ABCDEFGHJK
PINS A11 AND B11

PINS J11 AND K11

DM7838CA  DM7838FA

PSEU Connector Data
Figure 201 (Sheet 2)

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747-400 MAINTENANCE MANUAL
 D. Procedure
 S 742-109
 WARNING: MAKE SURE YOU FOLLOW ALL WARNINGS AND CAUTIONS IN

_______ AMM 32-09-03/501. FAILURE TO DO SO COULD RESULT IN INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
 (1)  
Do this Task: Ground Test - Proximity Switch Electronics Unit (PSEU) (AMM 32-09-03/501).

 S 862-096

 (2)  
Remove electrical power if it is not necessary (AMM 24-22-00/201).

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747-400 MAINTENANCE MANUAL
 PROXIMITY SWITCH ELECTRONICS UNIT (PSEU) - REMOVAL/INSTALLATION
_______________________________________________________________
 1.  General_______
 A. This procedure contains two tasks:
 (1)  
The removal of the PSEU

 (2)  
The installation of the PSEU.

 B.
To remove the PSEU these steps are necessary:

 (1)  
Look for PSEU shop faults and make a note of them if it is necessary

 (2)  
Prepare safety-sensitive systems for the air mode

 (3)  
Remove the PSEU from the E1-3 shelf.

 C.
To install the PSEU these steps are necessary:

 (1)  
Install the PSEU on the E1-3 shelf

 (2)  
Do the PSEU operational test.

 D.
The Proximity Switch Electronics Unit (PSEU) is on the E1-3 shelf of the main equipment center. The equipment number for the PSEU is M7838.

 TASK 32-09-03-004-001
 2.  Removal of the PSEU (Fig. 401)___________________
 A. References
 (1)  
24-22-00/201, Manual Control

 (2)  
32-09-02/201, Air/Ground Relay System

 (3)  
IPC 32-61-01 Fig. 2

 (4)  
SSM 32-61-01

 (5)  
WDM 32-61-11

 B.
Access

 (1)  
Location Zone
 117 Left Electrical and Electronics Compartment

 C.
Make a Record of the PSEU Shop Faults (Optional).

 (1)  
Supply electrical power (Ref 24-22-00/201).

 (2)  
Go to SHOP FAULTS from the main menu of the CMC.

 S 974-014

 (3)  
Make a note of the shop faults for the PSEU:

 (a)  
Push the button adjacent to the 32 PSEU SYSTEM display on the shop faults menu.

 S 864-012
 S 864-013
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747-400
MAINTENANCE MANUAL

MAIN EQUIPMENT CENTER

PSEU
A
PSEU Installation
Figure 401

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747-400 MAINTENANCE MANUAL
 (b)
Push the button adjacent to the PSEU display on the CDU.

 (c)  
Write all shop faults that come into view.

 S 864-015
　
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