TB 9-4931-488-24
19. Power Supply
a. Performance Check
(1) Remove top cover from TI.
(2) Check to see that the five LED's on supply boards (fig. 2) are on.
(3) Connect multimeter to test points listed in table 32 and chassis ground.
If
multimeter does not indicate within limits specified in table 32, perform b below.
Table 32. Power Supply Check.
Test
Dc voltage limits
instrument
Adjustments
test point
locations
indications
Min
Max
locations
(V dc)
A18TP3 1
A18R1 2
-5.10
-5.30
-5.2
A20TP10
+5.10
+5.30
A20R16
+5.2
A22TP4
+19.90
+20.10
A22R7
+20
A22TP9
-19.90
-20.10
A22R19
-20
A20TP4
+44.50
+44.70
A20R8
+44.6
1 For
some models, this may be TP5.
2 For
some models, this may be A18R2.
b. Adjustments. Adjust test point voltages to within limits as indicated using values
and locations listed in table 32.
20. Final Procedure
a. Deenergize and disconnect all equipment.
b. Annotate and affix DA label/form in accordance with TB 750-25.
