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A 737-300/400/500MAINTENANCE MANUAL
(EXAMPLE) FASTENER SHROUD ASEE BOARD CIRCUIT ELECTRICAL CONNECTORS (EXAMPLE) FASTENER SHROUD
PASSENGER SERVICE UNIT (PSU)
(EXAMPLE)
FASTENER (EXAMPLE)
CIRCUIT BOARD
(EXAMPLE)
A
PSU Circuit Board Installation Figure 202
E24868
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A
737-300/400/500MAINTENANCE MANUAL
S 032-018
(3)
Disconnect each electrical connector from the circuit board.
S 032-019
(4)
Remove each screw from each shroud above the circuit board.
S 032-020
(5)
Lift away each shroud.
S 022-021
(6)
Remove the circuit board from the PSU.
(a) Remove each screw that holds the circuit board.
E. Circuit Board Installation
S 422-022
CAUTION: DO NOT TOUCH THE CIRCUIT BOARD BEFORE YOU DO THE PROCEDURE FOR
_______ DEVICES THAT ARE SENSITIVE TO ELECTROSTATIC DISCHARGE. ELECTROSTATIC DISCHARGE CAN CAUSE DAMAGE TO THE CIRCUIT BOARD.
(1) Do this task: Install the ESDS Printed Circuit Boards
(AMM 20-40-12/201).
(a) With the screws, install the circuit board in its position in the PSU.
NOTE: Make sure you do not install screws in the holes for the
____
screws that also hold the shroud.
S 432-023
(2)
Install each shroud with its screws.
(3)
Connect each electrical connector to the circuit board.
(4)
Install the PSU (AMM 25-23-61/201).
S 432-024
S 412-025
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1.
2.
3.
A
737-300/400/500MAINTENANCE MANUAL
PASSENGER SIGNS - DESCRIPTION AND OPERATION
___________________________________________
General
_______
A. Passenger signs give information to persons in the passenger compartment during a flight of the airplane.
B. These signs tell the passengers and attendants when not to smoke, when to go back to their seats, and when to put on their seat belts.
C. For more data about this lighting system, refer to these sources:
(1) SSM 33-25-00 thru 33-25-99
(2) WDM 33-25-11 thru 33-25-99NO SMOKING Signs
________________
A. The NO SMOKING signs tell the passengers and attendants when not to smoke.
(1)
There is a sign in each Passenger Service Unit (PSU) and attendant's station.
(2)
The signs are operated with a switch on the pilot's overhead panel, P5.
(a)
To operate these signs manually, the pilot sets this switch to the on position.
(b)
When the switch is set to the automatic position, these signs come on automatically during takeoffs and landings.
(3)
The incandescent lamps in each NO SMOKING sign operate with the 28 volts ac of electrical power from the No.1 transfer bus.
(a) With the switch set to the automatic position, the signs come on when the landing gear lever is set to the down position. 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：737-300 400 500 AMM 飞机维护手册 灯 LIGHTS(36)
