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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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