B.
Access

 (1)  
Location Zones
 117/118 Main Equipment Center
 211/212 Control Cabin

 C.
Prepare to Do the Self Test of the AVM Signal Conditioner

 S 865-043-N00
 (1)  
Supply electrical power (AMM 24-22-00/201).

 S 865-044-N00

 (2)  
Make sure that this circuit breaker on the overhead panel P11 is closed:

 (a)  11K2, VIB MONITOR
 S 015-045-N00
 (3)  
Open the main equipment center access door, 119AL.

 D.
Do the Self-Test of the AVM Signal Conditioner

 S 745-046-N00
 (1) Do these steps to do a self-test of the AVM signal conditioner:
 (a)  Make sure that the VIB indicators on the EICAS maintenance page show 0 |0.25 unit.
 NOTE: If the circuit breaker is closed, the VIB indicators on
____ the EICAS maintenance page will show 0. If the circuit breaker was open, the VIB indicators on the EICAS maintenance page will not show.
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////////////////////////A / PW4000 SERIES /747-400 / ENGINES /MAINTENANCE MANUAL ////////////////////////

AVM SIGNAL CONDITIONER, M118 (E1-1) SEE

AVM SIGNAL CONDITIONER
(EXAMPLE)

Airborne Vibration Monitor (AVM) Signal Conditioner
Figure 502

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M03612
(b)  Make sure that the VIB indicators on the MCDP/MSG maintenance page show 0 |0.25 unit.
 NOTE:____ If the circuit breaker is closed, the VIB indicators on the MCDP/MSG maintenance page will show 0. If the circuit breaker was open, the VIB indicators on the MCDP/MSG maintenance page will not show.
 (c) (d) (e) (f) (g)  Push and release one of the four buttons on the front display of the AVM signal conditioner. 1) If the AVM signal conditioner is blank, do the Fault Isolation procedure that shows for an AVM Indication Problem (FIM 77-00-00/101).The AVM signal conditioner will show Self Test?.Push and release the YES button on the front display of the AVM signal conditioner.The AVM signal conditioner will show the hardware and software versions for 12 seconds, then show Test in progress for approximately 2 seconds.Make sure that the AVM signal conditioner shows Test OK.
 NOTE:____ The AVM signal conditioner passed the self-test. After Test OK, push and release the NO button to show Fault History? on the front display of the AVM signal conditioner. If the AVM signal conditioner is left alone for 5 minutes, the display will then turn off.
 (h)  If the AVM signal conditioner shows XX Faults Display? or is blank, there is a failure of the AVM signal conditioner.
 NOTE:____ XX is the total number of faults.
 1) 2)  If the front display on the AVM signal conditioner is blank, replace the AVM signal conditioner and do the self-test again.If there are XX Faults Display?, do the system test for the Airborne Vibration Monitoring (AVM) System (AMM 77-31-00/201).

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AIRBORNE VIBRATION MONITORING (AVM) SYSTEM - INSPECTION/CHECK
_____________________________________________________________
 1.  General
_______
 A.  This procedure does a continuity and insulation resistance check of the Airborne Vibration Monitoring (AVM) system.
 B.  This check will make sure the electrical wire for the Airborne Vibration Monitoring (AVM) system is in a satisfactory condition.
 TASK 77-31-00-766-001-N00
 2.  Do a Check of the Continuity and the Insulation Resistance
　
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