Table 4-11. Troubleshooting Xmsn Oil Temp (AVIM).

TM 55-4920-413-13&P h. XMSN Oil Temp. (1) Connect digital voltmeter to connector NO 2 pins J (HI) and K (LOW), using two leads. (2) Set XMSN OIL TEMP CAL/NOR switch to CAL and HI/LO switch to HI. NOTE Measure resistance of test leads and subtract from resistance indications. (3) Measure resistance. Digital voltmeter will indicate be- tween 224 and 236 ohms. If not, perform Troubleshooting Ta- ble 4-11. (4) Set XMSN OIL TEMP HI/LO switch to LO. Digital voltmeter will indicate between 79 and 91 ohms. If not, perform Troubleshooting Table 4-11. (5) Set XMSN OIL TEMP CAL/NOR switch to NOR and adjust variable control from fully CCW to fully CW. Digital voltmeter will vary from 88 ohms or less to 270 ohms or more. If not, perform Troubleshooting Table 4-11. Table 4-11. Troubleshooting Xmsn Oil Temp (AVIM). NOTE Before performing troubleshooting, remove DC simulator A4 board and reconnect using extender board. Trouble Probable Cause Remedy NO HI-CAL Resistance S23 or S24 Replace defective components, Figures 4-6, 4-7, FO-2, FO-5 or replace A4 board. HI-CAL Resistance Trim resistors Use decade resistor box, and check Indication out of tolerance R37 or replace defective component, Figures 4-6, 4-7, FO-1, FO-5 or replace A4 board. HI-CAL Resistance S22 or R36 Replace defective components, Indication out of tolerance after Figures 4-6, 4-7, FO-1, FO-5 or trim resistors replaced replace A4 board. LO-CAL Resistance S23, S24, or R34 Replace defective components. Indication out of tolerance after trim Figures 4-6, 4-7, FO-1, FO-5 or resistor checked or replaced replace A4 board. NOR-FULLY CCW NOR Control R11 Replace defective component, Resistance out of tolerance Figures 4-6, 4-7, FO-1, FO-5 or replace A4 board. NOR-FULLY CW R11 or R19 Replace defective components, Resistance out of tolerance Figures 4-6,4 -7, FO-1, FO-5 or replace A4 board. NOTE Resistance checks are also listed on figure 4-7. 4-16