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Page Title:
EPU 28V Switch S73 Functional Check |
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 TM 9-4931-378-13&P
e. Chassis Power Distribution Function Check. Check
Read 4.90 Vdc to 5.10 Vdc on DVM.
(24)
chassis power distribution as follows:
(See table 5-4, 39.)
Disconnect DVM from TP9 (50) and
(25)
(1) Ensure DVM negative lead connected to
TP10 (51).
TP12 (43).
Set POWER TEST switch S12 (53) to
(26)
(2) Using DVM positive lead, read the speci-
LAI 15V.
fied voltage at each of the following con-
Connect DVM positive lead to TP11 (49).
(27)
nector pins: (See table 5-4, 51.)
Connect DVM negative lead to TP12
(28)
(43).
Pin
Vdc
Read 14.80 Vdc to 15.20 Vdc on DVM.
{29)
J3-2 (38)
-14.80 to -15.20
(See table 5-4,40 and 41.)
J3-14
14.80 to 15.20
(30)
Set POWER TEST switch S12 (53) to
J4-I7 (36)
24 to 32
LAI -15V.
J4-25
24 to 32
Read -14.80 Vdc to -15.20 Vdc on
(31)
J4-26
24 to 32
DVM. (See table 5-4,42 and 43.)
Position panel/chassis with back of front
(3)
b. EPU 28V Switch S73 Functional Check. C h e c k
panel toward test personnel.
EPU 28V switch S13 and associated circuits as fol-
(4)
Using DVM positive lead, read the speci-
lows:
fied voltage at each of the following pins.
(2) Ensure DVM negative lead connected to
(See figures 5-11 and 5-12) (See table 5-4,
TP12 (43).
52.)
( 3 ) Set POWER TEST switch S12 (53) to
EPU 28V.
Pin
Vdc
(4) Read 24 Vdc to 32 Vdc on DVM. (See
4.50 to 5.50
S4-1
table 5-4, 44.)
4.50 to 5.50
S19-3
(5) Connect positive DVM lead to TP14 (29).
4.50 to 5.50
S11A-5
(6) Read 24 Vdc to 32 Vdc on DVM. (See
DS12P1-1
4.50 to 5.50
table 5-4, 45.)
DS12P2-1
4.50 to 5.50
(7) Press EPU 28V switch S13 (26) and read
DS12P3-1
4.50 to 5.50
O Vdc on DVM. (See table 5-4, 46.)
{8) Release EPU 28V switch S13 (26).
Set circuit breakers CB1 (47) and CB2
(5)
(46) OFF.
c.
LAI +15V Switch S14 Functional Check. Check
Remove CCA's 1A1, 1A2 and 1A3 in ac-
(6)
LAI +15V switch S14 and associated circuits as
cordance with Chapter 6.
follows:
Set circuit breakers CB1 (47) and CB2
(7)
( 1 ) Set POWER TEST switch S12 (53) to
(46) ON.
LAI +15V.
Using DVM positive lead, read the speci-
(8)
(2) Read 14.80 Vdc to 15.20 Vdc on DVM.
fied voltage at each of the following pins.
(See table 5-5, 47.)
(See figure 5-8). (See table 5-4, 52.)
(3) Press LAI +15V switch S14 (27) and read
OV on DVM. (See table 5-4, 48. )
Vdc
Pin
(4) Release LAI +15V switch S14 (27).
XA3-44
14.80 to 15.20
XA3-43
14.80 to 15.20
d. LAI -15V Switch S15 Functional Check. C h e c k
XA3-96
-14.80 to -15.20
LAI -15V switch S14 and associated circuits as
XA3-97
-14.80 to -15.20
follows:
XA3-21
4.50 to 5.50
XA3-71
( 1 ) Set POWER TEST switch S12 (53) to
4.50 to 5.50
XA2-25
LAI -15V.
4.50
to
5.50
XA2-26
4.50
to
5.50
(2)
Read -14.80 Vdc to -15.20 Vdc on
XA2-75
DVM. (See table 5-4, 49.)
4.50
to
5.50
XA2-76
(3) Press LAI -15V switch S15 (28) and read
4.50
to
5.50
XA1-25
OV on DVM. (See table 5-4, 50.)
4.50
to
5.50
(4) Release LAI -15V switch S15 (28).
XA1-26
4.50
to
5.50
5-17
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