Control Data Corporation CDC CC63X Hardware Maintenance Manual page 128

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4. Remove two wing nuts securing modem assembly to rear panel
of drawer assembly in I/F-4 slot position.
5. Grasp ribbon cable running to bottom of modem-assembly
interface board and rock cable back and forth while
applying light pressure until cable connector is free o£
board connector. On CC634-A/CC638-A terminals,
disconnecting the extension ribbon cable from the main
ribbon cable may be easier.
6. Lift retaining tab at front end of left-hand board rack
with one hand, while grasping front edge of modem assembly
with the other hand and withdrawing assembly straight out
from front of rack.
NOTE
Before installing replacement modem
in terminal, check that all jumper
straps on modem are in "factory set"
positions. Refer to figure 6B-25.
7. Install new modem assembly (unpacked in step 1) by
performing the preceding steps in reverse order and
sequence of action.
8. Place replaced modem assembly in packaging material (CDC
PiN 90534500) of replacement assembly for transporting or
shipping the faulty unit to the service or repair center.
6B-42
MODEM
ASSEMBLY
IIF
CARD
Figure 6B-23. Location of Internal Modem in Terminal
62940034 E
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