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Page Title: Table 4-16. Troubleshooting XMSN OIL PRESSURE (AVIM)
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TM 55-4920-412-13&P (b) Remove     oil     pressure     board     A2 (Figure 4-11) and reinstall, using extender board (B4). (c) Set     auto     transformer,     dc     power supply, and precision oscillator power to ON. (d) Adjust  R39  (Figure  4-11)  for  3.591 vac indication on digital multimeter (R). (5) Set XMSN OIL PRESS HI/LO switch to HI. Digital  multimeter  will  indicate  between  2.696  and  2.984 vac.  If not, perform Troubleshooting Table 4-16. (6) Set  XMSN  CAL/NOR  switch  to  NOR  and adjust   XMSN   variable   control   from   fully   CCW   to   fully CW.    If  digital  multimeter  does  not  indicate  from  more than  3.447  to  less  than  2.770  vac,  perform  4(a)  through (c) above and 6(a) and (b) below. (a) Turn    XMSN    OIL    PRESS    variable control fully clockwise. (b) Adjust   R35   (figure   4-11)   for   3.591 vac indicator on digital multimeter. Table 4-16.  Troubleshooting XMSN OIL PRESSURE (AVIM) NOTE Before  performing  troubleshooting,  remove  oil  pressure  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.  Then loop 3 for -15 vdc. If voltages are present, proceed be- low.  Replace defective components, Figure 4-11, 4-12, FO-4, FO-5, or replace A2 board. LO/NOR Fully CW indication out of R13, R39, R38, U3, L1, or S2/S3 Replace defective components, tolerance after adjustment (R39) (Front Panel) Figures 4-11, 4-12, FO-4, FO-5, or replace A2 board. LO/NOR Fully CCW indication out R35 Replace defective components, of tolerance Figures 4-11, 4-12, FO-4, FO-5, or replace A2 board. LO/NOR Fully CCW indication out R35, R1 Replace defective components, of tolerance after adjustment (R35) Figures 4-11, 4-12, FO-4, FO-5, or replace A2 board. LO/CAL R43 Replace defective components, indication out of tolerance NO 2 - (R26) Figures 4-11, 4-12, F0-4, F0-5, or replace A2 board. LO/CAL indication out of HI/LOW switch R42 Replace defective components, or tolerance after adjustment (R43) R36, C15, C16, C17, U4, U3 Figures 4-11, 4-12, FO-4, FO-5, replace A2 board. LO/CAL indication out of tolerance HI/LOW switch R42, R36 Replace defective components, 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 tolerance R41 Replace defective components, Figures 4-11, 4-12, FO-4, FO-5, or replace A2 board. HI/CAL indication out of tolerance R40 or R37 Replace defective components, 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 also listed in table 4-17 connections. 4-28  Change 2

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