ARMY TM 5-6675-238-14
MARINE CORPS TM 08839A-14/1
Section IV. MAINTENANCE OF PADS TEST SET
8-12. General. Repairable items of the PADS test set
consist of the SPU, tape reader, and cable assemblies.
The buffer unit at this level of maintenance is to be
replaced if defective.
NOTE
The SPU requires adjustments every 90
days or sooner if indicated by the self-test
procedure. The tape reader does not re-
quire any periodic adjustment unless pro-
c e d u r e f a i l s .
8-13. Signal Processor Unit Maintenance. SPU mainte-
nance consists of removal and replacement of instru-
ment case, panel assembly, panel components, chassis
components, logic planes, and power supply compo-
nents, and adjustments every 90 days or sooner if indi-
cated by the self-test procedure. All SPU maintenance
(except for lamp removal and replacement) requires
removal and replacement of instrument case which is
described, once only, in paragraph 8-15. Where similar
components are removed and replaced by identical
procedures, one typical procedure will be given. If
applicable, tag and unsolder, or disconnect, wires prior
to removing components. If applicable, replace heat-
shrinkable tubing and shrink in place.
8-14. Lighted Pushbutton Switch Assembly, or Indica-
tor, Lamp Removal and Replacement. See figure 8-6
and remove and replace lamp from typical lighted
pushbutton switch assembly, or indicator, as follows:
a. Removal.
(1) Remove seal (21, figure 8-6, sheet 2) covering
front of lighted pushbutton switch assembly
DS2 (25) by peeling away from indicator hous-
ing.
(2) Using fingernail slots, pull out lens assembly
(22) to the limit of its travel. Rotate lens
assembly 90 degrees.
(3) Push lens assembly in to release tension on
index keys; then pull out lens assembly and
lamp board (23).
(4) Remove failed lamp (24) from lamp board,
from the rear.
b. Replacement.
8-80.4
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