AT&T System 25 User Manual
Page 65
INSTALLATION
If all the CPs are operating properly, only the green LED on the CPU/Memory CP
and the amber LED on the Service Circuit should be flashing. If any other CP
has a no-lighted LED, the CP may need to be reseated. All port CPs green LED
remains dark until at least one port on the CP has been translated.
Except for the CPU/Memory CP and Service Circuit CPs, power can be left on
while a CP is reseated. To reseat a CP, do the following:
1.
2.
3.
4.
5.
6.
7.
See CAUTION. Make sure your hands are clean and dry. Put on a wrist
grounding strap, and clip it to the grounding block at the rear of the
cabinet.
Caution: Static electricity can damage a CP.
With your thumb, pull up on the latch pin of the removal lever. (See
When the latch pin is up, pull the removal lever down until it stops, at an
angle of about 30 degrees to the floor.
Tugging hard, pull the CP out a few inches. Leave it out for at least 30
seconds, and then push it back firmly into its slot. When it is almost back
in place, you’ll feel resistance. The removal lever will start to return to its
vertical position.
Push the lever all the way to vertical until it catches on the latch pin.
After the power-up, repeat this process for each CP with dark LEDs
(except for ZTN129 orZTN130 [R3] and TN763s).
Recheck the LEDs on all CPs. (If a CP’s LEDs are not lighted, the CPs
are considered “unadministered” by the CPU. ) A lighted red LED on any
CP indicated that it is faulty.
November 1995
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