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TM 55-4920-412-13&P
4-14.
Unit Tester Circuits.
a.
Lamp Test Circuit.
Set ON-OFF-SIM ONLY to OFF.
(1)
Connect test equipment as shown in
Figure 4-1, with unit tester connected to simulator, using
cable P/N 217- 419742-000.
(2)
Set ON-OFF-SIM ONLY to ON.
(3)
Press simulator LAMP TEST Switch.
(4)
Lamps on unit tester will light as follows.
If
not,
replace
lights
as
applicable
or
see
Troubleshooting Table 4-19.
(a)
LOW ROTOR SPEED.
(b)
LOW ENG 1 OUT, LOW ENG 2
OUT.
(c)
LOW
OIL 1
PRESS,
LOW
2
PRESS.
(d)
HIGH OIL 1 TEMP. HIGH OIL 2
TEMP.
(e)
SENSING A, B.
(f)
ROTOR
OVER
SPEED
127%,
137%, 142%.
(g)
INT. LIGHTS
(h)
TEST FREQ. ANA-DIG
(i)
MONITORS-SHIFT
REG.
MUX
ANALOG,
DIGITAL
O/P,
MUX
DIGITAL.
(j)
PROCESSOR SELECTION A-B ANALOG, A-B
DIGITAL.
(k)
FAIL WARNING.
(5)
Release simulator lamp test switch, lamps
will go off.
(6)
Set ON-OFF-SIM ONLY to OFF.
NOTE
Perform
paragraph
4-14a
before
Troubleshooting (A2) Board.
b.
Lamp Power Supply Board(A2).
(1)
Set ON-OFF-SIM ONLY to OFF.
(2)
Connect test equipment as shown in
Figure 4-1 with unit tester connected.
(3)
Connect digital multimeter leads between
J6 pin 16(+) and SDC common (panel front).
(4)
Set ON-OFF-SIM ONLY to ON and P/S
CONT to NORMAL and P/S CONTROL to fully CCW
position.
(5)
Digital multimeter will indicate between
+4.5 and +5.5 vdc. If not, see Troubleshooting Table
4-20.
(6)
Set ON-OFF-SIM ONLY to OFF.
(7)
Disconnect digital multimeter lead from J6
pin 16 and 1 reconnect to J3 pin 34.
(8)
Set ON-OFF-SIM ONLY to ON.
Table 4-19. Troubleshooting Lamp Test Circuit (AVIM)
Trouble
Probable Cause
Remedy
Indicator Lamps,
28 vdc missing from Interconnecting
Replace defective components on
para 4-14a(4)(a) thru (g)
Cable; 5 vdc missing from Lamp
Lamp Test board, see fig. FO-6.
do not light
Test Board.
Indicator Lamps,
115 vac missing from
Replace defective components on
para 4-14a4 (h thru k) do not
Interconnecting Cable, Voltage
Lamp Test Board, FO-6 (sheet 11 of 16);
light
Regulator Board (A4) 5 vdc missing.
Logic Power Supply A3 (figs 4-13 and
Lamp Test Board, Logic Power
FO-7); and Regulator Board
Supply Board (A3).
Assembly (A4) (figs. 4-14 and FO-8).
4-40 Change 2
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