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TM 55-4920-412-13&P
(23)
Digital multimeter will indicate between
+4.5 and +5.5 vdc. If not, see Troubleshooting Table
4-32.
(24)
Set P/S control to REMOTE. Disconnect
digital multimeter LEAD from J9 pin 19 and reconnect to
ILS test point Digital multimeter will indicate between 4.5
and 5.5 vdc. If not, see Troubleshooting Table 4-32.
(25)
Set Power Switch to OFF. Disconnect
digital multimeter.
(26)
Connect oscilloscope to test loop 37
(TIEST FREQ). Set Power Switch to ON.
(27)
Oscilloscope will display positive-going
test frequency pulses 4.5 to 5.5 Vp-p. If not, see
troubleshooting table 4-32.
(28)
Set Power Switch to OFF and disconnect
oscilloscope lead from test loop 37 and connect digital
voltmeter leads to test loop 10. Set Power Switch to ON.
Digital multimeter will indicate between -4.5 to -5.5 vdc.
If not, see troubleshooting table 4-32.
(29)
Set Power Switch to OFF and disconnect
digital multimeter from test loop 10.
(30)
Connect oscilloscope to test loop 7. Set
power switch to ON. Oscilloscope will display positive-
going reset pulse approximately 1.6 seconds in direction
when interface monitor is resetting. If not, see
troubleshooting table 4-32.
(31)
Set Power Switch to OFF and disconnect
oscilloscope from test loop 7 and reconnect to test loop
13.
(32)
Set Power Switch to ON and observe
approximately
10
micro
seconds
reset
pulse
momentarily when interface monitor is resetting. If not,
see troubleshooting table 4-32.
o.
Processors Selection - Analog AB/Digital A3,
Wiring
Verification,
Fail
Warn
Lamp,
Test
Freq-
ANAIDIG. B C D Counter Board (AS) Circuits.
(1)
Set Power Switch to OFF.
(2)
Remove B C D Counter Board (A5) and
reconnect extender board.
(3)
Connect
jumper
between
loops
44
(ground) and 28 on extender board.
(4)
Set Power Switch to ON. Fail Warn Light.
If not, see Troubleshooting Table 4-33.
(5)
Set Power Switch to OFF.
(6)
Remove jumper from extender board.
(7)
Connect jumper between test loops 39
and 1 (5v).
(8)
Set Power Switch to ON. Test Freq Dig
Light will light. If not, see troubleshooting table 4-33.
(9)
Set Power Switch to OFF.
(10)
Remove jumper from extender board.
(11)
Connect jumper between test loops 43
and 1 (Sv).
(12)
Set Power switch to ON. Test Freq ANA
Light will light. If not, see troubleshooting table 4-33.
(13)
Set Power switch to OFF.
(14)
Repeat technique (9) through (13) above
for each test loop connections 33 and 1 (Select B DIG
PROC); 35 and (Select A DIG PROC); 37 and 1 (Select
A ANA PROC); 41 and 1 (Select B ANA PROC). Lights
will light for each circuit connection. If not, see
troubleshooting table 4-33.
(15)
Set power switch to OFF.
(16)
Disconnect jumper lead from test loop 41
and 1.
(17)
Connect
oscilloscope
and
Frequency
Counter between test loops 15 (HI) and 44 (LO).
(18)
Set Power Switch to ON. Oscilloscope
shall display positive going square wave pulses between
4.5 and 5.5 Vp-p. If not, see troubleshooting table 4-33.
(19)
Set Power Switch to OFF.
(20)
Repeat techniques (15),(17) and (19)
above, connecting oscilloscope to each test loop output
as shown in fig 4-18 for units, tens, hundreds and
thousands. Check in order shown for positive going
square wave pulses between 4.5 and 5.5 Vp-p with
successively longer periods. If not, see troubleshooting
table 4-33.
(21)
Oscilloscope shall display each output
momentarily going to +5 vdc and returning to zero.
(22)
Set Power Switch to OFF.
(23)
Disconnect oscilloscope from test loop 3.
(24)
Connect to test loop 22 and set power to
ON.
(25)
Oscilloscope should display reset pulse
input. Interface Monitor will reset to zero and begin
counting.
4-60 Change 2
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