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TM 55-4920-412-13&P
Table 4-15. Troubleshooting Engine Oil Press NO 1 or NO 2 (AVIM)
NOTE
Before performing troubleshooting, remove oil pressure simulator A2 board and
reconnect using extender board.
Trouble
Probable Cause
Remedy
LO/NOR Fully CW
NO 1 - (R5)
First check loops 61 (+) and 14 (-)
indication out of tolerance
NO 2 - (R22)
for 15 vdc and then No 2 loop 40 (+)
for 15 vdc. Check loop 3 for -15
Vdc. Replace defective components,
Figures 4-11, 4-12, FO-4, FO-5, or re-
place A2 board.
LO/NOR Fully CW
NO 1 - R3, R4, R5, U1, L3, S6, S7
Replace defective components,
(Front Panel)
Figures 4-11, 4-12, FO-4, FO-5, or
NO 2 - (R2)(R21)(R22)(U2)(L2)S4/S5
replace A2 board.
(Front Panel)
LO/CAL Fully CCW
NO 1 - (R1)
Replace defective components,
indication out of tolerance
NO 2 - (R18)
Figures 4-11, 4-12, FO-4, FO-5, or re-
place A2 board.
LO/NOR Fully CCW
NO 1 - (R3)(U1)
Replace defective components,
indication out of tolerance after
NO 2 - (R2)(U2)
Figures 4-11, 4-12, FO-4, FO-5, or
adjustment (R1) or (R18)
replace A2 board.
LO/CAL
NO 1 - (R9)
Replace defective components,
indication out of tolerance
NO 2 - (R26)
Figures 4-11, 4-12, FO-4, FO-5, or re-
place A2 board.
LO/CAL indication out of tolerance
ENG OIL PRESS NO 1 HI/LOW
Replace defective components,
after adjustment (R9) or (R26)
switch R8, R2, C5, C6, C7, U4
Figures 4-11, 4-12, FO-4, FO-5, or
ENG OIL PRESS NO 2 HI/LOW
replace A2 board.
switch R25, R19, C1, C12, U4
HI/CAL indication out of tolerance
NO 1 - (R7)
Replace defective components,
NO 2 - (R27)
Figures 4-11, 4-12, FO-4, FO-5, or re-
place A2 board.
HI/CAL indication out of tolerance
NO 1 - R6, R3, U1
Replace defective components,
after adjustment (R7) or (R24)
NO 2 - R23, R20, U2
Figures 4-11, 4-12, FO-4, FO-5 or re-
place A2 board
NOTE
Check input voltage to (A2) board from (A1) board before Troubleshooting (A2)
board. Voltage checks also listed in table 4-17, using figure 4-10 connections.
m
Xmsn Oil Press.
(1)
Connect equipment as shown in Figure 4-
10 connection B, for connector NO 2. Do not disconnect
equipment connected in Figure 4-2.
(2)
Set XMSN OIL PRESS CAL/NOR switch
to CAL and HI/LOW 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 multimeter (A3) does not indicate
between 3.447 and 3.735 vac, perform (a) through (d)
below. If still defective perform Troubleshooting Table
4-16.
(a)
Set auto transformer (A1), dc power
supply (A2), and precision oscillator (A6) power to OFF.
Change 2 4-27
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