(b)  
If the sensor inductance for the target far state is greater than 5.0 millihenries or less than 4.7 millihenries, refer to FIM 32-61-00/101 to correct the problem.

 S 865-045
 (6)  
Lower the airplane from the jacks (AMM 07-11-01/201), if it is no longer necessary.

 (7)  
Install the PSEU (AMM 32-09-03/401).

 S 865-047

 (8)  
Put the safety-sensitive systems back to their initial conditions (AMM 32-09-02/201).

 S 865-046
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 S 865-048
 (9) 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) CIRCUIT CARD -
_______________________________________________________ REMOVAL/INSTALLATION
____________________
 1.  General
_______
 A.  This procedure contains these two tasks:
 -
The removal of PSEU circuit cards

 -
The installation of PSEU circuit cards.

 B.  
The PSEU circuit cards are installed in the PSEU. The PSEU is installed on the E1-3 shelf of the main equipment center.

 C.  
When shop faults show a circuit card does not operate, you can use this procedure to replace that card. You must do the procedure to find the shop faults before you remove the PSEU.

 TASK 32-09-04-004-001
 2.  Remove the Circuit Card
_______________________
 A.  References
 (1)  
AMM 20-41-02/201, Electrostatic Discharge Sensitive Devices

 (2)  
AMM 32-09-03/401, Proximity Switch Electronics Unit

 B.  
Access

 (1)  
Location Zone 117 Left Electrical and Electronics Compartment

 C.  
Procedure (Fig. 401)

 S 814-004
 (1)  Make sure you do the procedure to look for shop faults before you remove the PSEU (AMM 32-09-03/401).
 NOTE: This procedure will show you the circuit card that does not
____
 operate.

 S 014-003
 (2)  Remove the PSEU (AMM 32-09-03/401).
 S 914-005
 CAUTION: DO NOT TOUCH THE CIRCUIT CARDS BEFORE YOU DO THE PROCEDURE FOR
_______ DEVICES THAT ARE SENSITIVE TO ELECTROSTATIC DISCHARGE. ELECTROSTATIC DISCHARGE CAN CAUSE DAMAGE TO THE CIRCUIT CARDS.
 (3)  Do the procedure for devices that are sensitive to electrostatic discharge (AMM 20-41-02/201).
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747-400 MAINTENANCE MANUAL
COVER
SCREW (18 LOCATIONS)
A4 
A1  A2  A3  A5  A6 A7  A8 A9  A10 
A11 
A12 
A13 
A14 
PSEU 
PSEU Circuit Card Installation NOTE:____ SEE TABLE 1 FOR CIRCUIT CARD NAMES Figure 401

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747-400 MAINTENANCE MANUAL
 S 024-002
 (4) Remove the applicable circuit card.
 NOTE: The circuit card table shows the cards that are in the
　
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