IBM V03 Maintenance Information page 189

Tractor drive gear in the idle position (not engaged)
7. Turn on the printer.
The drive gear should move left (idle position).
8. Select the front tractor path at the operator panel if READY
Front is not displayed by pressing the Stop and the
Park/Path keys.
9. Press Load/Eject.
The drive gear should move right (drive position).
10. If the front tractor drive gear fails to smoothly move in both
directions, exchange the following FRUs one at a time. Test
each FRU. If the problem remains, reinstall the original FRU
and continue.
a. Front tractor asm.
b. Logic board
c. Tractor cable asm.
Chapter 5. Removals, service checks and adjustments
189