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TM 55-4920-412-13&P
q.
Analog Processor Board No. 2 (A10). Shift Reg
Reset, Shift Reg Out, Shift Reg Drive, Shift Reg Out
Count.
(1)
Set Power to OFF and connect test
equipment as shown in Figure 4-1, unit tester connected.
(2)
Remove Analog Processor No.2 (A10)
from unit tester and reinstall Analog Processor Board on
extender board. Insert extender board into unit tester.
(3)
Place INIER CAL SELECT to 21.
(4)
Connect digital multimeter leads between
test loops 4(+) and 118(-). Set Power to ON. Digital
multimeter will indicate between 4.5 and 5.5 vdc. If not,
see troubleshooting table 4-35.
(5)
Set Power to OFF and disconnect digital
multimeter from unit tester.
(6)
Connect oscilloscope to extender board
test loops, 37 and 118. Set Power to ON.
(7)
Oscilloscope will display positive-going
square wave pulses 4.5 to 5.5 Vp-p. If not, see
troubleshooting table 4-35.
(8)
Set Power switch to OFF. Disconnect
oscilloscope from test loop 37 and reconnect to test loop
41.
(9)
Set Power Switch to ON. Oscilloscope
will display positive going square wave pulses 4.5 to 5.5
Vp-p. If not, see troubleshooting table 4-35.
(10)
Set Power switch to OFF. Disconnect
oscilloscope from test loop 41 and reconnect to test loop
39.
(11)
Set Power switch to ON. Oscilloscope will
display approximately 10 micro seconds reset pulse
momentarily as indicated when Interface Monitor is
resetting. If not, see troubleshooting table 4-35.
(12)
Set Power switch to OFF. Disconnect
oscilloscope from test loop 39 and reconnect to test loop
2.
(13)
Set Power switch to ON. Oscilloscope will
display positive going square wave reset pulses
approximately 1.6 sec duration momentarily as indicated
when Interface Monitor is resetting. If not, see
troubleshooting table 4-35.
Table 4-35. Troubleshooting Analog Processor Board No. 2 (A10). Shift Reg Reset, Shift Reg Out, Shift Reg Drive, Shift
Reg Out Count
Trouble
Probable Cause
Remedy
Shift Reg Reset missing from Board
Inter Cal Select switch. OSC Board
Replace defective components orre-
(A6)
(A6). Analog Processor board No. 1.
place boards (A6),(A9). See figs. 4-16,
4-22, FO-4, FO-10, FO-14.
Shift Reg Out missing from Board
Analog Processor Board No. I (A9).
Replace defective components or
(A6)
board (A9). See figs. 4-22, FO-6,
FO-14.
Shift Reg Drive missing from Board
Analog Processor Board No. 1 (A9).
Replace defective components or
(A9)
board (A9). See figs. 4-22, FO-6.
FO-14.
No Shift Reg Out-count
Analog Processor Board No. 1 (A9).
Replace defective components or
count 183 to A6
board (A9). See figs. 4-22, FO-6,
FO-14.
No Shift Reg Output to J1,J2J3,
Analog Processor Board No. 2 (A 10).
Replace defective components or
J4J5,J6,J7
board (A10). See figs. 4-21, FO-6,
FO-13.
5 vdc low or missing
Logic Power Supply (A3). Regulator
Replace defective components or
Board (A4). Analog Processor Board
boards (A3),(A4),(A9). See figs.
No. 1 (A9).
4-13, 4-14, 4-22, FO-6, FO-7, FO-8,
FO-14.
Change 2 4-65
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