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 24-21-81
 ALL  ú ú 01.1 Page 504 ú Jul 12/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 B. References
 (1)  
24-22-00/201, Manual Control

 (2)  
24-21-81/401, Generator Control Unit

 (3)  
24-31-11/201, Storage Battery

 C.
Access

 (1)  
Location Zone
 101 Control Cabin - Left
 102 Control Cabin - Right

 D.
Generator Control Unit Test

 S 765-067
 (1)  On the P5-13 panel, put the BAT switch in the ON position.
 NOTE:____Do not use any other electrical power source. If another power source is used, the test results will not be accurate.
 S 765-069
 (2)  On the P5-5 panel, do these steps:
 (a)  
Make sure both left and right BUS OFF and GEN OFF BUS lights are ON.

 (b)  
On the P5-4 panel, do these steps: 1) Make sure the STANDBY POWER switch is in the AUTO position. 2) Make sure the STANDBY PWR OFF light is ON.

 S 765-068
 (3)  Open these circuit breakers:
 (a)  
On the main power distribution panel, P6-4: 6D9 or 6D10 Control Generator No. 1, (C4) 6D10 or 6D11 Control Generator No. 2, (C5) 6D11 or 6D12 Control Generator APU, (C6)

 (b)  
On the P5-4 panel, do these steps: 1) Make sure the STANDBY PWR OFF light is OFF. 2) Put the STANDBY POWER switch to OFF.

 a) Make sure the STANDBY PWR OFF light is ON.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 24-21-81
 ALL  ú ú 01 Page 505 ú Mar 12/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 S 485-071
 (4)  On the Fluke 87 meter, do these steps:
 (a)  
Select the diode function.

 (b)  
Attach the red lead to the volt, ohm, diode jack.

 (c)  
Attach the black lead to the common jack.

 S 485-070
 (5)  On the P6 panel, attach the common (black) lead from the Fluke 87 meter to the M400 Power System Test module, (-) DC jack.
 NOTE: The M400 switches can be in any position for this test.
____
 S 015-082
 WARNING:_______THE CIRCUIT BREAKERS HAVE ELECTRICAL POWER. DO NOT TOUCH ANY OTHER OBJECTS WITH THE METER LEAD. DAMAGE TO EQUIPMENT OR PERSONNEL MAY OCCUR.
 (6)  
Open the P6-4 panel.

 S 765-081

 (7)  
On the P6-4 panel, attach or touch the red lead to the load side of these circuit breakers. 6D9 or 6D10 Control Generator No. 1, (C4) 6D10 or 6D11 Control Generator No. 2, (C5) 6D11 or 6D12 Control Generator APU, (C6)

 NOTE: The load side of the circuit breaker is the terminal closest
____
 to the P6-4 panel hinge line.

 S 485-073
 (8)  On the Fluke 87 multimeter, make sure OL is not shown.
 NOTE: A different value from OL shown is required to indicate the
____ condition of the test circuit. The test circuit is the airplane wiring, components, meter leads, meter and the M400 (-) DC jack.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 24-21-81
 ALL  ú ú 01 Page 506 ú Mar 12/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 S 485-074
 (9)  On the Fluke 87 multimeter, do these steps:
 (a)  Reverse the leads at the meter.
 1) The red lead in the common jack.
 2) The black lead in the volt, ohm, diode jack.

 S 485-075
 (10) On the P6-4 panel, attach or touch the red lead to the load side of these circuit breakers: 6D9 or 6D10 Control Generator No. 1, (C4) 6D10 or 6D11 Control Generator No. 2, (C5) 6D11 or 6D12 Control Generator APU, (C6)
　
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