IBM 4247 Maintenance Information page 105

Table 15. MAP 0190: Forms Feed Problems (continued)
Step Questions/Actions
Look closely at the tractor sensor in dim light. There is a
5.
small red LED visible in the sensor surface, over which
the forms pass. You may need to cup your hand around
the sensor to be able to see the LED. This LED lights if
the tractor is correctly plugged in and the electrical
circuits are OK.
Is the red LED lighted?
Yes
Install a new logic board
Run T&D in automatic test mode
to verify correct printer operation.
For Model A00, see "How To Run
the Test and Diagnostic (T&D)
Programs" on page 161. For
Models 001, 002, or 003, see
"How To Run the Test and
Diagnostic (T&D) Programs" on
page 201.
No
Remove and re-install the tractor
assembly, making sure that the
electrical connector tab is fully
seated in the connector. Check if
the red LED is now lighted. If the
red LED is still not lighted, check
that the small flat ribbon cable in
the tractor is fully connected to
the tractor motor. Check if the
red LED is now lighted. If the red
LED is still not lighted, install a
new tractor assembly cable.
Check if the red LED is now
lighted. Replace the tractor
assembly and check if the red
LED is now lighted. If the red
LED is still not lighted, install a
new tractor assembly cable.
Check if the red LED is now
lighted. If the red LED is still not
lighted, install a new logic board.
Run T&D in automatic test mode
to verify correct printer operation.
For Model A00, see "How To Run
the Test and Diagnostic (T&D)
Programs" on page 161. For
Models 001, 002, or 003, see
"How To Run the Test and
Diagnostic (T&D) Programs" on
page 201.
Chapter 1. Diagnosing Problems
105