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Page Title:
Circuit Card Assembly 1A2 Functional Check. |
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 TM 9-4931-378-13&P
Vdc
Set DATA WD SEL switch S8 (22) to
(22)
S7 Position
-0.014 to 0.014
0
(23)
Connect jumper wire between pin 4 of J3
-0.021 to -0.049
5
(38) and pin 46 of J4 (46).
10
-0.056 to -0.084
(24)
Connect jumper wire between pin 1 of J3
15
-0.091 to -0.119
(38) and pin 53 of J4 (46).
-0.126 to -0.154
20
(25)
Set circuit breakers CB1 (47) and C82
-0.161 to -0.189
25
(46) to ON.
30
-0.196 to -0.224
Confirm DATA WORD display (23)
(26)
shows 255. (See table 5-4, 67.)
(27)
Confirm DATA WORD lamps 7 through
k. Circuit Card Assembly 1A2 Functional Check.
0 (3) are illuminated. (See table 5-4, 68.)
Check circuit card assembly 1A2 as follows:
(28)
Set DATA MODE switch S1 (4) to
(1) Set circuit breakers CB1 (47) and CB2
HOLD.
(46) to OFF.
(29)
Confirm DATA WORD display (23)
( 2 ) Set OUTPUT SEL 1 switch S9 (21) to
shows 255. (See table 5-4, 67.)
DTR.
(30)
Confirm DATA WORD lamps 7 through
(3) Set DATA MODE switch S1 (4) to
0 (3) are illuminated. (See table 5-4, 67.)
CONT.
(31) Set DATA MODE switch S1 (4) to RPT
( 4 ) Set DATA WD SEL switch S8 (22) to
and hold.
(32)
Confirm DATA WORD display (23)
(5) Connect a jumper wire between pins 47
shows 255. (See table 5-4, 67.)
and 56 of connector J4 (36).
(33 )
Confirm DATA WORD lamps 7 through
(6) Connect a jumper wire between pins 48
0 (3) are illuminated. (See table 5-4, 67.)
and 62 of connector J4 (36).
(34)
Set DATA MODE switch S1 (4) to
(7) Connect oscilloscope positive lead to TP1
CONT.
(20).
Monitor DATA WORD lamps 7 through 0
(35)
(8) Connect oscilloscope negative lead to TP4
(3), DATA WORD display (23), and
(17).
PARITY FLR lamp (6) while setting
(9) Connect oscilloscope external trigger in-
DATA WD SEL switch S8 (22) through
put to TP5 (16).
STAT
(10) Set circuit breakers CB1 (47) and CB2
1 and STAT 2.
(46) to ON.
DATA WORD display (23) indicates 255.
(36)
(11) Observe waveform 1, figure 5-13. (See
(See table 5-4, 67.)
table 5-4, 63.)
(37 )
DATA WORD lamps 7 through 0 (3) are
(12) Set OUTPUT SEL 1 switch S9 (21, figure
illuminated. (See table 5-4, 67.)
2-1) to CLK.
(38)
PARITY FLR lamp (5) illuminates only
(13) Set DATA WD SEL switch S8 (22) to
when DATA WD SEL switch S8 (22) is in
STAT 2.
STAT 2. (See table 5-4, 67.)
(14) Observe waveform 2, figure 5-13. (See
(39)
Set circuit breakers CB1 (48) and CB2
table 5-4, 64. )
(46) to OFF.
(15) Confirm PARITY FLR lamp (6), figure
(40)
Remove all jumper wires from panel/
chassis.
(16) Set circuit
breakers CB1 (47) and CB2
1.
Reference Oscillator Functional Check.
(46) OFF.
(1) Set TS MON switch S11 (52) to REF
(17) Disconnect
oscilloscope leads and jumper
Osc.
wires from
panel/chassis.
(2) Connect DVM and oscilloscope positive
(18) Set circuit
breakers CB1 (47) and CB2
leads to TP9 (50).
(46) ON.
(3) Connect DVM and oscilloscope negative
(19) Set DATA WD SEL switch SB (22) to
leads to TP10 (51).
VDW.
(20) Confirm PARITY FLR lamp (6) is illumi-
NOTE
The peak-to-peak voltage displayed on
nated. (See table 5-4, 66.)
the oscilloscope vertical scale is measured
(21) Set circuit breakers CB1 (47) and CB2
(46) to OFF.
as RMS on the DVM.
5-20
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