and panels for the flight crew.
Functional Description
You control the intensity of instrument and panel illumination by
the panel variable transformer on the P5 panel. Turn the
transformer knob clockwise to give brighter lights. Turn the
transformer knob all the way counterclockwise to turn the lights
off.
Power from the variable transformer goes to the auto
transformer in the P6 circuit breaker panel. From the auto
transformer, 0 - 5v ac goes to the instrument and panel lights on
P5 panel.
Circuit breakers on P6 panel provide protection for the system.
LIGHTS - INSTRUMENT AND PANEL LIGHTS - OVERHEAD PANEL - FUNCTIONAL DESCRIPTION
EFFECTIVITY
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Page 22
D633A101-GUN Oct 10/2002
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
33-11-00-015
LIGHTS - INSTRUMENT AND PANEL LIGHTS - OVERHEAD PANEL - FUNCTIONAL DESCRIPTION
LIGHTS - INSTRUMENT AND PANEL LIGHTS - OVERHEAD PANEL - FUNCTIONAL DESCRIPTION
EFFECTIVITY
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Page 23
D633A101-GUN Feb 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
33-11-00-015
Purpose
Standby lights supply light to instruments that are necessary for
flight safety.
The diagram below shows the standby circuit for systems on
the P8 panel. Please refer to your wiring diagrams for other
lights on the standby system.
Functional Description
When transfer bus 2 cannot supply power to the lights, the lights
get power from the standby bus. When relay R425 cannot
energize, the standby bus connects to the standby transformer,
T362. The standby transformer supplies the 5v ac to the lights
for the system.
LIGHTS - INSTRUMENT AND PANEL LIGHTS - STANDBY LIGHTING - FUNCTIONAL DESCRIPTION
EFFECTIVITY
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Page 24
D633A101-GUN Oct 10/2002
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
33-11-00-021
LIGHTS - INSTRUMENT AND PANEL LIGHTS - STANDBY LIGHTING - FUNCTIONAL DESCRIPTION
LIGHTS - INSTRUMENT AND PANEL LIGHTS - STANDBY LIGHTING - FUNCTIONAL DESCRIPTION
EFFECTIVITY
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Page 25
D633A101-GUN Feb 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
33-11-00-021
Operation
The OFF-BRIGHT control for the control stand (P8 panel), main
panel (P3 panel) instrument and panel lights (P5 panel) adjusts
the intensity the lamps.
Functional Description
The OFF-BRIGHT control is a variable transformer. The control
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