(2)
Analysis of the Malfunctions in the Electrical Generation System.
(3)
General Trouble Shooting Procedures.
(4)
Trouble Shooting an Open Phase Condition.
2. Annunciator Trouble Shooting Charts___________________________________
A. General
(1)
You will find that the Annunciator Trouble Shooting Chart shows the most likely causes of the trouble signal. You can look into a number of incorrect causes before you start the correct procedure to isolate the problem.
B.
Procedure
(1)
These steps will help you use the Annunciator Trouble Shooting Charts:
(a)
Make a note of the signals on the annunciator panel.
(b)
Think about the problem and the possible causes of the problem.
(c)
Use the procedures to remove the possible causes that do not apply.
(d)
When you find two possible actions to correct the problem, do the easiest one first.
(e)
ENGINES WITH A CSD; Examine the component with the manufacturer's recommended procedures before you remove it from the airplane. If you think you have an oil problem in a CSD, examine the drive filter and the line filter before you replace the CSD.
~.............................................................................. | TROUBLE | PROBABLE CAUSE | ISOLATION PROCEDURE | REMEDY | ................................................................................ | The HV (high | The VSCF | Do a BITE test of | Replace the| | voltage) | has a defect. | the VSCF. Look for | VSCF.| | light on the | | the VSCF FAULT| | | M238 comes | | DETECTED light.| | | on.| | | | | | | | |
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
~.............................................................................. | TROUBLE | PROBABLE CAUSE | ISOLATION PROCEDURE | REMEDY | ................................................................................
| | The GCU has | The GCR trips followed by | Replace the |
| | a defect. | the GCB. The annunciator | GCU for the |
| | | panel High Voltage light | applicable |
| | | comes on | generator. |
| | | | |
High VSCF| | The voltage | Change with a GCU that | Replace the |
voltage (120-| | regulator | has a known good voltage | GCU |
125 volts).| | in the GCU | regulator. | |
No automatic| | has a defect. | | |
| GCB trip. | | | |
| After you | | | |
| manually trip| | | |
| the GCB, the | | | |
| VSCF will not| | | |
| come back on | | | |
| line. | | | |
| | | | |
The VSCF will| | The VSCF has | Do a BITE test of | Replace the |
not come on| | a defect. | the VSCF. Look for the | VSCF |
line. The| | | VSCF FAULT DETECTED | |
residual| | | light. | |
| voltage is | | | |
| low | | | |
| (8 volts). | | | |
| | | | |
The LV (low| | The VSCF has | Do the BITE test of the | Replace the |
voltage)| | a defect. | VSCF. Look for the VSCF | VSCF. |
light on the| | | FAULT DETECTED light. | |
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