IBM FlashSystem 900, Service Manual

Page: 267 / 546

3746-900 MAPs
004 (continued)
Are all voltages correct as indicated ?
Yes No
005
Exchange the DCDP. Go to
“3746-900 Maintenance Using a FRU
list” on page 1-28.
006
Go to Step 036.
007
The power ON sequence is controlled by the
3746-900.
Is the 3746-900's power sequence initiated by
a host connected to the 3746-900?
Yes No
008
The 3746-900's power sequence is con-
trolled by the service processor.
– Check on the Test 1 connector pin 31 if
'PWRHOLDCMD' line is at +5v. Refer to
YZ page 234 for test 1 pin assignment.
Is + 5v present on pin 31?
Yes No
009
– Check that the cable is correctly
plugged into the J8 connector on
SPD1 and into the J7 connector on
DCDP.
Is plugging correct?
Yes No
010
Plug the cable correctly and
restart the operation.
011
First exchange the SPS. Then if the
problem persits, exchange the SPD1.
Go to “3746-900 Maintenance Using a
FRU list” on page 1-28 for FRU
exchange.
012
– On the Test 2 connector on the DCDP,
check:
Pin 1 '3745 Presence' line. Must be ground
Pin 2 '3745 ON normal open' line.
Must be at +5v.
Pin 4 '3745 ON common' line.
Must be at +5v.
5 4 3 2 1
9 8 7 6
Test 2 Pin Assignment
Are all voltages correct as indicated?
Yes No
013
Check 3745 K3 or cable.
Chapter 2. MAPs for FRU Isolation
2-9