4. Use the appropriate pack removal/unseat procedure as follows:
a. Circuit Pack Removal Sequence for LU Model 3 (J5D004AD):
1. For each equipped GRID (GRID 0 - GRID 9), unseat the two GRID
packs [TN838s, TN1048s, TN1058(B,C)s].
2. For each equipment group (SG 0 and SG 1), unseat the TN831(B) (first)
and the TN832(B) (last).
5. STOP. YOU HAVE COMPLETED THE PACK REMOVAL PORTION OF THIS
PROCEDURE.
6. Before inserting or reseating the packs in the LU, verify that no fuses are blown
for the -48 V DC power to the LU (either at the LU cabinet or at the Power
Distribution Frame (PDF).
Note: In Step 7, when inserting the packs (one at a time), be alert to a fuse
blowing at the LU cabinet or at the PDF. The blowing of the fuse may be due to a
faulty pack being inserted or some other trouble causing excessive current load
that should be cleared before proceeding with the pack insertion procedure.
7. Use the appropriate pack inserting/reseating procedure as follows (be alert for
the blowing of a fuse):
a. Circuit Pack Insertion Sequence for LU Model 3 (J5D004AD):
1. Insert and latch (one at a time, in the order specified) the UN322(B),
TN335(C,E)s, TN844s, TN832(B), and (last) the TN831(B).
2. For each equipped GRID (GRID 0 - GRID 9), insert and latch (one at a
time) the GRID packs [TN838s, TN1048s, TN1058(B,C)s].
8. Unconditionally restore both SGs and all GRIDs of the LU to service, using the
appropriate RESTORE commands at the Master Control Center (MCC) display
pages or via the appropriate RST input messages.
9. List the OOS lines, type and enter:
OP:LIST,LINES,FULL:OOS.
Type and enter: RST:LINE to restore the OOS lines. Sample test for dial tone.
10. STOP. YOU HAVE COMPLETED THIS PROCEDURE.
CORRECTIVE MAINTENANCE
Procedure 6.3
235-200-150
January 2003
Page 6.3-2 Issue 3.00
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