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Page Title: l Engine Oil Press NO 1 and NO 2.
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TM 55-4920-412-13&P l    Engine Oil Press NO 1 and NO 2. (1) Connect equipment as shown in Figure 4- 10, connection A for connector NO 1.  Do not disconnect equipment connected in Figure 4-1. (2) Set ENGINE OIL PRESS NO 1 CAL/NOR switch to CAL and HI/LO switch to LO. (3) Set precision  oscillator  (A6)  for  a  6-V,  400 Hz output (4) Set   ON-OFF-SIM   ONLY   switch   to   SIM ONLY.      If   digital   voltmeter   does   not   indicate   between 3.447  and  3.735  vac,  perform  (a)  through  (d)  below.    If still defective perform Troubleshooting Table 4-15. (a) Set     auto     transformer,     dc     power supply (A2), and precision oscillator power to OFF. (b) Remove     oil     pressure     board     A2 (Figure 4-11) and reinstall, using extender board. (c) Set     auto     transformer,     dc     power supply, and precision oscillator power to ON. (d) Adjust  R5  (Figure  4-11)  for  a  3.591 vac indication on digital voltmeter (oil No. 1).' (5) ENGINE  OIL  PRESS  NO  1  HI/LO  switch to  HI.  Digital  multimeter  will  indicate  between  2.770  and 3.058 vac.  If not, perform Troubleshooting Table 4-15. (6) Set ENGINE OIL PRESS NO 1 CAL/NOR    switch    to    NOR    and    adjust    ENGINE    OIL PRESS  NO  1  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  adjustments (4)(a) through (c) above and 6(a) and (b) below. (a) Turn   ENGINE   OIL   PRESS   NO   1 variable control fully CCW. (b) Adjust  R1  (Figure  4-11)  for  a  3.591 vac indication on digital voltmeter. (7) Set   ON-OFF-SIM   ONLY   switch   to   OFF and precision oscillator switch to OFF> (8) Connect equipment as shown in Figure 4- 10, connection A, for connector NO 2. (9) Repeat  (2)  through  (4)  above  except  use ENGINE   OIL   PRESS   NO   2   controls.      If   not   within tolerances in (4) above, perform 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 indication on digital multimeter. (b) Turn    Engine    Oil    Pressure    NO    2 variable control fully CCW. (c) Adjust   R18   (fig.   4-11)   for   a   3.591 vac indication on digital multimeter. 4-26  Change 2

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