TASK 33-23-00-822-010
 3. Reading Light - Adjustment (Fig. 201)
__________________________
 A. General
 (1)  
If the reading light has circular lens, you can permit the passengers and attendant's to adjust the direction of the light beam. You can also adjust and lock the reading light in its position. Passengers and attendant's cannot change direction of the light beam while the reading light is locked.

 (2)  
If the reading light has a rectangular lens, you adjust where the light beam is pointed. Passengers and attendants cannot adjust the reading light to change the direction of the light beam.

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737-300/400/500MAINTENANCE MANUAL
 B.  References
 (1)  
AMM 24-22-00/201, Manual Control

 (2)  
AMM 25-23-61/201, Passenger Service Units (PSUs)

 (3)  
SSM 33-23-00 thru 33-23-99

 (4)  
WDM 33-23-11 thru 33-23-99

 C.  Access
 (1)  Location Zone
 100 Upper Half of Fuselage

 D.  Procedure
 S 822-004
 (1)  Adjust the reading light.
 (a)  
Supply electrical power (AMM 24-22-00/201).

 (b)  
If the reading light is off, set its switch to the on position.

 (c)  
Examine where the light beam is pointed.

 NOTE: The correct adjustment of a reading light is in the
____ direction that gives the best lighting for a person to read a book. This is at approximately the center of the forward edge of the seat.
 (d)  
Remove electrical power from the light:

 1)  Open each applicable circuit breaker for the reading light and attach the DO-NOT-CLOSE tag: a) On the load control center panel, P18.

 (e)  
Open the PSU or ASU to get access to the rear of the reading light (AMM 25-23-61/201).

 (f)  
READING LIGHT WITH A CIRCULAR LENS; Adjust the direction of the light beam. 1) Use the lever to release the reading light assembly. 2) Move the lens assembly until the reading light is in its

 correct position. 3) Use the lever to lock the reading light in its position.

 (g)  
READING LIGHT WITH A RECTANGULAR LENS; Adjust the direction of the light beam. 1) Loosen the two adjustment nuts on the edge of the

 reflector.
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737-300/400/500MAINTENANCE MANUAL
 2) Move the reflector until the reading light is in the correct position. 3) Tighten the adjustment nuts.
 (h)  Close the PSU or ASU (AMM 25-23-61/201).
 S 712-015
 (2)  Do a test of the light beam adjustment.
 (a)  
Remove each DO-NOT-CLOSE tag. 1) Close each circuit breaker that was opened.

 (b)  
Make sure the reading light is adjusted to give the best lighting for a passenger to read a book.

 NOTE: This is at approximately the center of the forward edge
____
 of the seat.

 (c)  
Set the switch to the usual position.

 (d)  
Remove electrical power if it is not necessary (AMM 24-22-00/201).

 TASK 33-23-00-962-026
 4. PSU Circuit Board - Replacement (Fig. 202)
_______________________________
 A. General
 (1)  Frequently a PSU circuit board can be repaired in the shop with the replacement of a fuse.
 B. References
 (1)  
AMM 20-40-12/201, Electrostatic Discharge Sensitive Devices

 (2)  
AMM 25-23-61/201, Passenger Service Units (PSUs)

 C. Access
 (1)  Location Zone
 100 Upper Half of Fuselage

 D. Circuit Board Removal
 S 012-016
 (1)  Remove the PSU to get access to the circuit board.
 S 022-017
　
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