IBM 3270 Maintenance Manual page 135

There is a failing module on the system board.
The first character of the error code indicates
which bank has the failing module. The sixth
and seventh characters of the seven character
error code indicate which bit (module) of the
bank failed (P, 0, 1, 2, 3, 4, 5, 6, or 7). For
example, error code 3COOO 40 201 corresponds to
the failing module indicated by the arrow in
bank 3, bit 6.
Replace the failing 64K module. See Section 5,
"Removal/Replacement and Adjustments."
First Chlrlcter of
Error Code ............................................. 0 1 2 3
Blnk ...................................................... Blnk 0 Blnk 1 Blnk 2 Blnk 3
Sixth Ind Seventh
Chlrlclen of Error Code ..•.........
00 01 02 04 08 10 20 40 80
Bit (moduleL................................ P 0 1 2 3 4 5 8 7
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Front
•
CONTINUE
3-200-10 Maintenance Information