TM 55-4920-413-13&P (7)  Set  ON-OFF-SIM  ONLY  switch  to  OFF  and  precision oscillator switch to OFF. (8) Connect equipment as shown in Figure 4-10, connec- tion A, for connector NO 2. (9) Repeat (2) through (4) above except use ENGINE OIL PRESS NO 2 controls. If not within tolerance in (4) above, per- form (4) (a) through (c) and (a) below. If not in tolerance in (6) above, perform (4) (a) through (c) above and 9 (b) and (c) below. (a) Adjust R22 (figure 4-11) for a 3.591 vac indica- tions on digital voltmeter. m. XMSN Oil Press. (1) Connect equipment as shown in Figure 4-10, connec- tion B, for connector NO 2. Do not disconnect equipment con- nected in Figure 4-1. (2) Set XMSN OIL PRESS CAL/NOR  switch to CAL and HI/LO switch to LO. (3) Set precision oscillator (A6) is 6.00 Vrms at 400 +/-  10Hz. (4) Set ON-OFF-SIM ONLY switch to SIM ONLY. If digital voltmeter does not indicate between 3.447 and 3.735   vat, perform (a) through (d) below. If still defective, per- (b) Turn ENGINE OIL PRESSURE NO 2 varia- form  Troubleshooting  Table  4-16. ble control fully CCW. (a)  Set  autotransformer,  dc  power  supply,  and precision  oscillator  power  to  OFF. (c) Adjust R18 (fig 4-11) for a 3.591 vac indication on (b) Remove pressure board digital voltmeter. reinstall,  using  extender  board  (B4). A2 (Figure 4-11) and Table 4-16. Troubleshooting XMSN OIL PRESS (AVIM). NOTE Before performing troubleshooting, remove frequency simulator A2 board and reconnect using extender board, Trouble Probable Cause Remedy LO/NOR Fully CW R39 First check loops 5 (+) and 14(-) for indication out of tolerance 15 vdc ±5 vdc. Then loop 3 for -15 vdc. If voltages are present proceed below. Replace defective compo- nents, Fig-m-es 4-11, 4-12, FO-4, FO-5, or replace A2 board. LO/NOR Fully CW R13, R39, R38, U3, L1, or S2/S3 Replace  defective  components, indication out of tolerance after (Front Panel) Figures 4-11, 4-12, FO-4, FO-5, or adjustment  (R39) replace  A2  board. LO/NOR  Fully  CCW R35 Replace  defective  components, indication out of tolerance Figures 4-11, 4-12, FO-4, FO-5, or replace  A2  board. LO/NOR  Fully CCW R35, R1 Replace  defective  components, indication  out  of  tolerance Figures 4-11, 4-12, FO-4, FO-5, or after adjustment (R35) replace  A2  board. LO/CAL R43 Replace  defective  components, indication out of tolerance NO 2 – (R26) Figures 4-11, 4-12, FO-4, FO-5, or replace  A2  board. LO/CAL indication out of HI/LOW switch R42 R36, Replace  defective  components, tolerance after adjustment (R43) C15, C16, Cl?, U4, U3 Figures 4-11, 4-12, FO-4, FO-5, or replace  A2  board. LO/CAL indication out of HI/LOW switch R42, R36 Replace  defective  components, tolerance after adjustment (R43) C15, C16, C17, U4, U3 Figures 4-11, 4-12, FO-4, FO-5, or replace  A2  board. HI/CAL  indication  out  of R41 Replace  defective  components, tolerance Figures 4-11, 4-12, FO-4, FO-5, or replace  A2  board. HI/CAL indication out of R40 or R37 Replace  defective  components, tolerance after adjustment (R41) U3 Figures 4-11, 4-12, FO-4, FO-5, or replace  A2  board. NOTE Check input voltage to (A2) board from (A1) board before troubleshooting (A2) board. Voltage checks are listed in Table 4-17, using figure 4-10 connections. Change 1 4-27