IBM 4247 Maintenance Information page 224

10. The test completed successfully if the display advances to the next test number.
T&D21 - Paper Path Sensor Test
This test routine was added to the Test and Diagnostics beginning with the following microcode release levels:
v Model 001 coax, controller code release level 3.06
v Model 001 twinax, controller code release level 3.04
v Model 002, either attachment, controller code release level 2.04
T&D21 provides information on the operation of the front fanfold presence sensor, rear fanfold presence sensor,
and manual cutsheet presence sensor. Use the test to verify correct sensor operation.
Verify sensor operation by inserting and removing a form from a forms path, and checking for correct changes in
the display status given in step 5.
1. Display:
T&D21 Sensor Test RUN TEST ? YES END NO
2. Press the Line Feed key. The printer displays the following, which gives you the option of performing a
sensor tune at this time:
T&D21 Sensor Test SENSOR TUNE ? YES ... NO
3. To perform a sensor tune, press the Line Feed key. If this is selected, follow the steps in T&D11 Return to
here after the sensors are tuned.
Press the Start key to skip to step 4 without performing a Sensor Tune.
4. The following displays:
T&D21 Sensor Test PATH STATUS ? YES ... NO
5. Press the Line Feed key to display sensor status.
Press the Start key to skip to step 6 on page 225.
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Chapter 2. Diagnostics