3745 MAPs
Chapter 2. Map for FRU Isolation

IOC Bus MAPs

MAP 0100: IOC Bus Trouble Shooting

Symptom Explanation Conditions That Could Cause This Symptom
IOC bus error detected but not
fixed by diagnostics or autoBER. PUC
TERMI
TERMC
TERMR
LAs ( TRM/CSP/CSC )
CAL
Basic board
If you have an intermittent problem, consider that
any of the conditions given in the above table can
cause the problem.
001
Are the FRUs: PUC, TERMI, TREMC, or TERMR
indicated by the diagnostics or reference
code?
Yes No
002
The problem origin can be the channel
adapter or line adapter
Power the 3745 OFF as follows:
Put the power control in local mode:
Using Power Control, scroll till
the value is 3.
Press Validate.
Press Power Off.
Remove all line adapters
Press Power On Reset.
Run the channel adapter diagnostics
Are they running error free?
Yes No
003
Go to Step 008.
004
One line adapter may be failing. Go to Step
017 on page 2-2.
005
Press Power Off.
(Step 005 continues)
005 (continued)
Change the TERMI and/or PUC accordingly.
See “Card Exchange Procedure” on page 4-34.
And/or “TERMD/TERMI Exchange Procedure”
on page 4-62.
Change the TERMC and/or TERMR accord-
ingly. See “TERMC/TERMR Exchange
Procedure” on page 4-61.
Press Power On Reset.
Run the diagnostics.
Are they running error free?
Yes No
006
Go to Step 002.
007
Go to “CE Leaving Procedure” on page 4-102.
008
Press Power Off.
Replug all line adapters.
Unplug all channel adapters.
Press Power On Reset.
Run the line adapter diagnostics.
Are they running error free?
Yes No
009
Change the basic board. Go to “Exchange
Precautions” on page 4-1.
010
(Step 010 continues)
Copyright IBM Corp. 1989, 1997 2-1