3746-900 MAPs
MAP 5150: 3746-900 CP4, CP5, CP6, or CP7 Tripped
Symptom Explanation
Conditions That Could Cause This Symptom
CP4, CP5, CP6, or CP7 tripped
-48v missing
¹
Overload on -48v
¹
SPD2 or expansion board
¹
Any processor or coupler
An overload is mainly due to a board or cabling
malfunction. All the processor cassettes or CS
DC/DCs are protected by an individual fuse. The
fuse is located inside of each of those elements
and prevents a general -48v overload. These
fuses are non-replaceable.
Locate the tripping CP and its corresponding
circuit in Figure 2-5 on page 2-16.
Notes:
1. CP4 and CP5 are used for expansion enclo-
sure 1.
2. CP6 and CP7 are used for expansion enclo-
sure 2.
001
Is CP4 and/or CP5 tripped?
Yes No
002
Go to Step 006.
003
CP4 and/or CP5 are tripped
Unplug the DCDP connector J3 and reset CP4
and/or CP5.
Is CP4 and/or CP5 tripping again ?
Yes No
004
Go to Step 009.
005
Go to Step 008
006
CP6 and/or CP7 are tripped
Unplug the DCDP connector J2 and reset CP6
and/or CP7.
Is CP6 and/or CP7 tripping again ?
Yes No
007
Go to Step 009.
008
Exchange the DCDP box. Go to “3746-900 Main-
tenance Using a FRU list” on page 1-28.
009
The overload is on the expansion board or in its
SPD2 cassette.
Pull the corresponding SPD2 cassette out and
reset the CP(s).
Is/are the CP(s) tripping again ?
Yes No
010
The problem is on the board distribution.
Reseat the SPD2 cassette
Unplug all the processors and couplers con-
nected on the board and reset the CP(s).
Is/are the CP(s) tripping again ?
Yes No
011
Reinstall all the processors and cou-
plers one at a time until the failing
part is isolated.
012
The expansion board is failing. Exchange it.
Go to “3746-900 Maintenance Using a FRU
list” on page 1-28.
013
¹
If CP4 and/or CP5 are tripped, the problem is
in the cable between the DCDP connector J3
and the SPD2 cassette connector J5 or SPD2
cassette. Check with a meter on the test
points.
¹
If CP6 and/or CP7 are tripped, the problem is
in the cable between the DCDP connector J2
and the SPD2 cassette connector J5 or SPD2
cassette. Check with a meter on the test
points.
Chapter 2. MAPs for FRU Isolation
2-19
Содержание FlashSystem 900
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