Xerox 4090 - Manual (Page 121)

SOLVING PROBLEMS
5. Press the Test switch. The diagnostic indicator illuminates,
and the display indicates 01.
6. Press the Execute switch. Test 01 starts with the display
panel stepping through the number pairs from 00, 11, 22, 33,
through 99. Make sure that these numbers appear correctly
and in sequence. Also, make sure that all indicators except
Logic Off, BOT, and High Density are lit.
Test 01 continues with various tape motion and read/write
exercises for approximately 10 minutes if a 10.5 inch reel
(2400 feet/731.5 meters) is used.
If the test runs to completion, it was successful. The transport
performs a rewind/unload operation. The digital display indicates
00 and the Reset indicator illuminates. This does not mean that
the problem is resolved, only that some of the possible causes
have been eliminated by the diagnostic program. When placing
the service call, make sure to indicate whether or not Diagnostic
Test 01 was successful.
If the test does not run to completion when it stops and a
numerical fault code appears in the display window, refer to the
operator-correctable actions list inside the door of the tape drive
unit (lower half of the list) and follow those directions. Reinitiate
Test 01 to see if it can run to completion. If not, report any and
all numbers when placing the service call.
Additional diagnostic tests
Your service representative may ask you to perform the
additional diagnostic tests 02 and 03.
Diagnostic Test 02
In some cases, your service representative may ask you to
perform Diagnostic Test 02 to check tape tension. Never
attempt to perform this test, except when directed to do so by a
service representative.
Follow these steps if directed to perform Diagnostic Test 02:
1. Make sure that the transport is powered on. Thread a
scratch tape but do not load it. Close and latch the door.
2. First press the Reset switch, then the test switch. The
diagnostics indicator should be lit, and 01 should appear in
the display window.
3. Press the Step switch one time. The numerical display steps
from 01 to 02. If you press it too many times, press the
Reset switch and repeat this step.
4. Press the Execute switch. Test 02 starts and runs for less
than 30 seconds.
If 00 displays at the completion of the test, it was successful. If
the test was unsuccessful, the diagnostic program halts, the Reset
indicator lights, and a numerical fault code appears on the
display. Record this number and report it when placing the
service call.
XEROX 4050/4090/4450/4650 LPS OPERATOR GUIDE 8-3