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SECTION 4
Senice 1nfomarion
4.6.2
Rear Shield Removal
and Replace-
ment
A copper-cladded
shield is located on the rear side of the
PC board in order to provide protection from static dis-
charge. The copper shield is electrically
connected
to
chassis ground of the multiplexer
card through one of the
standoffs.
In order to service the multiplexer
card, it may be neces-
sary to remove the rear shield. Referring to Figure 4-14,
perform the following
procedure to remove and install
the rear shield:
1. Remove the top shield, as discussed in paragraph
4.6.1.
2. Remove the eight screws that secure the rear shield
to the PC board, then remove the shield from the PC
board.
3. To reinstall the shield, reverse the above procedure.
Make sue the metal side of the shield is faciw
out-
CAUTION
Make sure all screws are installed
and se-
cured properly
to enawe good mechanical
integrity
and electrical contact.
4.7
TROUBLESHOOTING
4.7.1
Recommended
Equipment
Table 4-5 summarizes
the recommended
equipment
for
general troubleshooting.
4.7.2
Using the Extender
Card
In order to gain access to the test points and other cir-
cuitry on the Model 7074, the card must be plugged into
theModel7070UniversalAdapterCardused
as anexten-
der card, which, in turn, must be plugged into the desired
slot of the mainframe.
The Model 7070 must be config-
ured as an extender card by placing the configuration
jumper in the EXTEND position. See the documentation
supplied with the Model 7070 for complete details on us-
ward.
ini the card.
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