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TM 55-4920-412-13&P
4-13. Simulator Circuits.
a. Lamp Circuit.
(1)
Set INPUT POWER switch to SIM ONLY and
test equipment power to ON.
(2)
Observe that the 115vac indicator lamp lights. If
not, perform Troubleshooting Table 4-5.
(3)
Observe that the 28vdc indicator lamp lights. If
not, perform Troubleshooting Table 4-5.
(4)
Press LAMP TEST Switch. All warning lamps
will light. If not, perform Troubleshooting Table 4-5.
(5)
Connect 5vdc power supply (current limited to
25ma) between No. 1 connector pins. U, V (+) and EE
(-).
(6)
LAMP SUPPLY OVERLOAD No. 1 warning
lamp will go ON. Set LAMP SUPPLY OVERLOAD
switch to left, lamp will go OFF. If not, see
Troubleshooting Table 4-5.
(7)
Disconnect
dc
power
supply
from
No.
1
connector pins and connector to No. 2 connector pins U,
V (+) and EE (-).
(8)
LAMP SUPPLY OVERLOAD No. 2 warning
lamp will go on. Set LAMP SUPPLY OVERLOAD switch
to right, lamp will go OFF. If not, see Troubleshooting
Table 4-5.
(9)
Disconnect
dc
power
supply
from
No.
2
connector.
(10)
LIGHTING INT/EXT circuit. Connector Digital
multimeter between No. 1 pin HH(LOW) and FF(HI).
Refer to Figure 4-2 for pin locations.
(11)
Observe that ON-OFF-SIM ONLY switch is set
to SIM ONLY and INTEGRAL LIGHTING is set to INT
Digital multimeter will indicate between 4.0 and 6.0vac.
If not, perform Troubleshooting Table 4-5.
b. Power Supply Circuit (Input Voltage to A1 Board)
(1)
Set all Power to OFF.
(2)
Remove power supply board (A1), Figure 4-3
and reconnect, using extender board.
(3)
Connect Digital multimeter positive to loop 2 and
negative to loop 8 on extender board, using two leads.
(4)
Observe that ON-OFF-SIM only switch is set to
SIM ONLY and set equipment POWER is ON. Digital
multimeter
Table 4-5. Troubleshooting Lamp Test Circuit (AVIM)
NOTE
Before performing troubleshooting, remove oil pressure (A2) board and reconnect
using extender board.
Trouble
Probable Cause
Remedy
115 vac Indicator lamp does not light
F1 Fuse (2 amp) S1,T4,DS1
Replace defective component FO-5
28vdc Indicator Lamp does not light
F2 Fuse (8 amp) S1, 330 ohm resis-
Replace defective components FO-5
tor 2W, DS2
Low Oil Press NO 1 and NO 2
DS5/DS6 CR8/CR7
Replace defective components,
Lamps do not light
Figures 4-12, FO-4, FO-5
High Oil Temp NO 1 and NO 2
DS7/DS8 CR6/CR5
Replace defective components,
lamps do not light
Figures 4-12, FO-4 and FO-5
Engine out NO 1 and NO 2 do not
DS9/DS10 CR4/CR3
Replace defective components,
light
Figure 4-12, FO-4 and FO-5.
Lamp Supply Overload NO 1 and
DS3/DS4 S19, CR12/CR11
Replace defective components,
NO 2 do not light
Figures 4-12, FO-4 and FO-5.
Low Rotor SPD does not light
DS 11 CR2
Replace defective components,
Figures 4-12, FO-4 and FO-5.
All Indicator Lamps do not light
Lamp Test Switch S8
Replace defective components,
Figures 4-12, FO-4 and FO-5
INTEGRAL LIGHTING INT Pos-
8 amp Fuse (F3) S39, T4
Replace defective components,
tion indicates no vac.
Figure FO-5.
4-6 Change 2
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