S 972-002
 (1)  Write the present leg faults, if it is necessary.
 NOTE: When you supply a new flight leg, you will erase the present
____
 leg faults from the last flight.

 S 862-003
 (2)  
Do this task to make sure the airplane is in the ground mode: "Check of the Air Mode/Ground Mode - Air/Ground Relay System" (Ref 32-09-02/201).

 S 862-129

 (3)  
Make sure the left and center IRU's or the left and right IRU's are on.

 NOTE: The IRU's can be in the ALIGN, NAV or ATT mode.
____
 S 412-004
 (4)  
If one or more engines are in operation and have not stopped since the PSEU FAIL message was shown, do these steps:

 (a)  
Close all the entry doors.

 (b)  
Close all the cargo doors.

 (c)  
Close all the access doors.

 S 862-005
 (5)  
If no engines are in operation, do this task to start one engine as specified for usual operation: "Power Plant Operation (Normal)" (AMM 71-00-00/201).

 S 862-079

 (6)  
Open these circuit breakers in the sequence that follows:

 (a)  
P7, Overhead Circuit Breaker Panel
 1) 7F25, PSEU SECT 1
 2) 7F26, PSEU SECT 2

 S 862-080
 (7)  
Close these circuit breakers in the sequence that follows:

 (a)  
P7, Overhead Circuit Breaker Panel
 1) 7F26, PSEU SECT 2
 2) 7F25, PSEU SECT 1

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 S 862-010
 (8)  Stop for 30 seconds.
 S 742-011
 WARNING: YOU MUST DO THE OPERATIONAL TEST AFTER YOU SUPPLY A NEW FLIGHT
_______ LEG. IF YOU DO NOT DO THE TEST, IT IS POSSIBLE NOT TO FIND A FAILURE THAT IS THERE. THIS CONDITION CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
 (9)
Do this task: "PSEU - Operational Test" (AMM 32-09-03/501).

 S 742-012

 (10)
 Make sure that there is no PSEU FAIL message in the present leg faults.

 S 862-077

 (11)
 If it is necessary, do this task to stop the engines :  "Power Plant Operation (Normal)" (AMM 71-00-00/201).

 S 422-013

 (12)
 If the CDU shows the PSEU FAIL message after you do the operational test, replace the PSEU (AMM 32-09-03/401).

 TASK 32-09-03-862-055
 3.  Erase the PSEU Memory (CMC Ground BITE Test Procedure)______________________________________________________
 A. General
 (1)  
Before you do this procedure, make sure that the electrical power sources supply satisfactory power. Power sources that are unsatisfactory can cause a PSEU FAIL message that will not go away.

 B.
References

 (1)  
AMM 24-22-00/201, Manual Control

 (2)  
AMM 32-09-03/501, Proximity Switch Electronics Unit

 C.
Access

 (1)  
Location Zone
 221 Control Cabin, LH
 222 Control Cabin, RH

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MAINTENANCE MANUAL

PSEU Connector Data
Figure 201 (Sheet 1)

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DM7838FA SEE

UNIT SHELF REAR VIEW LOCATION E1-3
　
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