Map Diagnostic Integration (Mol) Tests - IBM 5280 Technical Newsletter

961
MAP DIAGNOSTIC INTEGRATION (MOl) TESTS
(continued)
MDI2540 51TD Head Resolution Test - writes a
repeated pattern of hexadecimal
F F F F F F F F AA AA AA AA on
track 76. The test then goes into a
continuous read loop. You can scope this
data to determine head resolution. Head
resolution is the ratio of the signal
amplitude of hexadecimal FF to the
signal amplitude of hexadecimal AA.
If the head resolution is more than 0.5,
the head is probably good. If the head
/resolution is less than 0.4, the head is bad.
When the head resolution is between
0.4 and 0.5, use the system error log
report program (TSYSEREP) data to
determine if the head is bad.
The head is bad if the TSYSE R EP data
indicates data failures on cylinders 64
through 76 and the head resolution is
less than 0;5.
See 965 to check the head resolution.
961
Communication Area (MDI3001)
Page of S Y31.oo00-1
As updated Apri I 15, 1981
By TNL SN20-9588
MDI3010 Communications Setup Test - specifies
the type of communications installed on
the system and the initialization of the
communications control block (CCB)
interface. You can select one of the
following features and perform the
communications test and wrap functions
for that feature:
• EIA feature
• DDSA feature
• 38LS feature
If an encoding device is used, ensure that
either the mode switch is in nonencode
mode or the device is removed from the
line before running the wrap test.
Printer Area (MDI7001)
MDI7010 Twinaxial printer attachment MPU Test - checks
the twinaxial printer attachment MPU and the
twinaxial printer adapter for a minimum print
function and verifies the data transmitted to the
printer. The following tests are run:
• Adapter wrap test
• Line quality test
• Minimum print operation/communications
verification
For printer failures, see the maintenance
document supplied with the printer.
Map Diagnostic Integration (MOl) Tests 189