Printronix P4280 - Ribbon Stall

3–14 Troubleshooting
Ribbon Stall
Instruction Indication Yes No
1. Check that forms thickness
lever is not closed too tightly;
this can jam the ribbon and
shuttle.
Forms thickness lever is set
correctly.
Step 2. Readjust the
setting of the
forms thickness
lever. Go to step
2.
2. Run a diagnostic self–test
(page 3–27) and check for
shuttle obstruction.
“Ribbon Stall” message. Step 3. Return printer to
normal operation.
3. Check ribbon path for
blockage or obstruction.
Ribbon path is clear Step 5. Remove
obstructions from
ribbon path and
go to step 5.
4. Wind ribbon by hand and
inspect for folds, tears, holes,
fraying.
Ribbon is OK. (Folds are
permitted, if the ribbon is
otherwise undamaged.)
Rewind and
reinstall ribbon.
Go to step 6.
Replace ribbon, if
damaged. Unfold
and rewind ribbon
if it was folded. Go
to step 6.
5. Do a fast shuttle self–test
(page 3–27) and check the
alignment of the ribbon
guides and hubs if the ribbon
was folded.
Ribbon tracks OK. Step 6. Align ribbon
guides (page
4–18). Go to step
6.
6. Using a screwdriver, short
across the ribbon guide
screws to reverse ribbon hub
motion. Check for a ribbon
drive motor that will not wind
ribbon.
Both motors wind the ribbon. Replace the
mechanism driver
PCBA (page
5–48).
Replace the
defective ribbon
drive motor (page
5–36).