IBM iSeries 820 Hardware Problem Analysis And Isolation

(A) SPCN
Optical .----- (C) SPCN
Adapter ----. | Optical Cables
| |
| | .--- (B) SPCN
.---------. | | | Optical
| System | | | | Adapter
| Unit | V | V
| J15 | .-. V .-.
’----.----’ | +------------+ |
| | +------------+ |
.----’----. .-------’-+ .-------’-+ .---------.
| J15 | | J16| | J15| | |
|Frame J16+-+J15 Frame| |Frame J16+-+J15 Frame|
| 1 | | 2 | | 3 | | 4 |
’---------’ ’---------’ ’---------’ ’---------’
^
|
|
’---Failing Frame
This ends the procedure.
48. Does the SPCN frame-to-frame cable coming from the system unit connect to J15 on the secondary
frame (where the power on light is off or the frame control panel displays a power reference code of
1xxx xxxx)?
v Yes: Continue with the next step.
v No: Connect the SPCN frame-to-frame cable coming from the system unit to J15 of the secondary
frame.
This
ends the procedure.
49.
Perform the following:
a. Power off the system.
b. Disconnect the SPCN frame-to-frame cable from J15 on the AC module or SPCN card of the first
frame or unit that cannot become powered on.
c. Connect the negative lead of a multimeter to the system frame ground.
d. Connect the positive lead of the multimeter to pin 2 of the SPCN cable.
Note: Use an insulated probe or jumper when performing the voltage readings.
e. Note the voltage reading on pin 2.
f. Move the positive lead of the multimeter to pin 3 of the SPCN cable.
g. Note the voltage reading on pin 3.
Is the voltage on both pin 2 and pin 3 from 1.5 V dc to 5.5 V dc?
v No: Continue with the next step.
v Yes: Exchange the following FRUs, one at a time. See the Remove and replace procedures topic,
or the Migrated Expansion Tower Problem Analysis, Repair and Parts manual on the V5R1
Supplemental Manuals web site , depending on the secondary frame you are working on.
– AC module or SPCN card (see symbolic FRU “TWRCARD” on page 470) in the failing frame or
unit.
– AC module or SPCN card (see symbolic FRU “BKSPCN” on page 286 or see symbolic FRU
“TWRCARD” on page 470) in the preceding frame in the frame string.
Analyze hardware problems 55

IBM iSeries 820 Specifications

General

Brand	IBM
Model	iSeries 820
Category	Server
Language	English