System Or Expansion Unit Cannot Become Powered Off - IBM i 830 Repair Manual

Power Problems
68. Perform the following:
69. Exchange the AC module or SPCN card (TWRCARD) from which you

System or Expansion Unit Cannot Become Powered Off

This procedure analyzes a failure of the normal command and control panel
procedures to power off the system unit or a secondary frame.
Attention: To prevent loss of data, ask the customer to verify that no interactive
jobs are running before you perform this procedure.
1. Is the power-off problem on a secondary frame with Stage 2 hardware?
56
iSeries Model 830, 840, SB2, and SB3 Problem Analysis, Repair and Parts V5R1
v AC module or SPCN card (TWRCARD) in the failing frame or unit.
v AC module or SPCN card (BKSPCN or TWRCARD) in the
preceding frame in the frame string.
v SPCN frame-to-frame cable.
This ends the procedure.
a. Follow the SPCN frame-to-frame cable back to the preceding frame in the
string.
b. Disconnect the SPCN cable from J16 on the AC module or SPCN card.
c. Connect the negative lead of a multimeter to the system frame ground.
d. Connect the positive lead of a multimeter to pin 2 of J16 on the AC
module or SPCN card.
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 J16 on the AC module
or SPCN card.
g. Note the voltage reading on pin 3.
5 4 3 2 1
9 8 7 6
RV2A179-1
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
you are working on.
v SPCN frame-to-frame cable
v AC module or SPCN card (TWRCARD) in the failing frame or unit
v AC module or SPCN card (TWRCARD) in the preceding frame of
the frame string
This ends the procedure.
disconnected the SPCN cable in step 68 of this procedure. 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 or unit you are
working on.
This ends the procedure.