Datamax ST-3210 Operator's Manual page 61

If experiencing this problem...
After printing the ticket, the
Fault Indicator lights:
The printer feeds when no ticket
stock is present or :
The printer feeds approximately
20 inches (51 cm) of ticket stock
then the Fault Indicator lights:
Tickets sometimes jam and/or
the printing is not square to the
ticket borders:
S-Class
Try this Corrective Action...
If cutter equipped, this may indicate a
cutter fault; call for service.
If not cutter equipped:
a) Possible programming problem.
b) Possible mechanical problem – try
pressing the FEED button to clear
the fault: if no response, call for
service. Otherwise, the positioning
of the Media Sensor may need an
adjustment (see Section 4.0).
The Ticket Detect Sensor may be
obstructed; clean the sensor per Section
4.4.4.
The position of the Media Sensor may
need adjusting; see Section 4.0.
The Media Sensor may be obstructed;
clean the sensor, see Section 4.4.3.
The TOF Mark on the ticket stock may
not meet specifications; see Section 6.
Ticket stock may be mounted upside
down; reinstall correctly, see Section
3.2.
The printhead may not be latched; see
Section 4.4.1.
The Media Guides may be incorrectly
positioned; see Section 3.2.
If cutter equipped, the cutter may be
malfunctioning; call for service.
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