IBM 3270 Maintenance Manual page 166

2.
Rerun the diagnostics (see page
3-200-55).
If you receive the same error code,*
replace another nine modules from a
different bank and run the diagnostics
again (see page
3-200-55).
Repeat this
process until either the problem* is solved
or all the modules on the system board
have been replaced.
If you receive the same error code* after
all four banks have been changed:
a. Replace the system board.
b. Remove all the 64K modules from the
old system board and install them on
the new system board. See Section
5,
"Removal/Replacement and
Adjustments."
c. Rerun the diagnostics (see page
3-200-55).
*
Note:
If you receive a new error code at any
time during the above procedure, go to page
3-200-1
and follow the
PIC
again.
October
1984 3-200-41