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Users Manual Model 656/636 Electrical Trouble Shooting • 49
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Problem Probable Cause Corrective Action
Machine advances stock but does not
print.
1) Stock registration sensor miss
aligned.
1) Adjust sensor position so that the
sensor light on the front panel
flashes as a sense slot or hole
passes under the sensor.
2) Miss adjusted print head position. 2) Set print head position. Refer to
"Print Head Tangent Point".
3) Miss adjusted print head pressure. 3) Set print head pressure. Refer to
"Print Head Pressure Setting".
4) Print head cable unconnected or
faulty.
4) Power off the machine and
reinsert the offending connector
or replace cable.
5) Print head faulty. 5) Replace print head.
6) Head Driver Board unplugged or
faulty.
6) Check Head Driver Board / AT
board connection and or replace
Head Driver Board.
Machine stops after ever third label. 1) Stock registration sensor miss
aligned.
1) Adjust sensor position so that the
sensor light on the front panel
flashes as a sense slot or hole
passes under the sensor.
2) Stock registration sensor
uncalibrated.
2) Using TP13 and R51 on the
Thermal Control Board re
calibrate the sensor. Refer to
"Sensor Trim Pots".
Print registration is off in the feed
direction.
1) Feed pressure setting is off. 1) Set feed pressure. Refer to
"Mechanical Adjustment Of Feed
Roller Pressure".
2) Print position is incorrect. 2) Enter the setup menu and readjust
the print setting as needed.
3) Field(s) position incorrect in the
format.
3) Using formatter check and
readjust the field(s) position(s) as
needed.
4) Bound platen roller. 4) Check that the platen roller turns
freely on it's shaft. If it does not
replace it.