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TM 55-4920-412-13&P
h. Xmsn Oil Temp.
(1)
Connect Digital multimeter to connector NO 2
pin J (111) and K (LOW), using two leads.
(2)
Set XMSN OIL TEMP CAL/NOR switch to CAL,
HI/LO switch to HI and variable control fully CW.
NOTE
Measure resistance of test leads and
subtract from resistance indications.
(3)
Measure resistance. Digital multimeter will
indicate between 234.04 and 234.96 ohms. If not,
perform Troubleshooting Table 4-11.
(4)
Set XMSN OIL TEMP HI/LO switch to LO.
Digital multimeter will indicate between 86.7 and 87.3
ohms. If not, I perform Troubleshooting Table 4-11.
(5)
Set XMSN OIL TEMP CAL/NOR switch to NOR.
Digital multimeter will indicate between 250 and 290
ohms. If not, perform Troubleshooting Table 4-11.
(6)
Adjust variable control fully CCW. Digital
multimeter will indicate between 84 and 90 ohms.
Table 4-11. Troubleshooting Xmsn Oil Temp (AVIM)
NOTE
Before performing troubleshooting, remove DC simulator A4 board and reconnect
using extender board.
Trouble
Probable Cause
Remedy
No HI-CAL resistance
S23 or S24
Replace defective components,
Figures 4-6, 4-7, FO-2, FO-5 or re-
place A4 board.
HI-CAL resistance
Trim resistors R37
Use decade resistor box, and check or
Indication out of tolerance
replace defective components,
Figures 4-6, 4-7, FO-1, FO-5 or re-
place A4 board.
HI-CAL Resistance
S22 or R36
Replace defective components,
Indication out of tolerance after trim
Figures 4-6, 4-7, FO-1, FO-5 or,
resistors replaced
replace A4 board.
LO-CAL Resistance
S23,S24 or R34
Replace defective components,
Indication out of tolerance after trim
Figures 4-6, 4-7, FO-1, FO-5 or
resistor checked or replaced
replace A4 board.
NOR-FULLY CCW
NOR Control R11
Replace defective components,
Resistance out of tolerance
Figures 4-6, 4-7, FO-1, FO-5 or re-
place A4 board.
NOR-FULLY CW
R11 or R19
Replace defective components,
Resistance out of tolerance
Figures 4-6, 4-7, FO-1, FO-5 or re-
place A4 board.
4-16 Change 2
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