IBM 3270 Maintenance Manual page 149

The same 64/256KB Memory Expansion Option
still has a failing module. With this type of
failure, the first character does not correctly
identify the failing bank. However the sixth and
seventh characters do correctly identify the
failing module.
1.
Replace the module in one of the banks that
has not yet had a module replaced.
2. Rerun the diagnostics (see page 3-200-55), then
return to this page and answer the question
below.
Sixth and Seventh
Characters of Error Code .......... 00 01 02 04 08 10 20 40 80
Bit (module) ................................
P O l 2 3 4 5
& 7
BankO
Top
B B 8iB B 8 0 0 B B B S:
0
1 I
Front
1---: - - - - - - -
- - - - I
r.
o 0 8lB 8 ~ 0 0 8 B 8 BID
1---------------1
0
o
B BiB B S 0 B B 0 B BJ
I
1
Bank 3
Bank 2
'DID THE DIAGNOSTICS RUN
SUCCESSFULL Y?
YES Your system is functioning properly.
NO
3-200-24 Maintenance Information
Bank 1