TM 5-6350-264-14&P-10NAVELEX EE 181-AA-OMI-110/E121 C-9412T.O. 31S9-2FSS9-1-10Table 5-2. Troubleshooting Procedures - ContinuedTroubleProbable causeCorrective action1.(Cont)a.(Cont)period, check power supply. Set multi-meter to dc volts and connect negativelead to chassis (ground). Connect posi-tive lead to power supply, TB2-3. Metershould indicate 20 +1 vdc. Connect posi-tive lead to TB2-5. Meter should indicate5 +0.25 vdc. Connect lead to TB2-2.Meter should indicate 28 ±2 vdc. Turnmode switch to TEST/RESET and thento SECURE.b.Bad tampera.Set multimeter to dc volts and connectalarm circui-positive meter lead to PC board A7,try or TAS.TP1 (brown), and negative lead to chas-sis (ground). Push TAS plunger all theway in, and then pull plunger all the wayout. Meter should indicate less than0.5 vdc for both switch positions. De-press TAS plunger and then release.Meter should indicate 18.5 to 21 vdc.b.If these meter indications are not correct,turn off switch S1 on top of power sup-ply. Use board ejector to remove PCboard A7. Set multimeter to ohms andconnect meter leads to TAS terminalswhich have wires attached. Push TASplunger all the way in, and then pullplunger all the way out. Meter shouldindicate 0 ohms for both switch posi-tions. Depress TAS plunger and thenrelease. Meter should indicate over100,000 ohms.c.If these meter indications are not cor-rect, replace TAS.(1) To remove TAS, remove two screwsthat secure TAS to edge of CUhousing. Loosen screws that securecrimp lugs to switch.(2) To install new TAS, slip crimplugs under screw heads markedCOM and NO on switch, andtighten screws. Insert switch throughhole in edge of housing from the5-16
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