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C.  Power at 28 volts dc from the battery bus is supplied through the STDBY FLOOD & COMPASS circuit breaker on circuit breaker panel P6.
10.  Observers' Reading Lights
A.  The first observer's reading light is mounted in the entryway sidewall to the right of the first observer's seat. (See figure 1.) The second observer's reading light, when installed, is mounted to the left of the second observer's seat and above the P18 circuit breaker panel. The observers' reading lights are identical to the flight kit lights. The 28-volt ac transfer bus No. 2 supplies power to the observers' reading lights. The light controls are part of each light assembly. (See figure 5.)
11.  Spare Lamp Box
A. A spare lamp box is located on the sidewall forward and to the right of the first officer's seat.
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535  Flight Compartment Lights Simplified Schematic 
Feb 15/72  Figure 5  33-11-0 
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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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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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