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F-15 TROUBLESHOOTING & REPAIRF-15
DC EXCITER TEST (CONTINUED)
FIGURE F.2 – EXCITER COVER REMOVAL
| WARRANTY |
| + |
EXITER | CHECK VOLTAGE |
COVER | AT BRUSH |
| HOLDERS HERE |
| (RIGHT SIDE IS +) |
4.Turn off the engine. Using the 3/8” nut driver, remove the exciter cover. See Figure F.2.
5.Start the engine. Using the volt/ohmmeter, careful- ly check the DC voltage at the brush holders. See Figure F.2. The right side brush holder is positive polarity. Normal DC voltage is 125 - 135VDC with the engine at the high idle speed of 1600 RPM.
6.If the DC voltage is normal at the brush holders, the DC exciter armature and shunt coils are OK.
a.If the voltage is low or not present, proceed with the shunt coil and series coil resistance tests.
b.If the correct DC voltage is present at the brush holders but not at the 120VDC receptacle, the series coil or associated leads may be faulty. See the Wiring Diagram. Proceed with the shunt coil and series coil resistance tests.
