TM 11-5895-856-34-1/EE640-CA-MMI-010/E154 CPU/TO31W2-2T-122-1
Table 3-4. MTS Test Aid Lamp Numbers and Related Circuit Card Pin Numbers- Continued
Circuit card assemblies and I/O pin numbers
MTS
test
Circuit
587102- 102 thru
aid
card
149616-100,
587106-102,
lamp
assy
149612-100,
149676-100,
587108-102 thru
no.
TP no.
149513-100
149680-100
587110- 102
587117-102
71
38A
78
78
78
77
72
39A
-
80
80
75
Section IV. REPAIR
3
3-9. Frame and Support Structure Maintenance
-8. General
a. Inspect for loose hardware, cleanliness, seating
a. This section provides information required for
of connectors and discoloration of components due to
direct support maintenance of the ADP assemblies in
excessive heat.
both the CSCPG and MSCPG; and consists of card
cage repair, connector repair, and removal and
b. Check for damage to frames, mounting
replacement procedures for the major subassemblies.
brackets, hinges and hinge pins.
The scope of direct support maintenance is limited by
NOTE
the authorized repair parts, tools, and test equipment.
Refer to TM 11-5805-681-34 and TM
Refer to paragraph 3-3 for tools and test equipment and
11-5805-683-34
for
replacement
to the RPSTL TM 11-5895-856-34P for repair parts
instructions on hinge pins and
authorized at this level of maintenance.
mounting brackets.
b. Direct support personnel are called by the using
3-10. Card Cage Repair
organization to perform corrective maintenance actions
a. The card cage assemblies provide the interface
on the ADP assemblies when the repair task is beyond
connections between the analog and the digital cards
the skill level, repair authorization, or resources of the
within the unit.
They also provide input/output
organizational level personnel. Direct support personnel
connectors which interface the unit with the rest of the
are authorized to perform on-site minor repairs to the
system. The card cages are made by sandwiching a
card cages. This includes first, any repairs that could be
sheet of insulation between two conducting aluminum
performed by organizational personnel and, second,
alloy plates. The front plate, card connector side, is the
minor card cage repairs including items such as chassis-
power plate (+5 vdc) and the back plate, wire wrap side,
mounted resistors, capacitors, and diodes; and limited
is the ground plate. The 80-pin card connectors are
chassis wiring repairs which include connector pin
mounted on the power plate with the pins feeding
replacement. Soldered component replacements can
through holes in both plates to the wire wrap side.
be accomplished with the card cage in place if no more
Ground and power connections are made using press-in
than ten wires must be removed from the component.
ferrets to make contact between the pin and the desired
Wire wrap termination' can be accomplished if the
s
plate. All connector interconnections are accomplished
repair does not involve replacement of the ground or
using wire wrap termination' .
s
power-sleeved connector pins (sleeved pins require
b. Card cage failures will result in the same type of
special tools and procedures for replacement), or does
failure indications as failed cards but will not be
not involve replacement of pins or wires which would
corrected by card replacement. The majority of card
result in a pyramiding wire replacement situation. In the
cage failures can be isolated and corrected on-site by
event there is multiple pin damage or the connector
direct support personnel using visual inspection, the
itself is damaged, the card cage must be removed for
module test set (MTS), and the MTS test aid (a
depot repair.
Replacement of all card cages is
functional lamp display box), and wire lists Section V).
accomplished by direct support personnel. Visual aids
c. Two general categories of card cage repair can
for removal and replacement procedures are provided in
be accomplished at direct support level: wire
the form of location diagrams and cable interconnection
replacements subject to pyramiding conditions
diagrams.
3-9
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