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Controller Card Tests
Diagnostic Test 70 (Control Panel Lights)
Diagnostic test 70 turns on all the control panel lights and the display. Beginning
with the upper-left corner, each light is turned on, in order, from left to right and top
to bottom on the control panel. The display is turned on in seven parts. Note any
lights that do not go on in this order. The test will indicate PASS 70 even if some of
the lights do not go on. If this test is put into a loop, the lights will show the status of
the tape unit each time the test is completed.
Diagnostic Test 71 (Front Panel Buttons)
Diagnostic test 71 displays the name of each button as it is pushed. DIAG, CANCEL,
UNLOAD, ONLINE, REWIND, and ENTER are displayed when the Diagnostic mode,
Cancel, Unload/Rewind, Online, Rewind and Enter buttons are pressed. UP and
DOWN are displayed when the Diagnostic Select button is pressed on the top and on
the bottom. Any differences occurring in this procedure should be noted. The test
will indicate PASS 71 when the Cancel button is quickly pressed two times.
Diagnostic Test 72 (Front Panel Message Check)
This is an interactive test.
This test displays all the front panel messages.
The front panel buttons are defined as follows for the test:
Diagnostic Select Switch
Selects the next or previous message to be displayed, cycling through
all the messages.
Online
Resets the message pointer back to the first message.
Cancel
Stops the test.
Diagnostic Test 75 (tape lifter
Dl
Test)
A scratch tape is needed for this test.
Performs a writehead test with the tape lifter (TL) engaging and disengaging to
verify correct TL operation.
First, the beginning of the tape is erased. Then write operations are done to the
tape while engaging and disengaging the TL at successively shorter intervals. The
tape is then rewound and the dropouts are counted as the tape is read.
If the test shows two or less interruptions on the tape, it gives an Inoperative error.
If 15 to 21 interruptions are sensed, it reports a Slightly Low error. If 22 t o 25 inter-
ruptions are sensed, a PASS condition is reported.
The response time of the TL is being tested. It is possible for the TL to intermittently
bind and this condition is not detected by this test.
Diagnostic Test 76 (Digital-teAnalog Converters [DAC] Test)
The tape must be unloaded for this test.
Appendix B. Diagnostic Tests
B-9 1
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