EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
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ALL ú ú 02 Page 102 ú Nov 15/95
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
~.............................................................................. | TROUBLE | PROBABLE CAUSE | ISOLATION PROCEDURE | REMEDY | ................................................................................
| | The generator | Examine the generator | Replace the|
| | on the CSD | voltage at the generator | generator|
| | has a defect. | control panel. | |
| | | The airplane's volt - | |
| | | meter should show 115 | |
| | | (|2) volts | |
| | | | |
| | The generator | Examine the continuity | Replace the|
| | field relay | thru the GCR. Examine | GCU to replace|
| | (GCR) contacts | terminal B9 on the GCU to | the GCR.|
| | (K603A) have | terminal F on the | Repair the|
| | a defect. | generator. | wiring if it|
| | | | is necessary.|
| | | | |
| | The exciter | Measure the exciter field | Replace the|
| | field has an | resistance at the exciter | generator|
| | open or a | terminals or at the | |
| | short (CSD | generator switch. The | |
| | engines). | resistance shouldbe | |
| | | between 6.7 and 9.0 ohms. | |
| | | | |
| | A defective | Change the GCU to examine | Replace the|
| | rotating | the generator rotation, | generator.|
| | rectifier | the exciter field and the | |
| | (CSD engines) | voltage regulator. | |
| | | | |
| LV (low | A fire switch | Examine the generator, | Replace the|
| voltage) | or its wiring | GCB, and GCR. If the | fire switch or|
| light comes | has a defect. | under-voltage light | repair the|
| on for both | The GCR and GCB | comes on after 5-9 | wiring.|
| generators | trip with a | seconds, look for an | |
| | good GCU. | open circuit in the | |
| | | fire switch. | |
| | | | |
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
24-21-00
ALL ú ú 02 Page 103 ú Jul 12/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
~.............................................................................. | TROUBLE | PROBABLE CAUSE | ISOLATION PROCEDURE | REMEDY | ................................................................................
The Feeder| | The VSCF has a | Do the BITE test for the | Replace the |
Fault light| | defect. | VSCF. Look for the | VSCF. |
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