(2)  
A failure in the VSCF will make a FF indication show on the M238 annunciator panel. If the FF indication shows, do this test before you do the trouble-shooting for a feeder fault.

 (3)  
The BITE test is only accurate if the VSCF has operated since it was installed on the airplane. If the VSCF has not operated since it was installed, you must do the system test.

 (4)  
The VSCF is on the accessory gearbox at the 8 o'clock position.

 B.
References

 (1)  
AMM 24-11-11/401, Variable Speed Constant Frequency
 Generator/Converter

 (2)  
AMM 24-21-00/101, AC Generation System

 (3)  
AMM 24-22-00/201, Manual Control

 C.
Access

 (1)  
Location Zones
 101 Left Control Cabin - P5 overhead panel
 506 Engine 1 - Accessory Gearbox, 8 o'clock
 606 Engine 2 - Accessory Gearbox, 8 o'clock

 (2)  
Access Panels
 5740 CSD Access Door - Engine 1
 5840 CSD Access Door - Engine 2

 D.
Procedure (Fig. 501)

 S 865-002-002
 (1)  
Supply electrical power to the airplane busses from the APU generator or the external power source (AMM 24-22-00/201).

 S 985-003-002

 (2)  
Push the LIGHTS switch in the top right corner of the captain's flight instrument panel P1-1 to BRT.

 (3)  
Push the LIGHTS switch on the center instrument panel P2-2 to BRT.

 (4)  
Open the CSD access door.

 S 985-004-002
 S 015-005-002
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù.
 VARIABLE SPEED CONSTANT FREQUENCY  ú 24-11-11
 GENERATOR/CONVERTERS  ú CONFIG 2 ú 01 Page 501 ú Nov 12/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

737-300/400/500MAINTENANCE MANUAL
BIT SWITCH SEEA B
BIT LIGHTS SEE B
GENERATOR/CONVERTER
ACCESSORY

GEARBOX
FWD
ENGINE LEFT SIDE
A
B Variable Speed Constant Frequency Generator/Converter - BIT Switch
Figure 501 (Sheet 1)

EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH -14 VSCF ú

 24-11-11
 GENERATOR/CONVERTER  ú  CONFIG  2
 ú  02  Page 502
 ú  Jul 12/01 

BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A82146
A

737-300/400/500MAINTENANCE MANUAL 
BIT SWITCH 
SEE  A  B
BIT LIGHTS 
SEE  B 
GENERATOR/CONVERTER 
ACCESSORY 
GEARBOX 
FWD 
ENGINE LEFT SIDE 

A
B
Variable Speed Constant Frequency Generator/Converter - BIT Switch Figure 501 (Sheet 2)
A82157
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH -15 AND -16 VSCF ú

 24-11-11
 GENERATOR/CONVERTER  ú  CONFIG  2
 ú  03  Page 503
 ú  Jul 12/01 

BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
 S 985-006-002
 (5)  Push and hold the switch on the VSCF to LAMP TEST. (a) Make sure that the VSCF FAULT and the AIRCRAFT OPEN PHASE lights come on.
 S 985-008-002
 (6)  AIRPLANES WITH -15, -16, -19 AND -20 VSCF GENERATOR/CONVERTER; Release the LAMP TEST button on the VSCF.
 S 985-009-002
 (7)  Push and hold the switch on the VSCF to INDICATE. (a) Make sure that the VSCF FAULT and the AIRCRAFT OPEN PHASE lights go off. 1) If the VSCF FAULT light is on as a result of a system trip, do the following: a) Troubleshoot the AC Generation System (AMM 24-21-00/101). 2) If the VSCF FAULT light is found on when performing a scheduled maintenance check (no system trip reported), do the following: a) Reset the VSCF FAULT light on -15 or -16 VSCF Generator/Converters (AMM 24-11-12/501).
　
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