Test 1: Error Log - IBM 3279 2A Maintenance Information

2.6.3 Test 1: Error Log
Online Test 1 allows the error log for any device
attached to the control unit to be inspected. It may
be useful to reset the error using Online Test 4
before testing, but note the contents of the log
before doing this.
TQ run Test I, see section 2.6.1.
2.6.3.1 Oaline Test 1 DIsplay: 3274 Control UDit
or
mBA
pp/1
05XX
XXXX
XXXX
XXXX XXXX
Figure 2-5. Test 1 Pattern
The most recent 32 79 display error code appears in
the first two digits on line 2. This code is prefixed
by '2' when it appears in the operator information
area.
For example, an error code of 205 ()(
~
205)
is logged as '05'.
3274 error codes for the 3279 display are listed in
Figure 2-8.
3279 MIM
2.6.3.2. OnIIoe Test 1 Display: 3276 Control Unit
The pattern shown below is displayed. This is
different from the 3274 because ALL errors are
recorded and a count is kept.
Note that the 3276 error code is the same as that
displayed in the OIA. For example: )(
~
42 is
logged as 42.
••• yy •••
XO Xl X2 X3 X4 X5
OX
xx xx xx
IX
xx
2X xx
3X
xx xx
4X
03
5X
6X
7X
8X
9X
The above example shows that error code 42
(keyboard overrun) has occurred 3 times. For error
code interpretation, see Figure 2-9.
Chapter 2. Maintenance Aids 2-9