(b)  
set the two APU generator switches (APU left and APU right) on the overhead panel to the ON position.

 (c)  
Make sure that the BUS TRANSFER switch is in the AUTO position.

 (d)  
Set the APU GEN 1 switch to the OFF position to do the generator failure simulation.

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
 (e)  
Push the INIT/REF key on the CDU keyboard to show the POS INIT page or PERF INIT page.

 (f)  
Push the LSK adjacent to <INDEX to show the INIT REF INDEX 1/1 page.

 (g)  
Push the LSK adjacent to MAINT> to show the MAINT BITE INDEX 1/1 page.

 (h)  
Push the LSK adjacent to <DFCS to show the DFCS BITE TEST LINE MAINT 1/2 page.

 (i)  
Push the NEXT PAGE key on the CDU keyboard to show the DFCS BITE TEST OVERNIGHT MAINT 2/2 page.

 (j)  
Push the LSK adjacent to <SENSOR VALUES to show the Sensor Values Test Index.

 (k)  
Push the LSK adjacent to <DISCRETE INPUT WORDS to get access to the Discrete Input Words Index.

 (l)  
Push the LSK adjacent to DISINWD 06> from the Discrete Input Words Index.

 (m)  
Make sure that the A side of the pin J4B-30 shows GD on the CDU display.

 (n)  
Set the APU GEN 1 switch to the ON position.

 (o)  
Make sure that the A side of the pin J4B-30 changes from GD to

 28.

 (p)  
Set the APU GEN 2 switch to the OFF position to do the generator failure simulation.

 (q)  
Push the INIT/REF key on the CDU keyboard to show the POS INIT page or PERF INIT page.

 (r)  
Push the LSK adjacent <INDEX to show the INIT REF INDEX 1/1 page.

 (s)  
Push the LSK adjacent to MAINT> to show the MAINT BITE INDEX 1/1 page.

 (t)  
Push the LSK adjacent to <DFCS to show the DFCS BITE TEST LINE MAINT 1/2 page.

 (u)  
Push the NEXT PAGE key on the CDU keyboard to show the DFCS BITE TEST OVERNIGHT MAINT 2/2 page.

 (v)  
Push the LSK adjacent to <SENSOR VALUES to show the Sensor Values Test Index.

 (w)  
Push the LSK adjacent to <DISCRETE INPUT WORDS to get access to the Discrete Input Words Index.

 (x)  
Push the LSK adjacent to DISINWD 06> from the Discrete Input Words Index.

 (y)  
Make sure that the B side of the pin J4B-30 shows GD.

 (z)
Set the APU GEN 2 switch to the ON position.
 (aa) Make sure that the B side of the pin J4B-30 changes from GD to

 28. (ab) Set the GND PWR switch to the ON position to put back the
 ground power.
 (ac) Do this task: APU shutdown (AMM 49-11-00/201).
 (ad) Push the INIT/REF key on the CDU keyboard to get out of the
 BITE.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 I. Bus Isolation Test
 S 745-004
 (1)  Do the bus isolation test:
 (a)  
Set the meter selector switch for the Transformer Rectifier Unit (TRU) on the Pilots' Overhead Panel, P5-13, to the TR2 position.

 (b)  
Open the AFCS B FCC DC circuit breaker on the P6-2 Circuit Breaker Panel.

 (c)  
Open the TR2 and TR3 circuit breakers on the P6-4 Circuit Breaker Panel.

 (d)  
Make sure the DC voltmeter on the Pilots' Overhead Panel, P5-13 reads 22 to 30 V dc.

 (e)  
Push the INIT/REF key on the CDU keyboard to show the POS INIT page or PERF INIT page.

 (f)  
Push the LSK adjacent to <INDEX to show the INIT REF INDEX 1/1 page.

 (g)  
Push the LSK adjacent to MAINT> to show the MAINT BITE INDEX 1/1 page.
　
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