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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