A

757
MAINTENANCE MANUAL

 S 845-012

 CAUTION:_______ DO NOT TOUCH THE MASTER WARNING MODULE BEFORE YOU DO THE
 PROCEDURE FOR DEVICES THAT ARE SENSITIVE TO ELECTROSTATIC
 DISCHARGE.  ELECTROSTATIC DISCHARGE CAN CAUSE DAMAGE TO THE

 MASTER WARNING MODULE.
 (2)  
Do the procedure for devices that are sensitve to electrostatic discharge (AMM 20-41-01/201).

 S 035-013

 (3)  
Remove the master warning module, M618, from the WEU, P51 panel, and replace with the shorting module (AMM 31-51-04/401).

 S 865-581

 (4)  
Close and then open the P11 panel circuit breakers that follow within five seconds:

 (a)  
11B18, WARN ELEX B

 (b)  
11J33, WARN ELEX A

 S 755-030
 (5)  On the WEU BITE module, make sure that the two power supply fault indicators show a yellow fault ball.
 NOTE: The left fault indicator identifies a PSU B, M621, failure.
____ The right fault indicator identifies a PSU A, M616, failure.
 S 485-018
 (6)  
Remove the shorting module and replace with the master warning module (AMM 31-51-04/401).

 S 865-019

 (7)  
Close the P11 panel circuit breaker that follows:

 (a)  11J33, WARN ELEX A
 S 865-020
 (8)  Push the POWER SUPPLY RESET switch on the P51 panel.
 (a)  Make sure that the PSU A failure indicator shows black.
 S 865-021
 (9)  Close the P11 panel circuit breaker that follows:
 (a)  11B18, WARN ELEX B
 S 865-582
 (10) Push the POWER SUPPLY RESET switch on the P51 panel.
 (a)  Make sure that the PSU B failure indicator shows black.
  ú

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 ALL  ú ú 03 Page 503 ú Jan 20/99

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757 MAINTENANCE MANUAL
 S 755-091
 (11)
 Make sure that the two hexadecimal indicators on the WEU BITE module show the hex code 4F.

 S 865-051

 (12)
 Open these P11 panel circuit breakers:

 (a)  
11B18, WARN ELEX B

 (b)  
11J33, WARN ELEX A

 S 865-052
 (13) Push the STATUS switch on the EICAS DISPLAY select panel.
 (a)  Make sure the EICAS message, WARN ELEX, shows on the bottom display when L and R are selected on the EICAS COMPUTER switch.
 S 865-054
 (14) Close this P11 panel circuit breaker:
 (a)  11J33, WARN ELEX A
 S 755-033
 (15)
 Make sure the EICAS message, WARN ELEX, stays on.

 S 865-056

 (16)
 Close this P11 panel circuit breaker:
　
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