IBM V03 Maintenance Information page 120

If the front tractor is not installed, the current path status displays:
T&D15 Sensor Test Front: x PRESS A KEY
where:
v Front: is status of the rear (base) fanfold sensor
v x will be B or F to indicate PATH BLOCKED or PATH FREE
The display is continuously updated to indicate sensor status changes. Inserting paper into a path changes
the display from :F (free) to :B (blocked).
Press any key to go to step 6.
6. The following displays:
T&D15 Sensor Test THRESHOLD ? YES ... NO
This part of the test is intended for use by Product Engineering, and allows the user to examine internal
sensor threshold values stored in NVRAM.
7. Press the Start key to skip to step 8 on page 121.
Press the Line Feed key to enter. Threshold values written in NVRAM display. If the front tractor is installed,
threshold values written in NVRAM display.)
T&D21 Sensor Test Rear: x1 Front: x2
where:
v x1 is the threshold for the rear (base) path
v x2 is the threshold for the front (second or optional) path
v x1, x2 are numbers in hexadecimal format, which correspond to the measured voltages, resolution of 20
mV.
120
Chapter 2. Diagnostics