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TM 55-4920-412-13&P
d. Torque NO 1 and NO 2.
(1)
Set ON-OFF-SIM ONLY switch to OFF.
(2)
Connect Digital multimeter to J1 connector NO 1
pins E(HI) and F(LOW), using two leads (B7). Refer to
Figure 4-2 for pin locations.
(3)
Set TORQUE NO 1 CAL/NOR switch to CAL,
HI/LO
switch to HI and variable control fully clockwise
(CW).
(4)
Set ON-OFF-SIM ONLY switch to SIM ONLY.
Digital multimeter will indicate between +3.6963 and
+3.7037 vdc. If not, perform Troubleshooting Table 4-7.
(5)
Set TORQUE NO 1 HI/LO switch to LO. Digital
multimeter will indicate between -0.1 and +0.1 mvdc. If
not, perform Troubleshooting Table 4-7.
(6)
Set TORQUE NO 1 CAL/NOR switch to NOR
and turn variable control fully counterclockwise (CCW).
Digital multimeter will indicate between -3.0 and +3.0
mvdc. If not, perform Troubleshooting Table 4-7.
(7)
Adjust variable control fully CW. Digital
multimeter will indicate between +5.415 and +5.815 Vdc.
If not, perform Troubleshooting Table 4-7.
(8)
Set ON-OFF-SIM ONLY switch to OFF.
(9)
Disconnect leads from connector NO 1 pins E
(HI) and F(LOW) and connect to connector NO 2 pins a
(HI) and b (LOW).
(10)
Repeat (3) thru (8) above, except use TORQUE
NO 2 controls.
Table 4-7. Troubleshooting Power Supply Circuit (AVIM)
NOTE
Before performing troubleshooting, remove power supply A1 board and reconnect
using extender board.
Trouble
Probable Cause
Remedy
Torque
C11,C12,R52,CR5 (6.2 vdc), Also
First check loops 18(+) and 14 (-)
No HI-CAL VOLTAGE
NO 1 (R45)
for input 12 vdc t5 vdc, Replace
NO 2 (R48)
defective components, Figure 4-6, 4-7,
FO-2, FO-5 or replace A4 board.
HI-CAL VOLTAGE
Trim Resistors
Use decade resistor box, and check
Indication out of tolerance
NO 1 - (R46,R51)
or replace malfunctioning
NO 2 - (R49,R50)
components, Figures 4-6, 4-7, FO-2,
FO-5 or replace A4 board.
HI-CAL VOLTAGE
NO 1 - CR5,R44,R45,S34 or S35
If trim resistors do not bring
Indication out of tolerance after trim
NO 2 - CRS,R48,R47,S36 or S37
reading in tolerance, replace mal-
resistors checked or replaced
functioning components. Figure 4-5, 4-7,
FO-2, FO-6 or replace A4 board.
LO-CAL Indication out
NO 1 - (S34)
Replace malfunctioning components,
of tolerance
NO 2 - (S35)
Figures 4-6, 4-7, FO-2, FO-5 or
replace A4 board.
Indication out of tolerance in
NO 1 (R16)
Replace malfunctioning components,
NOR-FULLY GCW
NO 2 (R17)
Figures 4-6, 4-7, FO-2, FO-5 or
replace A4 board.
In NOR-FULLY CW
NO 1 (R16) (R44)
Replace malfunctioning component,
NO 2 (R17) (R47)
Figures 4-6, 4-7, FO-2, FO-5 or
replace A4 board.
NOTE
Voltage checks are also listed on figure 4-7.
4-12 Change 2
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