535 Flight Compartment Lights Simplified Schematic
Feb 15/72 Figure 5 33-11-0
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BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
CONTROL CABIN LIGHTING - TROUBLE SHOOTING
1. General
A. Trouble shooting the control cabin lighting circuits is easily accomplished since most circuits have more than one light. Comparison with other lights on the same circuit enables personnel to quickly determine whether a bulb is burned out or if a transformer or switch is faulty. Trouble shooting control cabin lighting problems which disable the entire lighting circuit is best accomplished by making voltage checks at the circuit breakers, transformers or switches. Refer to the Wiring Diagram Manual for the location of secondary circuit breakers, transformers and specific instruments or lights on a circuit.
B. Ensure the variable transformer control is positioned to provide maximum brightness before assuming an entire circuit is inoperative. Turning the variable transformer control to the dim or off position reduces the circuit voltage sufficiently for relamping, replacing lightplates or instruments. When replacing instruments, ensure associated circuit breakers are opened or system is inoperative before removing electrical connectors. Spare bulbs are located in a box mounted on the right sidewall adjacent to the copilot's seat. The following trouble shooting chart lists the more common type of lighting problems which may occur and the procedures for isolating the faulty component.
2. Control Cabin Lighting Trouble Shooting Chart
TROUBLE PROBABLE CAUSE ISOLATION PROCEDURE REMEDY
Panel light Burned out bulb or Observe other panel lights on Replace light plate.
inoperative transformer circuit are operative. If OK, bulb is faulty. If other lights on circuit off, transformer is probably faulty Replace transformer
Instrument light Burned out bulb or Observe other instrument lights Replace instrument.
inoperative transformer on circuit are operative. If OK, bulb is faulty. If other lights on circuit off, transformer is probably faulty Replace transformer
Standby instrument Burned out bulb or Observe other instrument lights Replace instrument.
light inoperative transformer or faulty relay on circuit are operative. If OK, bulb is faulty. If other lights on circuit off, open CAPT 28V Primary Circuit Breaker. If lights OK, transformer T162 faulty. If lights still inoperative, relay R237 is faulty. Replace transformer. Replace relay.
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Nov 15/78 33-11-0
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BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
TROUBLE PROBABLE CAUSE ISOLATION PROCEDURE REMEDY
Floodlight Burned out bulb or Observe other panel lights on Replace floodlight.
inoperative transformer circuit are operative. If OK, floodlight is faulty. If other lights on circuit off, transformer is probably faulty Replace transformer
Fluorescent light Burned out bulb, Rotate BACKGROUND control Relamp fluorescent
inoperative ballast or switch to maximum bright position. Observe other fluorescent light on circujit are operative. If OK, relamp fluorescent lights, if still not OK, replace ballast. If all lights inoperative, replace switch light. Replace ballast. Replace switch
Standby light Burned out bulb or Relamp standby light. Open Relamp light.
inoperative faulty background lights and diode module M560 BKGRD circuit breaker and check that STBY FLOOD & COMPASS circuit breaker is closed on load control center P6. Observe standby lights illuminate. If OK, bulb was faulty. If all lights are off, M560 module is probably faulty Replace M560 module
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