IBM i 830, Repair Manual

Page: 69 / 1000

v
SPCN optical cables C between the preceding frame in the string and the
failing frame.
(A) SPCN
Optical ┌───── (C) SPCN
Adapter ────┐ │ Optical Cables
│ │
│ │ ┌─── (B) SPCN
┌─────────┐ │ │ │ Optical
│ System │ │ │ │ Adapter
│ Unit │ : │ :
│ J15 │ ┌─┐ : ┌─┐
└────┬────┘ │ ├────────────┤ │
│ │ ├────────────┤ │
┌────┴────┐ ┌───────┴─┤ ┌───────┴─┤ ┌─────────┐
│ J15 │ │ J16│ │ J15│ │ │
│Frame J16├─┤J15 Frame│ │Frame J16├─┤J15 Frame│
│ 1 │ │ 2 │ │ 3 │ │ 4 │
└─────────┘ └─────────┘ └─────────┘ └─────────┘
G
│
│
└───Failing Frame
This ends the procedure.
66. 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)?
Yes No
↓
Correct the connection by connecting the SPCN frame-to-frame cable
coming from the system unit to J15 of the secondary frame.
This ends the procedure.
67. 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.
1 2 3 4 5
6 7 8 9
RV2A180-1
Is the voltage on both pin 2 and pin 3 from 1.5 V DC to 5.5 V DC?
No Yes
↓
Exchange the following FRUs, one at a time. See the removal and
installation procedures in this book or in the
Migrated Expansion Tower
Problem Analysis, Repair and Parts , depending on the secondary frame
that you are working on.
Power Problems
Chapter 1. Starting Problem Analysis
55