TM 9-2350-287-20-12-19. TROUBLESHOOTING CHART (continued).u. AUXILIARY POWER UNIT (continued).(6) GENERATOR CHARGING SYSTEM INDICATORREADS IN LOW YELLOW OR RED WITH MAINENGINE CHARGING.Initial Setup:Tools/Test Equipment:Personnel Required:TwoDigital multimeter (DMM) (Item 13, Appendix I)General mechanic's tool kit (Item 24,Equipment Conditions:Appendix I)APU plenum removed (para 18-17).NOTE·Instead of using multimeter for voltagecheck, STE/ICE troubleshooting, INDIVIDUALBATTERY VOLTAGE TEST-TEST 89 may beperformed.·Instead of using multimeter for continuitycheck, STE/ICE troubleshooting, TEST 91may be performed.·Activate reset switch on APU voltageregulator prior to performingtroubleshooting, and test generator chargingsystem. If condition persists, performtroubleshooting procedure.·Check for APU hydraulic pressure between100 and 300 psi. If pressure is not between100 and 300 psi, adjust hydraulic flowregulator. If condition persists, performtroubleshooting procedure.Continued on next pageChange 1 2-317
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