TM 55-4920-413-13&P
(c) Set autotransformer, dc power supply, and
precision oscillator power to ON. Allow equipment to sta-
bilize, and most importantly: maintain the precision oscil-
lator output level at 6.00 Vrms throughout these tests.
(d) Adjust R39 (Figure 4-11) for a 3.591 vac in-
dication on digital voltmeter (R).
(5) Set XMSN OIL PRESS HI/LO switch to HI. Digi-
tal voltmeter will indicate between 2.696 and 2.984 Vrms.
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 digi-
tal voltmeter does not indicate from more than 3.447 to less
than 2.770 vat, perform 4 (a) through (c) above and 6 (a) and (b)
below.
(a) Turn XMSN 01 L PRESS variable control ful-
ly CCW.
(b) Adjust R35 (figure 4-11) for 3.591 vac indication
on digital voltmeter.
Table 4-17. Troubleshooting Oil and XMSN Pressure Voltage Checks (A2) Board (AVIM).
Extender Board and
Oil Pressure (A2) Board
Switch
Voltmeter indications (vat)
Pin Connections
Positions
Approx readings expected
OIL PRESS NO 1 – 59
CAL/LO
1.178 vac
NO 2 - 43
CW and CCW
XMSN
– 17
CAL/HI
0.5 vac
CW and CCW
NOR/HI
1.19 vac
CCW
NOR/LO
1.19 vac
CCW
OIL PRESS NO 1 – 53
CAL/LO
1.288 vac
NO 2 - 37
CW and CCW
XMSN
– 11
CAL/HI
1.288 vac
CW and CCW
NOR/HI
1.288 vac
CW and CCW
NOR/LOW
1.288 vac
CW and Ccw
Ground Loop
XMSN
– 20,8
OIL PRESS NO 1 – 55
ALL
6VAC
N0 2 - 39
POSITIONS
XMSN
– 13
OIL PRESS NO 1 – 51
ALL
.55 vac
NO 2 -35
POSITIONS
XMSN
– 9
OIL PRESS NO 1 – 49
CAL/LO
1.17 vac
N0 2 - 33
CW and CCW
XMSN
– 7
CAL/HI
1.46 vac
CW and CCW
NOR/HI
1.46 vac
CW and CCW
NOR/LO
1.46 vac
CW and CCW
OIL PRESS NO 1 – 61
NO 2 - 40
15 vdc
XMSN
– 19
4-28
Change 1
