S 865-044

 (13)
 Stop engine No. 1 (AMM 71-00-00/201).

 D. Do a test of the control circuits for engine No. 2.
 S 865-014
 (1)  Start the No. 2 engine (AMM 71-00-00/201).
 (a)  
Move the selector switch on the ac meter to the GEN 2 position.

 (b)  
Make sure the DRIVE or LOW OIL PRESSURE light on the P5-5 panel goes off.

 (c)  
Momentarily push the ERASE button on the M238 annunciator module.

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737-300/400/500MAINTENANCE MANUAL
 S 865-031
 (2)  
Set the GEN 2 switch to the OFF position.

 S 225-018

 (3)  
Do a check of the voltage:

 (a)  
Push the RESID VOLTS switch.

 (b)  
Make sure the ac voltmeter reads 10 to 21 volts.

 S 865-019
 (4)  
Set the GEN 2 switch to the ON position.

 S 225-020

 (5)  
Make sure the ac voltmeter reads 115 |5 volts ac.

 NOTE: The control (field) relay has closed when the voltmeter
____
 reads 115 |5 volts ac.

 S 215-021
 (6)  Make sure these lights are off:
 (a)  
No. 1 TRANSFER BUS OFF

 (b)  
No. 2 TRANSFER BUS OFF

 (c)  
No. 2 BUS OFF

 (d)  
No. 2 GEN OFF BUS.

 S 225-022
 (7)  
Make sure the frequency is 400 |5 Hz.

 S 215-044

 (8)  
Make sure the FF, LV, HV, and MT lights on the M238 annunciator panel are off.

 S 865-045

 (9)  
Stop engine No. 2 (Ref 71-00-00/201).

 E.
Do a test of the control circuits for the APU generator.

 S 865-034
 (1)  
Start the APU (Ref 49-11-00/201).

 (a)  
Make sure that the APU GEN OFF BUS light comes on.

 (b)  
Turn the AC meters switch to APU GEN.

 (2)  
Push the APU GEN switches to OFF.

 S 765-037

 (3)  
Look at the residual voltage from the APU generator.

 (a)  
Push and hold the RESID VOLTS switch on the P5-13 panel.

 (b)  
Make sure that the AC voltmeter shows 10 to 21 volts.

 (c)  
Release the RESID VOLTS switch.

 S 865-036
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 S 865-038
 (4)  
Push the APU GEN switches to ON.

 S 765-039

 (5)  
Look at the quality of the power from the APU generator with loads.

 (a)
Make sure the voltmeter shows 110 to 125 volts.

 (b)
Make sure the frequency meter shows 400 | 5 Hz.

 NOTE: Airplanes with APU GTCP85-129 LOADED frequency is
____
 397-417 Hz.

 S 865-040
 (6)  Make sure these lights go off:
 (a)  
APU GEN OFF BUS

 (b)  
BUS OFF No. 1 and No. 2

 (c)  
TRANSFER BUS OFF No. 1 and No. 2.

 S 865-041
 (7)  
Make sure the FF, LV, HV, and MT lights on the M238 annunciator panel are off.

 S 865-042

 (8)  
Stop the APU (Ref 49-11-00/201).

 F. Put the airplane back to its usual condition.
 S 865-032
 (1)  
Set the ELEC 2 switch - HYD PUMP A on the P5 panel to the OFF position.

 S 865-033

 (2)  
Set the ELEC 1 switch - HYD PUMP B on the P5 panel to the OFF position.

 ú ú TASK 24-21-81-245-051 ú3. Generator Control Unit (GCU) Test (Blocking Diode Test)
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