IBM 6360 Product Support Manual page 203

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G
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displayed, the opposite drive
will be selected. Any drive test
selected after this function is
run will be executed from the
last selected drive.
Execute BAT Once. This causes
the BAT to run once from the
start of the test. At the end of
this test the processor will pass
system control to the IPL func-
tion, if the test is acceptable.
Execute BAT In Loop Mode. The
BAT will run continuously in the
loop mode until an error is found
or the ~lemory Record Button is
pressed. It is only possible to
exit this mode at a specific time
during the test. This period of
time is known as the exit window.
The exit window can be recognized
by a distinct LED pattern (1110)
which will be displayed contin-
uously during the exit window.
When BAT is run from the RNA con-
troller, the system control goes
to The exit window occurs during
the RAM part of the BAT and is
four to five seconds long. Dur-
ing this period the Memory Record
Button must be pressed and
released. When the test is ter-
minated this way, the processor
will return system control to the
RNA controller. The test will
not stop immediately, because it
must complete the BAT sequence.
the BAT controller. Because of
this, the RNA display will disap-
pear, and the interface with BAT
will be through the normal BAT
display format.
Run Diskette Drive Set Ready
Test. The Diagnostic Diskette
must be loaded in the selected
drive before running this test.
This test performs in the follow-
ing sequence:
1. PORs the Diskette Adapter
Cards
M
N
2. Samples the Diskette Index
Pulse
3. Checks the Drive Set Ready
Signal
4. Engages the Read/Write Head
5. Checks the Write/Erase Enable
Line (This ensures the system
will not write on the custom-
er's diskette.)
6. Reads the Track ID
7. Disengages the Head.
The system will return to RNA
controller and wait for the next
test selection at the end of this
test.
Diskette Stepper Motor Phase
Test. The Diagnostic Diskette
must be loaded in the selected
drive before running this test.
This test determines if the
diskette stepper motor is operat-
ing correct ly . When an error
occurs during this test, the last
correct track ID that was read
will be displayed in the test
feedback field. The Write/Erase
Enable line is checked to ensure
a write unsafe condition is not
present. This ensures the system
will not write on the customer's
diskette by accident. The system
will return to RNA controller at
the end of this test.
Diskette Drive Alignment Aid.
The diskette must be removed from
the diskette drive before start-
ing this test. This test is used
with an adjustment procedure to
ensure the read/write head is
correctly aligned. The adjust-
ment procedure is described in
the Diskette Drive section of
this manual. When the ENTER key
is pressed, the head is posi-
tioned to track 40. When this
test is running, pressing the
spacebar will cause the
read/write head to step between
tracks 39 and 40. Pressing the
END key will end this test. The
system will return to RNA con-
Chapter 9. Diagnostics 9-11