Table 4-10. Troubleshooting Engine Oil Temp NO 1 or NO 2 (AVIM).

TM 55-4920-413-13&P g. Engine Oil Temp NO 1 and NO 2. (1) Connect digital voltmeter to connector NO 1 pins G (HI) and H (LOW), using two leads. (2) Set ENGINE OIL TEMP NO 1 CAL/NOR switch to CAL and HI/LO switch to HI. NOTE Measure resistance of test leads and subtact from resistance indications. (3) Measure resistance. Digital voltmeter will indicate be- tween 148 and 154 ohms. If not, perform Troubleshooting Ta- ble 4-10. (4) Set ENGINE OIL TEMP NO 1 HI/LO switch to LO. Digital voltmeter will indicate between 71 and 77 ohms. If not, perform Troubleshooting Table 4-10. (5) Set ENGINE OIL TEMP NO 1 CAL/NOR switch to NOR and adjust variable control from fully CCW to fully CW. Digital voltmeter indication will vary from 77 ohms or less to 148 ohms or more. If not, perform Troubleshooting Table 4-10. (6) Disconnect leads from connector NO 1 pins G (HI) and H (LOW) and connect to connector NO 2 pins G (HI) and H (LOW). (7) Repeat (2) through (5) above, except use ENGINE OIL TEMP NO 2 controls, Table 4-10. Troubleshooting Engine Oil Temp NO 1 or NO 2 (AVIM). NOTE Before performing troubleshooting, remove DC simulator A4 board and reconnect using extender board. Trouble I Probable Cause I Remedv —. No HI-CAL Resistance Eng Oil Temp NO 1 (S20) (21) (R41) Replace defective components, Eng Oil Temp NO 2 (S22) (S23) (R38) 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 NO 1 – (R42) or replace defective component, NO 2 – (R39) Figures 4-6,4-7, FO-2, FO-5 or replace A4 board. HI-CAL Resistance NO 1 – (R41) (R43) (S20) or (S21) Replace defective components, Indication out of tolerance after trim NO 2 – (R33) (R40) (S22) (S23) Figures 4-6,4-7, FO-2, FO-5 or resistors checked or replaced (R42) replace A4 board. or (R39) LO-CAL Resistance NO 1 – (S20) Replace defective components, Indication out of tolerance NO 2 – (S22) Figures 4-6,4-7, FO-2, FO-5 or replace A4 board. NOR-FULLY CCW NO 1 – (R9) Replace defective components, Resistance out of tolerance NO 2 – (R1O) Figures 4-6,4-7, FO-2, FO-5 or replace A4 board. NOR-FULLY CW NO 1 (R9) Resistance out of tolerance Replace defective components, NO 2 (R1O) Figures 4-6,4-7, FO-2, FO-5 or replace A4 board. NOTE Not all components listed for circuits above are indicated in Table. Refer to applicable circuits and Troubleshoot us- ing information provided in Table. NOTE Resistance checks are also listed on figure 4-7. 4-15