TM 55-4920-413-13&P
h. XMSN Oil Temp.
(1) Connect digital voltmeter to connector NO 2 pins J
(HI) and K (LOW), using two leads.
(2) Set XMSN OIL TEMP CAL/NOR switch to CAL and
HI/LO switch to HI.
NOTE
Measure resistance of test leads and subtract from
resistance indications.
(3) Measure resistance. Digital voltmeter will indicate be-
tween 224 and 236 ohms. If not, perform Troubleshooting Ta-
ble 4-11.
(4) Set XMSN OIL TEMP HI/LO switch to LO. Digital
voltmeter will indicate between 79 and 91 ohms. If not, perform
Troubleshooting Table 4-11.
(5) Set XMSN OIL TEMP CAL/NOR switch to NOR and
adjust variable control from fully CCW to fully CW. Digital
voltmeter will vary from 88 ohms or less to 270 ohms or more.
If not, perform Troubleshooting Table 4-11.
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
replace A4 board.
HI-CAL Resistance
Trim resistors
Use decade resistor box, and check
Indication out of tolerance
R37
or replace defective component,
Figures 4-6, 4-7, FO-1, FO-5 or
replace A4 board.
HI-CAL Resistance
S22 or R36
Replace defective components,
Indication out of tolerance after
Figures 4-6, 4-7, FO-1, FO-5 or
trim 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 component,
Resistance out of tolerance
Figures 4-6, 4-7, FO-1, FO-5 or
replace 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
replace A4 board.
NOTE
Resistance checks are also listed on figure 4-7.
4-16
